d_douglas
12-07-2017, 12:35 PM
I am using a Ritchey Logic 110mm triple crank on my disc CX commuter with a 38t Raceface NW ring. The ring is in the middle position and a chainguard is in the outer position. I needed to buy a new BB and went with advice of experienced shop to use standard JIS 113mm, but when I installed, there is maybe 9-10mm gap between crankarm and chainstay - too much.
This would mean that the chainline would be weird as well, as I eyeballed the ring lining up with the third cog on a Campy 10spd cassette.
Aside from trial and error (which the shop is willing to let me do) is there a formula to get the right chainline for this? If a 113mm was too wide, I would think a 103mm would work (10mm narrow, split between sides means 5mm closer to chainstay for the crankarms) That said, it seems extreme to put a 103mm BB on here.
I am just buying a UN55, so nothing fancy and the shop said I waswelcome to just exchange it for another last night when I bought it, so it is more a matter of expediency, as I don't want to go to 110mm / 107mm, then 103mm if I can avoid it.
Thanks for information, if you have any!!
This would mean that the chainline would be weird as well, as I eyeballed the ring lining up with the third cog on a Campy 10spd cassette.
Aside from trial and error (which the shop is willing to let me do) is there a formula to get the right chainline for this? If a 113mm was too wide, I would think a 103mm would work (10mm narrow, split between sides means 5mm closer to chainstay for the crankarms) That said, it seems extreme to put a 103mm BB on here.
I am just buying a UN55, so nothing fancy and the shop said I waswelcome to just exchange it for another last night when I bought it, so it is more a matter of expediency, as I don't want to go to 110mm / 107mm, then 103mm if I can avoid it.
Thanks for information, if you have any!!