100/90/10

We normally use 100/90 tyres on the rear to give a bit more width. This helps with drive around corners, and a bit more stability. You could also us a wide rim to achieve similar results. We would not advise using wide tyres and wide rims on the rear unless you are extremely careful. The inside of the tyre could possibly rub on the inside of the engine cases. This might not be visible straight away. but with added weight or loss of tyre pressure it could be become a real issue.