the bike is a '86 Trek, DT friction shift, Shimano 600 RD (non index, RD 6207). It originally had a six speed 14-28 freewheel.
I've replaced the wheel set and am running a 9 speed drivetrain. I tried a new SRAM 9 speed chain and a new Sram 12-26 9 speed cassette and all was great.
I wanted to get a lower low for some upcoming hilly rides (I have a 53/39 up front), so I swapped in an old 11-32 mtb cassette and it seems to be working okay.
Problem - the smaller cogs on this old cassette (which is riveted together, not discreet sprockets) are shot, and the chain skips on them. I was all set to buy a new SRAM PG-970 steel 9 speed mtb cassette, now on sale at Performance for $26.
Advice #1 : They offer it in 11-32 and 11-34. I realize a 32 is probably pushing it with the old 600 RD, no max wrap is stamped on it but I am assuming it'd be 28t. Would I be nuts to go for a nice low 34t?
Advice #2: I also have a gently used 10 year old Shimano Deore LX SGS M570 Rear Derailleur I could toss on the Trek - longer cage. Would you go that route, or just stick with the 600 short cage if it is working?
Advice#3: If sticking with the old 600RD, the lower pulley is shot - almost worn down to the nubs. I would replace it with the Aluminum ones, but how do I know whether to go with 10 or 11 teeth? The original pulleys look to be 10t, but that was with the old six speed chain. Should I get 11t pulleys for the nine speed set up?
Thanks for any words of wisdom.