Kreitler Rollers are known as the very best for good reason: the combination of a durable steel frame and precision-machined aluminum drums makes for a consistently smooth ride. The Kompact Alloy 2. 25 Rollers have all the features of the original Alloy Rollers in a smaller, lower-profile design. The 2. 25 rollers are the smallest diameter from Kreitler and provide the most resistance on their own, making them best suited to the strongest riders. The Kompact frame eliminates the extra material at the front and back of the rollers for a shorter overall length, which is easier to take along for race warm-ups and store when not in use. While the rollers will work with any style bike, the Kompact model is only compatible with wheelbases of 38 to 42in.