I ride some VERY tight, steep single track in Mexico, while on the same day I will ride wide open graded dirt roads. I found that going two teeth bigger on the rear sprocket was a better option than one tooth smaller on the front sprocket. I changed my rear sprocket after the first 100 miles on the bike. A smaller front sprocket is hard on the chain (too much of a bend). One tooth smaller on the front equals four teeth bigger on the rear sprocket and is really overkill in my opinion. I went with a Yamaha
rear sprocket, after I was surprised to learn that the price for OEM
was the same or cheaper than after market (there is a "good guy" discount figured in this equation"). I washed my bike last night after a hard weekend ride in Mexico. I checked out my chain after I cleaned and lubed it. After 3,000 miles of riding the original chain and sprockets, there is no visible hooking on the OEM
sprockets, which I think is impressive. When or if my chain and sprockets wear out, I definitely will replace them with the same brand of chain and OEM sprockets. Just my opinion.