Replace or upgrade your rear wheel with this Raleigh 26" rear wheel, designed for compatible bikes using a 7 speed screw-on freewheel setup. Rim: Mach1 MC20. Axle Type: Nutted. With a 26x1.75 / ETRTO 559-21 rim size, it’s suitable for compatible 26" hybrid, mountain, city, or trekking-style bikes requiring a screw-on freewheel rear wheel.