Shimano CUES 9-Speed Derailleur Pull Ratio

Shimano's RD-U4020 9-speed CUES derailleur is their e-bike and mountain focused 9-speed derailleur. In this video, I'm going to measure the pull ratio on this derailleur.
Data: docs.google.com/spreadsheets/...
00:00:00 - Introduction
00:00:44 - Measuring
00:01:00 - Pull Ratio
00:01:39 - Range of motion
00:02:20 - Info card

[@r.taylorgarlock560]

I like the data-driven approach!
What then becomes the motivation for manufacturers to spec derailleurs as lower than their true capabilities? Purely safety factor engineering, or the more generally common mix of profiteering + model hierarchy performance engineering + warranty claim reduction 'safety factor' engineering?

[@Vasyapetrov666]

Oh maan! Great stuff, love it
tbh i think all cues rd is pretty same in motion (except cage length)

[@koparkakopie4580]

Hello, I'm looking for a cheap set. I was thinking about the new linkglide CUES CS-LG300-9 11-41T cassette. With cheap Acera RD-M3020 derailleur + old Alivio SL-M3100 shifter. My question is: Will this shifter work with the new CUES cassette? How do I check this? r3020 derailleur has interesting specifications.

[@truthseeker8483]

Well done. Low friction shifting sounds good.

Nice measurement and video. But it only tells half of the CUES story. Do you have any of the CUES shifters at hand to measure their actual cable pull?

[@boothsbikeprojects]

Thank you! I have a CUES 9-speed shifter and I'm working on a video. It looks like the cable pull is 3.51 mm for CUES 9-speed. I'll release the shifter video in a few weeks.

[@marccarter1350]

ahh, you answered my question, it will not work as a replacement for my aging 9 speed groupset! Shame