Clipless in Coeur d'Alene
Join Date: Mar 2012
Location: Coeur d'Alene, Idaho
Posts: 1,996
Bikes: Tandems: Calfee Dragonfly S&S, Ventana ECDM mtb; Singles: Specialized Tarmac SL4 S-Works, Specialized Stumpjumper Pro, etal.
Mentioned: 2 Post(s)
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Quoted: 164 Post(s)
I would not call this additional micro-thin washer a shim (ie it is not used as a spacer). If it was installed between the BB bearing cup and the tandem frame or the BB bearings and the crank spider, then it would be a shim. pOtAtO, pOtatO.
Anyway, the washer is only needed behind the stoker drive side spider lockring, and I assume only on this one crank side because it may have something to with the direction of crank force vs. the direction of the lockring threads that tends to work loose this one lockring. The 2 non-drive side cranksets rotate in the opposite direction, which may explain why no additional washer has been needed on these cranks to my knowledge - FWIW.
Yes, blue locktite should be used/re-applied on the lockring threads anytime the ring is reinstalled or retightened.
Sorry for the long delay in responding, I'm not in this forum much lately.
Last edited by twocicle; 12-10-23 at 10:31 AM.