Re: FD Roller, Material?, Method?
My oak roller is installed and functioning. It's working acceptably. I'm having some slipping, but I haven't had a dry day yet, so I expect that to improve.
In your case, cannonball2, the roller is limited in size because your only gearing is that of the roller-to-tire. Since I'm using an intermediate shaft, I can size the roller larger, and then I can adjust the ratio by pulley sizes.
I also attach the roller to the shaft by a different method. I sandwich a pin going through the shaft.
My next experiment will be using 2 4"to6" diameter aluminum cups (or something).