Grand Cru Threadless Bottom Brackets fit most frames, even those with Swiss threading, and they work on frames with damaged BB shells, even if the existing threading is totally stripped.
Unlike previous attempts at threadless BBs, this new design is "internally expanding". As the adjustable cup is tightened, the silver sleeve (see photo) is pushed up the tapered alloy cups, expanding and locking in the BB. This differs from older designs, like the Mavic, that pressed in from the outside and would sometimes slip. Installation requires only a traditional-style BB spanner or a pin wrench. The BB shell does not require chamfering or facing; simply slip the BB into the shell and tighten. It is easily removed and existing threads may be reused.
Like the other Grand Cru BBs, these have sealed cartridge bearings so they require no servicing and should have a very long life. Taper is JIS. So far, we have tried these on British, French and Swiss BB shells and they work perfectly. Customers report that they also work in Raleigh frames with a 71mm wide BB shell. These BB's won't work on mountain bikes, as their standard width (73mm) is too wide for the shell to expand. They do not work on Italian threaded BB shells because those have a wider ID.
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Beautifully made and cheaper than any alternative
My frame's driveside threads wore out so I started to investigate resolutions. It's only real value is sentimental and all of the framebuilders options were very expensive so I researched threadless BBs instead. I settled on the velo orange after reading a load of reviews and have to say its worth everything good written about it. Not only does it not look amazing it doens't damage the threads that are left so if one day I want to get it recut with new steal inserted I can. I'd say the ride is smoother than the UN 55 I had in there before! On top of all this I ordered the wrong spindle length by accident and Josh was super speedy in replying to me and sorting it for me. If you need a threadless BB for any reason look no further.