11/28/2025
I sell car/truck parts for a living and I like to build a vehicle to learn as much as possible. That’s why I’m building this 98 Chevy on a No Limit autocross chassis. I’m designing parts on it and testing wheel widths and backspacings. I ordered my Forgline wheels while my chassis was being built and I set the rear track width to be the same as a 67-72 C10. (75”) I figured since thousands of people put OBS beds on C 10’s and the body panels match up, that the track which would be the same. This didn’t work out how I thought it would and my tires barely clear the inside of my bedsides. For my customers that have 1963-87 Chevy/GMC trucks, I set them up with a 56” Speedway fab 9 rear end and 12” wide wheels with a 3.5” backspacing. This gives an overall track width of 75”, which which is nice and wide for handling purposes, but clears the bed sides even when laying frame. No Limit recommends a track width of 73” front and rear, so a 12” wide wheel would need a 4.5” bs with a 56” rear end. The stock OBS rear end is 64”. Anytime I talk about bs (backspacing) I’m always going for maximum lip. Most autocross guys are running a wider rear end and more bs. My front wheels are 19x11 w/ a 7” bs and my rear wheels are 19x12 w/ a 3.5”bs. I nailed the 73” in the front, so these are measurements I will keep using. Front tires are 305/30/19 and the rear tires are 335/30/19. They measure 13” wide and require a 2” wider wheel tub. My wheels are Forgeline GF3-Open lug with a transparent gold over brushed aluminum. The last picture is my 67 C10 with a 75” rear track width running a Speedway 56” rear end, 12” wide Billet Specialties, w/ a 3.5” bs.
