1968 Chevelle Factory Tire: F70x14
According to Coker Tire website , the F70-14 is 26.2″ tall
I’ve used a basic equivalency chart for years.
E70-14 >> 215-70R14
F70-14 >> 225-70R14
F60-15 >> 235-60R15
Notes: On the BFG site, the radial T/A 225/70-14 is 26.5″, a good sub for the F70, the 215/70-14 is 25.9″, a good sub for the E70. Other manufacturer’s sizes will vary slightly.
Direct Radial Replacement Sizes for factory F70x14
Front Tires: 215/70R14
Section Width: 8.46in
Rim Diameter: 14in
Overall Diameter: 25.85in
Sidewall Height: 5.92
Rear Tires: 225/70R14
Section Width: 8.85 in
Rim Diameter: 14in
Overall Diameter: 26.40 in
Sidewall Height: 6.20 in
Current Tires on 1968 Chevelle
Front Tires: 225/60R15
Section Width: 8.85in
Rim Diameter: 15in
Overall Diameter: 25.62in
Sidewall Height: 5.31
Rear Tires: 255/60R15
Section Width: 10.3in
Rim Diameter: 15in
Overall Diameter: 27.04in
Sidewall Height: 6.02 in
Speedometer Difference: 4.602% too slow
New Tires and 17″ Rims:
Front Tires: 215/50ZR17
Section Width: 8.46 in
Rim Diameter: 17in
Overall Diameter: 25.46 in
Sidewall Height: 4.23 in
OR
Front Tires: 235/45R17
Section Width: 9.25 in
Rim Diameter: 17in
Overall Diameter: 25.32 in
Sidewall Height: 4.16 in
Rear Tires: 245/45ZR17
Section Width: 9.64 in
Rim Diameter: 17in
Overall Diameter: 25.68 in
Sidewall Height: 4.34 in
Speedometer Difference: 3.061% too slow