The BladeForums.com 2024 Traditional Knife is available! Price is $250 ea (shipped within CONUS).
Order here: https://www.bladeforums.com/help/2024-traditional/
The single one knife that I think would be most useful is a Leatherman or swiss army knife. If you're going biking, having the extra tools they provide on hand can't hurt.
I would bring a small (6-7 inch overall) fixed blade. I was at a gun/knife show yesterday and saw a knife by Blind Horse Knives that is really nice. Look them up. Either way, I would bring a small fixed blade, obiousy aside from the SAK.
Ezzekial, since you carry a multi-tool, I'd second the recommendation for a nice, medium-length fixed blade. My personal favorite is Bark River,