Update on all this.
I'm running downtube shifters
OEM was 7spd SIS
When the rear shifter wore out I found NOS 8spd on eBay and converted.
Years back when Nashbar was closing out their 8spd wheelsets I bought several so I have the wheels to play with.
Via a more than helpfull hand from the local (top end)LBS I discovered the 157Q factor/tread for the Polyvlant (reconstituted sugino rd600 triple)super compact double will work fine with my rx100 front derailleur.
(In the process I discovered the stronglight compact I installed 7 years back was not exactly compatable with the taper on the SH24 BB I installed at the same time. Shall we say the Q factor was somewhere around 164!
So; I learned something in the process about checking the fit of cranksets to BB)
LBS suggested going with an older sis style deore as the changer on the rear. The road derailleurs can be screwed (B Screw)in enough to work fine with the 30t but going to a 32 is a bit too much.
Last edited by Ranger63; 10-03-11 at 08:04 AM.
Reason: spelling