Legally the EPA requires that the pepper concentration be between 1% and 2% for bear spray. Any products labeled and sold as "Bear Spray" in the US will be within this range. As indicated in links I posted upthread, this concentration has been shown to be effective by actual experience.

Note that even if you had a gun, you would still be faced with the same problem of shooting at a moving target, while you are also moving, furiously pumping the peddles of your bike. A rather challenging shot, to say the least.

Here is from one of the commenters.

"Susan Rogan • 14 hours ago −
..... The reason I am posting twice with stories is that I believe the wolves at least in the Yukon are becoming more bold, and I am not the only one who thinks this. ....."

The wolves of Joint Base Elmendorf-Richardson in north Anchorage have paid the ultimate price for their fascination with people and their pets. Officials of the Alaska Department of Fish and Game says state wildlife biologists, with help from a state-sanctioned trapper and military personnel, have over the course of the winter managed to kill nine of the animals. They are thought to be members or former members of a pack that had developed a taste for dogs.

Dogs, unfortunately for the wolves, are often accompanied by dog owners. Some of them became frightened when wolves threatened their pets, and state wildlife officials began to get increasingly nervous about the lack of respect wolves were showing the pet owners.
---------------snip------------------
Tissue, bone and hair samples from the wolves killed over the winter are now being analyzed. That should help state biologists determine the dietary habits of the animals. Wolves living on the outskirts of Anchorage predominately feed on moose, Dall sheep and -- in the summer -- salmon. There is some curiosity as to how large a part of the diet dogs had become for some of these wolves. Loose dogs are a pretty easy target, and untold numbers of them disappear in the Anchorage area every year. There are also some questions as to what else the wolves might have been eating.

Some have wondered whether they might have become habituated to humans on the bases as much because of easy access to garbage as the access to dogs. Fish and Game did warn base residents that "to prevent future problems, area residents must take precautions not to leave out garbage, pet food, or other attractants that might draw wolves near homes and into neighborhoods."

Note that even if you had a gun, you would still be faced with the same problem of shooting at a moving target, while you are also moving, furiously pumping the peddles of your bike. A rather challenging shot, to say the least.

A plus for the bear spray in this case was that while it didn't stop the wolf outright, possibly due to the improbability of being completely on target in this scenario, it sounds like it did slow the wolf down enough to allow the cyclist to ultimately get to safety. I would think the wide dispersion the bear spray provides was a significant factor in this.

Note that even if you had a gun, you would still be faced with the same problem of shooting at a moving target, while you are also moving, furiously pumping the peddles of your bike.

Negative, Ghostrider! I would have stopped, let the wolf get closer, and shot the everloving shiite out of it.

I don't think so Glock. According to the link in the original post the wolf "..... raced forward and attacked my panniers, in the process ripping my tent bag and spilling my poles onto the highway." If the wolf was close enough to rip your panniers he would have been ripping "the everloving shiite" out of you the instant you slowed down! By the time you actually stopped, you would have been lunch.

This surreal moment of shock and confusion passed immediately was the “dog” lunged for my right foot and snapped its jaws just missing my pedal.

WOLF!!! At this point I received the biggest jolt of adrenalin I have ever had in my life. Without so much as a thought I shifted my bike to the highest gear possible, started to mash the pedals like never before, and reached for the bear spray in the handlebar bag. I threw off the safety and gave the wolf a quick blast in the face which served to slow him down so that he was now 20 feet behind me but still not stopping. He hung back for maybe 20 seconds and then raced forward and attacked my panniers, in the process ripping my tent bag and spilling my poles onto the highway.