How do I remove this slim lockring? It is on a 90s shimano BB. I have tried all sorts of wrenches, but it is hard to get a grip on this slim disk.
What do I do?
TIA
by malthevj
How do I remove this slim lockring? It is on a 90s shimano BB. I have tried all sorts of wrenches, but it is hard to get a grip on this slim disk.
What do I do?
TIA
by malthevj
15 Comments
It’s reverse threaded
It’s not a lockring, it’s a fixed cup.
It’s left threaded.
Take out the non-drive side first. Reach through to clean the fixed cup, and if it’s in good shape just leave it be.
If you do decide to replace it there’s a tool described by Sheldon Brown that uses a nut, bolt, and washers to get it out.
https://www.sheldonbrown.com/tooltips/bbcups.html
Get your flat headset/bb wrench on the flats and hit the other end with a hammer until it breaks loose.
That’s not a lockring, it’s the fixed cup. Take it apart from the other side. You don’t normally need to remove the fixed cup unless it’s damaged.
If you do need to remove it, clamp the flats in a large bench vise and use the frame for leverage, keeping in mind it reverse threaded.
Is that a Specialized Stumpjunper Comp?
It’s not a lockring, rather a one-piece cup that screws in until it stops.
Are you turning it the right way? BSA: drive side left hand thread, clockwise to loosen
Otherwise you just gotta find a 32mm wrench that fits well, and maybe use the crank bolts with something hollow in the middle to clamp it on (like large washers, or a cartridge BB tool or something.
Otherwise if you have the pieces, you can try Sheldon’s idea with a large bolt, nut and washers: https://sheldonbrown.com/tooltips/bbcups.html
Turn it sideways and lay it down in a vice, then close the vice down tight over the flat spots. After that turn the frame clockwise against the vice to loosen.
It is fiddly but generally works very well. Helps to have someone else to assist
heat and a wrench, remember it’s reverse threaded……
As anyone said its reversed threaded
Not a lockring that’s a fixed cup from a cup & cone BB, The adjustable cup & lockring are on the other side.
You need to remove the adjustable cup first then the axle and unscrew it ( reverse threaded ) but you will need the correct spanner and depending how tight it is a fair old bit of torque.
Correctly serviced ( usually no more than an occasion clean & regrease ) these things can go on forever.
It’s not stuck, it’s fixed!
Find someone who has one of these. It’s my favorite tool for old bikes!
https://www.hozan.co.jp/cycle_e/catalog/BB/C-358.html
From the same on the flats it looks like you might have been tightening it.
This side loosens when turned clockwise.
Efficient Velo tools makes a tool for that
I managed with paralel pliers, and turning the frame upside donw and then pressing donw with my bodyweight.
Pre soak it in WD40, and you can even remove the other side.