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Cable pull of the SRAM Force 1 Rear Derailleur

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Cable pull of the SRAM Force 1 Rear Derailleur

Old 06-02-17, 10:52 PM
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scarleton
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Cable pull of the SRAM Force 1 Rear Derailleur

If I cannot find the right SRAM shift-break control to work with both SRAM Force 1 Rear Derailleur and cantilever brakes, I am considering useing the Dia-Compe 11s Road Downtube Shifters. Velo-Orange's web site says this so that you can determine if the derailleur will work:

To calculate the amount of total cable pull your drivetrain requires use the following formula:
total cable pull = cable pull of intended shifter * (s - 1), where s is the number of speeds of your cassette. If the total is less than 50mm, these shifters should work.


So I am wondering what is the cable pull on the SRAM Force 1 Rear Derailleur when using a 10-42 cassette. Anyone know?
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Old 06-03-17, 08:23 AM
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reddog3
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Why not use the compatible Force shifter?


https://www.universalcycles.com/shop...&category=2975
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Old 06-07-17, 02:12 PM
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scarleton
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That is an option, but it is $100 more than the downtube shifter and more importantly, I think it would be very cool to have a 1x11 with a downtube shifter, not something you see every day
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Old 06-08-17, 08:56 PM
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These shifters do not look like they are indexed so it's find and grind which is OK but be aware of what they are. But - I'm not sure why you can't use any old 1970's downtube shifter as typically they will keep pulling cable as you pull the lever back until it hits the frame. From this well-used site,
A guide to rear shifting | Cycling UK
an old shimano 6spd shifter pulls 3.2 mm per shift and and an SRAM 11spd (see here):
Art's Cyclery Blog Science Behind the Magic | Drivetrain Compatibility
pulls 3.1mm. So try and get an old school downtube friction shifter and give it a try - I know I have quite a few in my old parts bin so 'm sure most LBS' do too. But basically you want an old shifter that pulls a lot of cable per shift so it does not need too much arc - shimano 6spd (with SIS turned off) may be OK or some perhaps old Shimano 600 arabesque?
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Old 06-09-17, 06:48 AM
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As I asked myself why... I thought of how badly I wanted one of these when I was a kid. I hope you find something that works...

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