Hi All, I’m having an absolute nightmare swapping out a failed bottom bracket. I’ve tried to remove with a 22 spline BB Tool, and it’s going nowhere. It doesn’t feel like the tool fits particularly well, perhaps it’s just not a great tool. Took it too LBS and the guy seems to think I need another tool to engage at the lock ring at the edge. I can’t find a tool like that online. I’m reluctant to buy the park tool, and it still not work but I don’t really know what other options I have. I’ve added some pictures including the new BB I have for comparison
by joevose
3 Comments
I replaced mine recently and had the park tools one and it was still a bastard to get off. It does looks like that tool doesnt fit as snug, but the problem is that because the lip isn’t that deep you have to push it flat with one hand and turn with the other.
Also make sure you are turning the right way!
Also! Replace with the shimano metal one cos the plastic brompton ones aren’t great (mine had a crack in it which probably meant why it failed sooner).
Bottom bracket :
Park Tool BBT-22 will fit the Brompton bottom bracket, BB Cartridge JIS 119mm, Part No. Q100001.
The left side lock ring is removed by counterclockwise rotation and the force necessary can exceed 30Nm, because of stiction developed over time.
Because the left lock ring shows some damage in the picture, it is recommended to use a long M8x1.0 bolt 40 or 50 mm long (with washers) to hold the BBT-22 in place against the lock ring’s spline. Note the thread pitch is 1.0 mm, not the more common 1.25 mm that is usual on M8 bolts.
However, even better, use the Pedro’s BB Socket Holder II tool, https://pedros.com/products/bb-socket-holder-ii to hold the BBT-22.
After achieving loosening of the lock ring, it is recommended to leave the loosened ring in place and to break loose the right side of the bottom bracket, using the same process. Leaving the loose ring attached helps with alignment of the bottom bracket assembly as the bottom bracket right side is broken loose.
The right side (crankarm side) removal of the bottom bracket is clockwise rotation, when facing the Brompton.
Brompton Bottom Bracket Compatibility :
https://bromptonbikesdealers.my.salesforce.com/sfc/p/#8d000001EcDQ/a/8d000000pKE8/XXEpuSBovJdmLlLyHSVQ9C54x7vMnPvsThzsDYnhjvM
That is one of the ones I fear having to do myself. The amount of force and the potential damage to yourself and/or the bike … knowing my luck.
Betcha a bike shop can do that in 5 minutes (you’ve done all the rest of the work). With all the online videos the getting it back together is a lot easier.
So if that was me, knowing the importance of good tools, experience and the feeling on how to do this I would now drive to a bike shop during the week and tell them to undo it for like 10 Euro. … skip the big stores where you first need to hand over the bike to a receptionist.