T
TWalker
Guest
Shifter for rack mounts with full freewheeling capabilities for engine and pedaling using one existing freewheel cluster.
We know a simple bike/BMX chain will hold up to engine torque as seen with SBP shifter kits.
Why not run a rack mount with bike chain to the tallest 3 gears on your existing freewheel and leave the bottom 3-4 gears for pedaling?
Ive already did a test run a while back by sliding my Titan drive gear to the right side and running a bike chain to the tall 32t gear, it works but I had no real tensioner or deraileur to change gears and it slipped off, I ran out of time for the project and took it off.
1. You need the front freewheel system ala SBP (which I used) because the engine will spin your pedals with this setup.
2. Im looking at the Titan and possibly the Staton Inside drive as potentials. The Staton would need a longer shaft. See the pic below. But the Titan will work as is with a 20t middle sprocket and a deraileur. 18:1 reduction (titan PTO, 20t middle gear and 32 tooth freewheel gear)
3. A common shimano mega-range freewheel is best I believe going from 9t to 32t range.
With this set up you have 3 gears for engine and 3-4 for pedaling or 6-8 gears if you utilize both sprockets on an SBP front chainring.
This is a great set up and I was keeping it quiet until I got perfected but I figured I would throw it out for some of you genuises to see if we could get er done.
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