YT Launches Alloy Jeffsy Base | A £2k Bike For Metalheads

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When YT launched its revised Jeffsy last year, it only updated the design of the carbon frame. Today, it launches the new Jeffsy Base, an alloy model with geometry and design changes to bring it into line with the existing carbon line up. Buyers will be able to choose from 27.5 or 29 in frame options, two colour options and five sizes from S to XXL. All will be available at one price: £1,999 ($2,229 USD). Read on for the full press release.

More than just a paint job – Aluminum bike updated and ready to send it

After the carbon frame ‘redefined friendship’ last year – courtesy of an advanced geometry for a longer, slacker ride – the aluminum-framed JEFFSY Base will add more excitement to riding the trails for all aluminum fans out there this year. The updated geometry based on the carbon success is accompanied with a high-tech spec. The JEFFSY Base comes in the colors Twotone Blue and Black Magic, is available with a 27.5- or 29-inch wheel size and frame sizes vary from S to XXL. The choice of wheel and frame size is not necessarily defined by body size but by riding style and personal preference. The 29er is an aggressive and agile mountain bike that will let riders conquer the most technical terrain while also getting the better of any uphill section in their path. The 27.5-inch wheel size lets JEFFSY unleash its pure gravity genes despite being an all-mountain with great climbing characteristics.

“The new JEFFSY carbon bike has been very successful and has helped YT gain a good position in the all-mountain bike market. The new geometry has been well received, so it’s a no-brainer to bring the same performance to customers that prefer to ride aluminum bikes. They can expect the same fun but aggressive riding experience and trail characteristics. The performance of the JEFFSY has been well received, but so has the appearance. We wanted to move as much of the aesthetic from the carbon model to the alloy model as possible.” – Chris Hilton, CTO YT Industries



Geometry and Specification

YT has injected the 2020 JEFFSY Base model with the same fun-loving DNA and geometry update introduced to the carbon frame in the past year. Courtesy of the new geometry and kinematics, the slacker head angle, longer reach and lower front give riders a comfortably aggressive position on the bike during technical descents and plenty of control, while the steep seat tube angle allows for great climbing characteristics. The geometry can also be adjusted thanks to the Flip Chip, which drops the BB by 8mm and results in a 0.5° slacker head and seat tube angle. This modern geometry paired with a great kit will deliver heaps of stoke on the most demanding trails the planet has to offer.

Jeffsy Base 29 Geometry

Sizes  SM  L  XL  XXL
Top tube572 mm593 mm615 mm638 mm660 mm
Reach430 mm450 mm470 mm490 mm510 mm
Stack618 mm622 mm627 mm636 mm640 mm
Seat tube length400 mm415 mm435 mm460 mm485 mm
Chainstay435 mm435 mm435 mm440 mm440 mm
Head tube angle66°/66.5°66°/66.5°66°/66.5°66°/66.5°66°/66.5°
Seat tube angle (eff)77° / 77.5°77° / 77.5°77° / 77.5°77° / 77.5°77° / 77.5°
Seat tube angle (act)70.5° / 71°70.5° / 71°70.5° / 71°70.5° / 71°70.5° / 71°
BB Drop 32 / 24 mm32 / 24 mm32 / 24 mm32 / 24 mm32 / 24 mm
Wheelbase1182 mm1204 mm1226 mm1255 mm1277 mm
Head tube length100 mm105 mm110 mm120 mm125 mm
BB Height344 / 352 mm344 / 352 mm344 / 352 mm344 / 352 mm344 / 352 mm
Standover Height676 mm684 mm697 mm711 mm726 mm
Jeffsy Base 29 Geometry

Jeffsy Base 27.5 Geometry

Sizes  SM  L  XL  XXL
Top tube567 mm590 mm613 mm636 mm660 mm
Reach422 mm442 mm462 mm482 mm502 mm
Stack598 mm608 mm617 mm626 mm635 mm
Seat tube length395 mm415 mm435 mm460 mm485 mm
Chainstay432 mm432 mm432 mm437 mm437 mm
Head tube angle65.5°/66°65.5°/66°65.5°/66°65.5°/66°65.5°/66°
Seat tube angle (eff)76.5.° / 77°76.5.° / 77°76.5.° / 77°76.5.° / 77°76.5.° / 77°
Seat tube angle (act)70.5° / 71°70.5° / 71°70.5° / 71°70.5° / 71°70.5° / 71°
BB Drop 13 / 6 mm13 / 6 mm13 / 6 mm13 / 6 mm13 / 6 mm
Wheelbase1167 mm1191 mm1215 mm1244 mm1268 mm
Head tube length110 mm120 mm130 mm140 mm150 mm
BB Height344 / 352 mm344 / 352 mm344 / 352 mm344 / 352 mm344 / 352 mm
Standover Height676 mm684 mm697 mm711 mm726 mm
Jeffsy Base Geometry (27.5in)

Both the 27.5- and 29-inch Base model are specced with a RockShox Yari RC with 160 mm / 150 mm of front travel respectively; that means 10 mm more front travel! The rear suspension is set up with the RockShox Deluxe Select shock. The JEFFSY Base comes with a 1×12 drivetrain by SRAM and a DT Swiss M1900 wheel and MAXXIS Minion DHR II tire combination. The Thirstmaster 4000, a 600 ml FIDLOCK bottle, fits in the frame snugly and will ensure you always stay hydrated. Additionally, maintenance and servicing have become easier, thanks to the ‘single sided hardware access’ enabling the suspension linkage and rear triangle hardware to be installed and removed from the same side. The ‘race-specific advanced sealing concept’ and ‘axial-lip-seal’ prolong the service life of the new aluminum JEFFSY, thanks to additional seals that protect the double-sealed full complement bearings and keep water and dirt at bay.

The claimed weights for a size large are 15.3kg for a Base 29, and 15.2kg for a 27.5in model.

There’s no word yet of any cinematic wonder of a video release to go with it. We live in hope… something a bit Spinal Tap maybe? Turn it up to 11, throw your Thirstmaster 4000 at the stage, and party. At less than £2k, you’ll have money left over for a commemorative T-shirt.

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