Airless flat-free wheels and adjustable width axle make the Swift the best sit-on-top cart on the market. Slide your boat easily on to, or off of, the coated and cushioned uprights and away you go! A super beefy anodized 35mm axle can take all sorts of abuse. Adjusts from 8.5" to 18" scupper holes. Width 24". 35 mm axle. Weight 7.5 lbs.