jacklero
Free Rider
Haha! Mine is longer!
Posts: 226
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Post by jacklero on Dec 28, 2007 23:50:48 GMT 8
Before you guys start taking out your pitch forks and torches to hunt me down, I wanted to share with you an idea to help you/and or a friend progress through the process of pure single speeding. I've ridden single on most of my bikes for more than a year now. Even my girlfriend is now discovering the pleasure of riding single speed on the commuter I built up for her. Admittedly while my single speed is a great bike, there are just some situations (think manila city riding) where gears really just come in handy. So I figured might as well innovate a solution. In the new bike I built I decided to experiment. 32 x 14-18-23t gearing Its alive!!!! I was inspired by something that Jeff Jones (Jones Bike fame) did using XTR cogs. I did some digging on the InterWebs and I found that the system was published before in DirtRag Magazine and it is called a Mitchell Drive (apparently named after the writer who thought of the idea). Most Mitchell Drive systems however run with 4-gears. I figured, if I could mimic the gear differences of mamachari bikes then maybe, just maybe, the discipline of staying in a single gear for most of my riding would still make for a single speed experience thus the tringle was born. I realized that the most common problem with 8-9 speed systems (24-27 with chainrings) is the number of redundant gearing available. Math never really loved me so I figured the simpler the better, while it may not be entirely single speed, think of it as having three bikes for different purposes. =)
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Post by Ben Dover on Dec 29, 2007 0:13:21 GMT 8
time warp is real! i think this was how the multi-geared bike was actually invented !! hahaha! joke lang jacklero ;D i actually love reading posts like this...very informative for guy like me who can't even adjust a rear derailleur (or spell?) properly.
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jacklero
Free Rider
Haha! Mine is longer!
Posts: 226
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Post by jacklero on Dec 29, 2007 1:41:20 GMT 8
@lamok yep kinda like the way geared bikes were invented except that the quick release hub was actually invented before the derailleur... Behold...Tulio Campagnolo's contribution to the modern bike, the Cambio Corsa rod shifting system (photo courtesy of Cyberbike.com)
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Post by krx on Dec 29, 2007 10:48:04 GMT 8
I believe tutubing kalye uses a bingle, or dual sized cogs on his softail commuter bike. Though he changes them by hand and not by dérailleur. You've seen his bike jacklero ryt, at the gift giving ride?
kRx
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jacklero
Free Rider
Haha! Mine is longer!
Posts: 226
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Post by jacklero on Dec 30, 2007 9:05:30 GMT 8
yup krx he has a dingle, though before the lockring he uses a 11t cog which may or may not be used but yep I saw his bike in the gift giving ride, really cool stumpy FSR 1 by the way.
Doy
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Post by anthrax76 on Jan 17, 2008 20:05:02 GMT 8
hmm...someone else in the US was using a dingle, but with 2 chainrings.
just a newbie question, did you limit your RD to only 3 cogs? and err..how many teeth for the chainring?
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jacklero
Free Rider
Haha! Mine is longer!
Posts: 226
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Post by jacklero on Jan 17, 2008 20:15:10 GMT 8
@anthrax
if you work with the High and Low settings of your RD you could actually limit the travel, my SRAM is not entirely limited to 3 cogs, I actually have a 4th jump which I avoid shifting to at all costs. This is the beauty of shimano RDs as you could actually max-out both High and Low setting screws so that the RD does not move making it a good alternative tensioner. I use a 32t chainring for the setup by the way.
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Post by flipnidaho on Jan 17, 2008 20:29:27 GMT 8
I run a dingle on one of my bikes (2 cogs, 2 chainrings). I also have a Paul Melvin Tensioner that can allow me to run one cog and two chainrings up front (shifting is done by your feet)... That can give you a big city gear and a nice low dirt gear.
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jacklero
Free Rider
Haha! Mine is longer!
Posts: 226
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Post by jacklero on Jan 17, 2008 20:39:13 GMT 8
yup saw the dual duty thread, nice! It's good you were able to find a good ratio that accommodates both low and high gear with the same chain length.
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bobby
Free Rider
Posts: 269
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Post by bobby on May 8, 2008 23:20:13 GMT 8
i like to try your concept on a tringle and gary's dingle but his chainring tooth number is hard to find. like you math is not my friend too. even flunked my highschool algebra and had to take summer classes.
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Post by thops on May 12, 2008 0:10:50 GMT 8
keep your single speed "single"
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