Perfect 19" + Offset?

[InfiniteGSX]

Yes I know search... but I did and couldn't find anything exactly in particular.

I had some pm's a while back from someone in Arizona that had a gorgeous setup...

I was going to go with 20's but decided on 19's for the reason of shoving a tad taller tire in there because of how horrible NM roads are.

But I want to try and grab the best lip possible...

So from everything, what is the results? 19x7.5"? 19x8", or 19x9"? And with that said, what about offsets? I don't want the wheels to budge outside of the fenders like some wheels do...

 

[wret]

Wheel diameter, and to a certain extent width, don't affect tread width. Tread width and and overal tire diameter are what determine fit. +40mm offset is still the best recommendation for anything going on a 2g DSM with wheels that will tuck.

 

[gixrman]

i have ADR 19" with 35 offset and 215/35/R19's on them now will be stuffing 245/40 on them to see if they fit in the wheel well. there only slightly taller.

 

[DSMSpyder99]

i have ADR 19" with 35 offset and 215/35/R19's on them now will be stuffing 245/40 on them to see if they fit in the wheel well. there only slightly taller.

whoever told you it will only be "SLIGHTLY TALLER" is wrong. A 215/35/19 has an overall diameter of 24.9"; a 245/40/19 has an overall diameter of 26.7". That is almost a 2" difference in tire size.

 

[InfiniteGSX]

wret, No I'm not talking about tire width... I'm talking about the tallness of the tire itself. Like a 235/35/20.. its a 35 series... Thats like a flippin rubber band... its too small here in NM... Not like I would love to run it... but I am just too cheap to buy new wheels if I damage them. So instead, I want to run a 19" wheel with like a 40 or a 45 series tire.

And at the same time, I'm trying to find out whats the best wheel width for a 19" wheel, and offset, to fit these suckers on the car without the wheels sticking out of the fender, and while giving it a pretty nice lip. I have about 2 weeks to figure out the exact size wheel I'm going with, and also gotta figure out the exact tire size I'm going with, so I can order in about 2 weeks.

 

[InfiniteGSX]

Ok, maybe I can help myself out... but I still want help from you guys. What is the exact stock size of the GS/GST wheels, and offset?

And offset is measured as the distance from the center of the wheel, to the mounting face of the wheel, correct?

 

[Flash]

19x8.5 +40 would be an optimal size, you may be able to squeeze a few mm offset lower but you will need to roll the fenders. Stretch a 225/35/19 tire over it too and you should be set.

 

[InfiniteGSX]

Grant, I am trying to go with a thick tire and a 19" wheel... For the reason that, the streets in NM are very crapy... so I was thinking of like a 40-45... just to have more room to play with bumps n stuff... ya know...

But your saying with a 8.5" wide wheel... I could probably hit a 35mm offset with some rolling of the fenders...

So maybe with an 8" wheel instead, I could do the same, and fit a taller tire.

 

[DSMSpyder99]

GS/GST came with a 205/55/16 on a 16x6 rim 46mm offset. Remember that the 40 or 35 series does not mean your tire will have more/less sidewall. It is an ASPECT RATIO of how wide the tire is. For example:

a 215/45/17 has less side wall than a 255/40/17. Making the 255/40/17 is a taller tire.

a 225/45/17 has the same amount of sidewall of a 255/40/17. Thus both have the same overall diameter.

 

[InfiniteGSX]

What? I think your a tad confused DSMSpyder. 45 or 50 series tire does have more sidewall then a 35 or 40 series, period. No matter how wide or how skinny the overall width of the tire is. Even if the tire width is soo small that the tire actually rides on the sidewall. Sidewall is sidewall, the area with the letters on the tire, that tells you what kind of tire, how much pressure and all of the warnings and legal info. So, I could have a 255/45 tire and it will have the same sidewall as a 195/45. The only difference, is the contact surface of the tire itself, the width would be 60mm less on the 195, and might actually ride on the widewal, especially under low tire pressure.

