Today on our 2010 Scion XB, well be test fitting the Thule Vertex four bike carriers for an inch and a quarter and two inch hitches, part number th9029. A quick note on this bike rack it will work on both inch and a quarter and two inch hitches, however, when using with a class I hitch you are limited to two bikes. Now weve gone ahead and removed the two inch adapter sleeve from the bike rack… see more >