I got another question....lol....my belt broke in my 66k, and I measured the circumfrence of the wheels with a peice of string and i came up with 68.89 inches. My question is, if I buy a length of belt that is 68 inches, (they are ebay) will this be ok? does the belt need to be a little bit smaller than the wheels so it can stretch a little? Sorry for the dumb question :-)