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Width x Aspect Ratio = Section Height
Section Height x 2 = Combined Section Height
Combined Section Height + Wheel Diameter = Tire Diameter

Example: 185/60R14 85H or 185/60HR14

185mm x .60=111mm
111mm x 2=222mm
222mm + 355.6mm(14")= 577.6mm or 22.74"

The first number is the width of the tire in millimeters, measured from sidewall to sidewall. To convert to inches, divide by 25.4 In the example above, the width is 185mm or 7.28".

The second number is the aspect ratio. This is a ratio of sidewall height to width. In the example above, the tire is 7.28" wide, multiply that by the aspect ratio to find the height of one sidewall. In this case, 185x0.60=111mm or 7.28"x0.60=4.36".

The last number is the diameter of the wheel in inches.

To figure the outside diameter of a tire, take the sidewall height and multiply by 2,(remember that the diameter is made up of 2 sidewalls, the one above the wheel, and the one below the wheel) and add the diameter of the wheel to get your answer.

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Here's a quickie. But you are right about the 255/40 being taller then a 205/45. Only because the tread width is soo small, most of the tire is riding on the sidewall... which is very unsafe in my opinion. A 255/45 is taller then a 255/40. Which is what I plan on doing. I know all about the tire stuff. Which is why I'm comming for advice on a perfect Wheel Width/Offset for a 19" Diameter Wheel.

 

[Flash]

The new Porsche Cayman S/ 911 Carrera come with a 235/35/19 tire on the front 2xx/35/19 on the rear. People daily drive those cars out here in Colorado, Germany, everywhere. I've driven many on shitty downtown Denver roads, and I never felt anything different. 35 sidewall should be more then enough for you. Unless you plan to do some extreme off-roading.

Also, you won't be able to stuff a wide tire on the wheels without having issues. I think 235 should be the MAX that can fit. Personally, I can only imagine a 225 working.

 

[InfiniteGSX]

Well people with a Porsche doesn't drive them much here in Albuquerque. There are tons of potholes. I've damaged my 17's before on 45 series tires! I damaged my 16's on 45 series tires before... but the city paid for it... Its almost as if you go offroad. I mean I could devote a few months to photograph all of the construction... There's a dip and a rise on a main street right now from construction that is about 2-3" tall! They wont leave the roads alone, they MUST tear them apart.

 

[DSMSpyder99]

What? I think your a tad confused DSMSpyder. 45 or 50 series tire does have more sidewall then a 35 or 40 series, period. No matter how wide or how skinny the overall width of the tire is. Even if the tire width is soo small that the tire actually rides on the sidewall. Sidewall is sidewall, the area with the letters on the tire, that tells you what kind of tire, how much pressure and all of the warnings and legal info. So, I could have a 255/45 tire and it will have the same sidewall as a 195/45. The only difference, is the contact surface of the tire itself, the width would be 60mm less on the 195, and might actually ride on the widewal, especially under low tire pressure.

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Width x Aspect Ratio = Section Height
Section Height x 2 = Combined Section Height
Combined Section Height + Wheel Diameter = Tire Diameter

Example: 185/60R14 85H or 185/60HR14

185mm x .60=111mm
111mm x 2=222mm.25
222mm + 355.6mm(14")= 577.6mm or 22.74"

The first number is the width of the tire in millimeters, measured from sidewall to sidewall. To convert to inches, divide by 25.4 In the example above, the width is 185mm or 7.28".

The second number is the aspect ratio. This is a ratio of sidewall height to width. In the example above, the tire is 7.28" wide, multiply that by the aspect ratio to find the height of one sidewall. In this case, 185x0.60=111mm or 7.28"x0.60=4.36".

The last number is the diameter of the wheel in inches.

