Large Reduction Single Speed Gearbox

[GeeTwo]

Originally Posted by ASD20

Are there any single speed COTS gearboxes with a reduction of around 22:1-25:1? So far the largest reduction I've seen is the WCP SS Gearbox, which can be configured to about 19.28:1. I know that there are some 2 speed gearboxes with that large of a reduction, but I would prefer not to spend twice as much money for a shifter with an unusable top speed.

My team is planning on using 8 inch wheels so the large reduction is necessary to get to a goal speed of roughly 7 fps.

Also because of large wheels, we're not using our gearbox for direct drive, but using chains with different sized sprockets for additional reduction.

[Ryan Dognaux]

The only gearbox we've found that will allow you to direct drive an 8" wheel at a reasonable speed is the West Coast Products Single Speed gearbox. I'm fearful for rookie teams that attempt to direct drive their KOP frame using 8" wheels using the Toughbox Mini's, it'll be hard to control at such a high speed on such a sectioned field.

Just wanted to add that I'm really impressed by the flexibility the WCP SS gearbox gives. 4 different pinion choices allowing you to basically go up or down ~1 ft/s at a time. We could go 7.5 ft/s or 10 ft/s by swapping pinion gears, love it!