The RadMini rims fit 20’’ tires. You can purchase replacement tires (either knobby Kenda Krusade replacement tires or slick Kenda Kraze replacement tires) and 20"x 4" replacement inner tubes for the Kenda Krusade or 20" x 4.25" replacement inner tubes for the Kenda Kraze, which are located on the Rad Power Bikes website's Replacement Parts page linked HERE.
The Kenda Kraze is a low-profile tire and uses a uniquely shaped tube: 20 x 4.25" with a wide oval shape, unlike standard fat tires which have a round cross section. The standard 20 x 4" tube used on the Kenda Krusade is too long for the Kenda Kraze, and can cause the tube to fold over on itself and tear inside the tire.
Since the tires and tubes are a standard fat tire bike size, most reputable bike shops that service fat tire bikes should carry replacement fat bike tires.
Ensure replacement tires have reflective striping or other reflectors, such as spoke mounted reflectors, are installed on your bike so the bike is adequately visible in low-light conditions.
NOTICE: If you do not have the experience, skill, and tools to maintain the wheels and tires, Rad Power Bikes highly recommends having a certified, reputable bike mechanic complete these procedures as well as any future maintenance, adjustments, or tuning.
Low pressure may result in loss of control, and overinflated tires may burst. Failure to always maintain the air pressure rating indicated on pneumatic tires may result in tire and/or wheel failure. Do not overinflate or underinflate tires. Inflate your tires from a regulated air source with an available pressure gauge. Inflating your tires from an unregulated air source could overinflate them, resulting in a burst tire.