[fargus111111111]

Belt vs chain, in my 4 years, relatively short compared to many of these people, I have not seen a lot of difference if the shafts the belt/chain is on are attached to the same plate, when you start getting joints in between it gets a little hairy with belts, but we have only broken a chain once, and that was on our t-shirt shooter while driving in the grass and all its drive is 25 chain, our 2012 robot, a very similar design, uses 35 chain from the gearbox to the center axle, then 25 from the center axle to the end axles and we have never had any problems. On the belt side, the past 3 years we have used belts in the drive and never experienced any issues, our 2014 bot is still running all original parts, except the wheels. 2014 and 2015 we used the standard kit base and 2016 we used a modified version of the Rhino Track system. (custom fit to our Breckoflex tracks) We have used poly cord in the past as well, the last time was 2012, but the stuff is quite useful for intakes, our 2006 robot uses a crazy pulley system and a bunch of poly cord to run the intake and spiral ball storage system off one motor. Poly cord can't take too much torque, but sometimes that is a good thing and the cord is not near as picky about alignment as long as you have deep pulleys and if needed you can even make it turn on multiple planes.