2020 YT Industries

JEFFSY Base

A 27.5″ aluminum frame full suspension enduro bike with upper mid-range components.
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MSRP$2,299
Weight31.1 lbs  
FrameAluminum
SuspensionFull, 160 / 160mm
ForkRockShox Yari RC
ShockRockShox Deluxe Select
Wheels27.5″ Aluminum
Drivetrain1 × 12
GroupsetSX Eagle
BrakesHydraulic Disc
SeatpostDropper
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Insights
Ride Feel

Based on frame geometry and build specs.

Terrain
easyextreme
Handling
nimblestable
JEFFSY Base
Other Enduro bikes
Gearing

A bike with lower gearing will be easier to ride up steep hills, while a higher top end means it will pedal faster down hills.

Lowest gear

(climbing)

24 mph

JEFFSY Base

26 mph

Similar Bikes

Highest gear

(descending)

Reviews
Beta
The Beta Tests: YT Jeffsy Core 2 29

Dec 2021 · Lydia Tanner

A great value with an appetite for rowdier trails. . 

Highs
  • Incredibly capable

  • Incredibly fun

  • Incredibly versatile

  • Incredible value

Lows
  • Pedal bob had us using the lockout on long climbs

  • Slightly limited water bottle space

  • Could use stronger brakes

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Loam Wolf
Review: YT Jeffsy 29 Core 4

Oct 2021 · Robert Johnston

The YT Jeffsy 29 Core 4 is a versatile all mountain bike that’ll happily crunch out mellower miles or tackle some tough enduro tracks.

Highs
  • Well-Rounded nature

  • Capable suspension package

  • Technical climbing prowess

Lows
  • Steeper head angle in steep terrain

  • Flimsy tires

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Mountain Bike Action
BIKE REVIEW: YT JEFFSY ALL-MOUNTAIN MACHINE - Mountain Bike Action Magazine

Aug 2021 · McCoy

The Jeffsy hits the mark for a rider who wants to go a step beyond...

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Outdoor Gear Lab
YT Jeffsy Core 3

Jun 2021 · Jeremy Benson

The Jeffsy Core 3 is the latest version of YT's popular longer travel trail bike. While other brands have gone to extremes with their geometry, this bike's...

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Bikerumor
YT Blaze give RockShox Deluxe Ultimate suspension to Izzo Jeffsy Capra

Feb 2021

YT Blaze models introduce top-end Deluxe Ultimate RockShox suspension to the Izzo trail bike, Jeffsy all-mountain bike and Capra enduro bike

Read Review

Vital MTB
2020 YT Jeffsy Base 29 Bike

Sep 2020 · Sspomer

If you can get it, GET IT.

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BIKE Magazine
Tested: YT Jeffsy Base 29

Jul 2020

At less than half the price of the previous Jeffsy 29 we tested, the YT Jeffsy Base 29 is by no means half the bike.

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BikeRadar
YT Jeffsy Base 29 review

Apr 2020 · Alex Evans

If I was spending my own money on a bike, the Jeffsy Base 29 would be at the top of my list, offering exceptional value for money with only a few small niggles

Highs
  • Stable and incredibly competent descender that’s fun to ride, easy to set up and relatively cheap to buy

Lows
  • Shifters and brake levers were impossible to get in the right place

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Geometry
99 Spokes on YouTube99 Spokes on YouTube
Specs
Build
Frame

Jeffsy Alloy 27,5" high modular alloy main frame | V4L Virtual 4-Link rear suspension | 148x12mm DT Swiss QR Thru axle | down tube/seat stay/chain stay protection

Fork

RockShox Yari RC 27,5" | 160 mm | 15QR x 110 | 46 mm Rake

Travel160mm

Spring TypeAir

Shock

RockShox Deluxe Select 230 x 65 mm

Travel160mm

Spring TypeAir

Headset

Acros AZX-576 High Cap

Stem

Race Face AEFFECT R 35 50MM LENGTH | 35MM CLAMP | 0 RISE

Handlebar

Race Face AEFFECT R 780 mm Width | 20 mm Rise | 35 mm Clamp

Saddle

SDG RDR MNT YT Custom

Seatpost

YT Postman 31.6 mm | S - M 125 mm drop / L 150 mm drop / XL - XXL 170 mm drop

TypeDropper

Pedals

included / inklusive The included pedals were not made for demanding trails or racing. That is why we also offer you quality pedals at an attractive price in the shopping cart.

Grips

ODI Elite Motion V 2.1 Lock- On

Groupset
Rear Derailleur

SRAM SX Eagle 12- Speed

Crank

SRAM SX Eagle 175 mm | 32 T | DUB

Shifters

SRAM SX Eagle 12- Speed

Cassette

SRAM PG1210 Eagle 11- 50 T | 12- Speed

Brakes

SRAM Guide T Rotor Centerline 200 mm / 180 mm

TypeHydraulic Disc

Wheels
Rims

DT Swiss M 1900 SPLINE 27,5" x 30 mm | 110 x 15 mm | 148 x 12 mm

Tires

Front: MAXXIS Minion DHR II 27,5" x 2.4 | EXO | TR, Rear: MAXXIS Minion DHR II 27,5" x 2.4 | EXO | TR

Rider Notes
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Last updated June 23
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