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Well, I didn't say that fast...:smile: BTW, a Multifuel crankshaft @ 2800 rpm has a similar linear (tangential) speed, where the seal goes!

The "shaft diameter" - or sleeve in our case, where the seal rides on - is said to be 3.25 inches (to be confirmed), so the circumference there is 0.85 ft. That means that the hub (with its seal in place) is allowed to spin up to 4,235 rpm. Which is equivalent to towing that trailer at "only" a...

8-sided, 3-3/8". G.

Thanks for the good info. Just to confirm what I said in post #4: for the M105A2 and A2C models the inner and outer cone is #39590; inner and outer cup is #39520 (NSN 3110-00-198-1757 refers to one complete cone/cup bearing set) Not so surprising really, if you think that the outer end of...

Oops, sorry about that... should have typed mm, not ". Yes, divided by 25.4 gives your numbers.

M105 & M105A1 are the same size and diameters (same bearings) as the Deuce axles: Ø 66.675" inner, Ø 61.912" on the outer end. M105A2 & A2C have Ø 66.675" on both ends, inner and outer side. (I'm almost certain that the bearing numbers are 39590/39520) G.