Tire Size Recommendation Request

[unlmtdndeavor]

Actually 225/35-18's are much smaller diameter than stock. 225/40-18 is closer. Do your own math here: http://www.miata.net/garage/tirecalc.html

And unlmtdndeavor, my pointer hovered over the negative rep point button for that one. There are good reasons why some people would want to use smaller tires, such as torque gains for autocrossing, but for street cars the narrow sidewall and wheelgap would be unacceptable. What brand of 255 width tires do you know that specify a wheel as narrow as 8 inches?

The statement I made was a generalization of what size WILL fit...not what was ideal. I drive a street car and run a narrower sidewall than stock (17x9 255/40/17), I do not feel as if that is unacceptable. That goes along with my feelings that an 18" wheel are unacceptable, so to each his own.

But I will make the correction that a 255 is not ideal on a 8" rim. For a second I forgot this was in the handling section, I just generalized as I have 255/50/16 DR's on 16x7.5" and that is well within manufacturer's spec. Actually, I could go with those tires on even a 16x7. Sorry if my post was too generalized.

 

[HyperGSX]

So is 225/40/18 the better choice?

 

[wret]

Depends. Copy this and attach it. Then we can help you decide on what is best.

 

[D_Eclipse9916]

I run 235/40/18s on mine. 225/40 is a small sidewall, thats insane that somebody would try to run a 225/35/18. Personally for city driving I would suggest a 225/45/18 if your not going 235s...See the pictures I post, and see how small the tire is at 235/40/18

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[92awddsm]

The statement I made was a generalization of what size WILL fit...not what was ideal. I drive a street car and run a narrower sidewall than stock (17x9 255/40/17), I do not feel as if that is unacceptable. That goes along with my feelings that an 18" wheel are unacceptable, so to each his own.

But I will make the correction that a 255 is not ideal on a 8" rim. For a second I forgot this was in the handling section, I just generalized as I have 255/50/16 DR's on 16x7.5" and that is well within manufacturer's spec. Actually, I could go with those tires on even a 16x7. Sorry if my post was too generalized.

To answer your thread title of what will fit...anything as narrow as a 205 and as wide as a 255 will fit on those wheels.

I would personally go with a 225/35/18

You said 225-35-18, not 255-35-18. A 255-50 will fit a 7.5" wheel a hell of a lot better than a 255-35 fits an 8" wheel. With the 50, the sidewall(5") is much taller and can easily compress to fit the smaller wheel without compromising the footprint of the tire. But rollover becomes an issue which compromises handling. Trying to compress a 255-35 onto an 8" wheel causes the tread of the tire to crown because there isnt enough sidewall(3.5") there to compensate. When the tread crowns, you could effectively loose up to 50% of your footprint without running them severely underinflated.

I agree with previous statements, 225 or 235-40-18. I personally run 235-40-18 on my 1g that I got from someone that had them on a 2g. This is on an 8" wheel and they fit perfect and look good doing it.

 

[DSMSpyder99]

When I upgraded from 225/45/17 to 245/40/17 the car felt more planted in the turns, it made a huge difference. I would go with a 235/40/18 or 245/35/18, 225s is just not enough tire for DSM, they are too much car for such narrow tires.

 

[daren_p]

225/40/18's here as well on an 8" rim, this seems to be the most common size for 2g's but I'll probably look at 235/40/18's next time I need tires as well, which should fit without too much hassle. Some brands 225's end up being slightly wider then others. With my current 8", 40mm offset rims I had to roll the inner lip on the rear fenders to prevent rubbing.

 

[HyperGSX]

1. My car is a:
b) 2g DSM

2. My wheel size is:
Diameter: _18__
Width: _ 8_
Offset: _+38_

3. My current or future suspension height will be lowered
b) One to 1.5 inches

4. If suspension is lowered,
a) Rear camber will be adjusted to less than 1° negative.
b) Rear camber will be adjusted to within 1° to 1.5° negative.
c) Rear camber will be more than 1.5° negative.

5. Rear fender flange rolling:
b) I will not roll the fenders.

6. My driving style is:
b) Street only, but I like to feel secure on twisty roads.

7. I have searched for and read the FAQ's, Tech Articles, and threads on wheel and tire fitment:
b) No, I just want someone to tell me what to do.

 

[HyperGSX]

Is the +38 offset going to make my wheels stick out a lot?

 

[wret]

1. My car is a:
b) 2g DSM

2. My wheel size is:
Diameter: _18__
Width: _ 8_
Offset: _+38_

3. My current or future suspension height will be lowered
b) One to 1.5 inches

4. If suspension is lowered,
a) Rear camber will be adjusted to less than 1° negative.
b) Rear camber will be adjusted to within 1° to 1.5° negative.
c) Rear camber will be more than 1.5° negative.

5. Rear fender flange rolling:
b) I will not roll the fenders.

6. My driving style is:
b) Street only, but I like to feel secure on twisty roads.

7. I have searched for and read the FAQ's, Tech Articles, and threads on wheel and tire fitment:
b) No, I just want someone to tell me what to do.

