The Whiteout frame uses a 197mm rear dropout spacing to work in conjunction with a 12mm thru-axle 190mm rear hub. This gives unmatched strength and stability. By utilizing 197mm spacing, the Whiteout can be built as either a super light race bike with "narrow" wheels, or a high performance adventure rig with the widest fat bike rims and tires on planet. We've built these up with everything from 27.5+ all the way to 5 inch tires on 100mm wheels. The Whiteout frameset is designed in conjunction with the 9:ZERO:7 197mm convertible hub set (compatible with both the aluminum 190mm and carbon 197mm frames)