We had an excellent post conversation about successes on an untrussed D44 awhile back. Consensus was anything over a 35 was not recommended. Another finding was many were commenting with little to no first hand experience.
Since I have a light 35 (MTR) on a gusseted d44with the minimum 4.5 backspacing, I'll refrain from giving advice.
I have heard that the 37 generally is too much outside traditional road use for the d30. A 37 owner will chime in soon enough.
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Ton of shit, and not listing it all..