The new Transfer v2 models can each be expanded to carry an additional bike with the 1-Bike Add-On. Increase the capacity of your 1-Bike, 2-Bike, or 3-Bike rack to carry up to 4 bikes* with all the features you expect at a price that's unexpected. *Add-Ons cannot be stacked. Only a single 1-Bike Add-On can be attached to Transfer v2 models. The 1.25"-2" Transfer v2 2-bike (SKU T202B) model cannot take a one-bike add-on. - Automotive-grade 750 hour salt spray hardware - Holds up to a 50" wheelbase bike (previously 47") - Holds wheels 18"-29" (previously 20"-29") - Holds tires up to 5" with accessory strap (previously 4.5") + better hook clearance for loading fat bikes