[maclaren]

I agree with replacing the rollers with idler sprockets it would be much more efficient. The noise is the chain lobes bumping over the rollers. Noise like that means inefficient.

I'm guessing from the picture that it's #35 chain?

What size wheels are you running they look about 4"?

What shifting method are you using. Two dog shifters, a ball shifter, or what?

What speeds (FPS) are you estimating from the different gear ratios?

I have to ask do you really need four gears? I mean you don't have a huge amount of traction so having a really torquey gear ratio could mean that you don't have enough traction to actually realize that troque and your wheels would just slip out. And how fast do you really need to go the field is only 50 something feet long so 12-15 FPS means so can get across the field pretty quick. Don't get me wrong a four speed transmission is really cool and I respect the engineering and the maching that goes into the effort.

I would also be interested in the total weight of the system and the weight of the transmissions assembly.