Be careful with the M2 seat shifter. There are posts on ST about failures. I had one. It never failed but was poorly made. The rails on the shifter did not match the rail width on the saddle or the clamp on the seatpost. The rails were not parrallel. It had to be forced into place, not a good thing. I used mine to get more seat height on a Softride SE7 and never moved it once it was in place.

Other posters have stated that during rides the quick release on the shifter broke in half.

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Paul