harmertrials Posted May 17, 2012 Report Share Posted May 17, 2012 Anyone got any ideas how to get this sprocket off? Tried several chains, right through to a KHE collapse. It wont budge http://www.youtube.com/watch?v=9qQaYJO0YBA have a look at the vid to see the method we're trying. Quote Link to comment Share on other sites More sharing options...
Martin Reynolds Posted May 17, 2012 Report Share Posted May 17, 2012 WHY oh WHY would you use another frame? Scafold bar, old bit of chain and a vice! Quote Link to comment Share on other sites More sharing options...
harmertrials Posted May 17, 2012 Author Report Share Posted May 17, 2012 Tried for 2 hours in a vice, all chains snapped. Even the tarty boys recommend another frame, it's just a spare anywayby the way it's the sprocket on the rear, hence the middleburns Quote Link to comment Share on other sites More sharing options...
Adam-Griffin Posted May 17, 2012 Report Share Posted May 17, 2012 Do you actually need the sprocket? Quote Link to comment Share on other sites More sharing options...
Martin Reynolds Posted May 17, 2012 Report Share Posted May 17, 2012 Do you actually need the sprocket? Adams right. If your snapping chains, the only way to get it off (and save the cranks)would be to cut through the sprocket Quote Link to comment Share on other sites More sharing options...
harmertrials Posted May 17, 2012 Author Report Share Posted May 17, 2012 Yeah ideally Quote Link to comment Share on other sites More sharing options...
Adam-Griffin Posted May 17, 2012 Report Share Posted May 17, 2012 Well if all else fails, it might be worth slamming it in the vice between 2 blocks of woods (So that the teeth dig in..) And then twist the wheel. I always found it works, and to be fair the sprocket may still work, but it's a risk.. Quote Link to comment Share on other sites More sharing options...
harmertrials Posted May 17, 2012 Author Report Share Posted May 17, 2012 tried that earlier, pulled straight out Quote Link to comment Share on other sites More sharing options...
Andeee Posted May 17, 2012 Report Share Posted May 17, 2012 Alloy frame???? ARE YOU RETARDED!!?? did you not see the slight flex in the frame then. Nice big fat metal scaffold bar u'll do job.. Quote Link to comment Share on other sites More sharing options...
harmertrials Posted May 17, 2012 Author Report Share Posted May 17, 2012 the frame is a write off anyway, if the chain's snapping what difference would a scaffold bar make? Quote Link to comment Share on other sites More sharing options...
Martin Reynolds Posted May 17, 2012 Report Share Posted May 17, 2012 Gusset tank chain and scaffold bar 1 Quote Link to comment Share on other sites More sharing options...
harmertrials Posted May 17, 2012 Author Report Share Posted May 17, 2012 I agree, wish I had a tank chain. Just wondering if anyone has any miracle methods? This is definitely better than it being in a vice, would wd40 help? Can't see it doing much Quote Link to comment Share on other sites More sharing options...
Martin Reynolds Posted May 17, 2012 Report Share Posted May 17, 2012 With the sprocket being this tight on the threads, i doubt it. You could always try submerging it in wd40/oil, and leaving it overnight to soak in. Is the sprocket on the wheel or cranks? Quote Link to comment Share on other sites More sharing options...
harmertrials Posted May 17, 2012 Author Report Share Posted May 17, 2012 Sprocket's on the hub, i'm going to do that I think, worth a shot. Good shout Quote Link to comment Share on other sites More sharing options...
CalRobbo341 Posted May 17, 2012 Report Share Posted May 17, 2012 After the bath in WD40, could you not use a chain whip, have a mighty chain on, and just go ham on it? Quote Link to comment Share on other sites More sharing options...
Mark W Posted May 17, 2012 Report Share Posted May 17, 2012 This is definitely better than it being in a vice, How? The chain snaps because it's the weak link. The force you were putting in was going into making your wheel move a bit, your chain become taut and things flexing. If you put the wheel (well, sprocket) into a vice your energy's being directed at where it needs to be rather than f**king everything else you use. If you use the 'pinched link' trick with a vice, it works every time as long as you make sure it's all set up right. I've never seen it beaten. If you get two of you on it with the tyre inflated you're basically set too. Just give it a "1... 2... 3..." and a heft and they always come off. Make sure your weight's pressing down on it too and it can't jump out of the vice or twist away. Quote Link to comment Share on other sites More sharing options...
harmertrials Posted May 17, 2012 Author Report Share Posted May 17, 2012 Can you explain the 'pinched link trick' more? Do you basically mean leaving a link gap between the sprocket and the vice so that it pinches back on itself? Quote Link to comment Share on other sites More sharing options...
Mark W Posted May 17, 2012 Report Share Posted May 17, 2012 It's hard to explain without showing a photo - basically you start by wrapping the chain around the sprocket. Once you've got the chain wrapped around a few teeth, you sort of fold the chain back on itself so it makes a little point/triangle, then continue wrapping it. If you do it right, it basically looks like the chain's firmly wrapped around as many teeth as possible, but you have a little half-a-link deep 'point' sticking out of it. That 'point' basically stops the chain from being able to be pulled/slid through the vice. Quote Link to comment Share on other sites More sharing options...
harmertrials Posted May 17, 2012 Author Report Share Posted May 17, 2012 http://www.tartybikes.co.uk/media/guides/maintenance_freewheel_and_sprocket_removal/m1.html We tried the method Adam uses here, but clamped to stupid tension... and the chains snapped several times over. I get what you mean about the pinch technique now, but are you saying to wrap the chain around and then drop that into the vice rather than the 'trailing' ends? Quote Link to comment Share on other sites More sharing options...
sstein Posted May 18, 2012 Report Share Posted May 18, 2012 what rear hub are you using? if you have burns (and i doubt you are riding fixed) then maybe you are using the wrong removal method Quote Link to comment Share on other sites More sharing options...
harmertrials Posted May 18, 2012 Author Report Share Posted May 18, 2012 (edited) I've put a burn on it to make it fixed for removal. Flipped the wheel over in the frame and put a burn on non drive-side, so when you pull down it un-do's the sprocket. Echo hub Edited May 18, 2012 by harmertrials Quote Link to comment Share on other sites More sharing options...
monkeyseemonkeydo Posted May 18, 2012 Report Share Posted May 18, 2012 It's not an echo hub with a lockring is it? You never know... I've always used the vice then grab the tyre and twist method and it's never failed. Quote Link to comment Share on other sites More sharing options...
err Posted May 18, 2012 Report Share Posted May 18, 2012 (edited) could possibly use some pipe freezing spray, iirc ali contracts more than steel when you chill it? Edited May 18, 2012 by err Quote Link to comment Share on other sites More sharing options...
harmertrials Posted May 18, 2012 Author Report Share Posted May 18, 2012 It's not an echo hub with a lockring is it? You never know... I've always used the vice then grab the tyre and twist method and it's never failed. It doesn't have the lockring no haha. Wish it bloody did. could possibly use some pipe freezing spray, iirc ali contracts more than steel when you chill it? Sounds good, was trying to work out a way of chilling it, it's been bathing in gt85 since last night, will have another go later Quote Link to comment Share on other sites More sharing options...
Jamie_Trials Posted May 18, 2012 Report Share Posted May 18, 2012 Try heating it up first Quote Link to comment Share on other sites More sharing options...
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