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Goodyear switched from Speedway Wide Treads to Polyglas red stripes approximately April of '69.

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Not quite ..... The Polyglas was available (OPTIONAL) all year 383/440 (it was STANDARD on HEMI cars - F70X15 in size).

The STANDARD performance F70X14 "red stripe" across the board was a nylon cord tire (Super Bee, Road Runner, Charger R/T, GTX, Coronet R/T) for most cars this was the Goodyear "SPEEDWAY" sales code was T83. (This is the tire that lasted less than 20K miles & people about.)

OPTIONAL at NO-CHARGE was a performance F70X14 "white stripe" this was also a nylon cord tire (Super Bee, Road Runner, Charger R/T, GTX, Coronet R/T) for most cars this was the Goodyear "SPEEDWAY" sales code was T82. (This is another tire that lasted less than 20K miles & people about.)

OPTIONAL at $26.45 was a performance F70X14 "red stripe" this was the new to MOPAR fiberglass belted tire (Super Bee, Road Runner, Charger R/T, GTX, Coronet R/T) for ALL cars this was the Goodyear "POLYGLAS" sales code was T85. (Huge improvement in ride, grip, longevity. )

Firestone WIDE OVAL DELUXE CHAMPION nylon cord "red stripe" T83 & "white stripe" T82 tires have been found to be original on Hamtramck, MI assembled '69 Chargers. Charger is the only b-body assembled at Hamtramck in 1969.

* Reproduction "SPEEDWAY" tires are built fiberglass-belted just like the "POLYGLAS" tires ..... so no !!