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so got an old road frame off a nice guy on here last week and it was due to be at the powder coaters just now but i have not been able to get the BB out of it yet and its seriously doing my head.
so its an old steel road frame.....isis style bottom bracket got the proper tool and the non-drive side came away quite happily but the drive side will not budge.
ive attacked it with GT85 and put every inch of strength into trying to get it out but nowt, part of the problem seems to be that the spline on the cup are really short so it really hard to get the tool to stay in place, i thought about putting a QR through the BB and trying to calmp it in place but its not hollow so cant get it though
Any suggestions?
perhaps a drop of heat
Get some heat onto it. The expansion of dissimilar metals will aid you getting it off. Pour boiling water slowely over it to start with then give it a go. If its going to the coaters anyway you could move up to heat gun / blow torch. Wear gloves and it should come out. Its never failed for me.
G clamp over the tool and the other side of the bb, cover witha piece of wood then use spanner on tool
Find yourself a suitably sized washer, then bolt the tool to the BB using the crank bolt. Then clamp the tool in a nice solid vice and use the frame as a lever. If that don't work, you're into melting territory 🙁
I'm trying to picture it..
As above, try a heat gun if you can get hold of one.
If not, you can hold the BB tool into a vice on a very solid bench..and use the bike as leverage to undo the thread. This method worked for me on a previously stuck BB.
make sure youre undoing it.
drive side clockwise to remove
mmmhhh dont own a heat gun or a vice haha, ive got a couple of G clamps but non are big enough to cover the tool and the spindle of the BB
I'll try the boiling water idea and i can try the washer and crank bolt idea
Are BB's reverse thread at all? Turning it the right way? I got confused with a pedal thread once and in trying to remove it tightened the thing up so much I can't get it off now. I have an spd one side and a flat the other.
What's the cup made from?
Is it aluminum/alloy (I know steel s an alloy as well, but can we let it slide this once?) if it is, it's probably fused.
You can try pouring coca-cola or household ammonia into the bb shell. That should free it up.
Ammonia worked for a very stuck seatpost a few years back.
Longer lever - I use an old Brompton Seatpost over the spanner to get plenty of oomph to shift tight stuff.
Heat (or cold on the inner part) also helps. A C02 cannister down a quill stem helped shift it from a headtube after normal efforts failed recently.
Tool in a vice, use the frame as the lever.
its an alloy cup on a steel frame, the non drive side was plastic, the drive side of a BB is normally reverse threaded i checked that so have been turning it the right way
another good shout about the coca-cola, i dont know where id get ammonia??
enduro-aid - Member
its an alloy cup on a steel frame, the non drive side was plastic, the drive side of a BB is normally reverse threaded i checked that so have been turning it the right wayanother good shout about the coca-cola, i dont know where id get ammonia??
POSTED 48 MINUTES AGO # REPORT-POST
You can buy it from any hardware shop, the kind with buckets and mops and stuff hanging outside. It's pretty nasty stuff though do it outside. You'll have to leave it over night but it really does work.
😳 double post 😳
if you're able to bolt the tool in place and don't have a bench vise, a piece of steel pipe (like a 4ft bit of scaffolding or similar) could be useful, slipped over top of a crescent wrench or socket wrench.
i just removed an old sq. taper this way a coupla days ago. it was so fixed in situ that i needed that extra leverage to get it most of the way out...
I used a TACX BB tool which screws into the BB axle, plus a foot long spanner to shift a Shimano UN-72 that had been in-situ for a long time. Not sure if the TACX tool would fit ISIS cups though.
[url= http://www.chainreactioncycles.com/Models.aspx?ModelID=75834 ]This sort of thing[/url]
Bolting the tool into the BB is a must.. If you mash up the splines then it'll make the job twice as hard. Putting a ring spanner or 2 behind the tool should give the bolt something to press against.
Then go and find someone with a suitably bolted down bench vice, clamp the tool in it and think twice about the direction before you start levering on the frame!