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Best tyre shape for cornering grip

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  • April 8, 2019 at 3:19 pm #29519
    susurruspeanut

    This forum concerns road bike tyres.

    Hello, so recently I’ve put on a rim with an internal width of 19mm and 25mm conti tyres which ended up measuring 30mm wide when fitted and the shape of the tyre is pretty much a ‘vertical’ U-shape with no bulging. 

    How would this compare in terms of cornering grip to a narrower wheel (say 15mm internal) with the same tyre fitted, resulting in a more bulbous tyre cross-section? Which is better?

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  • April 9, 2019 at 9:30 am #939371
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    hawkinspeter

    The amount of rubber in

    The amount of rubber in contact with the road is going to be mainly down to the tyre pressure which is not going to be affected by the shape. The amount of grip is going to be determined by the amount of rubber in contact and how well the rubber conforms to the road imperfections, so maybe the shape can affect how the tyre flexes but I can’t see it being a big influence.

    Anyone got any figures?

     

    April 9, 2019 at 5:47 am #939369
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    Chris Hayes

    You’ve opened a can of worms

    You’ve opened a can of worms here my friend đŸ™‚ 

    April 9, 2019 at 12:06 am #939367
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    Anonymous

    best tyre shape is not the

    best tyre shape is not the one you have and frankly a 25mm tyre on a 19mm internal rim is ridiculous, just why, 15mm is more than enough, you’ve already found out that the rim isn’t condusive to the tyre size.

    April 8, 2019 at 8:36 pm #939365
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    Simon E

    In theory I’d suggest that it

    In theory I’d suggest that it’s the one that puts more rubber on the road. However, the real world difference may be insignificant.

    The pressure you run may be a more significant factor and in the end, short of crash-testing each, it’s probably the one that feels more secure to you.

    April 8, 2019 at 8:21 pm #939363
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    CXR94Di2

    Ive got 20 mm internal rims
    Ive got 20 mm internal rims with 25mm tyres. They come out 28mm. They corner fine. I put it down to compound material and pressure. I really doubt anyone could tell the difference until point of loss of grip, but who wants to go that far to find out

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