13-1/2 diameter, 4-spoke. Spoke is Chrome and grip is Black Foam. Grant Challenger Series: The wheels feature Grants patented exclusive dual-plane spoke design. The 3-dimensional hi-tech, dual plane 4-spoke design offers a world class look. The wheels have extra thick textured foam cushioned grip. The spokes are CRS steel in matte black, satin silver or brilliant chrome. *Will not work with steering wheels equipped with airbag. Installation kits are sold separately.