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Front shifter controlling rear derailleur
I am building a recumbent bike with a mid-drive gear/suspension pivot
made from a rear wheel hub. I have fabricated a dropout for the rear "triangle" that has a derailleur mount. I don't have any extra rear shifters laying around, but I do have an SRAM ESP 9.0 twist grip set. I wanted to find out if the front shifter could pull a rear derailleur through at least 4 gears (which is what I will have on my mid-drive). I connected a cable and discovered that it will pull through 6 gears, so I have enough range. The shifter is a "micro stepping" type with a bunch of click stops between the 3 chainring stops. It looks to me like the click stops move the derailleur (a Shimano unit) exactly one gear per click (the mid-drive is an SRAM 8 speed cassette). Unfortunately, I am not finished with the bike yet so I can't ride it to check to see if it works pulling a chain. Does anyone know if it will be possible to make it line up and shift the gears properly? Thanks |
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#2
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Front shifter controlling rear derailleur
hmmmm wrote: I am building a recumbent bike with a mid-drive gear/suspension pivot made from a rear wheel hub. I have fabricated a dropout for the rear "triangle" that has a derailleur mount. I don't have any extra rear shifters laying around, but I do have an SRAM ESP 9.0 twist grip set. I wanted to find out if the front shifter could pull a rear derailleur through at least 4 gears (which is what I will have on my mid-drive). This should work, but it may not index 100% correctly. SRAM's ratchets for the front shifter might be fine enough to allow you to hit the four cogs on your mid-drive and then the floating pulley on the Shimano derailleur will allow the chain to run fairly noiselessly. The perfect solution would be to get a "rear" shifter from a SRAM non-ESP set, similar to this: http://harriscyclery.net/site/page.c...=49&SKU=LD4755 An equally good solution would be to control the mid-drive derailleur with a friction thumbshifter. These cost a couple bucks at the most. Jeff |
#3
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Front shifter controlling rear derailleur
Thanks for not laughing!
I will be using an SRAM derailleur on the rear end, and got the shifters I have really cheaply, so I wanted to try to use them. I could use a friction shifter on the mid-drive derailleur, but it wouldn't match the other side and would look a little weird. I guess I'll try to use what I have and if I don't like it, I'll get a Shimano compatible shifter. Actually, I have never had a bike with twist shifters and I'm not sure I like the idea. Maybe I'll decide to dump both in favor of trigger or bar-end shifters, both of which I have on other bikes and like. Hmmmm. |
#4
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Front shifter controlling rear derailleur
hmmmm wrote: Thanks for not laughing! You want a laugh- check out this 20-year-old photo of me: http://www.pacifier.com/~jwills/Gallery/index.html I will be using an SRAM derailleur on the rear end, and got the shifters I have really cheaply, so I wanted to try to use them. I could use a friction shifter on the mid-drive derailleur, but it wouldn't match the other side and would look a little weird. Buddy, you're building a recumbent. It's going to look weird. Get used to it. I guess I'll try to use what I have and if I don't like it, I'll get a Shimano compatible shifter. Actually, I have never had a bike with twist shifters and I'm not sure I like the idea. Maybe I'll decide to dump both in favor of trigger or bar-end shifters, both of which I have on other bikes and like. Hmmmm. Bar-end shifters are the best, bar none. However, I don't think they will work with the SRAM x.0 derailleurs. There was some discussion about this on the Bentrideronline forums, but I can't remember the details. Jeff |
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