FWIW, I've been palping Worksman INBs offroad for some time now. The center of the crank on my INBS is almost exactly the same height as on my turn-of-the-century Kona Hahanna hardtail (size 18" frame, turned full-rigid); the effective top tube length is less than 1" shorter. The main geometry differences are the slacker head- and seat-tube angles and the longer chainstays on the INB vs the Kona. I run 175mm and 180mm cranks; pedal strike has not been a problem for me, i guess b/c I've been riding trails for a long time, so I avoid obstacles, conserve momentum, and otherwise do my best to sustain "flow". I do not crash too often....
I shoot for around a 50" gear for offroad on a singlespeed; this is just slightly under a 2:1 ratio front to back sprocket, on a bike with 26" wheels. Everyone I know who has run an IGH offroad has blown it up, exceptions being Rohloff and Shimano Alfine 8s. Apparently, the NuVinci hub is entirely trailworthy, and i'd like to try one. Unfortunately, all of those hubs are too wide to run in most cruiser frames without modification. The 2-, 3-, and 5-speed IGHs that will fit in the cruisers' dropouts tend to blow up under high-torque situations common in offroad riding, especially with gear ratios <2:1. I am about to try a kickback on a bike that i intend to ride offroad a bit, but i have a SS back up plan for when/if I fry the kickback....
HTH,
Rob
I shoot for around a 50" gear for offroad on a singlespeed; this is just slightly under a 2:1 ratio front to back sprocket, on a bike with 26" wheels. Everyone I know who has run an IGH offroad has blown it up, exceptions being Rohloff and Shimano Alfine 8s. Apparently, the NuVinci hub is entirely trailworthy, and i'd like to try one. Unfortunately, all of those hubs are too wide to run in most cruiser frames without modification. The 2-, 3-, and 5-speed IGHs that will fit in the cruisers' dropouts tend to blow up under high-torque situations common in offroad riding, especially with gear ratios <2:1. I am about to try a kickback on a bike that i intend to ride offroad a bit, but i have a SS back up plan for when/if I fry the kickback....
HTH,
Rob