Well call me crazy , I HATED the 52 . Riding very tight , root invested single track . The 52 felt " JERKY " very hard to ride . I even had 2 other people ride it . They said its fine ?? ( BUT they NEVER rode the 50 tooth !) But then at Lunch I put the 50 on , and I was ALL over my buddy . He said " Let me ride that thing , " you are faster ". He came back and said WOW , its smoother with a taller gearing ?? 13/50 . Both friends rode bike on same trails 52 vs 50 and ALL 3 of us like the 50 BETTER ??? SO I am SOLD !! 13 /50 for ME !!!!!!! Thanks for all info and help . If you have never tried a 50 , maybe ya should ? We were ALL SHOCKED 2 teeth made that much difference . Was able to ride 2 and 3 rd with the 50 tooth .