Trek Session 88
Trek recently revised its downhill oriented Session 88 bike for 2009, with a revised suspension. This single model replaces last years DH and FR models, which were basically the same bike with slightly differing components.
Trek uses off-the-shelf suspension components which are thoroughly tested and adjusted to fit each model: this really shows with the 88s custom-valved Fox 40 Fit RC2 front fork. At the rear is Treks active braking pivot swing arm, combining the strength of a four-bar suspension with the axle path of a low single pivot. This provides excellent feedback from the suspension, even at mid-stroke. However, what really makes this design stand out from other bikes is Treks isolation of the brake from the suspension, preventing brake jacking. Bump absorbing duty is done by a Fox DHX RC-4 shock. Both the front and rear have 8 inches (203mm) of travel, and can handle drops as much as ten feet with little drama.
Thanks to its hydro-formed aluminum frame, the 88 weighs only 38lbs, while other downhill bikes are typically around 45lbs. This does make the bike easier to move and steer, and it makes a huge difference in making jumps. However, in a category so dependent on frame strength, there is always the question of how long a bike this light will last: the frame warranty is only for three years.
To fit its role as a downhill bike, the Session 88 has a long wheel base and 65 degree fork angle, which results in a very stable ride on rough trails, especially around curves. However, this length makes it difficult to ride at slow speeds on technical trails -- not an uncommon problem for downhill bikes in general. Seat movement is limited, and has a steep angle which may put it too far back for some riders. The 88 has Shimanos Saint 170mm crank, which can get in the way in low clearance areas; riders may want to switch it out for something a little smaller. Fortunately, the bash guard is very sturdy and should protect against most hits.
The other Saint components on the old Session have been replaced for 2009 by a nine speed gear cassette, X.0 shifter, and compact derailleur sourced from SRAM. Trek claims their new swing arm prevents chain float no matter how much the suspension moves. Riders will appreciate the Avid Elixir CR MAG hydraulic disc brakes, which provide excellent modulation and little fade, needing only a light single-finger pull in all but extreme circumstances.
Price for a complete Session 88 is around $6,000, while bare frames are also available.
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