JD™ Posted October 23, 2012 Report Share Posted October 23, 2012 I may or may not be building a new bike at the moment, which may or may not be being built in Peru. To save the language barrier, and because my head is fried, does anyone know if there's issues with post mount discs and horizontal dropouts, because the wheel will move back over time as the chain stretches? As I'm writing this I'm thinking I might just go with verticals anyway, I just like the whole tensionerless look... Quote Link to comment Share on other sites More sharing options...
Revolver Posted October 23, 2012 Report Share Posted October 23, 2012 So long as there's a slot on the calliper it should work. If you went for the ordinary ISO disc mount you could have slots in that, like there are on the Zoot. Quote Link to comment Share on other sites More sharing options...
JD™ Posted October 23, 2012 Author Report Share Posted October 23, 2012 I forgot about the slots on the calliper, d'oh. Should be fine then. I think I'm going with Saints so I might as well go with post mount on the frame... 1 Quote Link to comment Share on other sites More sharing options...
Ali C Posted October 23, 2012 Report Share Posted October 23, 2012 lets say a certain frame that I may be riding may or may not not have vertical dropouts and a rear disc and I definitely never havn't not had any problems without sliding disc mounts. 4 Quote Link to comment Share on other sites More sharing options...
JD™ Posted October 23, 2012 Author Report Share Posted October 23, 2012 Ouch. Quote Link to comment Share on other sites More sharing options...
Ali C Posted October 23, 2012 Report Share Posted October 23, 2012 I can't really make it any clearer 3 Quote Link to comment Share on other sites More sharing options...
FamilyBiker Posted October 23, 2012 Report Share Posted October 23, 2012 the slots on pm calipers arent radial(back or forwards) to the wheel,theyre axial (from left to right).how would you compensate wheel movement to the back? as its marino,he´ll be able to build you a plate with say 6 threaded holes to mount it(obviously with pm spacing)to have 3 positions.i talked about something like that to marino once because my is adapters always cracked from the forces when tapping.but then we didnt build it.let me search my drawing... Quote Link to comment Share on other sites More sharing options...
Ali C Posted October 23, 2012 Report Share Posted October 23, 2012 if you are getting a custom frame and don't work out how long your chainstays are with your fave gear ratio then you're doing it very wrong. Once you have your chain tensioned with your ratio and the brake caliper welded on, chain stretch is maybe ~3mm.......3mm doesn't warrant sliding dropouts for most (all?) callipers. Edit, with the angle that callipers are at on the back, moving the wheel backwards doesn't mean you're taking the rotor 3mm down the pads, it's more like your just moving it backwards, so pad contact with the rotor doesn't change all that much. Quote Link to comment Share on other sites More sharing options...
FamilyBiker Posted October 23, 2012 Report Share Posted October 23, 2012 (edited) youre right ali,sorry.have checked my old drawings and the idea was an adjustable pm +25 for avid 185 disc and a position between for +20 standard disc.forget what i said regarding that. for the sliding mounts,i had them because it was my first custom frame and i was afraid of something wich doesnt fit ie chainwheel/sprocket combo... if you wanna play around with cs lenghts and gear ratio its not a bad thing Edited October 23, 2012 by FamilyBiker Quote Link to comment Share on other sites More sharing options...
Ross McArthur Posted October 24, 2012 Report Share Posted October 24, 2012 (edited) if you are getting a custom frame and don't work out how long your chainstays are with your fave gear ratio then you're doing it very wrong. How would you go about doing that Ali? So my prefered gear set up would be 22:16 and I'd like to run this on a 24" frame. How do I find out how short I can make the chain stays? I take it its a lot to do with the chain length I can achieve (without using a half link or anything). Edited October 24, 2012 by Ross McArthur Quote Link to comment Share on other sites More sharing options...
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