New YT JEFFSY Base for 2020 announced in 27.5″ and 29″ – Premium geometry at an affordable price

The current YT JEFFSY, even in the affordable COMP spec is still a dream bike for many riders. The all-new YT JEFFSY Base meets the needs of riders with around € 3,000 to spend, without dispensing the well-proven geometry features of the more expensive carbon models. Here you’ll find all the information you need, right from YT:

New YT JEFFSY Base for 2020 announced in 275 and
YT JEFFSY BASE | 160 mm o. 150 mm/150 mm (v/h) | 15,2 kg | 2.299 € | Hersteller-Link

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.

1692138121 338 New YT JEFFSY Base for 2020 announced in 275 and

“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 & Spec of the all-new JEFFSY Base

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 8 mm 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.

Geometry of the 29″ models

Sizes S M L XL XXL
Top tube 572 mm 593 mm 615 mm 638 mm 660 mm
Reach 430 mm 450 mm 470 mm 490 mm 510 mm
Stack 618 mm 622 mm 627 mm 636 mm 640 mm
Seat tube length 400 mm 415 mm 435 mm 460 mm 485 mm
Chainstay 435 mm 435 mm 435 mm 440 mm 440 mm
Head tube angle 66°/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°
BB Drop 32/24 mm 32/24 mm 32/24 mm 32/24 mm 32/24 mm
Wheelbase 1182 mm 1204 mm 1226 mm 1255 mm 1277 mm
Head tube length 100 mm 105 mm 110 mm 120 mm 125 mm
BB Height 344/352 mm 344/352 mm 344/352 mm 344/352 mm 344/352 mm
Standover Height 676 mm 684 mm 697 mm 711 mm 726 mm

Geometry of the 27,5″ models

Sizes S M L XL XXL
Top tube 567 mm 590 mm 613 mm 636 mm 660 mm
Reach 422 mm 442 mm 462 mm 482 mm 502 mm
Stack 598 mm 608 mm 617 mm 626 mm 635 mm
Seat tube length 395 mm 415 mm 435 mm 460 mm 485 mm
Chainstay 432 mm 432 mm 432 mm 437 mm 437 mm
Head tube angle 65.5°/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°
BB Drop 13/6 mm 13/6 mm 13/6 mm 13/6 mm 13/6 mm
Wheelbase 1167 mm 1191 mm 1215 mm 1244 mm 1268 mm
Head tube length 110 mm 120 mm 130 mm 140 mm 150 mm
BB Height 344/352 mm 344/352 mm 344/352 mm 344/352 mm 344/352 mm
Standover Height 676 mm 684 mm 697 mm 711 mm 726 mm

Fork RockShox Yari RC, 160 mm (27,5″)/150 mm (29″)
Rear shock RockShox Deluxe Select 150 mm
Drivetrain SRAM SX Eagle 1×12
Brakes SRAM Guide T
Wheels DT Swiss M 1900 SPLINE
Tires Maxxis Minion DHR II
Stem Race Face AEFFECT R 35
Handlebar Race Face AEFFECT R 35
Seatpost YT Postman
Price € 2,299

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.

For more information head to

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Words & Photos: YT Industries PR

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