Spare on C230Kompressor

Just had a flat on our C230 Kompressor Sport Sedan and was very curious as to why what looks like a standard rim and tire carries a sticker saying it should not be driven over 50mph. This is not one of those mini-spares, it
is 16" vs. the 17" sport rims but the tire height evens it out when on the car.
Our dealer was no help and MBZ USA told me they put the sticker on so people won't drive around on the different rim for very long. I understand the time thing, but could going 65 or 70 cause a problem that doesn't seem obvious?
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"Midlife"

One of my car's manuals (1999 C230 Kompressor sedan) clearly states that the spare is "structurally reduced" to save weight.
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in article snipped-for-privacy@post.usenet.com, Zaphod at snipped-for-privacy@SparkingWire.com wrote on 8/11/04 5:08 PM:

That's interesting. I've checked our car's manual thoroughly and can't find any suggestion that the full size rim is not a 'normal' rim. There is no warning about restricted use for that rim. The tire on it is a standard Michelin 16" tire, not the one MBZ describes as starting with a "T" in it's number designation, that is used on the skinnier set-up and requires only temporary, low-speed use. Normally I wouldn't care, but the sport alloy rim was damaged and we have to wait for it to be repaired. We live in 'freeway' country, so the speed thing is a pain.
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