As a tall and husky cyclist, at 220lbs, riding a modern full suspension bike, my seatpost protrudes approximately one kilometer from my bike. I've had a lot of problems with seatpost slippage.
I've already burned through two seatpost collars tightening them down as hard as I can, so I've moved on to looking for larger collars to use. The Surly collar is burlier than a lumberjack's burly beard.
My only regret is that I am tragically stupid and unable to order the right size for my bike, so I had to return it. I need a 35mm and I don't think they make one that big.
I bet it does the job like a mother, though. It's solid and has a huge screw, just like any prison shower.
My bike came with a crappy seatpost clamp that kept slipping. I got this Surly Constrictor and it has held up well. It is big and well made. I am happy with the job it is doing and I recommend it to anyone with a slipping clamp.
I had a Thomson 31.8 clamp that would not hold my Thomson 27.2 post, so I had to crank it down above the recommended 2.5NM just so that it would hold. When I did that the post squeaked with every pedal stroke--it was awful. I got this b/c it is not too expensive. I had to do something! It is not an attractive part, unlike the Thomson, but this one worked! No more squeak!
I have snapped several bolts on my seat post clamps. Surly is $$ because their stuff is tough. I paired this with an ETEN E10 dropper post so I can leave this clamp locked in always. Is burly cuz it is a surly. Strong and has handled all abuse from jumps.
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