Application CR Thickness CC depth CC volume GT6 Mk I 9.50 GT6+ 9.25 3.450 0.425 34 GT6 Mk III 9.25 3.32 .47 37 (early) GT6 Mk III 8.0 3.40 .55 44 (late) TR250, TR6 8.5 3.55 .60 48.5 TR6 middle 7.75 3.54 .68 55 TR6 late 7.5 3.55 .70 57 TR6 race 1 10.25 3.375 .52 41.6 TR6 race 2 12.3 3.295 .44 33 GT6 race 1 10.75 3.31 .385 30 GT6 race 2 12.75 3.22 .300 24.4