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Billy Epic is an old-school descent on the Westside that's somewhat isolated from the more popular trails in the network.
It's located near the Rainbow Waterfall area and is accessible from the trailhead for the falls, which is very popular with hikers. The route shown here is the quickest loop to access Billy Epic, which ascends steeply up the 27 Switchbacks section of the Flank Trail.
From the climbing trail, you'll enjoy beautiful views of the rushing mountain stream and, eventually, Rainbow Falls.
For many riders on non-motorized bikes, much of 27 Switchbacks will be a hike-a-bike, but strong riders can likely pedal it.
Take a right where the bench cut resumes and pedal a bit further to reach the top of the descent. Near the top of Billy Epic, you'll see junctions for a few trails, including some multi-use moto trails.
Billy Epic itself is also open to trials motos, which leads to quite a different trail riding experience for the Westside.
Look for the trail sign to pick out the correct entrance to Billy Epic. This steep, loose descent rides the line between a single black diamond and a double black diamond.
Some maps note that there are alternate double black diamond options on the way down Billy Epic, but once you drop into the gut of the descent, it's hard on a first ride to spot where the splits are and which ones are more or less difficult.
It's possible that you could find yourself unknowingly dropping into the more challenging double black diamond alternate lines, so be fully prepared for all manner of gnar on this difficult downhill rip. Unlike many other trails on the Westside, Billy Epic is quite steep and tends to get loose in dry weather.
There's a substantial amount of loose, sliding scree in narrow chutes and eroded trail tread, due to the shared use status with trials motorcycles.
The soil is quite unlike the typical dark black dirt found in the deep forests of BC, and once it's turned up by the motos, it makes for quite a different MTB ride style than you might be used to from the rest of Whistler.
However, if you're used to riding loose scree in higher elevation zones in the Rockies, you'll make out just fine.
Otherwise, the steep fall line descents with uncertain traction could be tricky. Because of the loose soil mixed with scree, Billy Epic is a much better ride when there's some moisture in the dirt.
It's also known as a good place to go for a wet-weather mountain bike ride.
In part, avoiding slippery wooden bridges makes for a safer ride in wet weather. On the lower section of the trail, you'll encounter some steep drops and rolls.
One section, in particular, has several different chutes and line options to choose from, ranging from quite difficult to extremely challenging.
For a few of these sets of chutes, you can pause and take a look at the lines, but others don't have much of a stop zone before you roll in.
Make sure you're prepared for anything!