hi, i know there's a bit of stuff on this topic already in the archives
and on sheldon's website (very helpful!), but i wanted to double check
to see what recommended options are.
i have an old road bike converted to a fixie. it's spaced at 126mm. i'm
using the smaller chainring, on the inside of the spider. this measures
out at maybe a tad over 41mm. (it's hard to get super precise, b/c it's
hard to know where, exactly, the "middle" of the seat tube is.)
the rear wheel is a formula flip-flop hub, with a dura-ace cog &
lockring. per my own measurements and per the info on sheldon's charts,
it sits at 43mm.
thus, i have the cog outboard of the chainring by somewhere between
1.5-2mm. not a lot, but probably worth resolving, seems to be the
consensus.
so what are my options? i would like to avoid having to re-dish the
wheel/replacing the BB if possible. i want to keep it cheap, and i
don't know how to re-dish the wheel mysel (every time i touch a spoke
wrench, it's bad news for the wheel.) can i simply put a 2mm spacer in
behind the locknut on the drive side and be done with it? do i need to
put a spacer in on both sides? or would it be better (or
possible/advisable?) to get the LBS to put in a spacer on the BB so
that the chainring sits out 2mm further?