27.5 x 2.8" 12mm Thru x 157mm 650b Rear Wheels
This is considered a "plus" size tire. Shopping by tire size is based on a conservative estimate of if the rim is good fit for the tire. Manufacturers of tires and rims may make an "optimal" tire size suggestion that may vary from our listing.
12 x 157 axles are often called "Super Boost"