Guys,

I noticed my Specialized Toupe Ti rail saddle tends to slide back. I previously roughened the Ti rail with sand paper and as well as the clamp surface to increase friction. The seat post is a Canyon carbon. I previously torqued to 9NM max. I put a piece of red tape on the rail to spot the correct position. Now the red tape got pushed to the front which means the saddle slipped backward about 5mm. Is there anyway I can make the saddle stop sliding backward? I did notice the riding position changed and the lower back felt sore during the last ride.

Thanks

AX