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Tech feature: Specialized 2008 MTB lineup Part I, July 3, 2007
Specialized brings the integrated approach to iconic Stumpjumper
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Specialized's current S-Works Stumpjumper FSR Carbon has only been on the market for a short two years, but the company has already decided to launch an all-new, and dramatically revamped, version for 2008. Cyclingnews Tech Editor James Huang continues to brush up on his Spanish while taking a look at the new Stumpy and other gems in the new Specialized lineup.
Good ideas for product innovations apparently trump traditional fiscal responsibilities in the halls of Specialized's Morgan Hill, CA, headquarters. After an exceptionally short two-year reign, the S-Works Stumpjumper FSR Carbon will be replaced for 2008 with an all-new version that promises to be stiffer, faster, and a lot lighter than the bike we've come to know and love.
At first glance, the new Stumpjumper Carbon frame looks almost like a downsized Enduro with a similarly low-slung profile for greater standover clearance, an S-shaped down tube to provide room for a bottle cage, and a new rocker link-type rear suspension configuration that allows for a more refined axle path and nearly completely uninterrupted seat tube for a greater range of seatpost adjustment.
Relative to last year's version, the down tube is also oversized throughout its serpentine length and the top tube is noticeably wider and flatter for improved torsional rigidity. An all-new rear end now incorporates a carbon fiber seatstay assembly (with a carbon fiber driveside dropout and trick forged and bonded aluminum one on the non-driveside), a lighter mount on the chainstay for the remote Brain, and cleaner routing for the corresponding hydraulic line.
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The new Stumpjumper retains its trail bike status with 120mm of travel front and rear, but the 'Total Suspension Integration' theme of last year's Enduro has now been taken one step further. After the recent news that Fox Racing Shox would not offer its Terralogic fork line for 2008 (you can draw your own conclusions), it should come as no surprise that Specialized has integrated its terrain-sensing FlowControl Brain damper into an all-new single-crown fork dubbed the FutureShock S120 that Specialized claims delivers perfectly matched suspension performance front to rear. As with the rear shock, external adjustments include air spring preload, rebound damping, and Brain Fade to fine-tune the overall plushness.
The 'Buddy System' packs that new damper and air spring (which is carefully sized to yield a nearly identical spring curve as the AFR rear shock) into a single 32mm aluminum stanchion to eliminate internal hardware redundancies. The other leg is completely empty save for some lubricating goo. Cast magnesium lowers use post mount-style disc tabs and massive dropouts mate with 28mm-diameter end caps on a new Roval wheelset for extra stiffness (the fork is still compatible with any standard front hub).
All of that sounds impressive enough, but don't bother entertaining any ideas of using the S120 on your current rig as the new fork also utilizes a new one-piece carbon fiber crown and steerer with 1 ⅛"-to-1 ½" tapered and oversized dimensions similar to the new Tarmac SL2. Naturally, the steerer's proprietary dimensions are matched to a similarly specific head tube on the new frame.
The new frame's head tube can accept standard forks when combined with an adapter for the lower cup, but the S120 fork can obviously only be matched to one frame option. Why would anyone go to such extremes, you ask? As with any such integrated system these days, Specialized claims the benefits of lighter weight, increased stiffness, and additional strength far outweigh the inconvenience of being locked into what it feels is a superior system, anyway. Claimed weight for the fork is an extraordinarily light 1450g, and Specialized engineer Brandon Sloan claims the S120 is the "lightest and stiffest fork we've tested so far."
Likewise, the new frame sheds 200g from last year's already-light S-Works Carbon version for a claimed sub-2kg figure and Specialized also says the combined frameset package even offers 15% greater steering precision to boot owing to the larger front end.. Complete bikes (sans pedals, of course) are said to weigh just 10.4kg (23.3lb) straight out of the box, easily landing it in elite company as one of the lightest mass-produced trail bike on the market (Gary Fisher's Carbon HiFi is another notable member).
To read Part II of the Specialized 2008 MTB lineup, click here.
Photography
For a thumbnail gallery of these images, click here
Images by James Huang/Cyclingnews.com
- Specialized drastically revamps the S-Works Stumpjumper Carbon for 2008.
- The new Stumpjumper bears a closer resemblance to the current Enduro Carbon than the outgoing Stumpy.
- The new frame bears a distinctly low-slung profile for significantly enhanced standover clearance.
- A curved down tube offers more fork crown clearance while also making room for a conventional water bottle cage.
- Carbon fiber seat stays help shave weight from the new chassis.
- The down tube is larger in diameter throughout its length , including at the bottom bracket where it now spans the full width of the shell.
- A new rocker link futher refines the axle path of the new FSR linkage.
- Carbon fiber substitutes for aluminum in the new seat stay assembly.
- The driveside dropout is also carbon fiber and retains a replaceable derailleur hanger.
- The non-driveside dropout is forged aluminum for adequate heat transfer from the brake caliper.
- The externally-bonded dropout is specially shaped to maximize bond strength and adhesive integrity during construction.
- The oversized and tapered carbon head tube…
- …houses a similarly oversized and tapered steerer tube on the new FutureShock S120 fork.
- The inflated dimensions allow for greater surface contact between the head tube and down tube, and the larger tube dimensions stiffen up the front end.
- As on the new Tarmac SL2 , the lower headset bearing is moved 12mm higher up in the head tube to transfer loads directly into the well-supported wall of the down tube.
- The new lower headset bearing dwarfs the "oversized" 1 1/8" unit.
- A higher volume air can provides a more linear spring rate.
- The outside of the Brain housing has been milled down a bit to shave a few grams.
- The top of the carbon fiber seat tube incorporates a small bit of bonded aluminum to prevent damage from the seat collar.
- The remote Brain unit now fastens to a cleaner and lighter mount on the chain stay.
- The hose for the remote Brain takes a cleaner path along the chain stay.
- The Direct Mount Derailleur system allows the front derailleur to track the chain as the suspension moves through its travel.
- As expected, the S-Works bike features a premium spec.
- Last year's FutureShock E150 dual-crown fork now receives a single-crown little brother, the S120.
- The FutureShock S120 fork marks the first time a carbon fiber crown and steerer has been used on a longer-travel trail bike fork.
- The 1 1/2" lower steerer tube dimension allows the carbon fibers to take a straighter path for improved strength and stiffness, plus lighter weight.
- The sealed bottom on the new crown is more structurally sound than conventional construction and also is sealed from dirt.
- The damper and air spring are both housed within the driveside stanchion. The only thing in the other side of the fork is some lubrication to keep things running smoothly.
- With no internals on the non-driveside , the top of the crown can simply be sealed off.
- Knobs are machined and anodized aluminum.
- The new S120 fork utilizes post mount-style tabs for the disc brake caliper.
- A truss-style construction on the rear of the brace keeps things light and stiff.
- Dropouts boast a large surface area…
- …to mate with the 28mm-diameter ends of the new Roval Controle wheelset.
