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Good morning all, I have 2 questions; I have been using my M quite a bit since the engine rebuild. Its 100% stock Wondering, whats the engine turning when I'm doing about 40-45MPH, I dont usually go over 45. Second; whats the PSI for the 16" NDT tires?? Thanks BOB

At 45 mph, your engine will be turning somewhere in the neighborhood of 2,000 RPM.
Tire pressure should not exceed 40 PSI.

Bob,

My calculations (http://m37.wawii.com/images/MyM37SpeedChart.gif) show that the 5.83 gears would put you at about 2600 RPM for 45 MPH.

And those figures will work only if the speedo is accurate.