I just got some in the mail and haven't yet tried them. They specify 7 nm, but I assume they mean 7 Nm. (7 nanometers is a unit of length).
So assuming your bolt is steel, 7 Nm should be fine. (You have to be more careful with titanium.)
I'm kind of surprised it is that little. My whole point in getting them was to clamp better than my internal cam quick release so that my rear wheel doesn't slip in a horizontal drop-out. Now I wonder if it would make things worse.
If the axle bolts (and heads) are steel, I presume the only thing limiting it is how much clamping force it would take to tear the bolt out of the threads on the aluminum cone-nut opposite the bolt-head.
Originally Posted by
filipw1990
Shimano for QR skewers recommends 5 - 7Nm but it is not clear for me. Is this recommended torque before or after clamping? I mean I have to tighten skewer to 5 - 7 Nm and then clamp skewer or tighten and clamp with 5 - 7 Nm force?
Torque isn't force, but is the cross-product of force and moment arm. So it is measuring how tight the bolt gets put on. However, the relevant thing for a quick release is the clamping force you apply when it is in the on position. When the lever is in the off position, the torque is zero, or pretty close to zero. So I have no idea how it could refer to that. I also have no idea how you would be able to measure torque for a quick-release.
Maybe it is the amount of torque it takes to undo the lever after it is clamped in the on position. (If so, 7 Nm seems rather feeble.)
I may just put mine on and torque it to about 10 Nm and see if it holds.