Home WHAT'S IN A TRIALS CAR by Grant Campbell

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The Frame on my trials car(s) starts with a Type 3 VW sub-frame/torsion bar housing. The roll bar is regulation 12g 1 3/4" mild steel tube & the rest is 16g 5/8" mild steel tube. I use square section tube because it is easier to match up to the next bit without having to profile it. Everything is bronzed together so it looks neater, and if any cracks occur, it is easier to repair on site. Square tube is also just a bit easier to straighten.

On later cars I've used 3/4" tube as the 5/8" stuff probably bends just a bit too easily (but only when I lean on trees!).

View shows how much the frame is necked in here to clear the wheels. On later cars I've tapered this area from further back.