The SS-II used 205/50R16 and the SS-III used 215/50R16 factory fitment (or equiv rolling diameter)
So whichever car your gearbox speed sender came from (either the SS-II beams clip from the original swap or the SS-III LSD transmission swap) your speedo will be over-reading what you're actually doing either a little bit or alot. If you are using the speedo sender from the original USDM car and are running the same rolling diameter then it will be closer to accurate.
However with your current tyre size I have a feeling you will be going about ~3mph slower than reported per 60mph.
So whichever car your gearbox speed sender came from (either the SS-II beams clip from the original swap or the SS-III LSD transmission swap) your speedo will be over-reading what you're actually doing either a little bit or alot. If you are using the speedo sender from the original USDM car and are running the same rolling diameter then it will be closer to accurate.
However with your current tyre size I have a feeling you will be going about ~3mph slower than reported per 60mph.
Mike W1996 Toyota Celica ST205 GT-FOURGT2860RS turbine, TiAL mvr44, JE 86.5φ piston, Clutchmasters FX400, APEX P-FC269awhp / 273ft-lbs








