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I've bought a giant TCR with ISP second hand. The previous owner had trimmed the seat, so I've added 7.5mm of spacers to make it fit me. Initially I had no issues. I moved the seat backwards slightly along the rails and since then my problems began! Basically one day when riding I noticed the spacers rattling together. When I stopped to check, I could see a gap between the top of the seat post and the first spacer, so they were able to move around. So what seems to be happening is that the clamp is able to move back and forth, even when tightened to 4Nm. I will tighten the clamp, however I assume that when I move my weight back on the seat, the clamp just slips. So here's what i've tried:
- Running just one 5mm spacer - the seat still moves, there is just no rattle heard
- Swapping clamps - the longer clamp seems to hold a little better, but still slips
- Friction paste on the post - no difference

So basically I want to know - is this a common, known problem with the giant ISP clamps? Has anyone else had this problem? What can be done to fix it? Are there alternative clamp designs that will fit my seat post? Any help/advice is much appreciated!
 
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