Not Ranked
I can accept your line of thinking for the construction method----however, being an racer and pilot, I like to leave excess weight behind.
A smaller tube ( like 1 3/4 ) inside some .125 wall 2 od tube would be no more likely to rust than the turned down 1/4 wall stuff. Why would it leak???? And also stress break at machined corner would be highly likely
This is a high performanc application and weight is weight----acceration and braking
But, I do admire the fact that you guys have made this thread and enjoy reading it--
If you do want 1 5/8 .083 I have quite a bit of it in stock
Jerry
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