Over-inflation of your motorcycle’s tyre is far less of an issue than underinflation.
Of course, it all depends on how much you overinflate your tyres. A few psi won’t make any noticable difference on a road tyre but if it’s designed to be running 30psi and you put 60psi in, you’re inviting disaster. It’s unlikely that this pressure will cause the tyre to fail, it’s unlikely to pop off the rim and the valve probably won’t get ejected from the rim either but it’ll be detrimental to the way the tyre is designed to work and to the bike’s handling.
A tyre requires a certain amount of give in the carcass in order for the tread to find grip and for the rubber to spread into the road surface. An overinflated tyre won’t therefore warm up as evenly as a properly inflated tyre and the tyre won’t be able to deform as intended.
It’s likely that overinflated motorcycle or scooter tyres will cause the bike to run wide in corners and on a more powerful motorcycle, the rear will spin up under acceleration as the tyre struggles to find grip.
When you’re carrying a pillion or luggage it makes sense to add a few more psi into your tyres, in order to compensate for the additional weight
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