Originally Posted by
kenners
I have a physical condition that inhibits my muscles in my hands. Therefore, I can't use handbrakes.
so, I just modified the bike. Instead, I have a coaster-brake hub. I have attached a picture of me riding. If you can blow it up, you'll see the chain and the coaster-brake hub in the back. The hub is a two-speed Sturmy-archer kickshift coaster-brake. the problem is I don't seem to be getting the right tension on the chain.
Thank you for any suggestions .
OK, so it is a retrofit. Are the rear wheel dropouts vertical or horizontal? Also, are any of the guide pulleys that the chain is routed around adjustable? If so, you should be able to tension the chain that way even with vertical dropouts.
However, even with sufficient tension on the chain, any twisting of the frame while riding could still derail it because the frame and chain are very long.
Using a rear cog with a built in chain keeper would at least keep the chain from derailing off the outside. Shimano makes such cogs for the Alfine hub. They are the standard 3 lobe type that would fit your two speed.
