Wheel Offset
Wheel offset describes the distance that the hub mounting face of a wheel is offset from the wheel’s centerline. A positive offset is when the mounting face is outside of the wheel centerline. Negative offset is the opposite, with the mounting face inside of the wheel centerline. See example of a positive offset wheel below:

Speed Rating Identification
The speed rating of a tire is the maximum speed that it is safely capable of sustaining for extended periods. This is denoted by a letter code, which will appear on the tire sidewall in one of three ways:

205/60 HR–14
205/60 HR–14 89H
205/60 R–14 89H

The rating code is as follows:

Q =100 MPH       H = 130 MPH
S = 112 MPH      V = 149 MPH
T = 118 MPH      Z = 149+ MPH
U = 124 MPH

“R” refers to radial construction. “89” is a load rating index.

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