Sure Grip offers Poly BD urethane around their most popular core. Core design is important because wheel flex must be kept constant over the entire surface of the wheel, our core design is intended to do just that which is why Sure Grip uses it in many of their performance wheels.
It's amazing that for the past 5 years the fugitive wheel has been the best selling wheel in the industry, something to think about when shopping around.
Grey, Orange - 89A (grips)
Black, Blue - 92A
Red,Pink - 94A
Green - 96A (hard for speed)