MORE TYRE TIPS

Real Classic - - Kawasaki-triumph Special - RichardW

I was in­ter­ested in the let­ter about tyre age and per­for­mance in RC176, which made some very good points. How­ever, it mis­rep­re­sented how a tyre grips the road and how the co­ef­fi­cient of fric­tion works. The co­ef­fi­cient of fric­tion is in­de­pen­dent of sur­face area and speed of con­tact, so it’s in­cor­rect to bring tread pat­terns into the ar­gu­ment.

Tyres grip the road by ‘mould­ing’ to the sur­face. They grip bet­ter on a rough sur­face and less so on a smooth sur­face. This means that tread does ac­tu­ally re­duce grip, but only in per­fect con­di­tions, dry and smooth. It be­comes of great ben­e­fit in its abil­ity to move wa­ter out of the way. So hard old tyres are bad be­cause they are un­able to mould to the sur­face. Bald tyres are bad in all ex­cept per­fect dry con­di­tions. Jerry, who wrote the let­ter, is right about fit­ting new tyres but it’s not a per­fect world – good ad­vice though.

Now what about mix­ing fork oil: do equal quan­ti­ties of 10W and 20W make 15W or is the 20W still 20W? Dis­cuss!

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