The Fulcrum Racing 4 wheels have a great design and the internal rim width of 17 mm makes these wheels suitable for wider tires from 25 mm. The Fulcrum Racing Quattro wheel set has been one of the most reliable wheels on the market for many years. The 35 mm half-high rims and shorter straight pull spokes makes this wheel set stiffer compared to a wheel set with lower rims. This will ensure a lower chance of spoke breakage or blows in the wheels. The hubs are also equipped with maintenance-free industrial bearings which last a long time until they have to be completely replaced for an affordable amount. All this ensures that the Fulcrum Racing 4 is a very popular wheel set! Industrial Bearings These wheels are equipped with industrial bearings. The advantage is that they require virtually no maintenance, but when they are worn out, the entire bearing must be replaced. There is more friction when driving in different angles compared to a cup-cone bearing. Over time this may cause play and this cannot be adjusted.