I have a rally scooter, I need a 2.80/2.50-4 sawtooth pneumatic, it says on your add that it is 9 inch by 3, I measured the tire on this scooter but measures 8.5 by 3.5 inches and rim is also 3.5 inches.
The 2.80/2.50-4 is the metric measurement or dimension of the tire, which is roughly 9"x3". We round up since metric measurements are different from what we refer to as 'standard'. This would be the correct replacement tire for the Pride Rally scooter.