clearance

Hey guys! About to purchase a supermoto setup for my 2008 CRF250R with Dual Exhaust. Any recommendations for size? 5 or 4.25 inch rear rim? Also will a 160 size tire hit the factory dual exhaust? Sorry if this issue has been answered before. Thanks!

hi so in the middle of rebuilding my engine, come to checking the clearance between the vales and the cams. one problem one of the intake clearances are wrong, there is no clearance between the valve and the cam. the shim that is in the valve at the moment is 2.90 looking on the service manual...