A super thick Blockley inner tube, made from the best material (butyl) with an "on centre" positioned valve stem suitable for wheels with a central valve stem position, such as the Model T and Model A Ford. Most 20 and 21 inch wheels do not require an "on centre" valve stem, but when you do, this is the perfect tube, the likes of which are unavailable elsewhere.

This inner tube is unlike anything else available, a no compromise weighty product we produced to compliment our 440/450x21 Blockley tyre. Made for trouble free motoring, its butyl thick cross section means it will hold pressure for far longer than what people have been used to with their existing brand of tubes!