Comparison is
Stock Tire - 245/70R16 vs - 245/75R16
Section Width: 9.64 in 245 mm
Section Width: 9.64 in 245 mm
Rim Diameter: 16 in 406.4 mm
Rim Diameter: 16 in 406.4 mm
Rim Width Range: 6.5 - 8 in
Rim Width Range: 6.5 - 7.5 in
Overall Diameter: 29.50 in 749.3 mm
Overall Diameter: 30.46 in 773.68 mm
Sidewall Height: 6.75 in 171.45 mm
Sidewall Height: 7.23 in 183.64 mm
Radius: 14.75 in 374.65 mm
Radius: 15.23 in 386.84 mm
Circumference: 92.67 in 2353.8 mm
Circumference: 95.69 in 2430.5 mm
Revs per Mile: 705.0
Revs per Mile: 682.8
Actual Speed: 60 mph 100 km/h
Speedometer1: 58.1 mph 96.8 km
So in short the 75 profile stands a 1/2" higher.
If you want it you can Paypal me £45 and I'll get it sent - PM me your details.
Cheers