its sorted now, but......advise/comments welcome
I have a Marin Pine Mountain Mtb hardtail circa 1993/5
had no problems over the years and still had its original ch/set and BB. Been removed and refitted a few times over the years for cleaning and stuff natch
Recently decided to do a wee project and get it kitted out with disc brakes and a dyno bracket for a bit of expedition type trailer towing
Mounts fitted by R4 and his crew
Then decided that it needed a new(er) BB and ch/set
same brand shimano deore triple with bigger rings
All went to plan until fitting the crank side BB cup, which wouldn`t
after a bit of faffing about and wearing my thumb nail out tracing the thread start and direction of the new...and the old cups....bugger...diff er ent rotations
Never noticed before
So took a left, crank, cup out of another bike. Yep, same as new ch/set. + they have the direction arrows on
So also took the right, ch/set cup out and tried that. Okikdoki. put the donor parts back.
got onto CRC, very helpful, but unheard of situation so we were both left head and things scratching
Simple solution was to buy another BB51 assy: cheap enough at £7,
so now the Marin has 2 ch/set side BB cups fitted
BB shell is 67. summat on the vernier. didn`t bother with the summats `cos it was near enuff 68mm for me
I wiil know for future ref: but any ideas on why it is thus, who did what and why ?
Got the bike fully assembled from someone back in the mists of time in the Shipley/Otley area. Not Ellis Briggs.