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Wow. that is nasty. Honestly glad for you that it ended as safely as it did. I suspect that was probably an off brand hub with bad casting materials. The cracks at the screw holes are negligible in my opinion, cracks almost always migrate to the least path of resistance. Sucks that we will never actually know the root cause.
had the same happen to me a few years ago, found out its a rather common issue with tracked s2k's. change out those rear hubs every year or two depending on usage or better yet get the karcepts
Here is closeup picture of backside of right rear hub. There is a crack in the rotor retention hole and into the flange. Can't say for certain that the crack started in the hole but..................Crack not evident from the front and would be difficult to see it with the hub still on the car. Karcepts look great and will give some piece of mind!
Its fun for me to apply my work to motorsport but i realize not knowing the car's history Im reaching here. I started working in aerospace manufacturing a few years ago. The holes are where my group would consider the greatest risk for cracks. Hole making techniques are high probability for abusive machining. The automotive sector has low standards for hole edge breaks relative to motorsport needs. That said, hubs , are wear items. Somebody at the hub's design review drew the line on how long the hub should last based on risk and cost. My home track Sebring eats hubs. Hubs are over built for their designer's intended purpose on street cars but eventually the curbs and lap count wins.
Someone should check to see if Jseries hubs fit, cause they appear to be identical as the Karcepts, but without the $400 price tag.
The "Jseries" flange is 139.5mm vs the S2000 flange of 139.2, otherwise, every other metric is identical.
Might be worth ordering one, see if the axle spline diameter fits and if the hub shaft is the same length. Boom, if it does, then it could be a stronger option at $50 vs. the $400 Karcepts option.
Someone should check to see if Jseries hubs fit, cause they appear to be identical as the Karcepts, but without the $400 price tag.
The "Jseries" flange is 139.5mm vs the S2000 flange of 139.2, otherwise, every other metric is identical.
Might be worth ordering one, see if the axle spline diameter fits and if the hub shaft is the same length. Boom, if it does, then it could be a stronger option at $50 vs. the $400 Karcepts option.
ive got to rebuild a set over the winter. Maybe I’ll try this and see
Interesting progress chaps
