It's not been documented but I bet wheel weight is also a factor, I've nearly always had sub 8kg on my cars
Going low, heavyweight wheel/tyre combos and the cheapest aftermarket shafts available cannot be a good recipe for longevity
When coloured mirror caps sell at a far higher price point, than proper engineering
you can see all that is wrong with the mini aftermarket world today ::getcoat::
Did this a long time ago but I think I got new jr shafts after oem boot split, thought why not upgrade to new whole assembly……but ended up just getting a new boot kit from memory as less faff in the end, cups were different profiles so could not cleanly make a hybrid
Oem shafts never died with lots and lots of miles and power ( disclaimers if you find a different story here 10 years ago or so 🤣)
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