Brian Bleech Posted July 11, 2007 Report Share Posted July 11, 2007 I remember reading ages ago about how to remove a leeson BB, but I can't find it. I think I remember that I will need some circlip pliers.So yeah... How do you go about removing an ISIS bb from a leeson frame? Thanks Quote Link to comment Share on other sites More sharing options...
boon racoon Posted July 11, 2007 Report Share Posted July 11, 2007 Well when Potts tried to do his and couldn't (we got the circlip out) we rang up Clive and he said that it's heated up and expanded when it's put in (tight tolerance) then cooled down.So it's basically wedged in?! And he said you'd need to heat the badboy (frame) up to get it out Quote Link to comment Share on other sites More sharing options...
Brian Bleech Posted July 11, 2007 Author Report Share Posted July 11, 2007 Well when Potts tried to do his and couldn't (we got the circlip out) we rang up Clive and he said that it's heated up and expanded when it's put in (tight tolerance) then cooled down.So it's basically wedged in?! And he said you'd need to heat the badboy (frame) up to get it out May have to borrow my dad's blowtorch Quote Link to comment Share on other sites More sharing options...
Rich Pearson Posted July 11, 2007 Report Share Posted July 11, 2007 We managed to get mine out the other day when I snapped off the shaft, and I will tell you now it is one of the most difficult and time consuming processess you can imagine.First of all some reverseable needlenose pliers are used to take the two circlips out. Now comes the tricky part; you need to heat up the BB using a blowtorch in order to break the seal of loctight compound which has locked the BB into the shell. After you've done that, its simply a case of whacking the b*****d out.We ended up having to put the frame in a vice so as one edge of the clamp was on the remaining axel arm, and the other pressed against a socket head which itself rested on the shell of the frame, and then hitting the vice with a hammer under high tension to shake it out. so you tighten it, give it a whack to loosen the BB's eal with the frame, and tighten it again, and repeat. And btw, it took me, Matt Tupman, Paul Curry and Andy pooley hanging our combined weight off a three foot leverage bar slotted over the vice's arm to push it out. Thats how hard those buggers are stuck in there.If you havn't got all that stuff then I'm sorry but the simplest way to do it is to send it back to Clive and let him work his magic.Hope that helps.Rich Quote Link to comment Share on other sites More sharing options...
boon racoon Posted July 11, 2007 Report Share Posted July 11, 2007 We managed to get mine out the other day when I snapped off the shaft, and I will tell you now it is one of the most difficult and time consuming processess you can imagine.First of all some reverseable needlenose pliers are used to take the two circlips out. Now comes the tricky part; you need to heat up the BB using a blowtorch in order to break the seal of loctight compound which has locked the BB into the shell. After you've done that, its simply a case of whacking the b*****d out.We ended up having to put the frame in a vice so as one edge of the clamp was on the remaining axel arm, and the other pressed against a socket head which itself rested on the shell of the frame, and then hitting the vice with a hammer under high tension to shake it out. so you tighten it, give it a whack to loosen the BB's eal with the frame, and tighten it again, and repeat. And btw, it took me, Matt Tupman, Paul Curry and Andy pooley hanging our combined weight off a three foot leverage bar slotted over the vice's arm to push it out. Thats how hard those buggers are stuck in there.If you havn't got all that stuff then I'm sorry but the simplest way to do it is to send it back to Clive and let him work his magic.Hope that helps.Richhahaha nice rich and i thought the extra wide bb and straight stays were meant to be a leeson perk Quote Link to comment Share on other sites More sharing options...
Christophe' Posted July 11, 2007 Report Share Posted July 11, 2007 hahaha nice rich and i thought the extra wide bb and straight stays were meant to be a leeson perk They are! Glad I put a heavy duty bb in now Quote Link to comment Share on other sites More sharing options...
Trials Punk Posted July 12, 2007 Report Share Posted July 12, 2007 Are there any BB's that are sold off the shelf to fit in the leesons?I'm guessing no but you never know. Quote Link to comment Share on other sites More sharing options...
Bionic Balls Posted July 12, 2007 Report Share Posted July 12, 2007 'kinell....is it really worth all that? why do they bother?73mm shell ***? Quote Link to comment Share on other sites More sharing options...
Tommy d Posted July 12, 2007 Report Share Posted July 12, 2007 Forgive my ignorance but why are Leeson BBs different to normal? Is this the eccentric BB tensioning thing? Quote Link to comment Share on other sites More sharing options...
Tomm Posted July 12, 2007 Report Share Posted July 12, 2007 Forgive my ignorance but why are Leeson BBs different to normal? Is this the eccentric BB tensioning thing?No. It's something to do with the way they're made - in order to have straight chainstays, the BB shell is very wide, so the BB has to be custom-fitted. It's kinda OK if it's a UN53 (they last for years) but when they need changing it's a royal pain in the arse. Which is why Clive Leeson doesn't like ISIS - the BB's don't last long enough. Quote Link to comment Share on other sites More sharing options...
Tommy d Posted July 12, 2007 Report Share Posted July 12, 2007 (edited) Ah I see. So the chainstays on a Leeson are dead straight all the way along? Didn't know that.Looking at this picture of my frame (Iolo) I think I get the idea, the chainstay would extend right to the BB so it has to be wider to join on. (I'm pretty slow to understand mechanical things)Now I understand why my frame had to have a 73mm shell. That was such a pain finding a long enough BB to make my chainring clear the frame! Hence spacer/cable tie bodge in that picture to push it out... (Now I have 73 x 127 UN54)By the way is the straight chainstay thing just for strength? Edited July 12, 2007 by Tommy d Quote Link to comment Share on other sites More sharing options...
N.Wood Posted July 12, 2007 Report Share Posted July 12, 2007 You can't CNC steel like you can with alu, and its a bit of a b*****d to bend th tube correctly.... I presume. Quote Link to comment Share on other sites More sharing options...
dave33 Posted July 13, 2007 Report Share Posted July 13, 2007 you can but it would be 3 time the weight Quote Link to comment Share on other sites More sharing options...
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