MacB
Lover of things that come in 3's
- Location
- Farnborough, Hampshire
I've been musing about what I'd like as a chainset and keep getting drawn to the idea of a super compact, partially inspired by Sheldons note about the 28/51 he ran. My thoughts so far:-
standard road triple chainset(130/74 bcd), bashguard in outer, 44t middle and 24t inner - running with a 9/10 speed 12-27 cassette
does it need a slightly longer BB to position the larger ring for better use of the bigger gears?
can you get a band on double FD that will cope with a 20 tooth gap? as far as I'm aware a double is a 16t capacity and triple a 22t, the FD itself should be able to be positioned a bit lower on the ST. Or could the shape of a triple FD be messed with a bit to do the job?
I'm guessing that this wouldn't play well with an STI shifter so was thinking of a bar end for front shifting only.
On a similar subject I'm hashing out details on the custom frame, one of the requirements was to match clearances to the forks I've got. This means up to 700x44 tyres with mudguards. My frame builder has come back to me indicating that there may be chainring clearance issues with this unless I run MTB chainsets or use square taper, with longer axles, for road chainsets. In theory I'm ok with this but three thoughts spring to mind:-
if I widen like this then a road FD won't reach so that means MTB FD and therefore definitely no STI for front shifting
q-factor(width distance between pedals) I have no idea what it is on my current bikes but keep reading that the narrower the better(would I even notice?). Exactly where is q-factor measured from and to? As in, is it inside of crank arm, where pedal attachs, to the same the other side, or is it from the outside?
rear shifting - by moving a chainset in/out are you not interfering with chainring to cassette chainlines? is there a chainline for a cassette to compare against? the bike will have 135 rear spacing if that matters.
Really I'm looking at a 1x9 or 1x10 combo here that has the bonus of a teensy granny ring for steep stuff.
standard road triple chainset(130/74 bcd), bashguard in outer, 44t middle and 24t inner - running with a 9/10 speed 12-27 cassette
does it need a slightly longer BB to position the larger ring for better use of the bigger gears?
can you get a band on double FD that will cope with a 20 tooth gap? as far as I'm aware a double is a 16t capacity and triple a 22t, the FD itself should be able to be positioned a bit lower on the ST. Or could the shape of a triple FD be messed with a bit to do the job?
I'm guessing that this wouldn't play well with an STI shifter so was thinking of a bar end for front shifting only.
On a similar subject I'm hashing out details on the custom frame, one of the requirements was to match clearances to the forks I've got. This means up to 700x44 tyres with mudguards. My frame builder has come back to me indicating that there may be chainring clearance issues with this unless I run MTB chainsets or use square taper, with longer axles, for road chainsets. In theory I'm ok with this but three thoughts spring to mind:-
if I widen like this then a road FD won't reach so that means MTB FD and therefore definitely no STI for front shifting
q-factor(width distance between pedals) I have no idea what it is on my current bikes but keep reading that the narrower the better(would I even notice?). Exactly where is q-factor measured from and to? As in, is it inside of crank arm, where pedal attachs, to the same the other side, or is it from the outside?
rear shifting - by moving a chainset in/out are you not interfering with chainring to cassette chainlines? is there a chainline for a cassette to compare against? the bike will have 135 rear spacing if that matters.
Really I'm looking at a 1x9 or 1x10 combo here that has the bonus of a teensy granny ring for steep stuff.