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The Mark II initially had a 21x4.50 tyre in its first year of manufacture, for which a 440/450-21 crossply would now be a suitable replacement. However, this was quickly superceded by a 525-18 tyre on a new 18 inch wheel for both the standard car, and the speedier Ulster version.
The last of the 1.5 litre cars were subtle upgrades of the previous Bertelli cars, and again were successful competition vcars, as well as being exclusive and sought-after road cars.
Avon Supreme 525/550-18 86N 
Ensign GS D2/103 525/550-18