The Harris type tube (as sold on the A&R race van and such places for £11 ea) does not fit the clamps that come with the clip-ons from Extreme BykeSportz (Robby Moto) as they stepdown in size to enter the clamping area.
I get my tubes for my Harris clip-ons made by a mate and he has recently made some for Senna3 for his Robby Moto bars, Not sure if my mate will be able to make them next year as he did them on the side and he changes jobs in the new year when he comes to work for me
