Hi Reme and Retalator, thanks for your replies guys.
I am looking for 11 of these tyres to potentially fit a M35 Reo, with the purpose of increasing the rolling circumference of the wheels/tyres (Over the standard 9.00 20`s) and thereby increasing the gearing - achieving another 4-5 mph at the same RPM`s in 5th gear, high range.
I`m not too fussed if they are track grip or Bar grip (assuming the patterns are similar?) as long as they look roughly period correct. My main goal is that they will fit/seat correctly onto an American 20" split rim and that the diameter of the tyre is around 105/106cm approx.
Reme - do you know the diameter of the 10.50 20`s?
Retalator - thanks for the offer, appreciated, but I will be needing 10 of these tyres as a minimum, preferably 11.