A thick dimensionally accurate inner tube made from butyl with a metal 8mm diameter valve stem, a dedicated inner tube made for the 400x19 tyre size only. These 400x19 Blockley inner tubes are the best available anywhere in the world. For smaller and larger sized tyres we make a seperate dedicated tube for those also.

This valve stem (TR6) is used on cars such as some Austins, smaller MG's (such as P type etc). The TR6 / TR4 stem is  the valve stem in use on most vintage motorcycles also. If your wheel rims have the larger 11.5mm hole we also make this inner tube with valve stems suitable for these in rubber "TR13" and metal "TR11" types.

Usually older car and motorcycle wheel rims that use a 400x19 tyre have the smaller 8mm valve stem hole. The Blockley range of inner tubes are the best, which are sized correctly, thicker in section and made from the best material butyl - which is why we make them. This tube is not made for a 350x19 tyre (which has it's own dedicated tube) or a 450x19 (which again has its own dedicated tube) and so on - whereas you'll find that with many other brands the tubes are marked 400/450, or 350/400 and so on.

Because Blockley sell direct and not via the Classic tyre wholesalers, it means the best tyres and tubes in the world cost no more than the alternatives, as we do not have to build in their margins. There is no reason for not fitting a Blockley Superior Tube is anything. Don't forget to fit good quality rim bands also, which protect the tube from any spoke heads in the wheel well, which we also supply.