Tires: 225/40/18
4 will be "b"
And, no, you're tires will not stick out.

 

[HyperGSX]

Wret, do you think i'll need a camber kit for the front as well?

 

[wret]

For that amount of lowering, I prefer to leave the front alone and tweak the back with bolts and washers. For purely street driving it wouldn't hurt to adjust the front as well. If you want to optimize handling, leave the front alone.

 

[T9S1i]

thanks for the guide, i'll post up a new thread!

 

[T9S1i]

TIRE SIZE RECOMMENDATION REQUEST FORM

Please answer the following questions when requesting tire size recommendations.

1. My car is a:
a) 1g DSM
b) 2g DSM

2. My wheel size is:
Diameter: _____
Width: _____
Offset: _____

3. My current or future suspension height will be lowered
a) One inch or less
b) One to 1.5 inches
c) 1.5 - 2 inches
d) More than 2 inches.

4. If suspension is lowered,
a) Rear camber will be adjusted to less than 1° negative.
b) Rear camber will be adjusted to within 1° to 1.5° negative.
c) Rear camber will be more than 1.5° negative.

5. Rear fender flange rolling:
a) My fenders are rolled or will be if necessary.
b) I will not roll the fenders.

6. My driving style is:
a) Street only, with no special performance requirements.
b) Street only, but I like to feel secure on twisty roads.
c) Street and Strip.
d) Street and Autocross.
e) Other

7. I have searched for and read the FAQ's, Tech Articles, and threads on wheel and tire fitment:
a) Yes, but I just need someone with experience to validate my choices.
b) No, I just want someone to tell me what to do.




1. 1g DSM awd
2. Evo 8 enkeis. 17x8 offset 38
3. Kyb agx with eibach sportlines (~1" lowered)
4. not sure, probqbly factory specs. any suggestions?
5. not rolled, not really interested in rolling
6. street wheel with drag strip outings 1x every 1-2 months. Want to be secure on turns and twisties although turns are not my #1 passion
7. a. see most people run 235/45-17, but not sure if thats great for my application, lots of people are running 40 series, would this be better or worse for drag racing?

ive been leaning towards a 235/45/17. would this fit my car with this setup without any problems?


This is pretty much a request for a good street/dragstrip tire that will see daily driving, time at the dragstrip, and still needs to be able to handle on sprited twistie roads (although thats not my #1passion, traction at the drag strip and street drivability are #1)

One tire ive been looking at is : Dunlop Direzza Sport Z1


Another popular tire is: Kumho Ecsta MX

Im looking to spend like $130 or less per tire, before shipping.

One other thing, I live in san francisco which is foggy and in the 60*-70* range for most of the year so i need a tire that doesnt need to be ran in 100*+ temp to work. I race at infineon in sonoma and its generally a lot hotter and drier at the dragstrip.

Thanks for any help. Car will be in the 12 sec range this season with a 16g, then im looking to upgrade and hit 11's with a larger turbo (looking at the s200), probably as far as i'm going to take the car in the 1/4 mile.

 

[pneumo]

I have the Kumho MX on my car. I like them for drag racing, street use, and some twisty road action. They stick really well in the summer, and they stick well in turns. I was out driving fast in the hills yesterday when the roads were wet and cold from a recent rain and they still gripped well. They don't seem to stick as good at the dragstrip when it's cold, maybe because cold air makes the engine stronger, too. A 12 second car shouldn't have traction problems with Kumho MX's. I started having traction issues when I got in the mid 11's, but then the car only spun in first gear when I lauched it really hard.

 

[T9S1i]

cool nice to know! seems like ive heard of lots of dsmrs using these tires and they are a little cheaper than the dunlops. They are also lighter when compared to the dunlops and have a little difference in treadwear rating . 220 AA A for the kumho vs 200 A A for the dunlops.

Using Cookies
*edit* /\/\ Ha dont know why that says "using cookies", but its a tire comparison.


Do you guys think that 235/45-17 us the proper size for this rim in this application? I see a lot of people rinning 40 series as well. Would that be more for autocross/twistee driving? I was always under the impression that more sidewall is better for drag racing, but on the other hand ive heard that a 24.5" wheel is ideal for drag racing. The 40 series is 24.5 and the 45 series is like 25.5 Im not sure if that target size was for a 17" rim with a small sidewall or for a more dedicated drag wheel (say 15") running slicks or drag radials.

 

[pneumo]

Stock tires on the evo are 235/45. Stock diameter for a DSM is 24.9" so you're right in between sizes. Either way you go, it's only 1/2" difference in diameter.
Personally, I like the fat tire look that fills up the wheelwells, but I'm not sure if 235/45 will be too big and rub. 234/40 will give you a little breathing room.
btw, offset of evo wheels is 38mm.

 

[T9S1i]

ive seen a few people running 235/45 and im pretty sure they fit proper, but thats one of the main reasons i made this thread, to get confirmation that this particular size will fit my car. I'd like to rum the extra sidewall if i can get away with it, im not going for the "rubber band" tire look.

