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Bike Perfect
Specialized grants rider's wishes with the release of an alloy Stumpjumper 15 featuring its Genie shock tech and good old mechanical shifter routing
By Graham Cottingham,
21 hours ago
Specialized has announced a more affordable alloy Stumpjumper 15, the metal tubed frame shares numerous features of the existing carbon model and comes with three shock options.
Specialized released the latest edition of its best trail bike back in July, the new Stumpjumper 15 featured tweaked geometry, more travel, and new shock tech that Specialized has dubbed Genie. In his Specialized Stumpjumper review , Guy Kesteven said the "new version is the most awesome Stumpy ever".
Now Specialized has launched a new M5 alloy version that comes with mechanical groupset compatibility, SWAT door downtube storage, geometry adjustments, and Specialized's new Genie shock technology.
The new Genie shock is claimed to give "16.3 percent better bump force management and 39 percent fewer severe bottom-outs compared to a standard air-sprung shock" – according to Specialized. It uses a two-stage air shock with a large volume chamber offering linear action through the initial shock stroke, before transitioning to a small air chamber to ramp up progression to resist bottom-out forces.
The alloy Stumpjumper 15 shares the same geometry as the carbon bikes and features several geometry adjustments to tweak the ride feel. An eccentric headset cup adjusts the head angle between 63, 64.5, and 65.5 degrees. The bottom bracket height can also be altered from 337mm to 330mm via a flip-chip in the Horst suspension link. There are six frame sizes with S1 and S2 frame sizes with a 27.5in rear, wheel while larger bikes are 29in front and rear. The smaller three frame sizes are equipped with 165mm cranks and the larger three have 170mm cranks. Chainstay lengths are size-specific and vary from the S1's 430mm up to the 445m of the S5 and S6.
Specialized will offer the Stumpjumper 15 Alloy in three builds and as a standalone frameset. The Stumpjumper 15 Comp Alloy and Stumpjumper 15 frameset comes with the Genie shock, the Stumpjumper 15 Fox Coil Alloy, you guessed it, comes with a Fox DHX Factory coil shock, and the base model Stumpjumper 15 Alloy gets a standard air shock from X-Fusion.
The carbon-framed Stumpjumper 15s caused some controversy because the frames don't have routing for a cabled shifter – all the models have wireless versions. However, the alloy Stumpys have the required plumbing whether they come with a conventional shifter or not.
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