Roadbike with aluminium wheels in mountains. Is it safe? I'm planning my upcoming trip to ride real mountains in Spain on my road bike. So far I used Mavic Ksyrium aluminum wheels but mostly on flat areas.

I'm not confident with going downhill on this wheels because when I do downhill my wheels becomes hot from braking. I'm using clincher with tubes inside and standard Shimano brake pads. Should I be worried? Is it safe for inner tube?

I'm asking because I've heard a story about exploding inner tube from heat :(

I was thinking about going tubeless but never tried this on my current set and I don't want to experiment until its needed.
When people talk about blowouts from braking heat, they're usually referring to latex tubes being used with rim-brake carbon clincher wheels. This combination can indeed lead to blowouts on long, fast descents if you aren't careful. I used to run latex tubes with my carbon race wheels, but after having two tube blowouts, I switched back to traditional butyl tubes and never had the issue again. If you're concerned about heat, just ensure that you're using butyl tubes, not latex.