Blockley do not manufacture an 810x90 tyre, but we do make the 815x105 tyre which fits the rims. In a period brochure we even see 815x105 recommended as a size that can be used as a replacement to the 810x90. You can fit a Blockley quality tyre (size 815x105) to your 810x90 wheel rims.

The wheel rim diameter of a 810x90 and 815x105 is virtually identical. 614.3mm compared to 612.4mm, which on circumference is 6mm (1,930mm compared to 1,924mm). We will wager that there are cars with fitted with 815x105 tyres which have 810x90 rims, so check what wheel rims you have on your car! Also by fitting a superb quality 815x105 tyre, which is very similar diameter, the saving on a set of 4 tyres compared to the Excelsior 810x90 brand is near enough £660 including vat, or on 5 tyres £830.