electrical bike 2021 Specialised Stumpjumper Drops Horst-Hyperlink, Devoted 27.5 fashions
With the discharge of the 2021 Stumpjumper Evo last week, Specialised signaled that it could have a revised, lesser-travel Stumpy on the way in which too. Right now it’s right here, and Specialised has performed some fascinating issues with the transform. To sum it up above floor, Specialised has switched the Stumpjumper to a Flexstay design, eliminating the pivot discovered between the chain and seat stays (on the carbon fashions) and so they have ditched devoted 27.5-inch fashions, although the brand new Stumpy, just like the Evo, is mullet-compatible.
This additionally signifies that Specialised doesn’t have any devoted 27.5-wheeled full-suspension bikes anymore. They’ve the Fatboy, a 26-inch fatbike, the Pitch, an entry-level 26-inch hardtail, and the P3, a 26-inch filth jumper. Someway, 26ers have outlasted 27.5, at the very least for the Specialised lineup. This does go away considered one of their eMTBs although; the Turbo Kenevo is a 27.5+ eMTB. We gained’t be shocked if that modifications on the subsequent spherical.
Let’s begin with the body. There are two choices; carbon and aluminum. Specialised truly did preserve the Horst Hyperlink on the aluminum frames, however carbon frames will get the Flexstay design. On the brand new carbon frames, Specialised says that they’ve shed 100g on the S4 measurement (giant). They did this partly by ditching the rear pivots, and optimizing the carbon layup all through the body, optimizing stiffness, compliance, and weight in the correct locations.
Journey on the brand new Stumpy is 140/130mm within the entrance/rear. Total, Specialised says they went with a fairly linear curve within the mid-travel bike to ensure there was as a lot usable journey as doable, nevertheless there’s a sharp rise in the long run stroke for much less harsh backside outs. “We needed to backside out, we simply didn’t wish to really feel it,” mentioned Specialised builders in a presentation concerning the bike.
To create an active-feeling suspension, Specialised went with a “very gentle” shock tune utilizing Fox DPS shocks. Builders say to not count on a agency, platform really feel, nevertheless it ought to create loads of traction. Specialised says that this pumps in additional low-speed compression with out an excessive amount of high-speed compression, and provides a pure preload. Customers can add quantity spacers if wanted.
The SWAT field caught round, and Specialised engineers expanded the room by about 20%. They saved touches just like the raised rubber chain slap guard to maintain issues quiet, together with the protecting downtube cowl.
Specialised sought a technique to convert the path bike over to 29 solely and so they managed to tug it off, and with six sizes, S1-S6, which interprets to XS-XXL. Sizing relies off of attain and wheelbase size, so riders can measurement up or down relying on how lengthy they like their bike. Slightly than selecting a motorcycle based mostly on inseam, patrons can select a motorcycle based mostly on size.
With the brand new 29er sizing, the S1 has a greater standover peak than that of the earlier 27.5 bike, which ought to reassure shorter riders. If people need much more clearance for steeper terrain, they’ll swap out the rear wheel for a 27.5, clearly not included. Specialised say they have been very assured within the transfer to larger wheels. “We’ve all the time been about 29.”
On an S3, which interprets to a measurement M, within the low place, the attain measures 450mm, the HTA is 65°, the BB peak is 333mm (additionally throughout sizes besides S1), with a 1200mm wheelbase, 744mm standover peak, and a 76° STA. For a “medium,” the standover will not be the bottom on the market. The Stumpjumper makes use of a lowered 44mm offset fork.
Just like the Stumpy Evo, the Stumpjumper’s geo is adjustable with a flip chip, altering the BB by 7mm and the HTA and STA by a half-degree.
Construct kits for the bike make it a lighter-duty path bike than the Evo, with inline Fox DPS shocks, and SRAM G2 brakes, reasonably than Codes, to not point out the lighter Flexstay as a substitute of a Horst-link. “We wish to preserve it tremendous sturdy and path worthy.”
See the Specialised website for extra info, construct kits, and pricing.