Originally Posted by guardrail
I have a Red 2004 Revive which is 8speed - rear cassette only.
In Europe they build a 21 speed with the SRAM Duo-Drive.
I'm about convinced I'm going to try to get a rear wheel with the DuoDrive in it, along with the shifter and probably the derailuer. I need some better hill climbing capability.
Has anyone investiaged this?
I did find the DuoDrive but its either 32 or 36 spoke and the bike rim is 28 so the rim has to go anyway.
No derailer change going from 8 to 7, the interval control is in the shifter. IF you switch to the SRAM shifter that has the gear and derailer on one hand, you have an SRAM/Shimano derailer incompatibility problem.
No point in replacing the shifter anyway if you covert to dual drive 8 instead of dual drive 7, just get a 3 speed SRAM shifter for the left to operate the gear hub.
Schlumpf Mountain drive is another alternative to the Dual Drive-slightly more expensive but gives a broader ratio range and more hillclimbing capacity.
Front der triple could be a less expensive upgrade.
Schlumpf + 2 speed fder gets you 32 speeds.
BTW, Shimano's 3X8 dual drive equivalent is supposed to be available this summer so they may have a Shimano standard single hand shifter for their Nexave 3X8 drive if you prefer it in one hand.
Last edited by meb; 06-06-04 at 12:12 AM.