Rode through Colorado, N to S last year on the Divide. I was bimbling so slept many nights alone in the woods, mixed with a few motel stops. I wouldn’t worry too much about black bears.
Americans generally tend to big up and sensationalise the risk, with any sighting becoming a social media epic, but miniscule records exist of black bear intrusions on camp when people present. Advise I got from the old timers was to hang your food and toiletries. Keep a few stones by your tent so if a bear comes in you can scare them off with the stones. Read up on riding in bear country and making lots of noise and you will be fine. Worth noting the bears are more scared of you, so will avoid, unles surprised.
No grizzlies in Colorado so nothing to worry about. I had dumped my bear spray in wyoming, as wasnt needed in Colorado.
Oh and Salida was the coolest place I visited.