To figure the outside diameter of a tire, take the sidewall height and multiply by 2,(remember that the diameter is made up of 2 sidewalls, the one above the wheel, and the one below the wheel) and add the diameter of the wheel to get your answer.

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Here's a quickie. But you are right about the 255/40 being taller then a 205/45. Only because the tread width is soo small, most of the tire is riding on the sidewall... which is very unsafe in my opinion. A 255/45 is taller then a 255/40. Which is what I plan on doing. I know all about the tire stuff. Which is why I'm comming for advice on a perfect Wheel Width/Offset for a 19" Diameter Wheel.

Your own post proves me right . I don't think you understand ASPECT RATIO.

45 or 50 series tire does have more sidewall then a 35 or 40 series, period.

275/40/17 = 275mm x .4 = 110mm
225/45/17 = 225mm x .45 = 101.25mm

The 40 series tire has a taller sidewall than the 45.



Daniel

 

[InfiniteGSX]

Ok. I'll just order a 255/35/19 instead of a 255/45/19, just so I can get a taller tire.

Back to the subject.

 

[wret]

Ok. I'll just order a 255/35/19 instead of a 255/45/19

Okay, if Jtoby shows up, I'm going to have to explain why I didn't move this thread to appearance. I think I can argue there is some technical merrit, although we have been through this material before. Here are some of the key points again.

1. It doesn't matter that we're talking about 19 inch tires, the fitment elements are the same. Wheel diameter and width do not determine fit. Offset and tread width are the limiting factors on a 2g dsm.
2. +40mm is the best wheel offset for a 2g DSM with wheels that tuck.
3. Offset becomes more of a concern as the tire tread width approaches the maximum, which is a 255 width tire.
4. Wheels are a support structure for the tire. Decide on the tire, then decide on the best wheel dimensions for the tire. The choice of tire size can limit the wheel selection and vise versa.

That said, I would not recommend 19 wheels to anyone driving a dsm on public roads but to each his own.

I would not recommend 255 series tires to anyone that does not fully understand the fitment issues and is prepared to make modifications or accept limitations to make them fit. Further, I do not believe all 255 width will fit due to variation in tread width between brands. If you want to play with 255's be prepared to accept that they won't fit. I personally would not even try to fit 255's on any other offset than +40mm.

 

[wret]

Ok. I'll just order a 255/35/19 instead of a 255/45/19, just so I can get a taller tire.

Back to the subject.

Please limit the sarcasm. It confuses the issue. Daniel is correct.

 

[InfiniteGSX]

Yes, he is correct, but again wrong because I never once mentioned width. A 45 sidewall no matter what you or anyone says, is a 45 sidewall, its taller then a 40 sidewall. The sidewall itself is taller. This is what I've been saying this entire time. Sidewall doesn't magically turn into tire tread if put on such a small tire that it ends up riding on the sidewall itself. A 255/45/19, no matter what, is taller then a 255/40/19. I don't give a rats ass about a 245/40/19 to make the tire taller.

Plus it was never mentioned. This thread wasn't supposed to be a huge debate on tire size. Its supposed to be on a perfect wheel Width/Offset.

Now you say +40mm. But on what size width? Because if your mentioning a 8" wide wheel... that +40mm offset will change on a 8.5 Wheel. Infact, if you were saying +40mm on a 8" wide tire, the equivalent to get the same outside lip, on a 8.5" wheel would be around +46mm. But then if done like that, you'd be shoving more of a wheel in the back and have to worry about rubbing the suspension.

 

[wret]

A 45 sidewall no matter what you or anyone says, is a 45 sidewall, its taller then a 40 sidewall. The sidewall itself is taller. This is what I've been saying this entire time.

And you're still not correct. Sidewall height is relative to treadwidth as Dan tried to explain. Wheel width does not affect offset requirement. A 225 width tire on a 7" wheel will fit the same as on an 8" wheel with the same offset.

Don't tell us we are wrong until you understand these concepts.

