Originally Posted by Deep Blue

How heavy are these combos. Lokks good but I would hate to add anything that actually hurts performance.

Originally Posted by SPANKY LS1

Have you driven the car any with the new wheels and tires? Won't that cause problems with the ABS/TC system?

Aren't the VSS expecting the front and rear wheels to be turning at certain speed "ratios" in relation to one another (not so much the same, just at the same percentage ratio, front to rear).

For example, the stock tires are 25.7" (F) and 26.9" (R) diameter. The fronts rotate 808 revolutions per mile, the rears rotate 775 revolutions per mile. The rears rotate at a 96% rate when compared to the fronts.

Your new tires are 25.6" (F) and 28" (R) diameters. The fronts rotate 814 revolutions per mile, the rears rotate 744 revolutions per mile. The rears rotate at a 91% rate when compared to the fronts.

For every mile that you drive and the VSS relies on data to determine weather Active Handling/Traction Control/ABS is necessary at any given time, your tires are rotating much differently than the ECM thinks is "normal". Is there enough "flexibility" so that the ECM figures out what is going on without causing problems?

Shawn

Originally Posted by SPANKY LS1

Acccording to John @ CCW, the 20x11s should weigh nearly the same as the stock 19x10 painted wheels.

Originally Posted by shopdog

But the center of mass is located further from the axis. That means inertia loading is greater. In other words, it takes more power to accelerate, and more braking effort to decelerate the 20. That's why F1 and Champ cars use 12 or 13 inch wheels with 40 or 50 profile tires, and why fuel dragsters use 15 inch wheels with 50 or 60 profile tires.

Tires with extremely short sidewalls on huge spoked wheels were popular on antique farm wagons and stage coaches, but they aren't a good choice on a performance car.

Originally Posted by SPANKY LS1

While this might be an issue when going from a 19" wheel to a wagon wheel, I doubt that going from a 24 lb 19" rim to a 24 lb 20" rim is going to make much of a difference, if any at all.

Shawn

Originally Posted by shopdog

But the center of mass is located further from the axis. That means inertia loading is greater. In other words, it takes more power to accelerate, and more braking effort to decelerate the 20. That's why F1 and Champ cars use 12 or 13 inch wheels with 40 or 50 profile tires, and why fuel dragsters use 15 inch wheels with 50 or 60 profile tires.

Tires with extremely short sidewalls on huge spoked wheels were popular on antique farm wagons and stage coaches, but they aren't a good choice on a performance car.