19" rims affect 1/4 times?

[xsteclipse6902]

I was wondering if 19 inch rims affect your 1/4 time at all. I noticed someone posted below saying that "i have 19 inch rims so i will probably run high 15's instead of low 15's". Do they affect your 1/4 time?

PS: Sorry if this is in the wrong forum....Feel free to move it

 

[jesster84]

With 19 inch wheels, it will take much more force to get them turning. Think of it as lowering your gear ratios. If you consider how much more torque it takes to get a larger rotating mass and more importantly, diameter, 16 inch wheels would stand out as the obvious choice for race only. Sounds like you're conscerned with image as well, so if you want 19's, get 19's. Also, if you mod much you're going to need to keep an eye on your axles if you're using such large tires.

PS) Sport Compact Car did a test in which they took a car with 16's or 17's down to 15 inch stock tire size, and it ran .4 or .5 quicker. I'll look up the issue # if you guys want...just let me know.

 

[jmc94gsx]

Have you ever wondered about some 800 hp Supras hitting high tens? Kind of high times for that much power, now look at their rim size, they don't get out of the hole worth a shit.

 

[Rice Over Wheat]

Originally posted by ProjectTwin
The diameter of the wheel doesn't make a difference on distance traveled over a rotation...it's the circumference of the tire that matters

I already accounted for that. That's why I said "equivelent size tires" on both hypothetical sets of wheels.

ROW

 

[ProjectTwin]

Originally posted by Rice Over Wheat
I believe all weights being equal, the larger the rim the greater the top end but you lose some acceleration off a launch. Conversely, the smaller the rim the faster the launch but less top end.

I generally hear that 17s are the best compromise for wheel size. If you go 18 then pay for quality low weight wheels to make up for the increase in diameter.

This is conjecture, but I'd think that a FWD with some power would benefit from larger wheels off a launch because of wheelspin.

ROW

No you didn't. You didn't mention tires at all in that post.

In your second post (the first one I quoted) you're right, you did mention tires of equal sizes...

But you went on to say that you'd travel farther with the larger wheel...yet the overall tire size is the same?!

It still doesn't work.

Now we know why you're not a physics major.

 

[kurupt]

Thank u jesster! finally...ROW, u don't have any idea wtf ur talkin about man. u don't make a damn bit of sense. it doesn't come down to tires OR rims alone being the determining factor in your top end mumbo jumbo. my stock tire size is 205/55/16 which have a DIAMETER of 24.87", now if i had 225/35/19 as someone else suggested as a great drag tire, i'd have a diameter of 25.20", which is close to stock. this greatly depends on the choice of tire. a 225/45/17 has a diameter of 24.97", this is the upgrade i went with simply because it was as close to stock diameter as i could get, therefore my speedo isn't phukd up and no ROW, sadly i won't lose any top speed if i put 13" - 19" rims on my car as long as i keep the diameter of the wheel/tire 'combo', close to the same. keep in mind, a 195/70/14 has a diameter of 24.74". pretty close to the previously mentioned 19's huh? i posted an article a few months back on exactly how to calculate tire diameters for those interested.

As for drag racing... i personally think the guy that recommended a 225/35 combo for drag racing is on crack. i'd much rather keep my stock wheel/tire combo for drag racing despite the weight. you're not gonna catch very much traction with a sidewall equivalency of 6 rubber bands. if u must have large rims, try something like a 245/40/18 or something with a little more sidewall than a 225/35 anyways. just look at some of the guys that actually take their car to the track and pull decent times profiles, some of them post what wheel/tire combo's they use for the street/strip, and usually know what they're talking about.

Anyways...there you have it, my educated opinion. people...please don't post stupid things if you have no idea what you are talking about, these people want facts, not your stupid uneducated theories. Lata...

 

[onepimpclipse]

Originally posted by kurupt


As for drag racing... i personally think the guy that recommended a 225/35 combo for drag racing is on crack.

He asked if 19's would affect 1/4 mile times. I was simply stating that with a 225/35 would be pretty close to stock with 19's. You know since that was the question, not if YOU thought 18's would be better. I'm sorry I tried to answer the original poster's question.

Just to recap, I didn't say you were wrong, in fact I agree with you about 245/40/18, but that is not what was asked. No reason to insult me just for answering his question.

 

[KFT0001]

Just wanted to correct that larger wheels (including the tires) will not give you more top end power. They'll give you a higher top speed, but less power to get there.

At the absolute top end of your car's final gear, each rotation of the wheels would travel a greater distance than the 16s. Your RPMs should redline __ mph faster than when with 16s. Wheel weights being equal, the engine should have to work about the same effort for each revolution.

In physics you learn that you don't get anything for free (law of conservation). Your engine has a certain amount of power. As you stated, bigger wheels will travel a greater distance per revolution than a smaller wheel. The engine puts out the same power each revolution no matter the wheel. Now if you spread the power out over a longer distance, you will get less acceleration. If you condense the power into a smaller distance, you will get more acceleration. Also one other thing to note is that with rotational mass, weight increases exponentially the farther out from the center of the axis. Two similar sized tire/wheel combo's will perform very differently if one has all the weight on the very edge of the wheel compared to one with all the weight on the very inside of the wheel (not that there's anything this extreme, but it makes for a simple example).