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Do stretched tires compromise grip/handling?

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    Do stretched tires compromise grip/handling?

    Let's say two same tires with two different rims one makes the tire stretch the other makes it a straight wall. Does stretching the tire compromise any handling characteristics? Does the ride quality change? Thanks

    #2
    Everything changes with stretch. When you lose your side wall to stretch it makes the walls very stiff. Sometimes the bead will pop loose but all depends on how MUCH you do. Also on how you drive it, racing on stretch is dumb. Mostly stretch is for people that suffer from stancing normal cars with small arches. that is really the only way to go low AND have wide wheels tucking a nice bit of rubber. I am tucking 16x9.5 on my e24 with NO rolling or pulling what so ever.

    It all depends on what car you go for. E30 will need stretch and rolling with wheels wider than 8". But again the offset plays a HUGE role in what you can fit under the arches too.

    What is the specs on the wheels?(They are wheels, not "rims". Rims are the outer section of the wheel)

    Once we know the specs height and width, we can then give you an idea of what you need to pick out. For 16x8-9" wheels a 205-215 with a 45 wall is spot on. For 17" it is about the same. It all depends on how low you are planning on going(Tucking rubber). So figure out the specs, the offset and how low you are planning on going.
    Last edited by F34R; 06-21-2011, 03:42 PM.
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      #3
      It's really a horse a piece, and doesn't do all THAT much, But...

      Stretching the tire takes up the sidewall flex it would normally have, resulting in a more rigid tire. Stretched tires have a lot less give, and are more likely to lose their grip in hard driving situations. But the other side with a straight wall, while having more flex and giving more feedback as to when it's going to lose grip with a more comfortable ride.

      Unless you track it, you'll never really notice the instantaneous grip loss that can occur. But it will be less comfortable and more likely to bend/scuff a wheel.

      Now, mind you, this is all dependent on amount of stretch too. A mild stretch can be a good thing for spirited driving with a tire that doesn't have a reinforced sidewall. But, those tend not to have the best grip out there anyways.

      There are those that will argue tooth and nail that it makes zero difference.. It's the extreme examples that are the worst. But a little stretch never hurt anybody, and is common out on the track when you can't afford higher performing ones.

      My thought is, and always has been. Use a wider wheel for what it was intended. A wider tire


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        #4
        How about this amount of stretch? Is this thought as a lot of stretch? Thanks

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          #5
          You can track a stretched tire, drift cars do it all the time, will it make you faster? No. Basically there is sidewall rigidity, as stated above, hence why drift cars run stretched tires more often than not. Having too much sidewall though, will give you rollover, and will sacrifice grip and stability. Best to have a nice square setup for track.
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            #6
            A very minimal stretch (not running oversized) is actually good on the track. I am into the Hellaflush stuff, but I also do track too. I was discussing this a while ago with a friend who is number 1 in FWD at Redline Time Attack. He also drives the current number 1 (pretty sure) AWD car in Redline. I don't remember what classes they are. Some kind of modified category.

            Anyways...

            In small amounts (heavier amounts too) the stretch stiffens up the sidewalls and creates a tire that doesn't lose quite as much time between transitions because the tire doesn't rotate from side to side as much. It doesn't seem like much, but a fraction of a second here and there means more time shaved off the over all at the end. You'll notice most of the Time Attack cars in Japan do no run oversized tires on the rim. With the limit being 265/35/18's in most of the categories you would think they would run a 9.5" wheel or similar. Most of the fastest cars are running 10.5" and 10" on a 265/35/18 width tire.

            This is a different style than most AutoX cars. They typically go for shear grip (alot of tire mounted on a smaller wheel) over anything else. The cars are going slower also than an all out Time Attack beast. A lot of the classes are limited to stock wheel widths and other restrictions too.

            this is one of those Time Attack cars I was speaking of.. Cyber EVO... one of the fastest Time Attack cars of all time.



            I think tons of tire meat looks cool too, but me personally I like to find the balance between width, contact, and rigidity.
            GRIPPY'S*GARAGE

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              #7
              Answer: A moderately stretched 205 will probably be faster than an unstretched 205. However, an unstretched 225 on the same rim will be faster than the stretched 205. And by moderately stretched, I mean something like a 205 on an 8" rim. Not that silliness with 9" or wider wheels crammed under stock fendered E30s.
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                #8
                I was just about to ask about 205's on an eight inch for track.
                Thanks for another informative thread guys.

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                  #9
                  I would have to say that a 225 on 8 will provide more grip than a 205 on 8 as an example unless 205 is a super soft tire and 225 is a crap tire.
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                    #10
                    Woops... did somebody say 205's on 9 inch wheels under a stock fendered e30...?


                    Yea, I rock stretched but its slight enough to auto cross and take spirited drives, though if your plan is a track oriented set-up, you definitly want to go less than this. See: grippymonkey's post....


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                      #11
                      Originally posted by E30 F34R View Post
                      Everything changes with stretch. When you lose your side wall to stretch it makes the walls very stiff. Sometimes the bead will pop loose but all depends on how MUCH you do. Also on how you drive it, racing on stretch is dumb. Mostly stretch is for people that suffer from stancing normal cars with small arches. that is really the only way to go low AND have wide wheels tucking a nice bit of rubber. I am tucking 16x9.5 on my e24 with NO rolling or pulling what so ever.

                      It all depends on what car you go for. E30 will need stretch and rolling with wheels wider than 8". But again the offset plays a HUGE role in what you can fit under the arches too.

                      What is the specs on the wheels?(They are wheels, not "rims". Rims are the outer section of the wheel)

                      Once we know the specs height and width, we can then give you an idea of what you need to pick out. For 16x8-9" wheels a 205-215 with a 45 wall is spot on. For 17" it is about the same. It all depends on how low you are planning on going(Tucking rubber). So figure out the specs, the offset and how low you are planning on going.
                      Whats this jibba jabba

                      On a productive note, has anyone read the recent mx5 tire comparo in grm?
                      -Jay

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                        #12
                        I <3 your wheels Funfgan
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                          #13
                          Haha, thanks a lot man! And I have... My Star Spec's did fairly well.


                          Go here be happy!

                          Ratchet Garage e30 V8 build.

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                            #14
                            I <3 your wheels Funfgan
                            +1
                            What tyre sizes are you running. It looks to be a higher profile tyes stretch.

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                              #15
                              theyre 205/50R15. Yea, I too love the meaty stretch haha. But Johny Cash, where were you going w/ that?


                              Go here be happy!

                              Ratchet Garage e30 V8 build.

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