Description The Tubus Clamp Set will allow you to mount your rear rack to your seat stays if you do not have eyelets. Meaning that you can have a rear rack even if you don’t have mounting points for it! Be sure to confirm the diameter of the tubing of your seat stay before choosing your clamp set. Despite the photos the clamp will come pre-bent to suit the specific tubing diameter stated. See installation instructions for the Tubus Clamp Set here. Seat stay tubing size Tubus Part no. Weight 16 mm diameter 71616 42 g 18-19 mm diameter 71618 42 g 21-22 mm diameter 71621 44 g Unsure if your bike has the eyelets or mounting points for a rack and whether you need this clamp set? We can help! Get in touch with us with the details of your bike or some photos and we can tell you if you need clamps. You can also bring your bike down to our Bicycle Repair Shop as we fit Tubus racks to bikes in the shop, usually while you wait.