AlexC Posted June 23, 2009 Report Share Posted June 23, 2009 (edited) Morning,I know this topic is done to over and over, though searching I couldn't find anything that helped me. I've currently got an Onza Zoot as it comes (no changes done, really) however parts of the drive train are starting to fail/skip, so instead of it resulting in death I've decided I will replace the entire drive train and go single speed this time as well.Currently when actually doing trials, I'll whack it in 4th, which is 22t up front and 16t back - this feels good and is what I'm used to from it, however should I go for this ratio again? I hear people say 18:16 is good, but that sounds like it'll be impossible to pedal and do trials on, nearly 1:1. The front chainring will be replaced anyway, since some of the teeth are bent, so - may as well get it right.This is what I'll be replacing in total, if anyone has any ideas on what to get as well would be greatly appreciated. Any potential issues?BB: Trialtech ISIS (128mm axle length, Tarty said I'd need 127, but would a 128 suffice?)Chain: KMC K710 Kool, 1/8''Cranks: Trialtech Sport Forged: 175mm ISISFreewheel: Tensile (18t)Rear Hub: Trialtech Sport Rear Hub (Fixed 135mm)Sprocket: Echo TR Screw On (12t)Tensioner: 74Kingz Edited June 26, 2009 by AlexC Quote Link to comment Share on other sites More sharing options...
Luke Rainbird Posted June 23, 2009 Report Share Posted June 23, 2009 If you want something that feels the same as your 22:16 setup you'll be looking at 18:13, which is a fairly standard ratio for a 24" rider. You'd get away with going a up or down a tooth if you were looking to make a bit of an adjustment (Many people, myself included, run 18:14, 18:12 is a little hard perhaps) but 18:13 is almost identical to the current gearing I can't really comment on fixed hubs/freewheels etc having never used them (I'm a Hope/burns kinda guy, screwing on a high torque component still seems retarded to me) but any BB over £30 or so (check out Tarty/CRC's selection of DH kit) will do the trick, along with something like a KMC chain. Don't forget you'll more than likely be needing a chain tensioner of some kind. A 74Kingz or a Rohloff would be the way to go IMO, but there are plenty of other options out there Quote Link to comment Share on other sites More sharing options...
Simpson Posted June 23, 2009 Report Share Posted June 23, 2009 Bottom Bracket, Cranks, Chain, Rear Hub (to fixed), Cassette -> Freewheel, Chainring, Rear QR -> bolt on.If you insisting on running front freewheel then I would on a budjet get, Trial Tech Sport cranks, Eno/Tensile freewheel, Echo Tr fixed rear hub, 74 kings/rohloff (again depending on budget), 13 rear sprocket, any old bash like a tensile UCI, and you may be able to keep you BB if nothings wrong with it because replacing its pretty pricey. Quote Link to comment Share on other sites More sharing options...
AlexC Posted June 24, 2009 Author Report Share Posted June 24, 2009 Thanks both, that's helped. One thing, I emailed Tarty Bikes about the BB length for an Onza Zoot, and they said 127mm axel is needed - however I can't find one, only 127.5 or 128 etc. Does it matter if it is over?Just to confirm, I'd need a tensioner due to vertical dropout on the frame - so unable to drag the wheel back as on horizontal, correct? Quote Link to comment Share on other sites More sharing options...
Simpson Posted June 24, 2009 Report Share Posted June 24, 2009 Just to confirm, I'd need a tensioner due to vertical dropout on the frame - so unable to drag the wheel back as on horizontal, correct?YARRRRRRRRRRRRRRRRRRRRRRP Quote Link to comment Share on other sites More sharing options...
AlexC Posted June 26, 2009 Author Report Share Posted June 26, 2009 (edited) Ok, here is what I've got in mind to do the updates. Anyone see any potential issues?BB: Trialtech ISIS (128mm axle length, Tarty said I'd need 127, but would a 128 suffice?)Chain: KMC K710 Kool, 1/8''Cranks: Trialtech Sport Forged: 175mm ISISFreewheel: Tensile (18t)Rear Hub: Trialtech Sport Rear Hub (Fixed 135mm)Sprocket: Echo TR Screw On (12t)Tensioner: 74KingzGoing for 18:12 ratio (18 up front), which should be the same as my 22:16 currently. Obviously spokes for the rear wheel re-build as well. Would it be possible to use my existing bashguard (stock Onza build, no idea what it is), or would I need a new one (or even a bashplate, if would would fit? I prefer them). Edited June 26, 2009 by AlexC Quote Link to comment Share on other sites More sharing options...
craiggy1984 Posted June 26, 2009 Report Share Posted June 26, 2009 sweet,id say defo run 18t front freewheel/12 fixed rear ratio,thats what i have always run,on mods and on my current CZAR stock,and iv never gotten to a point where it was too easy to peddle,unless im coasting down a hill or peddling fast somewhere in a hurry to get to a riding spot or something like that lol Quote Link to comment Share on other sites More sharing options...
AlexC Posted June 28, 2009 Author Report Share Posted June 28, 2009 Bump, just want to check that everything listed there would all work nicely together, or if you'd advise different parts etc Quote Link to comment Share on other sites More sharing options...
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