Re: The leverage is only slightly worse than on only inner


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Posted by Ken Dunnington on Thursday, August 24, 2006 at 4:12PM :

In Reply to: The leverage is only slightly worse than on only inner posted by chriscase on Tuesday, August 22, 2006 at 7:40PM :

The 'load center' (from which a moment would be calculated) is at the center of the rim, halfway between the two tire beads(how a partially flexible pneumatic torus transfers forces is not generally intuitive but the end result is). Thus the load center for just the inner tire(the OEM setup in this case) is substantially different than the one for just the outer tire of a dual setup. Most of the time(even road surface) the load is being distributed fairly equally across the two tires whereby the load center is between the two wheels. But the expected(designed for) load center is the one from the inner only, which in this case is well inboard of the wheel mounting surface. So even with the load equally distributed across the duals, the load center is outboard of the designed for location, like 4"-5" outboard in the PW case. Then in the case of the outer tire taking the full load in uneven terrain, the load center would be double that distance away from stock(actually more than double because the rim center for the pictured wheels is offset from the mounting surface more than the stock wheels). So a dualled PW setup could exert a load onto the hub with a center 10" outboard of the designer’s expected location of that load. Thus a different moment experienced by the hub, the bearings, the spindle, the spindle mounting bolts, etc...

Ken




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