Elliot Posted August 25, 2006 Report Share Posted August 25, 2006 Hey all,Well I changed my set up from this:http://www.trials-forum.co.uk/forum/index....i&img=15467to this:http://www.trials-forum.co.uk/forum/index....i&img=15562I changed the chain ring from dual to single 22th with bash ring and i changed the rear cassette to 12-21 sprocket. Now my problem is that on the biggest sprocket the chain rubs the tyre, as in here:http://www.trials-forum.co.uk/forum/index....i&img=15559So shat should I do? I have noticed that the chain is stretched, so i have bought a new KMC K810 Kool from tarty, but I cant see that from stopping the chain rubbing.Should I just stick a spacer on the bottom bracket (which is a Truvativ job)? But what about the internal spacer thing? wont that stop contacting both cups if i put on a spacer?Cheers again guys, moving from bmx single speed to all this gear balls is a pain in the arse!Elliot thinking bout it I also built the rear wheel, could I have not dished it enough? though that said, the tyre never rubbed with the old cassettee, and the rim sits pretty much in the centre of the pads. Quote Link to comment Share on other sites More sharing options...
bob87 Posted August 25, 2006 Report Share Posted August 25, 2006 I've never actualy seen this before.Spacing the bottom bracket will sort this.But i dont see the reason for you doing this.Why are you running it in such a high gear, is this the gear you usualy use/the only gear you use? Quote Link to comment Share on other sites More sharing options...
Elliot Posted August 25, 2006 Author Report Share Posted August 25, 2006 (edited) The previous cassette was 11-32 and I found that when using the 22th chainring i only used 11-20th of the gears (like the top 3 or 4) and the 32th was just pointless. so i thought i would change and buy a cassette with a range that had 22th at one end for trials stuff and 12 at the other end for getting to places. Having just ridden it around this kinda works, although I still cant see me using half the gears. Edited August 25, 2006 by Elliot Quote Link to comment Share on other sites More sharing options...
blinky Posted August 25, 2006 Report Share Posted August 25, 2006 erm, dont use the lowest gear?might help Quote Link to comment Share on other sites More sharing options...
MikeCottTrials Posted August 25, 2006 Report Share Posted August 25, 2006 its because youve messed up your chain line, but i dont really see the need for all those gears on a trials bike why not get a single cog on the back and run it in single speed using the rear mech as a tensioner Quote Link to comment Share on other sites More sharing options...
Onza Kieron Posted August 25, 2006 Report Share Posted August 25, 2006 Afew things you can do, buy a longer bb for alot of money or, don't use the top cog, I don't see why you would need it anyway, isn't it way too easy. Quote Link to comment Share on other sites More sharing options...
Heatsink Posted August 25, 2006 Report Share Posted August 25, 2006 When trials riders use a cassette, they wouldn't need the biggest sized rear sprocket (most spinny). The most spinny would be the one they use for trials, and this has no more than 20teeth normally for 22t front sprocket set-ups. There's no need for the sprocket you're wanting to use unless you're climbing very very steep hills - XC style! Extra useful gears to compliment the trials gear would mean some extra smaller ones for getting around. You have no need for you to need to use the biggest sprocket nearest the axle!You can make up a "Custom cassette" by taking apart 2 cassettes held together with the 3 bolts (rather than the ones with pins that have the ends flattened over) and then assembling a collection of spacers and sprockets that will be useful and having your preferred trials gear in the position that gives the straightest chainline so preventing skipping when put under alot of torque during trials riding.Steve Quote Link to comment Share on other sites More sharing options...
Tarquin Posted August 25, 2006 Report Share Posted August 25, 2006 change front to 20tooth, then use 16 on the back!I did it, 'tis beautiful. Ad you can get a 'Burn 20tooth for like 12 quid I think. Quote Link to comment Share on other sites More sharing options...
Elliot Posted August 25, 2006 Author Report Share Posted August 25, 2006 You can make up a "Custom cassette" by taking apart 2 cassettes held together with the 3 bolts (rather than the ones with pins that have the ends flattened over) and then assembling a collection of spacers and sprockets that will be useful and having your preferred trials gear in the position that gives the straightest chainline so preventing skipping when put under alot of torque during trials ridingI thought about that, and will probably do it when i have the time, for now I'll keep my random cassette and get a spacer or 2 to sort out the chain line. Thanks for all the info though people, its appreciated, Its a pain in the arse trying to build a trials bike when the one bloke you know who does it has moved away, and you havent the time to research it properly!! Anyway trial and error (and error and error...) is more fun cos I like tinkering, even if suck at it!! Quote Link to comment Share on other sites More sharing options...
Heatsink Posted August 25, 2006 Report Share Posted August 25, 2006 My previous email was very badly written!A better plan than the plastic spacers - I like the look of the Hope spacer kit on Tartybikes. Surely a huge advantage to similar single speed kits because you can position the sprocket to match the front one to give that all important straight chain line. Steve Quote Link to comment Share on other sites More sharing options...
Euro Braker Posted August 26, 2006 Report Share Posted August 26, 2006 Erm get used to it Quote Link to comment Share on other sites More sharing options...
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