Thule VeloCompact 927 4th Bike Adapter. Free delivery to most of the UK.
Thule VeloSpace XT 4th Bike Adapter
Increase the capacity of your Thule VeloSpace XT carrier by one bike. Fits only on the Thule VeloSpace XT 3 bike carriers (938 & 939)
Note: Max bike weight for this adapter is 15kg