How about the Schwalbe Super Moto-X? http://www.schwalbe.com/en/tour-reader/super-moto-x.html The come in 27,5" in bigger and biggest.
And wheigh over a kilo each.
All right. The Big Ones are less than half of that - according to Schwalbe. But imagine the momentum of a set of 2.8" Moto-X's when you get up to speed..
@drøn started
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How about the Schwalbe Super Moto-X?
http://www.schwalbe.com/en/tour-reader/super-moto-x.html
The come in 27,5" in bigger and biggest.