18x3.5 Blackout 48 King Spoke Front Wheel Rim Single Disc 37-721 Harley Ultima18x3. 5 Blackout 48 King Spoke Front Wheel Rim Single Disc 37 721 Harley Ultima Part # 37 721 Fits models with 1" or 3 4" bearings with single disc applications Front 18" x 3. 5" King Spoke Wheel with Black Rim, black Hub, and Black Spokes 1" Sealed Bearings and reducers, part# 33 295, to allow for use on models with 3 4" axle 2. 25" Center Hub Tech Note: This is a universal fit wheel with 1" bearings with adapters for 3 4" bearings. Re spacing may be