Belt Sizing Guide 255-5m-11 Belts: This is stock for the Exway X1 Pro. Use with the stock 36T pulley. 255-5m-15 Belts: This is stock for the Exway Wave, Exway Flex, and Exway X1 Max. Use with the stock 36T pulley. 280-5m-15 Belts: This is stock for the street configuration Exway Atlas 2WD and 4WD. Use with the stock 36T pulley. These belts can also be used with the Exway Wave, Exway Flex, and Exway X1 Max in combination with the 44T pulley. 300-5m-15 Belts: This is stock for the street configuration Exway Atlas Pro 2WD and 4WD in combination with the stock 36T pulley. Also compatible with the street configuration Exway Atlas 2WD and 4WD in combination with the 44T pulley. 325-5m-15 Belts: Compatible with the street configuration Exway Atlas Pro 2WD and 4WD in combination with the 44T pulley. 340-5m-15 Belts: This is stock for the all terrain configuration Exway Atlas 2WD and 4WD. Use with the stock 56T pulley which is paired with the stock 6.3-inch all terrain tires. 360-5m-15 Belts: This is stock for the all terrain configuration Exway Atlas Pro 2WD and 4WD. Use with the stock 56T pulley which is paired with the stock 6.3-inch all terrain tires. 375-5m-15 Belts: Compatible with the all terrain configuration Exway Atlas 2WD and 4WD. Use with 66T all terrain pulleys. These are typically used with the 7-inch all terrain tires. 395-5m-15 Belts: Compatible with the all terrain configuration Exway Atlas Pro 2WD and 4WD. Use with 66T all terrain pulleys. These are typically used with the 7-inch all terrain tires. Our belts are made by one of the largest timing belt manufacterers in the world. The combination of the neoprene body and kevlar reinforcement provides the highest level of strength, durability, and longevity possible. In fact, our belts use the same kevlar webbing that is used in Top Fuel Dragster Supercharger belts! Not sure what this means? It means these belts are CRAZY strong. Ride the best. Ride HyperDrive.
