The biggest reason I haven’t made the change is because I already have significant money invested in 4x108 wheelsets. I’m also uncertain if most 17” 4x100 offerings have a hub bore large enough to accommodate the Fiesta. I do plan to begin looking into the cost of converting to 5x114.3 hubs and custom axels when I change to an engine with much more power and 9” wide R-comp tires that provide far more grip. It still may be more cost effective to have two sets of custom 17x8 et30 4x108 light weight wheels built than it would be switching to a different bolt pattern.
I’ve proven to myself (and maybe others) that our existing OEM hubs are quite strong. My original hubs were tracked for almost 8 years and over 30k track miles (probably closer to 40k but I’m under estimating because I haven’t taken time to calculate exactly how much tracktime they actually had). I will keep more accurate usage data on the new hubs, however. It’s also fair to say that the hub that failed has significantly more force applied to it than the other three since it’s the driver front and my primary tracks run clockwise.
I don’t think this failure should be alarming to anyone other than those of us who heavily track our cars and run high grip tires. Hubs and wheels for all track cars are consumables and must be replaced to prevent catastrophic failure (while on track). It was 100% my fault for not taking this into consideration. I should’ve changed them earlier.. Given my car setup, driving style and the tracks I frequent, I have decided to swap them every two to three seasons and carry spares in my track box. I ALWAYS check them before every event but in my case it was impossible to visibly see a sign of imminent failure.