Originally Posted by
oggietiu
Larger rear tires? That's something I have never come across in off road. SO it means as your rear tires gets eaten by the asphalt your car becomes slower.
Yes, as your tires get smaller you will have more torque but less top end because it changes your final drive ratio. A lot is determined by your clutch setting as well as far as the torque goes that is.
I usually start my tires at 72mm to 74mm for quals. I will start them at 76mm for a long main. There is a noticeable speed difference between say a 76mm tire and a 69mm or 70mm tire. Changing tire diameters to get top speed is not where I would go to get that. I would only use gearing. Changing the tire diameter will change the handle of the car.