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is there a measurable difference in clamping force if you spin the clamp around to the front?
In an ideally designed clamp, zero difference. Even in some of the appallingly badly designed clamps passed off as acceptable by major component manufacturers, a negligible effect way below the resolution or accuracy of your torque wrench, and of uncertain sign.
With normal seat clamps and the split at the back of the seatpost - is there a measurable difference in clamping force if you spin the clamp around to the front?
I've done this to the grrl's bike to better mount a rear light with saddle bag but I wondered if I might need to up the torque at all to cope with the bolt being on the front of the tube away from the split.