Modern Vespa

I think I know the answer, but I'm asking anyway.

My BV felt a little bumpy on the road in light rain a couple of weeks ago. I haven't been back on since due to other issues. My tires have a 2017 date on them, but the bike is '18. I bought it new in June of '19. Mileage is 8,600 (mi, not km).

I've had 4 years of riding it, dry roads (for the most part), garage kept.
There's no cracking on the sidewall area of the tires, the tread still looks good. Air pressure is where it's supposed to be at.

Is it time to get new tires? I don't want to switch something that doesn't need switching, but I know they say every 5 years (or sooner).
TIA.

If I was thinking bumpy and tires, my first thought would be overinflated. What are your psi and what's manufacturer spec?

FWIW:

Oooh this is super helpful; thank you! No bulge. Manufacturer says front tire is 31.9 (so I have it at 32), and the rear is 37.9, so it's at 38. Maybe it's something else. I really appreciate the clipped part of your response; thank you.

If that's one-up not two-up, then that could be argued as slightly over-pressured in the rear. However I always like my tyres to be ~2 psi over the book numbers.

At that age I'd be considering swapping out the rear - 8,600 miles is a long way for a rear tyre to last on any PTW. I'm lucky to get 4,000 on my GTS - the GP800 used to eat rears at the rate of one every 2,500 miles.

Glad it was helpful.

The link at the bottom of the quote has a video if you need visual examples of the issues mentioned above (other than punctures).

See what I did there Jess

Not a bad age to change tires as such - on the early side if there is no visible wear.

I'll guess there aren't any balancing weights on the wheels that are gone missing?

In general, the date when a tyre has been taken into use is more important than the manufacturing date. A non-used (literally, non-inflated etc.) new tyre could be stored even up to a few years in good conditions and it is as good as new.