what does and 18 inch rear do for you?

I have a 1998 yz 400 f and was wondering what kind of difference it makes and what it does.

18"s are good for off road riding because of the taller sidewall, it helps absorb shock better and protect the wheels. If your just running tracks then stick to the 19.

I have a 19" practice wheel and then a 18" race wheel for hare scrambles and cross countries and find that the 18" is only better when sidehilling over roots or rocks. There is not a huge difference, the 19" does skip around more over small roots and rocks though. If you get a 6 ply tire like a kenda 257, you can run 8 psi and this helps absorb small bumps/hits and won't pinch flat

Because of more sidewall it makes it harder to pop tire tube. Peformance wise there's not a big difference as far as I can tell.

Peformance wise there's not a big difference as far as I can tell.
For trail riding there probably isn't. On the track, though, you can definitely feel the extra weight of the 18" tire.

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