Karakoram Bikers is fantastic. I initially asked them about motorcycle rental, but additionally got tons of support regards my travel itinerary, visa requirements, weather info, and so on. Liz and the team were incredibly patient and helpful with my inquiries, and it was an absolute pleasure meeting them. This is what it's all about -- no silly hidden fees, just a small, authentic and honest company that is straightforward and down-to-earth helping other travelers have an adventure.
The motorcycle (150cc) was in great condition and I never had any mechanic trouble making my way through the mountains of Hunza. Throughout I stayed in touch via a whatsapp group for updates and advice.
The pricing is very fair for the immense value you get. Without hesitation, Karakoram Bikers comes highly recommended! And go for it -- my 2 weeks adventure on the bike was among the best holiday I've ever had.