An interesting tire/wheel "comparison/calculator"

[WVZR-1]

This "comparison/calculator" is more interesting than most. If you enter your present tire it will "offer up" some appropriate + sizes. You can also of course enter your own second choice. If you know the weight of your wheel and tire you can enter it, enter the second weights and it will actually calculate sprung weight differences.
It doesn't take very much effort to become quite familiar with it. Accuracy? Seems appropriate, it can only calculate your entries. It is what "you feed it"!! If you enter no weights it fills with 20 lb. It also has a calculator for torque to 60 MPH using car weight and max torque which you supply.

The speedometer information/error of course is based on advertised dimensions and not installed "real" dimensions.

The options/tools seem to be adjustable and you can create the tolerance/variance for the recommended + sizes. It's NOT fixed. Quite versatile it seems.

http://www.tirewheelguide.com/


Something that would make this tool "very useful" would be to compile the actual weight of each of the OE/GM wheel options for our cars. The '90 "salad-shooter", the '91 - -92 "painted saw-blade", '93 - "machined saw-blade", and of course the '94 - '95 "A-mold". I've got '90's and A-molds but not an appropriate scale. The weight needs to be done on an appropriate scale not bathroom" variety. Then you just use the advertised weights of the tire.