Belts 9mm or 15mm?

[weberr]

Only our Rookie year did we use chain, in 2011. Since then we have used belts with a 99% reliability of our drive train. In 2014, we went to 9mm wide belts figuring that a factor of safety of 5 was enough, as we were trying to fit them in 1 x 2 tubing. The small sprockets and the narrow belts just didn't hold up in defensive play in Rebound Rumble. We quickly became experts at changing a complete drive train side in 5 min, going through 32 belts that year.

Since then we went back to the 15mm belts and use 1.5 x 2.5 tubing to fit them and the sprocket in. Both 2015 & 2016 we had NO drive issues nor repairs for the lifetime of the robot.

So in short, if you are going to use them for drive and plan on doing alot, 15mm wide are the only way to go.