Tony
1955 Bel Air Sport Coupe
Using plywood could work assuming they are perfectly flat, but the sidewalls of most tires are not all that flat, and could skew the readings quite a bit, unless you made standoffs to touch the wheel flange instead. They use commercially made toe plates at the track for quick adjustments though. Trammel bar is a more accurate method. When using a trammel bar rather than trying to scribe a line on the tire I found it easier to just make a vertical line on a piece of masking tape on center of the tires, and roll the car back and forth using the same 2 reference points. Very accurate, and pretty easy to do.
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Last edited by 55 Rescue Dog; 01-12-2018 at 05:25 AM.
I have heard of using a cheap extendable curtain rod, set it to front or back and then compare. I like the tape idea and roll. Last time I did mine I raised the wheels off of the ground, spun them and marked a ring on the tread with soap stone. The tape sounds easier and better; get the same point for sure.
56-210, 283, 200-4R, Power steering, Power Brakes
Although I also see a tire scribe in that ad, I don't quite get the need to make a true line, however I did just get the idea of measuring to one of the lines in the tread? If I raised the wheels and spun them I could see if the tread is straight/true. I could be a bit confused since I had a minor procedure done at the hospital and was under general anesthesia this morning.
Tony
1955 Bel Air Sport Coupe