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Spindle length for proper chainline on a single ring(3 posts)

Spindle length for proper chainline on a single ringDan Q
Oct 7, 2002 4:37 AM
I am wondering how to gauge what BB spindle length I may need prior to purchasing the BB. I will have a Shimano 9 speed on the back and a single ring (44t) in front. Cranks are Dura Ace splined and the BB shell is 68mm. Shimano BB's only come in 109.5, 112.5, 118mm from what I can tell. I have seen that some cranks with a chainring guard on both sides require a 118mm spindle in order to gap the inner guard far enough from the chainstay. It seems that this would result in a poor chainline. Unless anyone has a good reason to, I will probably skip the guard on the inside. I know that chainline can not be determined exactly prior to setup, but given the relativley few spindle choices I thought one size may be an obvious choice. Thanks in advance.
re: Spindle length for proper chainline on a single ringatpjunkie
Oct 7, 2002 12:32 PM
the 118's have done pretty well in a single set up. Otherwise if you skip the inner ring the 112.5 should be okay. Also get a chain watcher (3rd Eye) if you go guardless on the inside.
I'm using 118mm spindle....SS_MB-7
Oct 7, 2002 3:12 PM
I'm using a D-A BB with 118mm spindle (meant for triple crank) woth a D-A double crank with the 42T ring mounted on the outside of the spider. The front chainline is 52.5mm. The rear chainline is 53.5mm with a Phil Wood rear flip-flop hub (135mm spacing) and Shimano 18T freewheel.

Ride Hard,
Mike B.