On Saturday, September 29, 2018 at 2:01:49 PM UTC-7, Emanuel Berg wrote:
David Scheidt wrote:

Typical torque spec for a 12.9 grade 10mm
socket head screw, which is what has an 8mm
hex socket, is 80 NM (~60 foot pounds).
Shimano pedals are 35 or 40 NM (25 to 29 ft
pounds), as I recall. If you can't do that
with a hex bit, you are not competent to work
on anything.

40nm, isn't that the typical casette torque?
You are supposed to do that with an 8mm allen
wrench? Not that I ever saw this situation
first hand!

BTW I don't think I put the pedals in that
hard. I have a torque wrench but for sockets,
not an open spanner - unless you can buy that
as a separate part and plug it in?

But I doubt they (the pedals) will get much
deeper anyhow...?

I'm not sure if I'm following, but all you do is put an 8mm hex socket on your torque wrench. https://images.homedepot-static.com/...77-64_1000.jpg Or buy an el-cheapo 8mm pedal wrench and just give it a good hard push. https://tinyurl.com/yc4n8z28

As for standard 15mm open-end pedal wrench, I never once saw a mechanic use an open end torque wrench, and historically, I just reefed on it a bit and called it good. Maybe others have a more scientific approach. I had one pedal come loose, but as Frank mentions, with bearing precession, the pedal should tighten. My pedal bearings were probably munged, or there was some other issue that caused the pedal to loosen besides low tightening torque. I bent the spindle on one of those pedals, too.

-- Jay Beattie.