SC Speedo for 15" Wheels

[Superman]

I know that 15" wheels were an option for SCs. Did these cars use a different speedo than SCs with 16" wheels? I guess I am asking whether stock 15" wheels and tires had a different tire diameter than stock 16" wheels and tires.

[Bill Verburg]

Originally Posted by Superman

I know that 15" wheels were an option for SCs. Did these cars use a different speedo than SCs with 16" wheels? I guess I am asking whether stock 15" wheels and tires had a different tire diameter than stock 16" wheels and tires.

No, but they probably should have

225/50 x16 is ~24.8"(838rev/mi) the alternate rear was a 215/60x15 @~24.2"(820 rev/mi), delta ~2.2%
The only year they had a different speedo was '76 where either a 215/60 x15 or 225/50 x15 @23.6"(872rev/mi) was used. delta ~6.3%