A super thick Blockley inner tube, size 450/525x20/21 made from the best material (butyl) with an "on centre" positioned valve stem suitable for wheels that have a central valve stem position, such as the Model T and Model A Ford. Most 20 and 21 inch wheels do not require the "on centre" position valve stem, but when you do, this is the perfect tube, in a quality the likes of which you will never have come across before, and certainly unlike anything available elsewhere!

This inner tube is unlike anything else available, a no compromise weighty product we produced to compliment our 440/450x21 Blockley tyre but suitable for larger tyre sizes in 20 and 21". Made for trouble free motoring, made from butyl thick and thick cross section means it will hold pressure, and unlike what people have got used to with their existing brand of tubes! And these Blockley tubes dont cost any more than the alternatives!