King C Posted February 6, 2006 Report Share Posted February 6, 2006 As it says in the title really, Is it possible and if so how do you remove fixed rear sprockets on mod hubsThanks in advance KingPS I ordered my zona zip today and a new tryall rim Quote Link to comment Share on other sites More sharing options...
the judge Posted February 6, 2006 Report Share Posted February 6, 2006 I'm not sure how you're supposed to do it, but you could use a chain whip Quote Link to comment Share on other sites More sharing options...
sammerz Posted February 6, 2006 Report Share Posted February 6, 2006 Place the wheel, hub or crank into the sproket and use a chain wip to remove the rear or front sproket Sam Quote Link to comment Share on other sites More sharing options...
tom tom Posted February 6, 2006 Report Share Posted February 6, 2006 Place the wheel, hub or crank into the sproket and use a chain wip to remove the rear or front sproket Samdo you use the same tools as you do to take off the cassette on a freehub on a 26" hub?tom tom Quote Link to comment Share on other sites More sharing options...
King C Posted February 6, 2006 Author Report Share Posted February 6, 2006 I was looking on tartybikes for a chain whip but it says not to use it on fixed sprockets as they are usually extra tight. Quote Link to comment Share on other sites More sharing options...
Gavyn. Posted February 6, 2006 Report Share Posted February 6, 2006 use a chain whip if its uber tight use a blow torch and a chain whip.if some of the teeth are broken is easiest to grind flat two opposing sides and use an ajustable spanner. Quote Link to comment Share on other sites More sharing options...
King C Posted February 6, 2006 Author Report Share Posted February 6, 2006 I was hping to reuse the sprocket, hence need for removal so thats the second idea out the window. Will the first idea damage the sprocket or not? Quote Link to comment Share on other sites More sharing options...
monkey gav Posted February 6, 2006 Report Share Posted February 6, 2006 by the way this is the same person as gavynl no it will only make it black for while but it will still be fine the heat just expands the sprocket but it goes back to normal once its cool Quote Link to comment Share on other sites More sharing options...
JT! Posted February 6, 2006 Report Share Posted February 6, 2006 (edited) but you could use a chain whipChain whips are designed to remove casettes from stock wheels (basicly to stop them from turning). The forse needed to removed a 12t cog of a mod rear is alot more, therefor if you used a chain whip, it would destroy it's self. I was hping to reuse the sprocket, hence need for removal so thats the second idea out the window.I don't think there is a way of getting the cog of without damaging it. Even if you use a wooden vice, the teeth rip though the wood and you get no where.The way i did it was to crush the cog into a metal vice and turn the wheel with alot of forse. Get two people on it if you can't do it yourself. But the cog will be buggerd.If you just have the hub and it isn't attacthed to the wheel. Take an angle grinder with a cutting disk and carefully cut it twice. Never done this but it is what people do with freewheels when they need to come off. Edited February 6, 2006 by JT! Quote Link to comment Share on other sites More sharing options...
Guest Posted February 6, 2006 Report Share Posted February 6, 2006 Jt know's it, it's not coming off in one piece. I tried absoutley everything, using wood in a vice to give the teeth something to grip to, simply doesn't work. I tried the wood, and the vice on it's own, by the time you have tightened the vice around the sprocket the teeth are buggered.I actually brough it into college cos they have nice big vice's and all, got a lecturer to try it, big burly man from 'up tha country' built like a tank, couldn't move it at all, i was in awe that it held even with his strength.I had considered heating the area, but the cog is steel and I imagine my hub is Alumunium. I just didn't want to start funking around incase I wrecked the entire hub.In the end I had to grab the angle grinder, fix the wheel somehow, or get someone to hold it steady, pick an area that's nice and clean, and grind away the teeth very slowly towards the hub threads. As you make more and more cuts (really take time to limit damage to the hub thread) you beging to see lines emerge that look like dirt, once you see these, stop grinding that area and move towards the cantre of the hub. I find it easiest to start on the drive side of the hub, make small cuts, and then move towards the non-drive side, doing the same thing untill you see the lines, which are the threads. The bigger the lines become, the more you destroying the hub threads, so try and do this in as small an area as possible, at this point the sprocket will still most likely be firmly stuck to the hub, time to grab a hammer and a screw driver or blunt (masonry) chisel type tool. put it on one of the teeth and whack it hard, the cog should break, making it easier to screw off either by hand, in a vice, or using a dirty old rag.Clean up the threads and affix new sprocket Best of luck, it's isn't easy, and there's no 'official' way to do it......If I hadn't lost my phone id have shown you a picture of my old cog, it's a mess. Ill try and get a few pics in the next few days, it will help explain my shitty description! Quote Link to comment Share on other sites More sharing options...
Gavyn. Posted February 7, 2006 Report Share Posted February 7, 2006 (edited) one more way to get it off would be to use a peice of chain around the teeth before putting in the vice. Edited February 7, 2006 by Gavyn L Quote Link to comment Share on other sites More sharing options...
King C Posted February 7, 2006 Author Report Share Posted February 7, 2006 Ive come to the conclusion that it won't come off without a vice. With a vice, I m not sure as I don't have one. Looks like another visit to tarty bikes. Quote Link to comment Share on other sites More sharing options...
Dan6061 Posted February 7, 2006 Report Share Posted February 7, 2006 We managed to get one off a guys T-Mag he brought into work. Park Tool chainwhip + rubber mallet + a lot of smacking = Cog off + Broken Chain whip Was funny Quote Link to comment Share on other sites More sharing options...
watto Posted February 7, 2006 Report Share Posted February 7, 2006 wrap an old chain round the cog fasten into a vice and spin the wheel around should work thats how we got my mates off Quote Link to comment Share on other sites More sharing options...
wilky_mod_legend2 Posted February 7, 2006 Report Share Posted February 7, 2006 They are a right mission to get off, just buy a new one, 12 quid for echo 1.I know it can be removed but its a task!, get a chain whip and i work mate, put wheel in that, and get a huge pole and put it on end of whip and jump in it.CheersWilky Quote Link to comment Share on other sites More sharing options...
Guest Posted February 7, 2006 Report Share Posted February 7, 2006 They are a right mission to get off, just buy a new one, 12 quid for echo 1.I know it can be removed but its a task!, get a chain whip and i work mate, put wheel in that, and get a huge pole and put it on end of whip and jump in it.CheersWilkySigh, how many times must it be said, a chain whip will not do the job. Have you ever had to remove a rear cog? If you fix the wheel to a work mate and attach a big pole and stand on it, the workmate is going to move before the cog does, it wouldn't have nearly enough strength to do it. Quote Link to comment Share on other sites More sharing options...
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