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On the inside (backside?) there is usually an embossed or stamped symbol "ET" followed by a two-digit number -- for example, "ET20" or "ET25" -- that's the offset. Or else there's a full wheel description, such as 6.5x16x25, the last two digits being the offset.
Your 940 (if the early version), and 740's, had a 25mm offset, whereas all 240's have a 20mm offset; but this is perfectly interchangeable. I use Hydra 16x6.5 inch (offset 25mm) on my 240s.
More important, if you're considering 240 wheels, is their diameter -- many 240 wheels may not be big enough to clear your brake caliper.
Good luck.
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