I used standard CDX belts from Gates. Teeth number/length gradations (+2 to 5T) are not that dense as for chain, but I could manage selecting the suitable one every time by adjusting chainstay length and rear derailleur pivot position/incline.
Drag from belt flexing is definitely higher than from the chain. I know this, the belt tech is niche, and the target of my project is to eliminate additional gearbox in belt-driven bikes. Shifted belt drive keeps most of fixed belt drive advantages - smoothly driven, maintenance-free, rust-free, dry and clean all the time. Compared to fixed gear belt with planetary hub this drive is lighter and same efficient or better on all gears except direct drive with locked planetary internals.

Testing in dirt is coming, just do not want to break first prototypes before time.

Vitaly aka Dry Mechanic


Available belt lengths