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I've got one of Mike's bars. The softer of the two that he offers, the 0.188" wall thickness bar, not the 0.25" bar.

Here's the specs on it so you can do the math:

Outer diameter 31.75mm
Wall...

My applications are a little different, a slightly modified Miata autocrosser and a Honda sportbike motored Lotus 7. I don't see as much heat soak, but see more runs up the rev range with a very...