This is by far the best 30x3 1/2 (30x3.5) inner tube available anywhere, which is why we have made these "Blockley Superior" quality tubes. Far thicker and heavy duty and made fom the best material butyl. This 30x 3.5 tube is fitted with a metal nickel plated stem. This inner tube fits our 30x3 and 30x3 1/2 tyre, and has correct dimensions which are quite different to other tubes available. And unlike what you are used to, they will not be needing constant pumping up!

With the thicker walls, and being made from the best material butyl, our 30x 3 1/2 inner tubes will ensure these do not lose pressure like the other tubes available - which is important because beaded edge / clincher tyres require higher pressure, because running on lower pressure leads to problems and tyre damage. And tubes that leak will lead to lower pressure which will lead to problems and failures. All valve stems we have seen from the period are metal, and nickel plated, which is why the Blockley tube valve stems are also nickel plated.  Rubber valve stems did not exist until decades later.

This 30x3.5 tube (suitable for our 30x3 tyre also) are unlike customers have never seen before. Yet these superior 30x3 1/2 Blockley tubes cost much less than a branded Michelin tube, which is only possible because we sell them direct to the end user / garages / restoration shops and not through the Classic tyre wholesalers. When you see these Blockley 30x3 1/2 inner tubes you will understand why you should be using them, and why we needed to make them in the first place, to accompany our 30x3 and 30x3 1/2 Blockley tyres!