The MGC was fitted with 165-15 radial tyres throughout production. The original 1967 to 1968 fitment was the Dunlop SP41, replaced by the SP68 on 1969 models. Both were radial construction, the MGC was never delivered on crossply tyres, reflecting its character as a fast touring car rather than a traditional sports car. Modern 165HR15 radials provide the correct size and speed rating for the 15-inch 5J rims.
The 'HR' speed rating denotes a sustained speed capability of 130 mph, appropriate for the MGC's maximum speed of approximately 120 mph for the Roadster and slightly higher for the GT.
Tyre Selection
Several modern tyre brands produce 165HR15 sizes suitable for the MGC, and the choice should be guided by the owner's typical driving. Touring-oriented tyres provide a comfortable ride and good wet-weather grip for regular road use. Performance-oriented tyres offer improved dry grip and sharper turn-in response for spirited driving. Period-style tyres with a classic tread pattern provide an authentic appearance for show and concours use while still meeting modern safety and performance standards.
Whatever tyre is chosen, all four tyres should be the same brand, pattern, and specification, mixing tyre types on the same car causes inconsistent handling that can be unpredictable at the limit.
Replacement Considerations
When replacing tyres, it is important to fit the correct 15-inch size, 14-inch tyres intended for the MGB will not fit the MGC's larger wheels. Tyres should be replaced as a pair on each axle as a minimum, and ideally as a complete set of four, to maintain consistent handling and grip characteristics. The MGC's front-heavy weight distribution, approximately 55% of the car's weight sits over the front axle, and its relatively high top speed for the era make tyre condition particularly important for safe handling. Tyre pressures should be set to the manufacturer's recommendations, typically around 24 psi front and 26 psi rear for normal road use, adjusted for load and sustained high-speed driving.
Under-inflated tyres cause excessive sidewall flexing, accelerated shoulder wear, and imprecise steering response, while over-inflation reduces the contact patch and causes harsh ride quality and centre-strip wear.