Sugino RD2 chainline
#1
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Sugino RD2 chainline
so here's a new one for ya'll... and yes that is sarcasm you detect...
i recently bought a track frame with a sugino RD2 touring crank (has bolts on the inside for the granny gear) attached to what i believe to be a sugino 103 BB. this combination is reported to give one a 45mm chainline when the chain ring is on the outside of the spider (as it currently is).
i'm running this with a formula track hub, dura ace cog + lock ring which i assume to give me a chain line of ~42mm.
3mm difference is not something i'm really into, and while the chain line is pretty quiet, it's not that morbid silence i demand.
so for starters, i tried moving the chain ring (48t, 1/8") to the inside of the spider, but no such luck: the chain ring rubs against the chain stays.
Ideally, i'd like a perfectly straight chain line, but i'm willing to settle for 1-2mm difference between the ring and the cog.
options for achieving this include a 107mm BB with the chainring on the inside of the spider, redishing the wheel to change the chainline (would really rather avoid this), spacing the rear sprocket (is that a terrible idea?), or perhaps just a smaller chainring (44t? 42t? will this provide enough chain stay clearance?)
I'm willing to shell out some $$ to make this happen (perhaps for a new BB) but i'd like to keep the process relatively inexpensive.
So! What do ya'll think is the best option?
anything i've overlooked that could solve this easily?
thoughts? opinions? **** talking cause it's moronic for the RD2 to have a 45mm chain line?
thanks for your help!
i recently bought a track frame with a sugino RD2 touring crank (has bolts on the inside for the granny gear) attached to what i believe to be a sugino 103 BB. this combination is reported to give one a 45mm chainline when the chain ring is on the outside of the spider (as it currently is).
i'm running this with a formula track hub, dura ace cog + lock ring which i assume to give me a chain line of ~42mm.
3mm difference is not something i'm really into, and while the chain line is pretty quiet, it's not that morbid silence i demand.
so for starters, i tried moving the chain ring (48t, 1/8") to the inside of the spider, but no such luck: the chain ring rubs against the chain stays.
Ideally, i'd like a perfectly straight chain line, but i'm willing to settle for 1-2mm difference between the ring and the cog.
options for achieving this include a 107mm BB with the chainring on the inside of the spider, redishing the wheel to change the chainline (would really rather avoid this), spacing the rear sprocket (is that a terrible idea?), or perhaps just a smaller chainring (44t? 42t? will this provide enough chain stay clearance?)
I'm willing to shell out some $$ to make this happen (perhaps for a new BB) but i'd like to keep the process relatively inexpensive.
So! What do ya'll think is the best option?
anything i've overlooked that could solve this easily?
thoughts? opinions? **** talking cause it's moronic for the RD2 to have a 45mm chain line?
thanks for your help!
#5
Gentlemen.
Joined: Jun 2008
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From: Chico, CA
Bikes: S-Works e5 Aerotech with 2009 Veloce and a Fulcrum 5s
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#10
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Joined: Sep 2009
Posts: 354
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Bikes: team miyata, '73 p-14, MB-3, centurion lemans, Mystery TT, mongoose atb '85
so here's a new one for ya'll... and yes that is sarcasm you detect...
i recently bought a track frame with a sugino RD2 touring crank (has bolts on the inside for the granny gear) attached to what i believe to be a sugino 103 BB. this combination is reported to give one a 45mm chainline when the chain ring is on the outside of the spider (as it currently is).
i'm running this with a formula track hub, dura ace cog + lock ring which i assume to give me a chain line of ~42mm.
3mm difference is not something i'm really into, and while the chain line is pretty quiet, it's not that morbid silence i demand.
so for starters, i tried moving the chain ring (48t, 1/8") to the inside of the spider, but no such luck: the chain ring rubs against the chain stays.
Ideally, i'd like a perfectly straight chain line, but i'm willing to settle for 1-2mm difference between the ring and the cog.
options for achieving this include a 107mm BB with the chainring on the inside of the spider, redishing the wheel to change the chainline (would really rather avoid this), spacing the rear sprocket (is that a terrible idea?), or perhaps just a smaller chainring (44t? 42t? will this provide enough chain stay clearance?)
I'm willing to shell out some $$ to make this happen (perhaps for a new BB) but i'd like to keep the process relatively inexpensive.
So! What do ya'll think is the best option?
anything i've overlooked that could solve this easily?
thoughts? opinions? **** talking cause it's moronic for the RD2 to have a 45mm chain line?
thanks for your help!
i recently bought a track frame with a sugino RD2 touring crank (has bolts on the inside for the granny gear) attached to what i believe to be a sugino 103 BB. this combination is reported to give one a 45mm chainline when the chain ring is on the outside of the spider (as it currently is).
i'm running this with a formula track hub, dura ace cog + lock ring which i assume to give me a chain line of ~42mm.
3mm difference is not something i'm really into, and while the chain line is pretty quiet, it's not that morbid silence i demand.
so for starters, i tried moving the chain ring (48t, 1/8") to the inside of the spider, but no such luck: the chain ring rubs against the chain stays.
Ideally, i'd like a perfectly straight chain line, but i'm willing to settle for 1-2mm difference between the ring and the cog.
options for achieving this include a 107mm BB with the chainring on the inside of the spider, redishing the wheel to change the chainline (would really rather avoid this), spacing the rear sprocket (is that a terrible idea?), or perhaps just a smaller chainring (44t? 42t? will this provide enough chain stay clearance?)
I'm willing to shell out some $$ to make this happen (perhaps for a new BB) but i'd like to keep the process relatively inexpensive.
So! What do ya'll think is the best option?
anything i've overlooked that could solve this easily?
thoughts? opinions? **** talking cause it's moronic for the RD2 to have a 45mm chain line?
thanks for your help!

how many teeth on your cog? maybe switching down to a 42t chainring will give you enough clearance?
#11
Full Member
Joined: Sep 2009
Posts: 354
Likes: 0
Bikes: team miyata, '73 p-14, MB-3, centurion lemans, Mystery TT, mongoose atb '85
oh, it's an RD2...
Last edited by chi-james; 12-09-09 at 03:44 PM. Reason: reread op
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