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Does anyone know the Yokohama alternative to the Avon 5 x 22 x13 for classic racing. Some people use Yokos abroad any ideas ?

We ran yokohamas last year will look at the tyres in the morning for you

Hi Mike,

It's the AO48R. I would guess the 175/60/13. Think the contact patch is about 6" although there has been some arguing about that. I think the P4 machines can run them. The Roeberry's did. Last time I looked they were not allowed on the P3 bikes. Would have to check with Ian now.

Martin, I think you had the 10" AO32R.

Simon

I have used these tyres on my Imp. They really are very good and exceptional in the wet. Contact patch is about the same as the Avon. However it depends on how it's measured. They are readily available last about twice the time, and they are half the price.

Sounds like it might be worth trying again Ed.

I'm almost certain the 13" version is illegal, I would speak to Ian first as this saves people getting upset when their told the tyres are illegal and they have to change them. As far as I'm aware there's only the avon and Dunlop green spot available for 13" in the crmc obviously abroad is a different matter.

You perfectly correct Jason. However the same tyre fitted on a 10" or a 12" rim (as the Roeburys run) if perfectly within the club rules. So if it's wet and you have 13" rims you are at a disadvantage.

You are right Jason. This was discussed at length at the AGM about 3 years ago. They have been allowed on the P4 bikes though.

Sorry Mike, highjacking your thread here.

Fitted Yokos today Cant see why not legal with CMRC because of the radius on the edges there is LESS contact patch The only thing I can think is they work in a different way to the Avon and roll in corners to get contact Also there rolling radius is 12mm smaller than Avon not that this makes any difference.

mrequipe wrote:Fitted Yokos today Cant see why not legal with CMRC because of the radius on the edges there is LESS contact patch The only thing I can think is they work in a different way to the Avon and roll in corners to get contact Also there rolling radius is 12mm smaller than Avon not that this makes any difference.

Mike, I mentioned the contact patch to crmc officials and their reply was that it was wider than 5.5" so how they come to that conclusion i don't know.I have rolled a 13" Yoko pumped up on a wheel ,I inked the tyre and it didn't exceed 5.5 , but they still wouldn't allow it.

The problem was due to the fact that it didn't fit through the frame device that Ian inherited from his predecessor due to the bulge of the tyre wall (or maybe the roll you mention Mike).

Makes sense to allow them if it is a cost saving and the contact patch is within limits.

John, I seem to remember you mentioning that you had done a footprint of the contact patch that had proved in was within limits?

well iv'e run yoki's since we built the bike and don't intend to do crmc meeting's ,but to ban something that is cheaper ,better,last's longer,and also avaible in 3 compound's just dos'nt make sense ,there again iv'e only been doing it for 45 year's so what do i know??

Your right Dick you know F all lol. How you doing.

That remark of yours deserves a "like", Geoff! Dick, stop grizzling and get over here to show us what you know about beer...

steady folk's iv'e got feeling's!!,yes helen it's getting longer since i tried the okell's really must try too get over sometime ,give me love to the fairie's.