Originally Posted by
racefacelefty
I modified a 12-25 to remove the 12, 13 and 14 and acquired a oneupcomponents.com mini driver and shark 10 tooth cluster (
https://www.oneupcomponents.com/prod...t-cluster-1x11) so I'm running a 10, 12, 14, 15, 16, 17, 18, 19, 21, 23, 25. Nice close ratios with little steps until speed is really high, then we have big steps but a very high top ratio - like a 57-11.
The 39 was on the border of just usable with the 25 but the 36 leaves us hardly using the 25.
What are your thoughts on a right sided drive and a SRAM Eagle setup? Looking at gear calculator, an Eagle setup would actually be very similar to my current tandem setup, but it would be a 1x (I know, a lot of tandem folks cringe at moving from a triple to a double, but I've used a double for years without problems and I'm looking at a single!). This would open up a pretty simple right sided drive.
Anyway, this link lays out the gear ratios:
HTML5 Gear Calculator
What I'm wondering is, would I need to use a SRAM mountain crank to get a long enough spindle for the stoker? I'm not sure I can machine a part to extend my spindle like you did! I was thinking I'd use the inner ring to do the timing chain and outer for the drivetrain.