Greetings all. First post from a 2018 Himalayan owner, had it since new and love it, though it’s not my only bike (also have a KTM 1290).
I do a lot of trail and off-road riding on mine and was also looking for aggressive tyres. I ended up going with a Mitas E-09 Dakar on the rear and an MT21 on the front. Works great as a combination. Really deep mud will be a problem but it will for any tyre, obviously. Normal mud is ok. Also this is a good combination for gravel and rocky tracks, both tyres are aggressive enough and very tough. On road they are fine too, but the MT21 is pretty loud so earplugs are handy!