i have just finished building up my first bike, and in doing so put myself through bike mechanic school. my question has multiparts.
Gearing: is 39X13 (on a 53/39 front and 12-25 rear) considered a crossover gear. one LBS guy says yes. the reason for this question is this, when i'm in the aforementioned gear my chain rubs the side of the 53 chainring making an irritating noise. at first i thought it was the chain rubbing the front derailleur but after adjusting the F/D i determined it was in fact the chain rubbing the chainring. so my next step was to move the entire rear cassette closer to the wheel with a thinner spacer. after some research it seems that i have the thinnest spacer available. my next thought was that i could take the current spacer to a machine shop and have them shave it down a tiny bit and make it thinner. but, if 39X13 is indeed a crossover gear, i just won't bother. i hope this makes sense.
if it makes any difference i'm riding a 58 soloist team, w/ ultegra.
thanks for any and all input. this is my first post here, been hanging around for quite some time reading...
Gearing: is 39X13 (on a 53/39 front and 12-25 rear) considered a crossover gear. one LBS guy says yes. the reason for this question is this, when i'm in the aforementioned gear my chain rubs the side of the 53 chainring making an irritating noise. at first i thought it was the chain rubbing the front derailleur but after adjusting the F/D i determined it was in fact the chain rubbing the chainring. so my next step was to move the entire rear cassette closer to the wheel with a thinner spacer. after some research it seems that i have the thinnest spacer available. my next thought was that i could take the current spacer to a machine shop and have them shave it down a tiny bit and make it thinner. but, if 39X13 is indeed a crossover gear, i just won't bother. i hope this makes sense.
if it makes any difference i'm riding a 58 soloist team, w/ ultegra.
thanks for any and all input. this is my first post here, been hanging around for quite some time reading...