[5spd540]

Originally Posted by JohnJ@RideTech

It equates to about a 4/6 drop. We currently have a 255/40R18 on the front and a 275/40R18 on the rear of the blue truck. They fit great with no rubbing and do not require a custom offset. I have also seen another 72 C10 with 20in wheels and they seemed to fit great as well but I (personally) prefer the 18 as it allows us to run a slightly taller tire which also improves ride quality. I will try and attach a picture of some trucks for you to see.
Both of the trucks in the pictures have 18in wheels and have the StreetGrip system.
Attachment 1654999

Attachment 1655000

Is this your truck?