I can really recommend WA Mountain Bike Adventures.
They provide a great way to explore Western Australia’s excellent mountain bike riding - the Perth Hills, Jarrahdale, Dwellingup, Margaret River, Nannup and beyond into the South West of Western Australia. They do downhill shuttles as well as day+ adventure tours and they can introduce you to the Munda Biddi trail and get you started on your journey from Perth to Albany.
The type of vehicle they use can accommodate small and larger groups and is very comfortable. The modern bike trailer they use is easy to get your bike onto and keeps it safe.
The owner, Tim, is also a driver and bike guide and seems to have a real passion for mountain biking, being fast on the bike but also an adventurous explorer of the lesser known trails.
He clearly loved the bush we rode through. On breaks from riding he pointed out lots of wildflowers and native orchids. While riding he spotted a black tailed wallaby (very cute).
He makes a great morning tea and lunch for the day+ trips and chats as you want while letting you enjoy the quiet times between rides.