How do you get 4 x 9 or 4 x 10 speeds? I see only two front chainrings.
And the overall gear ratios don't seem high to support even 25 mph. With the largest chainring going only up to 30, a 30 - 11 is still small gear for road, right? What am I missing?
Thanks. I've owned 4 tandems, Gitane and ?? steel bar brake 3 speed in the 70's, 20 speed Bob Jackson and Trek 1000 trail tandem.