I am going to replace my stock chain and was wondering how many links I would need for this sprocket combo 15/53. Im sure its somwhere between 110 and 120. 120 is too long as I found out last night when I tried to put the chain that I got from my dealer on last night I had the wheel the whole way back as far as it would go and it was still too long. 110 is probally too short so maybe a 115???