hamrack-
Nah, I looked at NBT type tools but I still want them to use allen key so I can use them for disc rotors.
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Actually their photos show it for disc rotors too. I'm not sure I'd trust it to do them.
EDIT: Some fucker has done the maths... maybe it will be fine.
"Assume a 170 mm crank arm and approximately 1:1 gearing (e.g., 34T front and 32T rear). 40 Nm / 0.170 m == 235 N == 52 lbf. So that end is really easy to do on a pedal.
Let’s check the other end: the plastic arm looks like it extends almost out to the edge of the cassette, so let’s assume 50 mm radius. 40 Nm / 0.050 m == 800 N. Let’s assume the plastic part is 40 mm long, 5 mm thick, 20 mm across, made of a common non-filled but relatively tough plastic like acrylic, point load on the end. Rough math says the total deflection of the beam will be well, well less than 1 mm.
The derailleur hanger can probably suffer 800 N (180 lbf) along that axis without too much concern.
So, as a first guess: should work fine."
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hippy
Cheers, Looks good, I'll keep it in mind, but only want single-sided, ie. Shimano though (trying to get it as light as possible).