Search results show lots of 13/48/50, 14/48/50 etc combos but didn't really see anything regarding leaving the 15 oem and just increasing the rear to a 48 or 50. I know it'd be easier to just change out the c/s sprocket but am pretty concerned about all the posts that mention eating away at the countershaft due to the hardened steel that is used to make the sprockets. I'd rather just change the rear sprocket than to gamble on having to install a shaft at the engine end due to excessive wear. Not concerned with having to ever exceed 60~ mph, just don't care for the 2nd gear in the trails feeling too high. 48 or 50? any recommendations out there? 50 too large in dia to fit without rubbing the C/S sprocket cover (oem). Chain guard is already removed.