Love this subject! LOL
The largest practical diameter rotor you can run in a typical 15” Halibrand/Trigo wheel is
12.720 x 1.25 thick but there are a lot of variables. The inside contour of the wheel and caliper profile dictate the location. Caliper with opposed pistons (Wilwood, Brembo etc) require a lot more push-back that a sliding caliper (GM or PBR types) Try not to get “Diameter Envy”. These cars are light and the typical use (even on the race track) just don’t generate the heat load that would require large rotor (over 12.5)
It should be noted that a a 12.19 x.810 rotor weighs about 9.5lbs
my 12.720 x 1.25 weighs 13.4 and a 14.25x1.25 comes in at a whopping 18.7lbs each! You will feel the difference in rotating mass just like going to an aluminum flywheel.
IMO, 12.19 x 1.0 or 1.25 with a Superlite size caliper (4 or 6 piston) is the best fit for 99.5% of the group with a few exceptions.
JASON
