Classic Series The EziGrip Classic Series of bike racks is now only available in only 2 & 3 bike models as below. These straight and 60mm offset bike racks will fit onto either a 1 7/8" or 50mm towballs. EziGrip Classic Series Bike Racks 2 Bike Straight Riser Part # - 7900C Fits most vehicles without rear mounted spare wheels. Boot access may be restricted on sedans and hatches. 3 Bike Straight Riser Part # - 7906C Fits most vehicles without rear mounted spare wheels. Boot access may be restricted on sedans and hatches 2 Bike 60mm Offset Riser Part # - 7957C Fits vehicles with small rear mounted spare wheels. Allows boot opening for most sedans & hatches. 3 Bike 60mm Offset Riser Part # - 7958C Fits vehicles with small rear mounted spare wheels. Allows boot opening for most sedans & hatches.