475/500 x 20

475x20, 500x20

A 4.75/500 x 20 cross(bias) ply tyre of incredible quality, with a period correct triple stud pattern, offering a superb handling and ride experience unlike anything else available.

Type Crossply
Rim diameter 20"
Tread width 4.25" (108 mm)
Overall width 5.51" (140 mm)
Overall diameter 30.50" (775 mm)
Rim width (min) 2.75"
Rim width (max) 3.75"
Rim width (recommended) 3.25"

(£190.80 inc. vat)


We were persuaded to make this size by a number of Alvis owners who wanted a well handling, high quality built tyre, unlike everything else available to them! This is also a useful size for a number of other marques such as Austin 12 etc. Twenty inch tyres are a neglected size, probably due to low demand for the 20" sizes in particular, and what is available for the vintage car world has been of particularly lowly quality.  Feedback from owners using our 20" tyre has been terrific. This typifies the Blockley Tyre Co. Ltd's ethos to supply the best product in the rarer sizes that have experienced limited production for a long period, yet in an unrivalled quality, and at an affordable price because we sell direct without the services of a Wholesaler Classic tyre outfits in between. 

All Blockley Cross (Bias)ply  tyres are made to fit the original rim widths, something other manufacturers have forgotten about over time. In addition they are genuine tyres for road use, with a robust sidewall and covering, capable of being 'curbed' as you would expect from a tyre suitable for road use. The Dunlop triple stud pattern in period was a problematic one, which resulted in it being superseded. We liked the period look of the triple stud tyre, so we re-designed all features of this pattern to make it work correctly without wearing out in no time. The compounding of all our cross (Bias) ply tyres conform to FIA Appendix K which uses Dunlop 204 compound as its reference hardness. This same Blockley tyre, surprisingly, has no equal having won many thousands of races and other competitions as well as Concours d'Elegance events, including class wins and overall best of show at Pebble Beach!.

This is why we coined the term Road Race for tyres when we started. Which has been copied (as have many of our tyres) by the classic tyre wholesalers who we do not sell through. So beware of imitations!

All Blockley tyres are made with new moulds and tooling with a high level of quality control, resulting in a product of unsurpassed quality, roundness and conformity. We also make a high quality inner tube for this tyre, which we would recommend.

People who bought this also found the following products useful

20/21 inch Rim Band (40mm wide)

Blockley Rim Band

£3.50 (£4.20 inc. VAT)

450/525x20/21 Inner Tube with off set valve stem

Blockley Inner Tube

£30.00 (£36.00 inc. VAT)

450/525x20/21 Race Valved Inner Tube (offset stem)

Blockley Race Valved Inner Tube

£37.00 (£44.40 inc. VAT)