Combine front derailleur with Sturmey Archer
Has anyone had success with adding a front derailleur onto a 3-speed bicycle with a rear in-hub shifter (like a Sturmey Archer) thus creating a transmission with six usable gears?
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You would need a chain tensioner to be able to run a multicog front and a singlecog back.
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I'm not sure what all would be required up front. Are the bottom bearing brackets the same for each style of crank? Is it a problem to mount a front derailleur on a bike that wasn't made for it? Seems like it would be easier to just get a 7-speed hub.
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Originally Posted by 77Univega
(Post 9179982)
Has anyone had success with adding a front derailleur onto a 3-speed bicycle with a rear in-hub shifter (like a Sturmey Archer) thus creating a transmission with six usable gears?
http://i17.photobucket.com/albums/b9...e/IMG_2571.jpg The 1/8th inch chain three cog 15-19-23 was made to yield five useable gears with next to nothing gained by double shifting, because all of the interior ratios are basically duplicated. You get ratios of: 39-46-63-84-107 If you regard the three speed hub ratios as if they were a triple front, it would be like having 35T-46T-62T chainrings. For example, with a five speed freewheel 14-16-19-22-26 without double shifting you get 7 gears: 35-46-54-63-75-85-115 Greg |
+1 on you can try bout anything with the mechanics of a bike and not fall flat...fall maybe but learn too. I have a short wheel base bent that I made and put a second derailer in the middle to get some lower gears and make a "mountainclimer' out of it.. as has been stated I got some overlay of gears but it still works. So I say if you have the time and materials and want to experiment, go for it.
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