What gearing ratio should I run on 300R?

[RUNMYTA]

What sprocket combo do you guys recommend for a XC/ GNCC type racing on my 89 R with a LRD 300 big bore, 36mm TMX, and few other goodies. I am running 20 in. RAZRS TIA MIKE:p

[CBW]

On my 310 with 20" tires i run stock gearing in the rear with a 14T on the countershaft..........

[wilkin250r]

Yeah, with a XC you definitly want to go taller. a 14/38 sounds about right. I'd go 13/36 for MX.