i smell bacon
Join Date: Mar 2010
Bikes: Geekhouse Deerfield, GT Edge Ti, Spooky Skeletor, TET Track, Ritchey P-650b, Bridgestone MB-3
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Yes. Just use some calipers or a ruler and measure them. A 3/32" chainring should be about 2mm, and a 1/8" chainring should be about 3mm. The difference may seem small, but at this scale it should be pretty obvious. Make sure you're measuring the tooth, and not the ring or the tapered edge of the tooth.
If you have another bike with a known chainring size, you could try comparing to that.