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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Tyres - blowouts, causes and how to avoid them?
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<blockquote data-quote="Simon Dinsdale" data-source="post: 6295" data-attributes="member: 58"><p>Stuart,</p><p>I had a rapid blowout of the rear tyre on my Rap 14 years ago. This occured at 70mph in the centre lane of the M5 heading for the Severn rally. The bike was 2 up (2 adults) and fully loaded with camping gear. I managed to get to the hard shoulder and down to 30mph before we came off. Also the weather was hot and sunny.</p><p></p><p>The tyre was a Dunlop TT100 and around 1500 miles and 6 months old. The tube was a good quality and new with the tyre. The eventual cause after much investigation was found to be due to running the tyre at 26psi which was too low!!!! but still higher than the old recomendations. This would allow the tube to rub on the flexing tyre and along with the weight on the tyre and the hot weather most probably caused the tube to overheat and fail.</p><p></p><p>Dunlop recommended to me for the weight of the bike and my weight etc to run on the REAR tyre at 30psi when solo and 36psi when 2 up and fully loaded with camping gear. I have followed these figures (for the rear) and have had no other problems.</p><p></p><p>What I do is to load up the bike, sit on it and look at the tyre deflection / distortion. What Dunlop suggested causes a slight deflection and this is what I aim for.</p><p></p><p>Tyre pressures on old bikes is a minefield as even the original style tyres which are made today are made from different (softer?) compounds to the 1950's therefore I suggest you do your own investigation and don't take the figures above as correct, but also don't take the 1950's Vincent figures as correct either as they would have been for tyres made in the 1950's.</p><p></p><p>Regards,</p><p>Simon.</p><p></p><p>P.S. The above works for me but as a disclaimer, do not take above as correct, but do your own investigation into tyre pressures.</p></blockquote><p></p>
[QUOTE="Simon Dinsdale, post: 6295, member: 58"] Stuart, I had a rapid blowout of the rear tyre on my Rap 14 years ago. This occured at 70mph in the centre lane of the M5 heading for the Severn rally. The bike was 2 up (2 adults) and fully loaded with camping gear. I managed to get to the hard shoulder and down to 30mph before we came off. Also the weather was hot and sunny. The tyre was a Dunlop TT100 and around 1500 miles and 6 months old. The tube was a good quality and new with the tyre. The eventual cause after much investigation was found to be due to running the tyre at 26psi which was too low!!!! but still higher than the old recomendations. This would allow the tube to rub on the flexing tyre and along with the weight on the tyre and the hot weather most probably caused the tube to overheat and fail. Dunlop recommended to me for the weight of the bike and my weight etc to run on the REAR tyre at 30psi when solo and 36psi when 2 up and fully loaded with camping gear. I have followed these figures (for the rear) and have had no other problems. What I do is to load up the bike, sit on it and look at the tyre deflection / distortion. What Dunlop suggested causes a slight deflection and this is what I aim for. Tyre pressures on old bikes is a minefield as even the original style tyres which are made today are made from different (softer?) compounds to the 1950's therefore I suggest you do your own investigation and don't take the figures above as correct, but also don't take the 1950's Vincent figures as correct either as they would have been for tyres made in the 1950's. Regards, Simon. P.S. The above works for me but as a disclaimer, do not take above as correct, but do your own investigation into tyre pressures. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Tyres - blowouts, causes and how to avoid them?
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