From the trailhead north of Clohesy Lake, follow the trail south that contours above the east side of Clohesy Lake and continue past the turnoff for Missouri mountain. Drop back down to valley level after the lake and continue walking on the usually somewhat wet trail south for a little over 2 miles. All along the way, you'll enjoy great views of Pear Peaks' rugged north face. In tundra basin at about 12,000 ft., depart the trail and walk on tundra to a rock-covered bench area below the left side of the north face. From here, you'll need to make a decision as to ascent route. The way we went up was fairly difficult (approaching Class 4) with some exposure. If you prefer an easier route, what we describe as our descent route can be reversed and should not be any worse than some modest 3rd class scrambling up a loose couloir.
To continue with the north face ascent, from the rock bench, turn SSE some and continue ascending on either a snowfield (early season) or rubble for another 400 feet in elevation. Watch for an upward sloping, narrow bench that heads more to the left and works up to the east ridge of the peak. If you don't find this bench, you'll probably encounter rock ribs to clamber around on until you intersect the east ridge at about 13,100 - 13,200 ft. (?) We did this in early enough season where snow forced us onto some of these ribs. The last bit of scrambling to the east ridge we found a little unnerving and exposed 4th class work.
Once on the narrow east ridge, you'll find the going easier than the exposed north face, but still slow, rocky, and exposed at times with a few minor obstacles. Continue on mostly Class 2+ to the summit, where you'll enjoy and view all the way back down the Lake Fork valley.
For descent, head down the slow east ridge form the summit. As you approach Pt.12,818, there will be two notches to negotiate. The first will require a brief drop and then you'll need to regain the ridge. The second drop is more difficult with both a steep down climb and re-ascent. Since by the time we reached this location it had rained and all the rocks were quite wet and slick, we chose to head down to the right from the ridge into a steep couloir, exit the couloir about 200 feet down and then contour around the base of Pt.12,818 until we could intersect the ridge again. Cross back to the NW as you find a way across the ridge and head down a broader and less steep gully back down into the rocky basin. Find your way back to the trail and walk 3 more miles back out to your waiting vehicle north of Clohesy Lake, if you have 4WD.
Bonus Points: If you have time, since you've already invested over 3 miles of hiking to climb Pear Peak, it would make a great deal of sense to go ahead and include UN13,762 (aka: Silver King Peak) in your trip by descending to Pear Lake, hiking about one mine SSE and then ascending east up the very rocky and tedious slopes.