David Posted June 20, 2006 Report Share Posted June 20, 2006 I seem to remember ages ago a few people coming up with crazy ideas of putting the rear mech above the chainstay so you dont bash it while riding. I think someone said there would be a problem with shifting as more chain would be wrapped around the cassette?? Basically im looknig for more info on it as I am planning on designing a street frame for my A2 DT cwk but I need to solve a problem which currently exists with frames. (I am thinking about the problem of bending mech hangers)Any help is very much appreciated.ThanksDave Quote Link to comment Share on other sites More sharing options...
PaRtZ Posted June 20, 2006 Report Share Posted June 20, 2006 Well i don't know if its any help, but Im sure someone said that it would be difficult to use just a normal tensioner on the chain because when you pedal you tighten the chain on the top and it....does something... I think maybe you need to (first of all find out what the hell im going on about) solve this problem of just a normal tensioner before working out a mech Quote Link to comment Share on other sites More sharing options...
Dr. Nick Riviera Posted June 20, 2006 Report Share Posted June 20, 2006 you can't shift on there, firstly it would shift backwards, and it would shift off of your chainring. not happening, take something like the fresh products tensioner and work from that, maybe look at a rohloff as well. Quote Link to comment Share on other sites More sharing options...
011001000110010101110010 Posted June 20, 2006 Report Share Posted June 20, 2006 When you pedal you apply all the force through the top part of the chain, creating the tension. Thats why one single speed bikes its always the bottom parts that slaps around. So because of this it wouldnt work, if it did Im sure Shimano would have done it... Quote Link to comment Share on other sites More sharing options...
David Posted June 20, 2006 Author Report Share Posted June 20, 2006 Oops I just realised its obvisouly not going to work Sorry my minds not workin very well today hehe. Can anyone think of any design problems with trials frames at the moment that could be solved? Quote Link to comment Share on other sites More sharing options...
adamtrials Posted June 20, 2006 Report Share Posted June 20, 2006 Why dont you try a dropped chainstay idea like on that onza proto?I think the only reason they scrapped the idea was because it got silly dabs in uci comps,which isnt going to be a problem on a street bike... Quote Link to comment Share on other sites More sharing options...
David Posted June 20, 2006 Author Report Share Posted June 20, 2006 Why dont you try a dropped chainstay idea like on that onza proto?I think the only reason they scrapped the idea was because it got silly dabs in uci comps,which isnt going to be a problem on a street bike...Im not intirely sure why they dropped the chainstay in the first place?? Ill look for a pic... Quote Link to comment Share on other sites More sharing options...
ARSE! Posted June 20, 2006 Report Share Posted June 20, 2006 Im not intirely sure why they dropped the chainstay in the first place?? Ill look for a pic...It means you dont have to undo a link to remove the chain, it just comes off. Quote Link to comment Share on other sites More sharing options...
David Posted June 20, 2006 Author Report Share Posted June 20, 2006 Ahhh I see, thats quite clever. Quote Link to comment Share on other sites More sharing options...
adamtrials Posted June 20, 2006 Report Share Posted June 20, 2006 And also you could mount a tensioner inside it so it is protected.It also protects the rear sprocket and chain from getting whacked on sidehops. Quote Link to comment Share on other sites More sharing options...
Bionic Balls Posted June 20, 2006 Report Share Posted June 20, 2006 instead...you twat yer frame personally i don't think that's very helpful...adam Quote Link to comment Share on other sites More sharing options...
adamtrials Posted June 20, 2006 Report Share Posted June 20, 2006 (edited) If its a street frame people do chainstay stalls n stuff so I cant really see it being a problem...Or if it is you could make it so it has replaceable grind/ bash type plates on the stay Edited June 20, 2006 by adamtrials Quote Link to comment Share on other sites More sharing options...
Krisboats Posted June 21, 2006 Report Share Posted June 21, 2006 or you could try a hightened chainstay like that of the new ali c/koxx design to eliminate chainstay bashage and to allow for chain removal without the need for a tool. You could then buils it and let me know whether its possible to sidehop onto the chain on it and snap the b*****d chain .... been bugging me for ages Quote Link to comment Share on other sites More sharing options...
Bionic Balls Posted June 21, 2006 Report Share Posted June 21, 2006 you got a pic of this frame?sounds. freaky.adam Quote Link to comment Share on other sites More sharing options...
Simpson Posted June 22, 2006 Report Share Posted June 22, 2006 But is he wants to design it is kinda already been done........Claim it as you own why not!!! lol Quote Link to comment Share on other sites More sharing options...
BikeDotStuffAtOnzaDotCom Posted June 22, 2006 Report Share Posted June 22, 2006 It hasn't been abandoned yet.The chief reason for dropping the stays was so that the chain tensioners could be brought "inboard" and stop them being slapped up by landing on them. It also removes any problems with the width/height/positioning of chainstays between the chain and gives a nice chain line. Other things still need to be considered but that's the way it goes...Personally I thought the second one (which Mark has currently) looks a lot nicer than the first because of the CNC part after the bottom bracket continuing in line with the down tube.Removing the chain without a link tool was just a side issue, not the reason it was tried in the first place.Regarding looking for problems to solve, I'm sure everyone could supply you with one if they thought about it; there are usually things I think of while riding but which are forgotten quickly. If you can conveniently get to Coventry you should visit the transport museum, which has a fantastic number of bicycles which might give you some inspiration. Alternatively there are some books, but they aren't usually easily found. Names if required...The only way to put the changer on the top would be to pedal backwards (like people have said the chain needs to be in tension between chainring and sprocket). There has been one gearing method which gave you one gear when pedalling forward and another when pedalling backwards... how many gears did you need? Quote Link to comment Share on other sites More sharing options...
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