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Thread: Will increasing aspect ratio affect performance?

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    Senior Member TYP85's Avatar
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    Default Will increasing aspect ratio affect performance?

    Will increasing the tire's aspect ratio affect performance?

    Currently running 225/45-15 RA-1's Looking to try 225/50-15 Proxes RR's, found an amazing deal on them.
    Using them on a fwd Audi, 2,700lbs. with driver, track suspension, about 200hp.
    Would increasing the sidewall height have a negative effect on handling? I can use the small change in gearing, I understand the RR's are a step up from the RA1's?

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    The RRs are a fine tire and an improvement over the RA1. I suspect you'll be faster.

    If you can use the taller gearing they will likely serve you just fine. Handling will be challenging to compare to the RA1 because the RR is quite different. Handling between the 45 and 50 aspects probably isn't as significant as the effect on acceleration.

    It all comes down to application. When I was competing in TTB many years ago, I found 255s to be noticeably slower than 235 or 245s for my application. Car was ~230whp/3260lb, and gearing was a bit too tall in 3rd-5th as it was. The 255 were almost an inch taller and 1-2lbs heavier per corner so it didn't help the situation. Despite being significantly wider they were a few tenths/lap down and noticeably slower acceleration. I preferred the shorter tires in MY application.

    Are these for fun or comp? If the former I wouldn't think twice about buying.

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    Senior Member TYP85's Avatar
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    Quote Originally Posted by SeanB View Post
    The RRs are a fine tire and an improvement over the RA1. I suspect you'll be faster.

    If you can use the taller gearing they will likely serve you just fine. Handling will be challenging to compare to the RA1 because the RR is quite different. Handling between the 45 and 50 aspects probably isn't as significant as the effect on acceleration.

    It all comes down to application. When I was competing in TTB many years ago, I found 255s to be noticeably slower than 235 or 245s for my application. Car was ~230whp/3260lb, and gearing was a bit too tall in 3rd-5th as it was. The 255 were almost an inch taller and 1-2lbs heavier per corner so it didn't help the situation. Despite being significantly wider they were a few tenths/lap down and noticeably slower acceleration. I preferred the shorter tires in MY application.

    Are these for fun or comp? If the former I wouldn't think twice about buying.
    Thanks for the info, they are for fun, it's for the car in my sig which I still drive on the street (on different tires). I find I often run out of revs in 3rd gear on track, a little taller gearing wouldn't hurt!

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    Senior Member ELO168's Avatar
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    Mind sharing where you found the deals for the RR?
    http://touringcarclub.net/

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    Administrator ucfbrett's Avatar
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    Quote Originally Posted by TYP85 View Post
    I find I often run out of revs in 3rd gear on track, a little taller gearing wouldn't hurt!
    Barring an inoperative fourth gear, may I suggest upshifting?

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    Senior Member TYP85's Avatar
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    Quote Originally Posted by ucfbrett View Post
    Barring an inoperative fourth gear, may I suggest upshifting?
    I have to shift into 4th. coming over the rise of turn 6 @ big willow, I have to shift into 4th. coming into the bowl running clockwise @ the streets, I'd like to stay in 3rd a little longer!
    ucfbrett likes this.

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    Senior Member TYP85's Avatar
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    Quote Originally Posted by ELO168 View Post
    Mind sharing where you found the deals for the RR?
    $171.99 ea, free shipping, but you get dinged for tax.....

    https://www.amazon.com/gp/product/B0...=ATVPDKIKX0DER

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    Senior Member ELO168's Avatar
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    That is about going cost for them. You can get 225/45/15 $180 each picked up here in greater L.A.
    Tax included
    http://touringcarclub.net/

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    Senior Member TYP85's Avatar
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    Quote Originally Posted by ELO168 View Post
    That is about going cost for them. You can get 225/45/15 $180 each picked up here in greater L.A.
    Tax included
    WHERE?? 225/45 RR's are about $200+ online + tax and shipping....

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    Senior Member ELO168's Avatar
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    Sorry the $180 is wholesale.
    $200 each, cash for retail, picked up in San Gabriel
    Going to get a set myself
    http://touringcarclub.net/

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    Senior Member ELO168's Avatar
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    Anyone needs some?
    http://touringcarclub.net/

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    Senior Member TYP85's Avatar
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    Amazon is $744.00 with tax to my door.......
    Last edited by TYP85; 04-18-2017 at 08:41 PM.

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    Senior Member ELO168's Avatar
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    Quote Originally Posted by TYP85 View Post
    Amazon is $744.00 with tax to my door.......
    Not bad at all, if for 225/45/15
    http://touringcarclub.net/

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    Senior Member ELO168's Avatar
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    Spoke to the guy and he is willing to do $180 each for group buy.
    That is for 225/45/15 Toyo RR
    Cash picked up in Irwindale.
    Let me know if anyone want some so we can meet up there.
    http://touringcarclub.net/

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    Senior Member ELO168's Avatar
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    Even better deal now
    $170 each, cash
    It takes 2-3 days to get them
    i will get a set, so need another one to get another.
    Bueller bueller
    http://touringcarclub.net/

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    Senior Member TYP85's Avatar
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    Quote Originally Posted by ELO168 View Post
    Even better deal now
    $170 each, cash
    It takes 2-3 days to get them
    i will get a set, so need another one to get another.
    Bueller bueller
    Dammit! I just paid for mine........

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    Senior Member ELO168's Avatar
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    Try to get refund.
    As I need someone to get another set in order for the group buy discount.
    http://touringcarclub.net/

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    Senior Member TYP85's Avatar
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    Quote Originally Posted by ELO168 View Post
    Try to get refund.
    As I need someone to get another set in order for the group buy discount.
    OOOPS!!! Too late......20170420_165450_HDR.jpg

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    Quote Originally Posted by ELO168 View Post
    Try to get refund.
    As I need someone to get another set in order for the group buy discount.
    This sounds less like a problem and more like an opportunity.

    For racers a stash of tires is as good as money in the bank.
    ELO168 likes this.

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