Originally Posted by
dsbrantjr
I agree, I never saw the point to having coating on both inners and outers, since the coefficient of friction of PTFE vs steel is almost the same as PTFE vs PTFE. In addition the coated inners are difficult to clamp securely unless the coating is removed. I just stick with lined outers and die-drawn (slicked) stainless inners. Sometimes more is not better.
Indeed! It's all a load of bumf. I had a few problems with dialling in my derailleurs when on the move, I later realised that the clamping wasn't sufficient as per your comment. I scratched off all the black Teflon coating at the anchor points and reattached the cables to the derailleurs. No problems occured.
I'm also toying with the idea of running some cheap Teflon lliner down the downtube for both derailleur cables and using some sort of rubber boot at the clamp bolts to stop water and debris ingress. A cheap DIY sealed cable kit.