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Stem Shifter derailleurs compatibility with friction shifters

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Stem Shifter derailleurs compatibility with friction shifters

Old 02-12-10, 09:30 AM
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Stem Shifter derailleurs compatibility with friction shifters

I'm brand new to bicycle building and I'm wondering if I took the derailleurs off of a bike with stem shifters and used them on the bike I'm building, but with friction/downtube shifters. Will the derailleurs work properly? And, assuming they are compatible, the cable from the downtube shifters to the derailleurs would obviously be shorter and routed differently than stem shifters, but are there any other differences when it comes to installation?

Sorry if I'm using the wrong terminology or if this sounds confused...I'm VERY confused when it comes to all this, and I welcome the proper terminology. I came here for an education. Thanks!
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Old 02-12-10, 11:10 AM
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If the downtobe shifters are also friction shifters, then they should work. If the downtube shifters are indexed shifters, then they will likely not index the derailleur throught he gears properly. However, most inded down-tube shifters can be switched to friction mode.

As for cable routing, use the same routing as on the downtube-shifter-bike previously, but go drop $10 on new cables and make the bike work like new.
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Old 02-12-10, 02:18 PM
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I didn't even know there was such thing as down tube index shifting. Okay, so basically there shouldn't be a problem with derailleur compatibility between stem shifters and down tube shifters since they're both friction shifters? Other than the cable length since stem shifters are further from the derailleur than the downtube...
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Old 02-12-10, 02:33 PM
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The cable routing will probably be different - most stem shifters have cble housing running from the shifters to the down-tube of the frame where they meet cable-stops, then run bare under (or over) the bottom bracket to another cable stop on the chainstay, and then a new short run of housing guides the cable into the derailleur.

Downtube shifters usually have bare cable exiting - no housing until you get to the cable stop on the chainstay.
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Old 02-13-10, 04:05 AM
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Thanks, LarDasse.
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Old 02-13-10, 10:29 AM
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My trek 1420 had a little D ring hook that you used to toggle between index and friction.
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