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What are the practical aspects of using good quality hiking boots (e.g. ones shown below) for climbing?

Arguably, an outdoor enthusiast might be involved in various sorts of activities from hiking and camping to climbing to mountaineering. Now suppose said enthusiast is not keen on having specialized gear for every single sub-activity. Can a solid pair of hiking boots serve all purposes? Especially on a backpacking/camping trip where one carries all one's gear on one's back.

I know that paired with crampons or snow-shoes, and the right pair of socks, they are fine for cold and higher altitudes. What about moderate outdoor rock-climbing?

For easy climbs you have quite a good chance to be OK with hiking shoes.

The most important property for a shoe to be usable for climbing is, that you have to be able to stand on contact points so small that only a part of your toes' length fits on them. To achieve that, you have basically two possibilities:

1. You take a flexible, very tightly fitting shoe with a thin rubber sole where you can stand on small pieces by actively exerting force with your toes and the arch of the foot. This is the climbing shoe approach.


2. Take a quite heavy shoe with a sole that is stiff enough that it does not flex when you stand on a small edge at the very tip of the shoe. In that case the force to stand on small items comes from your ankles. Hiking boots which are at least partially crampon compatible typically have such stiff soles. Also, this type of shoe was the normal climbing shoe before the invention of specific rock climbing shoes. Of course you will not be able to stand on super-tiny edges and your mileage may vary depending on the type of rock but for easier climbs and the occasional climbing or scrambling section on a hiking tour you will be quite fine.

Both shoe types have in common that their sole has a pronounced rectangular front edge which allows to step on rather small edges with good precision.

Other types of shoes, such as trainers or gym shoes will be much worse compared to those, since they have a thick, but very flexible sole (causing not very precise feeling for the things you stand on) and if chosen at a wearable size are reaching too much over the front of your toes, such that you have neither have a defined front edge to stand on nor a good force transmission to the sole, so it will be very strenuous for the toes and arch of the foot muscles to stand on small features.

To summarize: if you want to take it serious and can afford the extra money, pack weight and space, go for real climbing shoes. For easy climbing or some occasional climbing section on your hike, your hiking shoes should do OK. Normal sports shoes will perform much worse, so taking those will be a waste in money and energy -- the latter both while carrying them and while climbing with them.

Compared to even the most basic climbing rig, shoes are small and light so not carrying them doesn't really help with your load. Climbing kit is expensive, with or without shoes, but shoes are much more personal than some kit that can be borrowed or shared, so you may be able to save some money. The thick sturdy soles of boots are almost the opposite of climbing shoe soles, which allow your foot to conform to the rock. This will seriously limit what you can climb.

On the other hand, most of my climbing was done in boots - and it was very basic. You can certainly have a go, to see whether climbing is something you want to commit time and money to doing properly, but don't expect to progress very far. For me this worked well, as I found that I enjoyed other activities more before climbing cost me very much.

That type of boot is pretty standard for hiking and mountaineering and they work fine for climbing up to a point. I have done plenty of 3rd class ascents in boots like that.

For going up talus fields or piles of large boulders they work great, as soon as you need to smear or hold onto very small ledges, they don't work so well.

The short answer is that they work well for broken terrain and up to Class 3 ascents, but as soon as you need a rope on rock, climbing or approach shoes would be better.

Mountaineering boots are made for rock climbing - in addition to hiking, walking/climbing with crampons, ... This means there is a compromise between multiple purposes, while dedicated climbing shoes are just for climbing (if you can walk comfortably in your climbing shoes, they are too big or specifically not performance oriented).

I think the hardest climb I did in mountaineering boots was a French 5c (alpine style, i.e. using any means to ascend). That's an extreme example, but depending on your experience and circumstances (how well is the climb protected), climbing up to UIAA V/French 4c is typically done in mountaineering boots. If there are longs stretches of climbing harder than UIAA IV/French 4a, you'd typically use climbing shoes. While climbing shoes are indeed not very heavy, they definitely are definitely very relevant if your on a multiday mountaineering endeavor, where you are happy about every peace of gear you can leave at home.

And roped up or not is pretty much independent of whether your climbing in boots or climbing shoes. I can't imagine a situation where you use climbing shoes but no rope, but there's plenty of situation where you climb with mountaineering boots with or without roping up.

TLDR: Climbing shoes are better, but mountaineering boots are perfectly fine for easy climbing. If you get hooked by rock climbing (you will ;) ), you'll want to get dedicated climbing shoes though (your climbs will become less and less easy).

You mention hiking boots but you show what are more like mountaineering boots. The difference between the two types of boot have implications regarding their use for certain types of climbing: Hiking boots will have slightly softer soles (possibly with rounded edges), allowing "smearing" or gripping sloping flat rocks. Mountaineering boots will have stiffer soles with sharper edges, allowing you to catch onto tiny rock edges.