The Roma is assembled & designed in lightweight aluminium to aid fitment, the quick release lever clamp can be adjusted to suit 25-90mm oval or round frame tubes. The adjustable wheel channels with hold downs make for a secure fitment.Key Features:Anodised aluminium bike carrier - Lightweight but very strong,Use on roof bars up to 70 mm wide,Fits round downtubes from 7 to 70mm,Fits oval downtubes 70 to 90mm,TUV tested and approved,Strong, lockable clamp,Wheel positioners fully adjustable,100% Manufactured in Italy..