Sir_Hops_Alot Posted October 27, 2007 Report Share Posted October 27, 2007 Right well as most of you know i have a mad phase 1.2, and for some reason the chain keeps jamming up on the front cog when i peddle and is really dangerous. So, what i was thinking was, if i take off all the shifter and cables and shorten my chain so the derailuer is practically upright, this would help. Also is it possible to have the derailuer off completely as it annoying, if i can get me chain the exact right length. Heres a pic of my deraileur and gearing on back end. Your comments would be appreciated. ThanksP.S I am getting the single speeded done properly when i get paid. Quote Link to comment Share on other sites More sharing options...
BenLeacock™ Posted October 27, 2007 Report Share Posted October 27, 2007 im pritty sure you will need to keep the mech on as a tensioner ! Quote Link to comment Share on other sites More sharing options...
Dan_Trials Posted October 27, 2007 Report Share Posted October 27, 2007 My brother has a MAD 2.six, which is basically the same bike. The reason the chain comes off the front sprocket is because it is too far over to the right and the chain line is out when you use anything less than 4th gear. Because of the design of the chain stays the only way to bring the sprocket further in would be to use an 18 tooth (which is pretty pointless as you would then need to use the lower gears anyway). My solution is to put the bike in 5th, which is 16tooth but gives the best chain line, and ride it like that for a while untill you are sure you can live with that ratio, it is a little harder than some people like. If you are happy with it then shorten the chain as you described above. If you want to use 4th, it would be ebst to pop the cassette apart and swap 4th and 5th so the chain is lined up better. Then get a nice single speed kit and tensioner from Tarty Bikes! Quote Link to comment Share on other sites More sharing options...
Sir_Hops_Alot Posted October 27, 2007 Author Report Share Posted October 27, 2007 Woooh thanks mate that was a very detailed reply. I actually ride my bike in 5th already so i think it would be perfect and its always been in 5th, so why is it still getting jammed? Quote Link to comment Share on other sites More sharing options...
Dan_Trials Posted October 27, 2007 Report Share Posted October 27, 2007 Woooh thanks mate that was a very detailed reply. I actually ride my bike in 5th already so i think it would be perfect and its always been in 5th, so why is it still getting jammed?Because of the chain slack. When you land a bunny hop for example everything goes slack and the chain is free to come off. Tensioning the chain right up will stop this. Quote Link to comment Share on other sites More sharing options...
Sir_Hops_Alot Posted October 27, 2007 Author Report Share Posted October 27, 2007 Oh right ok, so do you not advice taking off the deraileur if i can get the chain short enough? Quote Link to comment Share on other sites More sharing options...
BenLeacock™ Posted October 27, 2007 Report Share Posted October 27, 2007 Oh right ok, so do you not advice taking off the deraileur if i can get the chain short enough?That wont work, you need it as a tensioner ! Quote Link to comment Share on other sites More sharing options...
Dan_Trials Posted October 27, 2007 Report Share Posted October 27, 2007 Oh right ok, so do you not advice taking off the deraileur if i can get the chain short enough?No. Chances are you wont get the chain to the correct length where it is tensioned. It will be either too long or too short. Using the mech will tension it right up, or get a tensioner that will replace the mech. Quote Link to comment Share on other sites More sharing options...
Sir_Hops_Alot Posted October 27, 2007 Author Report Share Posted October 27, 2007 Ok thanks Ben mate.I'll put some pics up on here when i done it lol Quote Link to comment Share on other sites More sharing options...
Tomm Posted October 27, 2007 Report Share Posted October 27, 2007 The best thing to do is to take all of the cassette sprockets off, except the one you use for trials. You'll need some cassette spacers though. (Even better, buy a single sprocket, E.g. Shimano DX, which will be stronger and better). Then shorten the chain to the shortest possible. You can still run a mech - they tension really well. Quote Link to comment Share on other sites More sharing options...
Dan_Trials Posted October 27, 2007 Report Share Posted October 27, 2007 The best thing to do is to take all of the cassette sprockets off, except the one you use for trials. You'll need some cassette spacers though. (Even better, buy a single sprocket, E.g. Shimano DX, which will be stronger and better). Then shorten the chain to the shortest possible. You can still run a mech - they tension really well.That is one of the best ways, or use a SS kit, which is basically the same. However, I got the impression he was after something free and instant so he can ride tomorrow. I know that's how it used to be with me anyway! Quote Link to comment Share on other sites More sharing options...
