525/600 x 21

A 5.25/6.00 x 21 cross(bias) ply tyre with a period looking triple stud pattern.

Type Crossply
Rim diameter 21"
Tread width 4.69"
Overall width 5.91"
Overall diameter 33.00"
Rim width (min) 3.25"
Rim width (max) 4"
Rim width (recommended) 3.75"

(£288.00 inc. vat)


A dual marked 525/600 x 21 which is the same specification as a 600 x 21.  We dual marked this tyre although we dislike doing so, because Michelin were producing a 500/600 x 21 at the time and many other brands were dual marked 550/600 x 21 all of which is for modern day marketing purposes.

This is a fantastic tyre in every respect, one customer noting that he received 30% more fuel economy by switching to this Blockley Tyre on his 6 1/2 litre Bentley.  The first set used by Dr. Tim Houlding on his 3 - 4 1/2 Bentley gave nearly 4 times the road miles compared to his previous Michelin sets! This genuine road tyre is often seen winning both circuit races and pre-war trials classes, as well as having been on a Best of Show at Pebble Beach winner : a great all rounder which works as well as it looks. 

Prior to this 600x21 Blockley tyre, there was nothing "decent" available in 21", so most cars like Bentleys would have been converted to 18 and 19 inch wheels. After we made this tyre it took a while for people to get used to the "authentic" look of the cars they were fitted to, but today it is the norm.

All Blockley Cross (Bias)ply  tyres are made to fit the original rim widths, something other manufacturers have forgotten about over time. It is important to appreciate these 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. 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 and a high level of quality control, resulting in a product of unsurpassed quality, roundness and conformity.

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