The dimensions of a scooter’s wheels and tires have a direct effect on the scooter’s stability and its ability to surmount obstacles.  Scooters are generally equipped with six-, eight-, or ten-inch wheels, although other sizes may also be used.  Some models use the same size wheels on both front and rear, while others may have smaller wheels in front and larger rear wheels.  As a rule, the intended use of the scooter should dictate the size of the wheels and tires.  Smaller wheels are generally found on front-wheel drive scooters intended for indoor use.  The larger the wheels, the more stable the unit.  Similarly larger and wider the tires provide better traction and greater capacity to manage obstacles such as curb cuts and uneven outdoor terrain. Those same tires, however, may make it more difficult to maneuver the scooter in tighter indoor spaces. 

Several types of tires are available for scooters.  Manufacturers generally offer a specific tire as standard equipment, with others available as extra-cost options.  Pneumatic tires have air-filled tubes and are similar to those found on automobiles.  Air pressure should be checked regularly to maintain proper levels, and tires may need to be replaced if punctured.  The addition of an anti-flat compound before inflation reduces the risk of tires going flat.  Pneumatic tires provide good shock absorption when properly inflated. 

Foam filled tires are similar to pneumatic tires, but include foam inserts rather than air-filled tubes.  These tires cannot be deflated and, therefore, require less maintenance.  They may be more expensive than pneumatic tires and may not offer a consistently comfortable ride.

The least expensive tire option is solid tires.  These tires require the least maintenance, but provide minimal shock absorption and are intended primarily for indoor use. 

Other issues in tire selection include color and tread depth.  Most tires are available in black or gray rubber.  Black tires are generally less expensive and have a longer life than do gray tires.  However, gray tires are specially treated to prevent the marking and scuffing of floors and walls that is common with black tires. 

Tires are available with differing levels of tread.  A deeper tread provides greater traction and improved ability to handle such outdoor surfaces as mud, gravel, and grass.  However, the treads do tend to track dirt and debris indoors.  Low-tread or treadless tires eliminate this problem, but should be confined to indoor use or limited outdoor use on paved surfaces.

Source: ABLEDATA Fact Sheet on Scooters