pic: ABS-122, shifter-in-tube chassis

[Cothron Theiss]

I'm really impressed with how compact this is. What size are those sprockets, by the way? I think you'll be fine leaving it at exact C-C, but since the chain is outside of your tube, it'd be easy to add a static tensioner after your first or second competition. Just for peace of mind you might want to print something that fits around or on the top of your motors to ensure the chain doesn't rub against the motors in the worst situations.