Threadless Bottom Bracket
The Grand Cru Threadless bottom bracket is designed to put that frame with stripped or unknown threading back on the road.
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.
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, a pin wrench, or the Park BBT-9. The BB shell does not require chamfering or facing; simply slip the BB into the shell and tighten.
Note: not compatible with modern "Press-Fit" designs as the dimensions are completely different.
I was not able to get this working in a 2009 Surly Long Haul Trucker with damaged threads. The expanding cup system was far too tight to even get the drive-side in initially. If you watch the instructional video, you can see he simply presses the drive-side in with his hand. If you are not able to do this with some light coercion, you may have to send it back before you get too far into trying to wrench it on. That said, I rate the product highly because VO answered my emails trying to get it going and also took my return when it wouldn't. I have lots of VO components on my bikes and this the first part of theirs I didn't love, so it means a lot that they stood by it.
Back up and riding my 1973 Schwinn World Voyageur