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Is facing the bottom bracket of ur frame to fit an external BB necessary,i'd say it is but a local bike shop says not....? 🙄
I've never done it and the world (and my cranks) has kept turning.
only mincers face bb shells. Real men install bottom brackets with hammers aswell.
Depends - I'd say for most BBs it's unnecessary, but some BBs are fussy and have flexy cups so worth doing with them.
So this isn't a thread about sex etiquette with ugly people then?
brown paper bag is standard Tucker, with a drawn on face of Kylie or Bradm depending on which way you dangle!
One bag, two bags, jackdaw surely?
Anyway - I'm sure someone, bencooper? has done some analysis on bearing angles and tolerances and the answer is no.
Depends if you're happy that the faces are parrallel or not.
LBS' love to try and convince you that your bb shell needs facing coz they charge huge sums for the pleasure. My guy reckons it's because it costs him a bob or two to get special tool sharpened and it needs doing every time, which it may do but he wants 60 quid to face it, come on!!
If it really is necessary we should probably be looking at some sort of mass law suit for the sale of unfit-for-purpose bikes.
Personally I can see it being possibly worthwhile with a really wonky bike, poor paint etc. But I'm about 50/50 faced/unfaced, if there's a difference it's one that makes no discernable difference.
If you have a crank where a bolt pulls the 2 halves of the crank together, such as a race face one, then it's pretty important that the BB shell width is fairly precise, or you can overstress the bearings.
With a shimano crank it doesn't really matter as it has a bit of flexibility built into the design to cope with small differences in the BB shell width.
I would say it only needs facing if the frame has a lot of paint on it that looks rough or the width of the shell is out.
generally its not a desperate necessity