Quote:
Originally Posted by doughboy
Maybe on the M2C as OEM is Mich PSS, which is an awesome tyre.
But generally an OEM tyre is just about cost / availability and a marketing exercise.
Most cars have a variety of OEM tyres depending on what was available from the approved list in stock at the time of build.
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Typically an OEM such as BMW will source tires from two suppliers to ensure that demand can be met if there are production/shipment issues. That said, for a small car line such as the M2C, I wouldn't be surprised that they sole-source Michelin(which they did).
The OEM tire is specifically designed for the car. It's gone through numerous iterations on the M2C for optimal performance in dry limit handling, dry handling, wet limit handling, wet handling, snow handling, snow stopping, braking, acceleration, noise and treadwear. It was built and tested in the exact size that is on our car.
The replacement tire is designed to whatever car the manufacturer decided to test with, could have been an S4 for all you know...or maybe it was extrapolated from a different tire size(225 instead of a 245 or 255) altogether.
Quote:
Originally Posted by doughboy
Most cars have a variety of OEM tyres depending on what was available from the approved list in stock at the time of build.
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Thats not how it works at all. When a new car is being built, tire manufacturers will submit tires to an OEM through a fairly robust RFI/RFP/etc process. After the development starts, there are multiple iterations from both tire manufacturers and oem manufacturers to ensure that the performance targets are met.
OEM's don't just grab "pre-approved" tires off the shelf.