Hi all.
I'm just about to build up my 1st Ti frame but i'm a little unsure what I should use on the threads (if anything), to preven the alloy BB cups from binding?
It's a TA square taper BB - not that it should make any difference.
Cheers
Steve
copper-slip is the best bet, and don't leave it in too long, check it every 6 months or so just to be sure it's not seizing.
coppa slip is the worst thing you can use - copper is electroconductive and will [b]increase[/b] electrolytic bonding between your threads.
Various places have tubes of 'Ti prep'. Or you can go to a motorfactors and buy a tub of 'moly grease' (molybednum grease) which is perfect and v cheap.
I thought ti-prep was copper based? I guess every day is a school day after all.
I use copperslip on the ti commuter and I've had no issues, and that's with riding it all through winter.
Is this a theoretical 'worst thing' ADH or do people actually have problems using copperslip?
Here we go again....
Ti-Prep is designed for this application.
It contains copper
Go figure
..planning for worst thing, as james-o suggests, I [i]try[/i] to remember and regrease bb threads every few months - doesn't take long and can save a lot of grief. As with the seatpost area, the bb is hit by a lot of water.
Ti-Prep is designed for this application.It contains copper
Go figure
Oh well, that's me told I guess.
Is this a theoretical 'worst thing' ADH
Barely a month goes past without a thread 'HELP! Aluminium thing [i]really[/i] stuck in Ti thing!' appearing.
the bb is hit by a lot of water.
Water?: Ti unreactive, ally unconcerned.
uh oh.. sorry i meant ti-prep, i use finish line ti-prep - but i thought it was same as copper slip.
will look into it, if anyone knows it'll be the chemist guy at finish line.
"Water?: Ti unreactive, ally unconcerned"
yes but it's saline solution on roads in winter, it's salt that seems to cause the issues. but i'm no chemist!
Thanks guys. I'm not sure if that last thread from a few months ago ended with any conclusion 🙂 .
Anyway, the bb is now in the frame and I used some copper slip. I'll take it out again in a couple of months to make sure it isn't welded solid - Obviously unless it sets solid within that time.
"coppa slip is the worst thing you can use"
Where does this come from?
Ti prep and copper slip, are just like the brake fluid they sell for £8 for 200ml in bike shops.
Its the same thing in a different packet.
Any grease or oil will stop your alloy cups from seizing in your frame. The question is how long will it last before it washs away?
The answer is to take it apart again and have a look after a few months.
Also if the cups spin up easy then stop at the ends of the threads basically by hand pressure, try a turn of PTFE tape towards the outsside of the Cup. This will help to stop water passing through the threads.
PTFE plumbers tape a couple of times round the BB cup, and a little grease.
[i]Any grease or oil will stop your alloy cups from seizing in your frame[/i]
This.
it's salt that seems to cause the issues
IME salt means the parts never dry(unless warm, i.e. in a house) and so parts corrode more quickly.
