Senior Member
Questions regarding shift/derailer compatibility seem to come up fairly often.
The question is frequently how to get Ergos to work with Shimano cassettes.
Many people have stated 10 speed Ergos will work with 8 speed Shimano cassette and derailer, or 9 speed using alternate cable routing/Hubbub.
Lennard Zinn stated 10 speed Ergos could be used with 10 speed Shimano cassettes by using a SRAM ESP derailer.
Zinn reported the (average) cable pull for his 10 speed Ergos as 3mm, but I see it listed elsewhere as 2.8mm.
DaveSSS states he measured the pull of his 10 speed Ergos as 2.5mm five times, 3mm twice, and 3.5mm twice, for an average of 2.833mm.
Zinn stated a 3.1mm average pull for his SRAM 10 speed shifter. This would mean an actuation ratio of 1.27/1.
DaveSSS stated a (uniform) 3mm cable pull for SRAM 10 speed (which he admits he hasn't measured for himself). This would give an actuation ratio of 1.32/1.
The actuation ratio for SRAM is listed (everywhere else I could find it) as 1.1/1.
Can anyone here clear this up?
If any of you have SRAM 10 speed shifters would you please be so kind as to measure the (per click) cable pull and report it here?
I would love to hear from two independent sources who agree with each other.
I'm going to assume DaveSSS measurements for Campy are (reasonably) accurate since he stated he measured tenths of a mm and his is off by hundredths of a mm.
The question is frequently how to get Ergos to work with Shimano cassettes.
Many people have stated 10 speed Ergos will work with 8 speed Shimano cassette and derailer, or 9 speed using alternate cable routing/Hubbub.
Lennard Zinn stated 10 speed Ergos could be used with 10 speed Shimano cassettes by using a SRAM ESP derailer.
Zinn reported the (average) cable pull for his 10 speed Ergos as 3mm, but I see it listed elsewhere as 2.8mm.
DaveSSS states he measured the pull of his 10 speed Ergos as 2.5mm five times, 3mm twice, and 3.5mm twice, for an average of 2.833mm.
Zinn stated a 3.1mm average pull for his SRAM 10 speed shifter. This would mean an actuation ratio of 1.27/1.
DaveSSS stated a (uniform) 3mm cable pull for SRAM 10 speed (which he admits he hasn't measured for himself). This would give an actuation ratio of 1.32/1.
The actuation ratio for SRAM is listed (everywhere else I could find it) as 1.1/1.
Can anyone here clear this up?
If any of you have SRAM 10 speed shifters would you please be so kind as to measure the (per click) cable pull and report it here?
I would love to hear from two independent sources who agree with each other.
I'm going to assume DaveSSS measurements for Campy are (reasonably) accurate since he stated he measured tenths of a mm and his is off by hundredths of a mm.
Senior Member
For a SRAM Red I get 26.7mm from 1 to 10, so that's 26.7 / 9 = 2.97 mm/shift
Measured by placing a clamp on the cable below chain stay and measuring the distance between the clamp and cable stop with calipers. The measured positions were reproducible to 0.1mm. The derailer stops were loosened to prevent them from influencing the measurement.
Since the cable is more taught in the big cog than in the small cog, the cable travel at the shifter is probably a bit more than measured at the chain stay due to elasticity in the cable and housings.
Measuring the face to face distance between cogs with the caliper I get 20.2 mm for 6 or 20.2/5 = 4.04 mm/shift so that gives an actuation ratio of 1.36:1
Kind of splitting hairs here.
Measured by placing a clamp on the cable below chain stay and measuring the distance between the clamp and cable stop with calipers. The measured positions were reproducible to 0.1mm. The derailer stops were loosened to prevent them from influencing the measurement.
Since the cable is more taught in the big cog than in the small cog, the cable travel at the shifter is probably a bit more than measured at the chain stay due to elasticity in the cable and housings.
Measuring the face to face distance between cogs with the caliper I get 20.2 mm for 6 or 20.2/5 = 4.04 mm/shift so that gives an actuation ratio of 1.36:1
Kind of splitting hairs here.
Senior Member
Looigi, thank you. Did you measure individual clicks or just the range?
Either way your input is appreciated; I'm just wondering if the pull per click was uniform (as DaveSSS stated) or non-uniform like Shiman and Campy (as Zinn's statement would imply).
Either way your input is appreciated; I'm just wondering if the pull per click was uniform (as DaveSSS stated) or non-uniform like Shiman and Campy (as Zinn's statement would imply).
Senior Member
I only measured the total movement between 1 and 10. It's conceivable it's not constant from end to end but judging by the lever arm on the RD it couldn't be much different.