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@rob_f
Thanks for your repsonses.
I'm not massively fussed about keeping period parts on the bike. At the same time I have absolutley no knowledge of these newer brands. Everyone says Shimano are the market leaders nowadays, but back in the day I wouldn't have used their parts.
Basically the scenario is I have a frame that I had built for me in 1980, that I have started doing the ocassional time trial on. I also have a Holdsworth that I use for most of mileage. The Holdsworth was just a frame until January & I bought some second hand bits to get it up and running. Like the chainset & a shimano rear mech. The chainset has really worn out rings, & the SHimano changer is sloppy as hell. My thoughts were to put the SR chainset off my other bike on the Holdsworth & put something new/used on the tailor made bike. Also to get rid of the SHimano changer.
The thing is I'm not sure what is compatible with my racing frame. I know it won't take anything more than a 6 speed block (the same as the Holdsworth).
I get confused with all this talk of 10 speed chainsets etc Back in my day they were just single or double ring ......
So what are good makes of chainset now that will fit the bike. & is there a currently available rear mech that will work on my Holdsworth. I don't know if you can used indexed changers with 6 speed blocks ?