have built my grass cart and tested it quite a bit this spring here in beautiful indiana.
soon as the frost was out of the ground we were running it. if anyone is familiar with the mid u.s. you know this is when the ground is the softest and muddiest. quite impressed with the 22x8 tires all around, has excellent floatation on the soft surface (doesn't leave any tracks or ruts), and beat the bigfoot tire weight by a pound. best part is no tire wear running on grass. cart dimensions are 60" wide by 70" long, monofork with 30 degree layover steering. first time out we hit 48 kph with a 4 meter windsurfer sail and finally hit 50 kph about a month later. are these respectable speeds for the surface involved? pretty crazy feeling on the rough surface, can't imagine going faster but definitely will be trying. best part is the power slide you get when gybing, love it.