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Waking Up A Sleeping SB6R
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Evilchicken0



Joined: 12 May 2010
Posts: 2943
Location: London

PostPosted: Thu Oct 31, 2019 8:40 pm    Post subject: Reply with quote

It's not the tyre size when it's cold it's the hot dimension that matters
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Jaguar



Joined: 15 Sep 2017
Posts: 133
Location: Albany NY

PostPosted: Fri Nov 01, 2019 1:29 pm    Post subject: Reply with quote

100% agree.

I ended up ordering the 180/55
Figure it means that the Monster S4 and the Bimota will run the exact same brand and size tires. Should make serving/buying parts easy.
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Bud977



Joined: 03 Mar 2013
Posts: 431
Location: Sydney

PostPosted: Fri Nov 01, 2019 9:12 pm    Post subject: Reply with quote

Evilchicken0 wrote:
It's not the tyre size when it's cold it's the hot dimension that matters


?? What did you mean there? Tyre dimensions don't change from cold to hot.
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Evilchicken0



Joined: 12 May 2010
Posts: 2943
Location: London

PostPosted: Sat Nov 02, 2019 2:17 pm    Post subject: Reply with quote

Bud977 wrote:
Evilchicken0 wrote:
It's not the tyre size when it's cold it's the hot dimension that matters


?? What did you mean there? Tyre dimensions don't change from cold to hot.


Really ???
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Bud977



Joined: 03 Mar 2013
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PostPosted: Sat Nov 02, 2019 9:25 pm    Post subject: Reply with quote

There is probably some imperceptible change due to the rubber molecules heating up, but in my 40 years of racing, I've not come across anyone talking about tyres changing dimension when hot.

Heating up the tyre is similar to increasing pressure. Pump up a tyre to 100 psi that is made for 30 psi and it will not perceptively change its dimension.
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GeeKay



Joined: 29 May 2009
Posts: 1744
Location: West Yorkshire

PostPosted: Sun Nov 03, 2019 10:42 am    Post subject: Reply with quote

beg to differ but when I fitted a rear hugger to my TL1000S it (just) cleared the tyre ok. First run out and it was scrubbing on the rear tyre.

Also, if my trials bike rear tyre is flat (slow puncture) it catches on the side-stand bracket bolt. If I put 5psi in it, it clears it.
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Bimota SB6 and Benelli TNT 899S road bikes.
Beta Techno trials iron. Project bikes:- Suzuki V4 500, TS185 cafe racer, XR11/71, Kettle/Katana, TDRGV250, OR50, Gag125,Triumph T595 and a Triumph X75 Hurricane replica.
Too many projects...............
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Bud977



Joined: 03 Mar 2013
Posts: 431
Location: Sydney

PostPosted: Sun Nov 03, 2019 8:54 pm    Post subject: Reply with quote

Tyres grow in circumference at speed due to centrifugal force. That is why your tyre hit the hugger.

And of course a flat tyre is a different shape to an inflated tyre. That is not related to heat.
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Bud977



Joined: 03 Mar 2013
Posts: 431
Location: Sydney

PostPosted: Sun Nov 03, 2019 8:58 pm    Post subject: Reply with quote

You can easily test if tyres will change dimensions with heat using a set of tyre warmers.

Measure the overall height and width when cold, heat the wheel using your tyre warmers, which are usually around 80C, and then re-measure. Let me know the results.
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Gammaboy



Joined: 25 Feb 2016
Posts: 182
Location: Brisbane, Australia

PostPosted: Mon Nov 04, 2019 1:02 pm    Post subject: Reply with quote

Bud977 wrote:
You can easily test if tyres will change dimensions with heat using a set of tyre warmers.

Measure the overall height and width when cold, heat the wheel using your tyre warmers, which are usually around 80C, and then re-measure. Let me know the results.


Bit different when the tyre is turning at 160mph!
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Bud977



Joined: 03 Mar 2013
Posts: 431
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PostPosted: Mon Nov 04, 2019 8:01 pm    Post subject: Reply with quote

That's right. That's centrifugal force, not heat.
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Evilchicken0



Joined: 12 May 2010
Posts: 2943
Location: London

PostPosted: Wed Nov 06, 2019 7:50 am    Post subject: Reply with quote

Everything gets bigger with heat and rubber will get softer as a result. It's just something you should be aware of
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Bud977



Joined: 03 Mar 2013
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PostPosted: Wed Nov 06, 2019 8:33 pm    Post subject: Reply with quote

OK.
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