A good thickness robust Blockley butyl inner tube sized 450/525x20/21 made from our own Blockley tooling, so we can supply a wholesome uncompromised superior quality tube to fit the tyres that we produce. Nothing you can buy is anything like this good.

This Blockley tube has a good thick sidewall like in period, and made from the best tube material butyl, and has the rubber valve stem offset to fit a normal well base wheel rim. There is no better tube made, or available, than this Blockley tube.  We made this tube only because we needed a perfect quality tube to supply with the Blockley tyres we produce. Dont forget to use rim bands too . . .

Note Blockley also have this tube available with a metal nickel plated stem.

For those wanting an "on centre" valve stem position, Blockley also supplies these tubes - popular on some Ford cars.