Get Skateboard Wheels That Last !  When you pick a set of skateboard wheels, consider size and hardness.

 Durometer  

The durometer of a wheel is the measurement of its hardness or resistance to penetration. Therefore, the durometer rating you'll find on your wheels will read "90A" or "75A" , with harder ratings equating to harder wheels.

75A-87A Skateboard Wheels: A good choice for longboards, cruising and hill riding. Great for rough surfaces.

95A Skateboard Wheels:  Ideal for riding down the street or tackling tough spots. 

97A Skateboard Wheels:  Best for all-around performance on smooth surfaces such as skate parks, ramps and pools.

100A Skateboard Wheels:  Used by the pros, this wheel is very hard, with little traction.

Diameter

The diameter or size affects your boards top speed, acceleration and ability to turn. Wheels are measured in millimeters and typically range from 49-75mm.   Bigger wheels give you a faster ride, because a single rotation will cover more distance. However, it's more difficult to make sharp turns on larger wheels and they don't accelerate as fast. Here are some suggestions for wheel size based on your type of riding.

48mm to 55mm Skateboard Wheels:  Choose these wheels if you plan to skate streets, skate parks, and bowls, or if your a smaller rider.

56mm to 60mm Skateboard Wheels:   Choose these wheels if you plan to skate streets, skate parks, bowls and vertical ramps, or if you're a bigger rider.  

64mm or larger Skateboard Wheels:  Choose these wheels for specialty rides, including longboards, or for riding on hills and dirt roads.

Bottom Line:   The larger the wheels, the faster you go, the smaller the wheels, the closer to the ground you'll ride and the lighter your board will be. It should also be noted that smaller people tend to do better riding on shorter wheels, while larger people might feel more comfortable  on bigger wheels. This is a matter of riding style and personal preference, so use these ranges as a starting off point and determine the best for your own set-up. Wheels are important , but remember the're only as good as their bearings!!