I've always done the 13 month thing on my cars. Honestly though, I think my bikes were last inspected 4 or 5 years ago, guess I'll hafta start doing that... Wish we could get with it like other states that are doing away with the inspection thing altogether...
I used to do the same thing, but got the $92 ticket (VA) two years running. The inspection tends to expire over the winter, and the first good spring riding weekend, the Troopers set up checkpoints at all the favorite riding intersections (cars, bikes, everyone). $92 buys a lot of $16 inspections.
You think I would have learned after just one, but no, it took two.

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Given the quality of the inspections conducted on bikes, it's nothing more than another tax.