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2018 YT Industries

Jeffsy 27 AL

A 27.5″ aluminum frame full suspension enduro bike with upper mid-range components.
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Manufacturer Price

$2,299
Weight30.2 lbs  
FrameAluminum
SuspensionFull, 150 / 150mm
ForkFox Rhythm Float 34
ShockFox Float DPS Performance
Wheels27.5″ Aluminum
Drivetrain1 × 11
GroupsetSLX
BrakesSRAM Guide R Hydraulic Disc
SeatpostDropper
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Insights
Ride Feel

Based on frame geometry and build specs.

Terrain
easyextreme
Handling
nimblestable
Jeffsy 27 AL
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)

29 mph

Jeffsy 27 AL

26 mph

Similar Bikes

Highest gear

(descending)

Reviews

Summary

The YT Industries Jeffsy is a trail bike that excels in aggressive descending and technical climbs, thanks to its Virtual 4 Link suspension and adjustable geometry. It offers excellent value with its consumer-direct business model, though some builds may feel twitchy at high speeds or limited in suspension travel. The bike is frequently praised for its fun factor and versatility on a variety of trails.

Pros
  • Consumer-direct business model keeps prices significantly lower

  • Virtual 4 Link suspension provides excellent small-bump sensitivity and mid-stroke support

  • Ideal geometry for aggressive descending with adjustable angles

  • Snappy and agile yet stable on technical uphill sections and high-speed descents

Cons
  • Frame can’t accept traditional water bottles

  • Some builds may feel twitchy at higher speeds

  • Limited suspension travel on rougher terrain

Key Quotes
if this was the $4,600 version, how could the flagship CF Pro ride any better?
BIKE Magazine logoBIKE Magazine
Fast, agile, feedback-rich and top value, but its short travel and uptight geometry are frustrating
BikeRadar logoBikeRadar
The YT Jeffsy is a ripper of a bike.
Flow Mountain Bike logoFlow Mountain Bike

Feedback?

View all reviews

Enduro Mountainbike Magazine
YT JEFFSY 27 AL Base in review

May 2019 · Christoph Bayer

The new JEFFSY has caused quite a sensation. However, for this group test, we had last year's YT JEFFSY 27 AL. Can the bike still deliver?

Highs
  • Very composed on rough trails

  • Excellent rear suspension

  • Good value for money

Lows
  • Sluggish climber

  • Underpowered brakes in steep terrain

  • A bit cumbersome on flat trails

Read Review

BIKE Magazine
The New 2019 YT Jeffsy 27 and 29

Jan 2019

The Jeffsy MK2 got a lot more than a minor facelift—re-worked geometry, updated suspension kinematics and plenty of smart design features abound.

Read Review

NSMB
Introducing the 2019 YT Jeffsy MK II (Ridden in Portugal)

Jan 2019

The new Jeffsy gets more travel in both wheel sizes, a better pedalling platform, longer reach, shorter offset and of course Christopher Walken...

Read Review

BikeRadar
YT Industries Jeffsy 29 AL review

Dec 2018 · Guy Kesteven

Fast, agile, feedback-rich and top value, but its short travel and uptight geometry are frustrating. Buy if you want a fast, agile alloy trail bike

Highs
  • Outstanding spec for the money

  • Naturally fast, involving and enjoyable ride

  • Well-balanced suspension feel

Lows
  • Grumbly cassette and limited seatpost adjustment

  • Tall position and short reach and wheelbase mean it can feel twitchy at higher speeds

Read Review

Flow Mountain Bike
Video: Our YT Jeffsy Custom Build

May 2018

The YT Jeffsy is a ripper of a bike. It’s hard to explain why; when you look at it on paper there’s nothing particularly magical about its numbers or suspension. But on the trails, it flat out shreds, down, up and round the bends. We fell in love with this bike last year, when we …

Read Review

Singletrack World
Review: The £2199 YT Jeffsy AL One 29 Is One Of The Best Value Trail Bikes We've Ever Tested

Jan 2018 · Barney Marsh

The build kit on this bike is insanely good for the money

Read Review

Loam Wolf
Review: YT Jeffsy CF Pro 27.5

Dec 2017 · Drew Barber

Priced right and packing good looks, the YT Jeffsy is a tempting buy. But how does the Jeffsy star up on the trail or against its 29" brother?

Read Review

MBR
YT Industries Jeffsy CF Pro Race 27 (2017) review - MBR

Aug 2017 · Alan Muldoon

The Jeffsy CF Pro Race 27 takes the stock 27 platform and pumps the travel up to 160mm. It’s something of a lone wolf within the Jeffsy 27 range.

Highs
  • Light, fast and dressed to impress.

Lows
  • Takes the Fox 34 to the limit.

Read Review

Geometry
Specs
Build
Frame

Aluminum

BB StandardBB86/BB92, Press Fit

Fork

FOX 34 Float Rhythm, 44mm rake, Boost

Travel150mm

Spring TypeAir

Shock

FOX DPS Performance, 230mm x 60mm

Travel150mm

Bottom Bracket

Race Face BB92

Headset

Acros AZX-203

Stem

Race Face Aeffect R, 50mm length

Handlebar

Race Face Aeffect R 35, 20mm rise, 780mm width

Saddle

SDG Fly MTN, teal, YT custom

Seatpost

e*thirteen TRS+, 125mm or 150mm drop

TypeDropper

Pedals

None included

Grips

SDG Slater

Groupset
Rear Derailleur

Shimano SLX Shadow Plus

Front Derailleur

N/A

Crank

Race Face Aeffect SL, 175mm length, Boost

Shifters

Shimano SLX, 11-speed

Cassette

e*thirteen TRS+, 9-46 tooth, 11-speed

Chain

Shimano CN-HG601-11

Chain Guide

N/A

Brakes

SRAM Guide R

TypeSRAM Guide R Hydraulic Disc

Brake Levers

SRAM Guide R

Wheels
Rims

DT Swiss M 1900 Spline, 30mm width

Front Hub

DT Swiss M 1900 Spline, Front: 15mm x 110mm, Rear: 12mm x 148mm

Rear Hub

DT Swiss M 1900 Spline, Front: 15mm x 110mm, Rear: 12mm x 148mm

Tires

Front: Maxxis High Roller II, 2.40" 3C MaxxTerra EXO, Rear: Maxxis High Roller II, 2.40" MaxxPro EXO

Rider Notes
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First added April 14

Last updated April 14

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