[SuperMacGuy]

I was at Summit Point yesterday for FATT. During my 2nd heat I had my left front hub fail. It let loose in turn 5-6 or so, and if you know Summit, that's about the slowest part of the track. Which is right after the part of the track with the highest pucker factor IMO (downhill at 80-100 depending, about a 30 degree turn a little off camber and max braking soon as you're through it). So I am OK and there is no body damage.
The hub flange sheared right off, and the wheel getting pushed back it must have bent up either the brake caliper or the slide pins, the caliper doesn't float any more. A guy with a TA next to me thankfully had a spare hub, so I got that on and drove carefully home. This was a Mike Minear hub so I'm contacting him to see if he wants to inspect it. I'll probably get a new one from him over the winter.
I'm thankful that was all relatively low drama. If that happened almost anywhere else on track, well all the other places are pretty high speed, and it would've been a real wreck, literally.

Chris

[roostmeyer]

Wow no beech marks or necking, looks like they went without any warning. Maybe a problem in heat treatment and/or metallurgy may have made the spindle brittle.

[PeteL]

Wow no beech marks or necking, looks like they went without any warning. Maybe a problem in heat treatment and/or metallurgy may have made the spindle brittle.

I know it's fun to speculate, but as a materials engineer who reviews failure analysis reports on an almost daily basis, I would never attempt to read a fracture surface based on a 1X magnification snapshot. There's a lot of relevant information on that fracture surface you simply can't see in those photos. There's also some things clearly visible in those pictures that are red herrings. Like defusing bombs, failure analysis is is best left to the pros.