Bottom bracket with deep threads, Square taper or external

[The Kilt]

I picked up a Mk1 Santa Cruz Chameleon local to me for rather cheap as the BB was stuck in and he couldn’t get it out. So after some soaking with spray lube and vinegar, some heat around the BB, I manged to get it out.

I immediately saw the problem, it seems he or a previous owner had glued the bottom bracket in with some sort of weldite product, as the threads did not seem too great. I am going to pop down by LBS and get them to re-tap the thread to clean it all up, but I was wondering if there are any bottom brackets, either square taper or external hollowtec, with deep threads? I know some headsets come in extra deep (FSA and Chris King spring to mind) but I haven’t really seen anything for bottom brackets.
I knew this could be a problem, but for £25 it was a bargain!

 

[trailstar82]

I picked up a Mk1 Santa Cruz Chameleon local to me for rather cheap as the BB was stuck in and he couldn’t get it out. So after some soaking with spray lube and vinegar, some heat around the BB, I manged to get it out.

I immediately saw the problem, it seems he or a previous owner had glued the bottom bracket in with some sort of weldite product, as the threads did not seem too great. I am going to pop down by LBS and get them to re-tap the thread to clean it all up, but I was wondering if there are any bottom brackets, either square taper or external hollowtec, with deep threads? I know some headsets come in extra deep (FSA and Chris King spring to mind) but I haven’t really seen anything for bottom brackets.
I knew this could be a problem, but for £25 it was a bargain!

Was it the mango coloured one on eBay? I saw and missed the bidding on that. Glad someone on here picked it up though

 

[hamster]

Royce always seem to have deep threads to me. If it's the RHS, I would worry less about using a Shimano UN72 or similar as they have a nice shoulder to stop movement.

 

[pete_mcc]

Alternatively look for a BB designed specifically for damaged threads.

FRAME SAVER THREADLESS CARTRIDGE BOTTOM BRACKET BB CASSETTE FOR DAMAGED THREADS | eBay

DESIGNED FOR USE WITH STANDARD BSC BOTTOM BRACKETS 68mm SHELL LENGTH FOUND ON OLD OR NEW BIKES, RACERS, MTB'S TOWN, FOLDERS, KIDS ETC.

www.ebay.co.uk

mavic also made a nice one. You need to have the BB shell faced correctly to suit it. Just search ‘damaged threads bottom bracket’ for loads of options

 

[pete_mcc]

One for external BB

YST Threadless External Bicycle Bottom Bracket for damaged threads 24 &22mm sram | eBay

At last, a threadless bottom bracket with external bearings compatible with Shimano Hollowtech2 24mm and SRAM 22mm (with included adaptor) chainset axles. > Incldues an adaptor for use with SRAM 22mm axles.

www.ebay.co.uk

 

[eshew]

Fun times! Speaking of botched installs... had a FSR go through the garage with the Chris King headset JB Welded in. Took me a minute to figure out why it wasn't coming out.

 

[The Kilt]

Good news, the LBS re-did the thread and faced the BB, and the bottom bracket goes in there fine (Square taper) and seems to be holding pretty good. Will buidl it up and ride a few days and re-check to make sure everything is OK. If not i will go for one of the threadless BBs. Cheers all.