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Old 01-08-2007, 09:00 PM   #1
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how do tires/wheels size affect performance?

Many people have been telling me if I really want to upgrade performance on my car or any car that I should invest in bigger tires and wheels.


I have also heard that TOO BIG can actually take subtract from performance and potentially create a lot of unstrung weight.



So my question is how do larger wheels/tires affect performance and how big is too big?
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Old 01-08-2007, 09:04 PM   #2
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Quote:
Originally Posted by Bronxie
Many people have been telling me if I really want to upgrade performance on my car or any car that I should invest in bigger tires and wheels.

I have also heard that TOO BIG can actually take subtract from performance and potentially create a lot of unstrung weight.

So my question is how do larger wheels/tires affect performance and how big is too big?
Yeah, be real careful about having too much "unstrung" weight.

Now I remember one of the reasons I stopped logging in.
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Old 01-08-2007, 09:07 PM   #3
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Quote:
Originally Posted by vwhobo
Now I remember one of the reasons I stopped logging in.
Because no one liked you?
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Old 01-08-2007, 09:08 PM   #4
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Quote:
Originally Posted by vwhobo
Yeah, be real careful about having too much "unstrung" weight.

Now I remember one of the reasons I stopped logging in.

Because of me? </3
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Old 01-08-2007, 09:12 PM   #5
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vwhobo beat me to it, but it's "unsprung" weight...and another term that relates to it is rotational mass. I don't know much about tires, but fatter tires do equal greater traction, and smaller ones consequently mean less traction, but at the same time less energy is required to spin them...
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Old 01-08-2007, 09:14 PM   #6
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Like it ****ing matters. Only vwhobo would be such a woman about something like that.


At least unstrung is a word. Unsprung isn't even in the dictionary!
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Old 01-08-2007, 09:15 PM   #7
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Quote:
Originally Posted by Bronxie
Like it ****ing matters. Only vwhobo would be such a woman about something like that.


At least unstrung is a word. Unsprung isn't even in the dictionary!
"Unsprung" isn't, "unsprung weight" is .
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Old 01-08-2007, 09:17 PM   #8
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Originally Posted by chris_knows
"Unsprung" isn't, "unsprung weight" is .

Oh definitely. How could I have missed that?


If you get bigger wheels would your speedometer be offset by a few MPH?
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Old 01-08-2007, 09:18 PM   #9
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I might be wrong here, but I think larger wheels (diameter, not width) give you less power. I'm picturing them like gears, and the tires are the gears at the end. The axle will spin more or less at the same speed no matter what the tire/wheel size. If larger tires spin at the same rate in RPMs, they will cover a greater distance because of the larger circumference. However, just like using larger gears at the end, they will be easier to stop moving, therefore creating less power. By this thinking larger wheels would give you a higher theoretical top speed, and it may account for incorrect speedos when people greatly change their tire size. Anybody confirm/deny this?
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Old 01-08-2007, 09:19 PM   #10
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Quote:
Originally Posted by Bronxie
Like it ****ing matters. Only vwhobo would be such a woman about something like that.

At least unstrung is a word. Unsprung isn't even in the dictionary!
I see you're still honing the art of being a moron to a fine edge. Good job.

http://www.google.com/search?hl=en&q=unsprung+weight

Apparently at least 143,000 others haven't read your dictionary.

http://www.m-w.com/cgi-bin/dictionar...ry&va=unsprung
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Old 01-08-2007, 09:23 PM   #11
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Quote:
Originally Posted by vwhobo
I see you're still honing the art of being a moron to a fine edge. Good job.

http://www.google.com/search?hl=en&q=unsprung+weight

Apparently at least 143,000 others haven't read your dictionary.

http://www.m-w.com/cgi-bin/dictionar...ry&va=unsprung

HMMM...
Quote:
Originally Posted by merriam webster
unsprung: Not equipped with springs.


I guess you're right, that definitely is relevant here.


NOT.



Talk about being a moron!


And mind you, dictionary.com says, "I know every single word in the english langauge and I have no idea what 'unsprung' means."
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Old 01-08-2007, 09:26 PM   #12
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Quote:
Originally Posted by giant016
I might be wrong here, but I think larger wheels (diameter, not width) give you less power. I'm picturing them like gears, and the tires are the gears at the end. The axle will spin more or less at the same speed no matter what the tire/wheel size. If larger tires spin at the same rate in RPMs, they will cover a greater distance because of the larger circumference. However, just like using larger gears at the end, they will be easier to stop moving, therefore creating less power. By this thinking larger wheels would give you a higher theoretical top speed, and it may account for incorrect speedos when people greatly change their tire size. Anybody confirm/deny this?

I thought about that too but I wasn't so sure.
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Old 01-08-2007, 09:26 PM   #13
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Quote:
Originally Posted by Bronxie
Oh definitely. How could I have missed that?


If you get bigger wheels would your speedometer be offset by a few MPH?
It depends on the size, but I think it was said on here that for every inch that you increase your diameter, you have to decrease your sidewall bu 10%, although it would depend on how thick your wheels are then lol. The ECU can be programmed for another size though.
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Old 01-08-2007, 09:28 PM   #14
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Originally Posted by chris_knows
It depends on the size, but I think it was said on here that for every inch that you increase your diameter, you have to decrease your sidewall bu 10%, although it would depend on how thick your wheels are then lol. The ECU can be programmed for another size though.


I really am just looking at wider tires. My car has 18" "S" wheels and I think that's adequate... I think 19" would make for a really uncomfortable ride as well.

So is it the width that will increase traction?
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Old 01-08-2007, 09:31 PM   #15
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Quote:
Originally Posted by Bronxie
I really am just looking at wider tires. My car has 18" "S" wheels and I think that's adequate... I think 19" would make for a really uncomfortable ride as well.

So is it the width that will increase traction?
More suraface area = more traction.
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