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I would do something that is either hyper silver or hyper black on that color car. If you go all black for the wheels it looks too "RoboCop" like, which I don't care for. I did 18x8 wheels with a +35 offset. You could go up to an 8.5" wheel with. +32-35 offset on this car, but your tire size options are a bit limited in that width. If you go with 18" wheels the matching tire size is 235/45/18. This is a very common tire size so there are lots of choices. However, a 235 on an 8.5" wheel is slightly stretched. Not a big problem, but if you are not careful, you are going to curb your wheels very easily. That's why I went with 8" vs 8.5" even though the 8.5" would have looked better.

Increasing weight isn't too big of a problem (within reason), but increasing your contact patch increases rolling resistance and that leads to less range. That said, I feel that the stock 215's are too small to properly support the cars weight and it's weight distribution through corners. A slightly wider tire will dispurse that weight over a larger area leading to more overall stability and should increase the life of the tire. With that said, expect an electric only range drop of ~10% with wider 235 tires.

Also, you can use 5x114.3 wheels on this car despite it's 5x115 bolt pattern. You MUST USE HUBCENTRIC RINGS and you need to be very careful when mounting the wheels and torqueing them down so everything stays nicely centered. Tighten them a little at a time until everything is firmly tight, then do a final torquing. Take it for a quick drive, check for any wobbles or anything funny (there should be no issues) and do a second final torqueing after the test drive. If you let a dumbass with an air tool install the wheels they will likely torque them from full loose to full tight one at a time leading to a slightly off center mounting. No air tools should be used on your wheels at any time but tire shops need to save time somewhere in the process.
 

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Most moderately priced aftermarket wheels look . . . . cheap and do nothing to enhance the look of your ride. Nice ones which do are usually very expensive. I've always liked buying 'take-offs' from newer cars of the same model as I'm driving - In this case, pick yourself up a nice, clean set of Gen 2 wheels for your Gen 1 Volt. You can frequently find them near new for 1/2 or less the GM parts counter price. You won't look flashy, but you won't look cheap either and the wheels will be much less likely to bend when you hit a pothole than if you spend about the same amount on aftermarket wheels

Don
Not to throw shade, Don, but you don't know what you are talking about. For one, you can get some amazing aftermarket wheels at very affordable prices. You don't have to spend a fortune to get great quality and great looking wheels. Secondly, the second gen wheels don't have the same bolt pattern at the Gen1's. They arent even close.
 

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Thank you for the responses.

Tommy, I am by no means wedded to a Black rim. Hyper silver or hyper black are possibilities; at the same time so are the types of stokes. That is in part why I am looking for options / suggestions that would not break the bank, or may be good and affordable. All the info you are giving is great, but it is really what I am way over my head with. I have seen some sets of rims on ebay that seem to fit and thought to pair them with tires from tirerack (then bringing it all to a shop to mount).
Do you have a style of wheel that you like? Do you like lots of spokes (10-12) or do you like less (something like 5 or 6)? What about double spokes? Mesh sytle? Euro style? Japaneese style? Concave? Deep lip? Multi-colored?

It's hard to give any suggestions, including photos, without knowing what style of wheel you are looking for.
 

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Here is an image of black wheels on an Ashen Grey Volt:



It doesn't do much for me, but if you like it then that's all that matters.

I used to have a Mazdaspeed3 in Metropolitan Grey Mica which was a dark grey metallic with blue and green pearl that would catch the sun well. Anyway, I put on some 10 spoke Motegi's in Hyper black on the car. I thought the wheels really popped with that color:
Land vehicle Vehicle Car Rim Mazda
 
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