 

[InfiniteGSX]

And you're still not correct. Sidewall height is relative to treadwidth as Dan tried to explain. Wheel width does not affect offset requirement. A 225 width tire on a 7" wheel will fit the same as on an 8" wheel with the same offset.

Don't tell us we are wrong until you understand these concepts.

No offense, but I kinda do. And thats the only reason were arguing. Because you guys don't seem to get it. A 225 width tire on a 7" wheel is the same on a 8" wheel? How do you figure this? A 225 tire going from a 7" wheel, to an 8" wheel will shorten the overall diameter of the tire. Once again, FORGET THE TIRES! Please!

I really seriously hate asking simple freaking questions and then getting people arguing with me about crap I never asked. People always argue with me about tire sizes, and I seem to always show them up. And its kinda BS already. Nobody does any actual reading.

All I care, and give a crap about, weather you think I'm wrong or not about what tires I never once mentioned, is getting the perfect width wheel, with the perfect offset to put the wheels where I want them. I WILL DEAL WITH TIRES THEN!

But since these concepts, as you put it, are too difficult to come by, I'll ask somewhere else. Really starting to be very difficult to get minor help from DSM'rs... very strange.

 

[InfiniteGSX]

Yes I know search... but I did and couldn't find anything exactly in particular.

I had some pm's a while back from someone in Arizona that had a gorgeous setup...

I was going to go with 20's but decided on 19's for the reason of shoving a tad taller tire in there because of how horrible NM roads are.

But I want to try and grab the best lip possible...

So from everything, what is the results? 19x7.5"? 19x8", or 19x9"? And with that said, what about offsets? I don't want the wheels to budge outside of the fenders like some wheels do...

 

[daren_p]

No offense, but I kinda do. And thats the only reason were arguing. Because you guys don't seem to get it. A 225 width tire on a 7" wheel is the same on a 8" wheel? How do you figure this? A 225 tire going from a 7" wheel, to an 8" wheel will shorten the overall diameter of the tire. Once again, FORGET THE TIRES! Please!

I really seriously hate asking simple freaking questions and then getting people arguing with me about crap I never asked. People always argue with me about tire sizes, and I seem to always show them up. And its kinda BS already. Nobody does any actual reading.

All I care, and give a crap about, weather you think I'm wrong or not about what tires I never once mentioned, is getting the perfect width wheel, with the perfect offset to put the wheels where I want them. I WILL DEAL WITH TIRES THEN!

But since these concepts, as you put it, are too difficult to come by, I'll ask somewhere else. Really starting to be very difficult to get minor help from DSM'rs... very strange.

You should stop flaming on everyone who is trying to help as they are correct & you are still wrong. Either your not paying attention to their posts or you are getting your words mixed up as now you are argueing statements they haven't even made. No body has said anything about a 225 width tire being different widths depending on what rim width you put it on (though it will change very slightly because of stretching or squishing the sidewalls to fit the rim but not enough to make a noticeable difference). They are refering to sidewall height & overall height of a tire, which you seem to be confused about. You said for example a 40 series tire is always the same sidewall height no matter what width the tire is & a 45 series always has a higher sidewall then a 40 series, this is completely false as has been stated above (even by the explination you, yourself posted). Sidewall is a percent of tire width, so the larger the tire width, the taller the sidewall, even though it may be the same series. A 40 series tire can vary well have a taller sidewall then a 50 series, depending on the tire width. Maybe what you mean to say is a tire with the same width & series will always have the same sidewall height no matter what the rim size is, which is true.

Take for example my wheels are 225 wide 40 series. A C5 vette runs 275 wide tires & still a 40 tire, both are on an 18" rim. Even though these are both 40 series tires, the sidewalls on the tires on the Vette are larger (& obviously tire diameter overall is larger) because like was said sidewall is a percentage of tire width. 40% of 275 is more then 40% of 225. Math:

Vette: 40% of 275 = 110mm / 25.4 (convert mm to ") = 4.33" sidewall
Me: 40% of 225 = 90mm / 25.4 (convert mm to ") = 3.54" sidewall

So you can se even though they are both a 40 series tire, they both infact have different size side walls.

