M03 tires

Bought 3 different pairs of tires for M03....

From left to right, Tamiya M-chassis Super Slicks; Tamiya M-chassis Slicks; Xpress M-chassis radial.

But all looks smaller than the original tires????

Your 'original' tires probably is 60D tires which has a aspect ratio of 60, thus 'thicker' then
these show here.

Tamiya original issue tires like these at the time of M01/M02. But these few years they
start issuing those 60D tires for some model and you probably purchase one of those.