We have the following sizes and offsets:
12x8 3+5 (For straight axle vehicles and only in the Revolver and Octane model)
The weights vary depending on the style you choose (ie: positive, tracer, none).
12x6 average 11 lbs
12x8 average 12.5 lbs
14x6 average 13 lbs
14x8 average 15 lbs