Obviously they are meant to extend the hub, however the only ones I know of won't fit 4 lug E30s. In any real world application, how much of a benefit are these things really? How much could they increase the life of say a wheel bearing? An open invitation for a discussion.
The TMS hub extenders are made of high-grade, lightweight aircraft aluminum. They will press into a stock 72.5mm (Oustide Diameter.) Hub extenders are used to help keep the wheel centered and are extensions of the stock wheel hub. They are needed if a TMS 8mm or 10mm wheel spacers are used. They will also work with H&R 5mm spacers! Each hub extender is anodized for protection and corrosion resistance. These are for the front hubs and DO NOT fit the E46 Xi, E39 5 series, or E30 4 lug. These do fit E30 M3.
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