Going up to Mission Peak using the Stanford Avenue entrance for hikers is a benchmark. For bikers, this is an extreme challenge. This route connects to the Peak Trail
which leads to the summit and is a much harder climb compared to the Ohlone College route. You'll need both physical and mental preparation.
As soon as you hit the first cattle gate, you'll find yourself already in an uphill battle. Don't expect the trail to get easy on any section. The fire road is usually packed with hikers. Most of them don't see bikers on this route often and usually would look at you with amazement. Some may cheer you on.
The trail doesn't have any shade which makes it even harder on a hot day. However, it does have a few vista points with benches. The view down to the bay is pretty rewarding.
This trail can also be ridden down, but do watch out for hikers (especially on the weekend). For that reason, going down using this trail isn't that fun. I recommend going down using Peak Trail
or Peak Meadow Trail