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What are the wheel specifications of a EU 2.0 Roadster sport (or are all variants the same)? I am interested in OEM values of PCD, offset (ET), center bore, wheel nuts/bolts/lugs specs etc.
5x110mm 65mm bore
16x6 ET 25 front
17x7.5 ET 38 rear
All wheel versions have the same specs (US models at least).
Aftermarket wheels with around ET 40 will work on both front and rear as long as they clear the calipers.
I don't know what alloy of aluminum the wheel is, but aluminum loses a lot of strength after welding if it is not properly heat treated. The heat treatment might compromise the benefits of the forging. So it could probably be welded to look pretty, but it's probably not going to be strong.
6061 aluminium alloy - Wikipedia
Typically, after welding, the properties near the weld are those of 6061-O, a loss of strength of around 80%. The material can be re-heat-treated to restore -T4 or -T6 temper for the whole piece. After welding, the material can naturally age and restore some of its strength as well. Nevertheless, the Alcoa Structural Handbook recommends the design strength of the material adjacent to the weld to be taken as 76 MPa (11,000 psi) without proper heat treatment after the weld.
Been years since I last shopped aftermarket wheels. Surprised to see how difficult it is now to find a decent wheel below 18" diameter. If I was in the market, I'd seriously consider something from CCW - Home - CCWheel. The Twisted Classic would be my pick.