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I am having a nightmare with a right shifter / RD on my GFs bike. So any input would be appreciated.
The RD is an old 6 speed Suntour. It had DT friction shifters. I switched them to thumbies, the right using one of those mount things:
It wasn't great. 1) the ergonomics of the lever weren't that comfortable 2) it was hard to push all the way into the largest rear sprocket (part may be the ergonomics), 3) I ultimately wanted a indexed one for simplicity, 4) there was no barrel adjuster / step to hold the cable properly.
I bought a cheap thumb shifter. This one:
The problem I now have is that going up the block (smallest sprocket to largest); 1) it is very heavy on the thumb to shift, the last/largest is really tough, 2) going from the smallest to the second smallest (6 to 5) the derailleur won't shift - you have to go up and then back down. 3) the indexing overall is not really on point...
... if I increase the cable tension then the "indexing" gets worse and the chain won't return to the smallest sprocket (no. 6). If I loosen the tension then the chain won't make it to the largest sprocket (no. 1). I have spent ages playing with the H and L delimiter screws so I'm confident they are correct. Plus if they are not in the right place the chain jumps off easily and being a massive thick chain is a fucking PITA to get out.
My thoughts are as follows:
1) I am expecting too much from a 6 speed system.
2) the shifter is cheap and plastic and therefore simply isn't very good.
3) the penultimate ferrel on the chainstay is not the correct shape for the braze on so there is some play.
4) the cable housing is a little short (I used the pre-cut length included in the pack).
Any thoughts?