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Good question! All I can say is that during the last 3 years/20Kmiles of running 43" super singles on 20x11 wheels (10.5"backspace), I never had even a sign of premature wheel bearing failure. OK, most was driven on paved roads and not more than half of the payload. Gerhard

Not a bad idea if it would pay for the effort…Would be some kind of a hardened sleeve only 2.4mm thick with a step, press fitted from the outside into the brg…. hmmmm. I had something similar in mind, to replace the weak 392/3920 center pivot bearings for the rear suspension. :roll:

That is my point, too! Lee, I concur with everything you said, specially that “ real world” conditions are far from ideal regarding equal load distribution on bearings. Let me just correct one detail: inner and outer races (cup) in our hubs are the same (3920), bearings (cone) are not. Inner...

OK, thanks a lot. 9 7/16” is very close to 9 ½”, so this would confirm that backspace of M135 wheels is almost the same, if not identical to M34 wheels. This also means that equipped with these wheels the std. M35 (front-) track width is increased by just two inches. Hard to believe that this...

Thanks Tony, you are right. I have to admit it: I have been using the terms backspace and offset like everybody else in our country, as if they where synonyms and just confirmed they are not! :o Offset = Backspace - (Rim Width ÷ 2) According to your specs, backspace of an M135 wheel would be...

The drawing below shows the relative position of an M34/M135 single wheel/tire on a reversed hub vs. the M35 duals. It's exactly centered to the duals. I would say that strain on bearings due to twice the weight and extra leverage while running over obstacles is actually worse with duals! And...

Tony, Matt and others: just to make sure we're speaking the same language and not confusing anything, this is a std. M35 wheel, (cut), showing the real (exact) dimensions in proportion and how the offset is measured. I know, we are a little off topic now, but since everybody now is talking...

Still very strange... Wish I had acces to that publication. Next time you are around your truck with a measure tape in your pocket, could you please....... :roll: TIA

I’m wondering about those 5 ½” offset. :?: It should be more like 9 ½”…. How did you measure? Gerhard