Bike Block Pro 1 is a Support arm which attaches to the bike frame securing it in the Carry-Bike. 
Suitable for all Carry-Bike models.
The head of the block has a large non-scratch base with an adjustable strap that fits round and oval bike frames with diameters from 25mm to 100mm.
Can be used on other bike racks with a tube diameter of 28mm to 35mm.