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 Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

 11-13-08, 05:47 PM #1 WarshipWorship Member Thread Starter   Join Date: May 2008 Bikes: Posts: 29 Mentioned: 0 Post(s) Tagged: 0 Thread(s) Quoted: 0 Post(s) Trek 1000 Magic Gear I have an '89 Trek 1000 frame that I'd like to do a SS/FG conversion with, but it's got vertical dropouts. Don't have enough money for an ENO Eccentric, so I'd like to find the "magic gear," if at all possible. Now, I found a bike exactly like what I'm planning on Velospace, and the owner says he found the magic gear of 48/16. So should this ratio work for me too? Chainstay length, chainring size, and sprocket size should really be the only factors affecting chain length and thus whether or not the magic gear will work, correct? Or should I just save up for that White Industries? Thanks, WW
 11-13-08, 05:54 PM #2 clink83 Senior Member   Join Date: Aug 2008 Bikes: Posts: 1,025 Mentioned: 0 Post(s) Tagged: 0 Thread(s) Quoted: 0 Post(s) You could figure it out if you could find the diameter of the front and rear cogs. the math formula to give you a pretty close idea would be .5(2Pi(radius of front cog))+(.52Pi(radius of rear cog)+2(distance between centerlines of cogs) and then divide that number by 1/2. Once you got a whole number, you would have your magic ratio.
 11-13-08, 07:36 PM #3 imoscardotcom jawesome     Join Date: May 2008 Location: baltimore, md Bikes: Posts: 155 Mentioned: 0 Post(s) Tagged: 0 Thread(s) Quoted: 0 Post(s) leave it be and convert another bike.
 11-13-08, 07:56 PM #4 WarshipWorship Member Thread Starter   Join Date: May 2008 Bikes: Posts: 29 Mentioned: 0 Post(s) Tagged: 0 Thread(s) Quoted: 0 Post(s) Don't got no other bikes that fit me. Anyway I don't mind a challenge, and I got most of the parts already. Thanks clink, that math tells me what the ratio I need to run is? Or the gain ratio or something else?
 11-14-08, 12:07 PM #5 motorcade Senior Member   Join Date: Jul 2007 Bikes: Posts: 140 Mentioned: 0 Post(s) Tagged: 0 Thread(s) Quoted: 0 Post(s) There was an early 90's Trek 1400 (same frameset as 1000) on fixedgeargallery.com a while back that was converted with a 49x16. I used the ENO on mine. The frame does make for a nice conversion.
 11-14-08, 12:58 PM #6 tcs Palmer     Join Date: Mar 2007 Location: Parts Unknown Bikes: 1980 Mike Melton, 1982 Stumpjumper, 1982 Santana, 1984 Alex Moulton AM7, 1987 Dahon Classic III, 2007 Cannondale Capo, 2010 Dawes Briercliffe, 2017 Dahon Curl i3 Posts: 5,016 Mentioned: 10 Post(s) Tagged: 0 Thread(s) Quoted: 161 Post(s) More than one way to skin a cat. tcs