Yes Mimi, worms. Lots of them.
Seems worms love to cross the paved roads during rainy seasons. Some stretches of road I see hundreds of little wromy smudges on the road - that USED to be worms.
The live worms I try to avoid hitting (last month it was wollie bear caterpillers in droves on the road), I zigzag around considerately dodging the nightcrawlers.
But I thin k some of the already squashed ones wind up on my tires and get flung over my bike as i ride. I agree...GROSS!
It's not like every day, mind you, but I'm putting in about 100 miles a week these days, and worms happen. Then they dry up on my brakes or my bottom bracet or under my downtube where I don't normally look every day. Like like strings of beef jerky spaghetti.

EEEEWW!!!!!

But my bike is now sparkling CLEAN (for the moment).