Re: wheel size confusion!
The info posted above I cannot confirm or deny, so I can't speak for them one way or another, but if you want to be absolutely certain you're as close to equal track width front to back as you can get, you really need to measure the width of your front and rear axles from wheel mounting surface to wheel mounting surface.
Now, take your wheel width, subtract your desired backspacing, then multiply by 2 (for each side) and add to the axle width and you'll get the approximate width from lip to lip.
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