the main differences between a hiking boot/altberg and a motocross boot - and to a lesser extent the Sidi - are the external lateral articulating braces - this is the part that will prevent severe ankle injury - stopping your ankle from twisting - combined with the hard external plastic assembly providing a much higher amount of crush/puncture resistance when your peg, or part of your side stand/centre stand or other part of your bike tries to go through your boot, by doing a better job of spreading the force over a greater area.
The Altbergs have got a lot better for sure, but cannot offer this level of crash protection, I don't want to wear my motocross boots overlanding personally, the Sidi Adventures, whilst not offering motocross boot protection at least have a decent external brace and very good heel protection and I can walk all day in them, I have found them to have the least amount of compromises IMO - apart from the price.
A friend of mine had a nasty crash on Ruta 40 in 2010, coming off the bike at speed wearing fairly sturdy hiking boots, this person is still having major ankle problems 3 years later, with cortisone injections and on going rehab, has had to take lots of time off work and is no longer is able to ride.
You Choose.
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