Either way what width of tire do you plan on running? A 8" rim with a 40mm offset would be an ideal rim & able to accomodate a fairly wide tire.

 

[InfiniteGSX]

daren_p, please re-read everything over again... slowly this time! You say I'm not reading posts or whatever? They are the ones that are doing what you just said. I never ONCE mentioned anything about tire size. Except going with a tad thicker tire by going with a smaller wheel. That was it. What in that mentions tire width, tire sidewall or any of the bull crap they are arguing with me about?

I know 100% what I'm talking about. I'm very, VERY confused on where they were trying to help me. Except for gixrman. And the small quote you made, "A 8" rim with a 40mm offset would be an ideal rim & able to accommodate a fairly wide tire." That is the ONLY help I have received. Because Tire width and sidewall size was never asked, or mentioned. But it was argued with. But see your still not getting what I was saying. A 45 series tire is still a 45 series tire. The sidewall is still a 45. Weather or not a wider tire will make it a taller tire or not. I agreed with that statement, and you guys are saying I'm wrong and your right... but thats the same as saying 1 is 1 but isn't 1? How does that work? I agreed. Yes if you go with a wider tire, you can overall get a TALLER Diameter tire. But Sidewalls don't change, Just because you make the tire wider, doesn't make the sidewall taller, Sidewall is sidewall. Not tread. Sidewall is a specified area on a tire. Weather there are 40" of rubber above the sidewall, does not mean that 40" is sidewall, its tread.

Now, with that said, let it BE GONE! No more arguing about crap I didn't ask.

And onto the question you asked. which kinda goes back to tire size ... I don't know yet. It all depends on how wide of a wheel I go with. Which is why I don't want to worry about wider tires. I dont want to shove a wider tire in there, to get a taller tire, for the fact of rubing. I would rather go with the same size width, and just a next step up on the series.

So, with that said... for a 19x8" wheel, Rec. Tire Size: 235/35-19... I might just go with a 235/40-19.

Thanks for that last part, I found a few wheels that are 19x8" and +40mm offset.

 

[wret]

Because you guys don't seem to get it. A 225 width tire on a 7" wheel is the same on a 8" wheel? How do you figure this? A 225 tire going from a 7" wheel, to an 8" wheel will shorten the overall diameter of the tire. Once again, FORGET THE TIRES! Please!

Interesting idea. First time I've heard it.

As you know, tires are made of stretchy stuff: rubber, and un-stretchy stuff: steel. The tread is one area that is lined with steel. When the tire is inflated, the tread shape and the outside diameter are limited by the steel or other reinforcement, rather than by the side walls. Mounting a particular size tire on varying wheel widths (within manufacturers' recommendations) does not significantly change the fitment attributes that we are most concerned with: tread width and overall diameter.

The reason I did not directly answer your first question is that I do not recommend 19 inch wheels and tires to anyone. I'm not such a snob not share my views on what will fit, but if someone asks what 19's to get I keep my mouth closed (or fingers still).

Without discussing diameter, 8" is a great width for a 2g dsm wheel. 8.5" is my favorite. 9" is a little wide. 7" is okay for up to 225 series tires but limiting if you want to go wider. +40mm is the best offset. (Did I say that already?)

I really seriously hate asking simple freaking questions and then getting people arguing with me about crap I never asked. People always argue with me about tire sizes, and I seem to always show them up.

Always? Good luck fitting those tires.

 

[InfiniteGSX]

Well I have a FWD, so no real use of going with such a fat wheel. If I had an AWD, that would be another story, I'd be trying to shove the widest rim/tire in there as possible.

