They are hiking trails and not suitable for a bike. You going into the unknown if you decide to take these trails. I know a German guy that tried something similar a few years ago and was airlifted to rescue when localized extreme weather caused major problems for his safety. The weather should be calm and settled if you attempt these trails with a bike. Try and speak with locals that know the area. If you go between june-august there could be massive amounts of mosquitoes to deal with as well.