Can anyone confirm that 235/45-17 will fit evo 8 rims, 17x8 with 38mm offset on a 1g awd with a 1" drop?

 

[T9S1i]

Im leaning towards running the dunlops, are these a stiff sidewall autocross tire like the rt-615, or are they soft enough for drag racing/daily driving?

 

[allgripnoslip]

TIRE SIZE RECOMMENDATION REQUEST FORM

Please answer the following questions when requesting tire size recommendations.

1. My car is a:
a) 1g DSM
b) 2g DSM

2. My wheel size is:
Diameter: _____
Width: _____
Offset: _____

3. My current or future suspension height will be lowered
a) One inch or less
b) One to 1.5 inches
c) 1.5 - 2 inches
d) More than 2 inches.

4. If suspension is lowered,
a) Rear camber will be adjusted to less than 1° negative.
b) Rear camber will be adjusted to within 1° to 1.5° negative.
c) Rear camber will be more than 1.5° negative.

5. Rear fender flange rolling:
a) My fenders are rolled or will be if necessary.
b) I will not roll the fenders.

6. My driving style is:
a) Street only, with no special performance requirements.
b) Street only, but I like to feel secure on twisty roads.
c) Street and Strip.
d) Street and Autocross.
e) Other

7. I have searched for and read the FAQ's, Tech Articles, and threads on wheel and tire fitment:
a) Yes, but I just need someone with experience to validate my choices.
b) No, I just want someone to tell me what to do.

1.B

2. Rota Subzero
Diameter: 17"
Width: 7.5"
Offset: +45mm

3.C 1.5 - 2 inches

4.B Rear camber will be adjusted to within 1° to 1.5° negative

5.A My fenders are rolled or will be if necessary.

6.B and C Street, strip and ocassional twisty roads

7.A Yes, but I just need someone with experience to validate my choices.


What I am looking for is what offset to run so that my 235/45R17's (kumho supra 712's) wont rub on the suspension side and still tuck(with or without fender rolling, doesnt matter). I plan on running spacers, Im just not sure which size of a spacer I would need to fit my criteria. I was thinking of a 5mm or 8mm spacer to move the offset from 45 to 40 or 37. Just looking for some experience to guide me in the right direction. Thanks!

O and if there is any room to play with, Id rather have the tire closer to the fender.


Joe

 

[wret]

With that offset you should have no problem with fender clearance. The graphic below shows the approximate location of the edge or your tire tread realative to the knuckle. Compared to stock, the tire you propose is 15 mm wider (on each side). The radius is 6mm taller. The offset is 1mm less.

Looks like you'll have about 3mm clearance but this depends on actual treadwidth of the tire brand you choose.

 

[allgripnoslip]

Thanks for the reply Wret! I just have one more question. Knowing that even without spacers it will clear the arm fine, is there a way to determine how much room I have to play with on the fender side? like say I want to run a spacer to make the wheel closer to the fender to make the wheel flush with the body rather than sunken in the fender. This is probably going to be different for front and rear, correct? Basically I want the tire to be very close to the fender and yes I will roll the fender flange, as well as everything else I listed above. Thanks!

P.S you can delete my thread I started in the handling tech forum.

 

[wret]

You are probably looking at something like a 10mm spacer. Get the wheels. Mount them up. Check the clearance of the fender arches to see how far out you can go.

The fronts may give the appearance of protruding slighly more but there is less fitment concern.

 

[chavez408]

1. My car is a:
a) 1g DSM

My wheel size is: 16" rim, I am still on the stock rim.

My current or future suspension height will be lowered
My car have kyb adjustable shocks with sportline springs.

Rear fender flange rolling:
a) My fenders are rolled or will be if necessary.


6. My driving style is:
Street and Strip. Pretty much my car is my DD. But it sees a lot of twiesties. And will be run at the 1320 and road racing comming spring.


I have searched for and read the FAQ's, Tech Articles, and threads on wheel and tire fitment:
a) Yes, but I just need someone with experience to validate my choices.

I'v been looking at many different kindof tires in the market for my stock. I really would want to try and fit a 225 tire on there but right now purchasing a aftermarket rim is not the awnser. So any of you guys have any advice on wider tires for our stock rims, without rubbing the fender.

 

[allgripnoslip]

1.B

2. Rota Slipstream
Diameter: 16"
Width: 8"
Offset: +48mm

3.C 1.5 - 2 inches

4.B Rear camber will be adjusted to within 1° to 1.5° negative

5.A My fenders are rolled or will be if necessary.

6.B and C Street, strip and ocassional twisty roads

7.A Yes, but I just need someone with experience to validate my choices.

One more time, I changed my mind. The tire I plan to run is a 245/45. I am thinking that I would have to run a spacer with these as all they offer is a +48mm offset. basically I am just looking for a safe clearance while still being as close as I can to the spindle. Thanks again. looks like this setup will be +20mm to the right, 2.5mm down and 2mm to the right, correct? perhaps a 5mm spacer will work?


Joe