As for the wheel diameter. I'm going with lightweight 19" wheels. 18's are too small. 17's are insane. I hate having a wheel well that I can shove a 4x4 tire into. I also want to lower the vehicle as much as possible to get the wheels/tires to tuck in a nice, sporty way, without the front bumper scraping the ground.

 

[daren_p]

daren_p, please re-read everything over again... slowly this time! You say I'm not reading posts or whatever? They are the ones that are doing what you just said. I never ONCE mentioned anything about tire size. Except going with a tad thicker tire by going with a smaller wheel. That was it. What in that mentions tire width, tire sidewall or any of the bull crap they are arguing with me about?

I know 100% what I'm talking about. I'm very, VERY confused on where they were trying to help me. Except for gixrman. And the small quote you made, "A 8" rim with a 40mm offset would be an ideal rim & able to accommodate a fairly wide tire." That is the ONLY help I have received. Because Tire width and sidewall size was never asked, or mentioned. But it was argued with. But see your still not getting what I was saying. A 45 series tire is still a 45 series tire. The sidewall is still a 45. Weather or not a wider tire will make it a taller tire or not. I agreed with that statement, and you guys are saying I'm wrong and your right... but thats the same as saying 1 is 1 but isn't 1? How does that work? I agreed. Yes if you go with a wider tire, you can overall get a TALLER Diameter tire. But Sidewalls don't change, Just because you make the tire wider, doesn't make the sidewall taller, Sidewall is sidewall. Not tread. Sidewall is a specified area on a tire. Weather there are 40" of rubber above the sidewall, does not mean that 40" is sidewall, its tread.

Now, with that said, let it BE GONE! No more arguing about crap I didn't ask.

And onto the question you asked. which kinda goes back to tire size ... I don't know yet. It all depends on how wide of a wheel I go with. Which is why I don't want to worry about wider tires. I dont want to shove a wider tire in there, to get a taller tire, for the fact of rubing. I would rather go with the same size width, and just a next step up on the series.

So, with that said... for a 19x8" wheel, Rec. Tire Size: 235/35-19... I might just go with a 235/40-19.

Thanks for that last part, I found a few wheels that are 19x8" and +40mm offset.

Josh, the whole reason this even came up is because Daniel was trying to correct the miss information YOU had posted about sidewall height. It only continued because you replyed with more miss information & others where trying to correct this miss information. We don't wan't newbies coming on here reading some of your posts, thinking they are correct & ending up with a wrong sized setup. Your above post started to sound logical, but then went off on another incorrect tangent. Obviously communication is getting lost somewhere here, so we will no longer talk about sidewall height as this thread is full of miss information.

A 235/40/19 tire is going to be a good amount taller overal compared to a stock setup, so you won't be able to lower the car down as much as normal & the car will end up sitting higher then normal off the ground. Not to mention it will throw off your gauges, if that matters (& gear ratios). IMO 18's are more then large enough for a 2g with a nice drop & still allow enough sidewall for daily driving. If you check my gallery, those are 18's with about a 1.7" drop to give you an idea. My rims are also 8" wide & have a 40mm offset. The back wheel well lips had to be rolled abit to prevent rubbing.

As for tire width, you say being fwd your not worried about width? What kind of power goals do you have? If you plan on making a good amount of power, tire width should be more important in a fwd compared to an awd as awd's will hook with basically any tire, while fwd will not. A wider tire is usually more ideal in a fwd to try & maximize the minimal traction they have. Also an extremely low sidewall also hurts straight line traction as well, just something else to consider.

If this is going to be a show car, then hey, go with what ever you like but if you want to get some performance out of the car, I honestly would recommend 18's (& these still are less then ideal but like you mentioned can't see me running less rim, well atleast on the street)

Like I mentioned a 8" rim with a 40mm offset works well but you need to have a tire size in mid, just to make sure it will work with this rim width. As both tire width & sidewall height has a direct effect on what rim they can fit on.