Sir_Hops_Alot Posted October 27, 2007 Author Report Share Posted October 27, 2007 (edited) From this:To this:The chain was the exact right length, just means i can't take the wheel out without splitting the chain. So if anybody has a split link they want to give me feel free. Edited October 27, 2007 by Chris_J Quote Link to comment Share on other sites More sharing options...
strat-trials Posted October 27, 2007 Report Share Posted October 27, 2007 I wouldn't ride like that, the cogs on the back have rampings to aid in shifting. I tried a setup like that and under extreme pressures your chain may jam up. And your chain WILL stretch, meaning it will come slack. Some of the bodges people have made in the home made tensioners part are really good and easy to make.I'd just put like 1 or 2 links in your chain and use the mech. That will give you perfect tension and should be hassle free.Tom Quote Link to comment Share on other sites More sharing options...
Sir_Hops_Alot Posted October 27, 2007 Author Report Share Posted October 27, 2007 No it didnt because the derailuer is spring loaded so it was changing the gear of my bike without me touching it. It's only a temperary measure until i get paid in two weeks proberly, but the home made tension might be something i look into. Quote Link to comment Share on other sites More sharing options...
Simon Posted October 28, 2007 Report Share Posted October 28, 2007 Such, such a bad idea.Get a washer to go around the mech bolt that goes into the hanger/frame, about 4-5mm thick.Get the mech, take the spring out of where the bolt goes through to hold it to frame, be careful, its very vicious.Now take out the mech cable, get a spoke from an old wheel and shorten it to about 2 or 3 inches from the side the spoke is done up from, not the hub side. Push this through where the cable used to be and do up the bolt to the spoke.Put bolt through mech, washer on end then bolt to frame. Put chain through mech as usual and do up mech as tight as possible, it is now locked out.To adjust the gears simple adjust them into the gear you want then you can have +1-1 gears adjustment through the spoke adjustment bit at the end. (where you'd usually put the spoke key to true wheels)I've explained it shit but it whats countless people do, check some pictures if this doesn't make sense. Quote Link to comment Share on other sites More sharing options...
Broomer Posted October 28, 2007 Report Share Posted October 28, 2007 I wouldn't ride like that, the cogs on the back have rampings to aid in shifting. I tried a setup like that and under extreme pressures your chain may jam up. And your chain WILL stretch, meaning it will come slack. Some of the bodges people have made in the home made tensioners part are really good and easy to make.I'd just put like 1 or 2 links in your chain and use the mech. That will give you perfect tension and should be hassle free.TomOr jump upto a bigger sprocket and snap/bend your axle and sprocket on your cranks, Quote Link to comment Share on other sites More sharing options...
Sir_Hops_Alot Posted October 28, 2007 Author Report Share Posted October 28, 2007 Im well confused what are you guys talking about?You don't explain things very well. Quote Link to comment Share on other sites More sharing options...
Phil H Posted October 28, 2007 Report Share Posted October 28, 2007 P.s when you have sorted out the single speed seriously consider getting a new meaty chain if you have the dosh (KHE collapse/KMC Kool etc), your current one looks deadly.Phil Quote Link to comment Share on other sites More sharing options...
Mike W Posted October 28, 2007 Report Share Posted October 28, 2007 I did this before when i snapped my mech hanger years ago on my specialized, ive never been so scared in my life.On the teeth on the cassette the teeth are slightly cut at an angle to one side to make the chain move more easily.So when you have the chain sat without anything holding it (mech) it will want to change gear upwards.but if its working at the moment and you have tested it for a couple of rides it might be okay.Mike Quote Link to comment Share on other sites More sharing options...
wrongsideof40 Posted October 28, 2007 Report Share Posted October 28, 2007 Or Just put your mech back on for now and use the 2 adjusting screws on the mech to lock it into the gear that you want to use, you may have to find some longer screws, but it works well. I have shorted my chain and adjusted the mech so there is no possibility of selecting 3 of the largest cogs. Which I have done until I find which gear is best for me. Quote Link to comment Share on other sites More sharing options...
El Cristoff Posted October 29, 2007 Report Share Posted October 29, 2007 i can make you a homemade tentioner, if you like. Quote Link to comment Share on other sites More sharing options...
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