#25 Chain

[BeardyMentor]

I build silly tiny electric cars and race them. I have run #25 chain for hundreds of hours with motors equivalent to 6+ CIMs to big (by FRC standards, 11") pneumatic tires. and it works just fine even under shock loads like getting put into the wall at 20mph. I even did some testing with 6.5hp brushless motors spinning a 20 tooth #25 sprocket and it worked fine for FRC time scales of less than a couple of hours of operation. With that said, I would swap over to #35 if at all possible. In my experience it is much more forgiving in fabrication tolerances and dealing with the unexpected situations like those that are common in FRC like getting repeatedly rammed, stalled motors, slight shifting of sprockets etc.