I bought mine from Quattro Tires. Offset was not an issue.
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Thanks rickyrsx. To try to answer my own question above about offset, I have gathered the following:
1) Offset determines how far in or out the midline of the wheel sits relative to the hub. As Vezz66 says, it is to the
midline of the tire/wheel so is not automatically forced to change by changes in wheel radius or width (though see below).
2) A positive offset (like the OEM, 50mm) moves the wheel in ("tuck"). Smaller numbers means the midline of the wheel is that many mm further away from the car (less "tuck".) Most wheels I see are in the 38-45 range, meaning their midlines sit a few mm further out than the OEM wheels.
3) Assuming same size outer diameter of tire+wheel, then offset determines the "scrub radius" which turn affects various characteristics of the handling: (
see this pic): does wheel rotate forward when turning wheel (think parallel parking); what happens to handling when one brake is out (mu); whether there is a pull, or maybe a toe, or not to one side or another when accelerating or braking; some kinds of bearing wear; whether there is something called squirm, which sounds bad.
4) Therefore, to be formal about it, one should have the same offset as the OEM if possible, to avoid changing the handling characteristics of the car. Some say within 5mm of the original offset.
5)
HOWEVER, if you go to a narrower width wheel, the tighter wheel on the same centerline might rub the calipers (again,
see pic ) ...so as you go to narrower wheels, the offset usually needs to decrease (less "tuck") to move the wheel out away from the calipers. This is why the typical offset is less for narrower wheels.
6)
Also, most of the comments re. this are on racing websites. Not tire websites, suggesting it may be mostly an issue for high-performance users.
7)
And, none of the online tire places seem to care about this: discounttiredirect, including discussing with a person there, paid no attention to offset (out of the wheels considered compatible).
My take: this is probably a real, but minor, thing, as long as you pick a wheel deemed "compatible" by a vendor (so it won't rub the calipers or car body). I already bought a set of wheels with offset 40 (10 mm different from the OEM offset 50). Other people have done the same. So I am not going to worry about this at all. However, if I buy a set for my wife's car, all else being equal I will probably find a wheel that has an offset within 5mm of her OEM wheels (which may push me towards full 18" size snow tires, for reason (5) above, instead of the 17", if cost is not too different).
P.S. re. hub centric rings, also a question of mine above: per "dana", Discount tire direct
uses (if you have them install), but per my own order experience does not
automatically sell you if you buy online, Gorilla hub centric rings to adapt the hub size to the OEM. So I ordered them separately.
Sorry to, in essence, use bandwidth to answer my own questions but I'm trying to assemble information in one place for people like me new to this.