[Donut]

I think the average is in the 30-40 lb range. We did Mecanum last year with very large standoffs and full size Toughboxes for each wheel (read: overkill) that weighed in at a whopping 60 lbs for the frame, wheels, gearboxes, and motors. This year we're trying out the Nanotubes from Andymark and the new Mecanums from VexPro, I think it should weigh in at around 30 lbs for it all.

Mecanum systems will tend to be a little on the heavier side due to significantly heavier wheels and an extra pair of transmissions. Direct drive should help keep the weight down some without chain or belt needed. Are you using stock gearboxes from Andymark or VexPro, or are these custom? There are quite a few low weight transmissions out there now that can save you some weight.