pic: Wheel problem.

[Teched3]

Just to add my 2 cents to the wheel problem, based on my experience with the A/M wheels. Although your picture is not clear, it appears the bearing broke through the hub mount. Last year's wheel had a modification in this area by increasing the length of the webs at this bearing/hub mount, but they still did not fully come up to the outer edge of the bearing race. We felt this was still a weak area, and reinforced this by design. Initially, the first year, we filled the cavity at the hub/webs with a fiberglass resin mix, but still felt it was a weak area. Last year, we did not mount the bearings in the wheel at all. Instead, we bored our sprockets to accept a flanged bearing and made a washer of aluminum on the opposite side of the wheel and did the same. We only used three 10-32 screws though the A/M wheels for lightness, drilling clearance holes through the washer and wheel hub for the 10-32 bolts, and tapped the sprockets and jamb-nutted the bolts (to the sprocket) so they wouldn't loosen. We had zero problems with the A/M wheels last year, and the lateral load on the wheels in Overdrive would appear to be significantly higher than we would expect to see this year. A clearer photo would be helpful showing both sides of the wheel, and I hope this gives you some additional insight as to what may have caused this failure. By the way, we used flanged 7/8" OD x 5/16" or 3/8" ID shielded bearings instead of the 1.125" OD bearings as well. Finally, be cautious on how much you tighten the sprocket bolts, as overtightening is possible and can cause stress cracks to form that are very difficult to see.