Yet another BB Query. For the 74(?) Moto Champion Team(?). I'm riddling over the spindle length. This afternoon I will head over to the LBS to look for either a spindle or a French-thread UN55. Maybe I'll get some help here before I go.

68mm French BB. 5-speed FW. The plan is to use Nervar 631 (I think) crank arms paired to TA rings. The original crank may have been Campy Record, but that's a guess. So what length?

VerloBase has 4 Nerver 631-like entries; only one lists spindle length, 117mm.

As an experiment I've tried some BB cups and spindles from my stash. The only spindle I have that works is a Stronglight 120mm matching the Competition ref65 entry in VeloBase, marked "Marque Déposée". It misses the chainline by at least a cm too long on the right. Some of that miss might be due to length and some might be due to the taper.

The only other spindle I have is marked 3E (not 3N - I misremembered) but its bearing-bearing distance (measurement B) is too short for the cups I have. Sutherland's does say that the Stronglight B value is larger than normal, and perhaps I'm using Stronglight cups, which might explain why the other spindle doesn't work.

The only other data points from Sutherland's are cryptic length values for Nervar as 120 or 120.5mm.

Given that the chainrings are small (47-34) they have no problem with stay clearance. So I'm tempted to try a 115mm UN55. But this is all so fuzzy. Have any of you ever matched a UN54/UN55 to Nervar 50./4 arms? Any input would be appreciated.

Thanks!