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2020 YT Industries

JEFFSY PRIMUS JP 24

A 24″ aluminum frame mountain youth bike with high-end components and sram guide r hydraulic disc brakes.
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Manufacturer Price

$1,899
Weight27.1 lbs  
FrameAluminum
SuspensionFull, 130 / 130mm
ForkManitou Machete JUNIT
ShockManitou
Wheels24″ Aluminum
Drivetrain1 × 11
GroupsetX1, NX
BrakesSRAM Guide R Hydraulic Disc
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Insights
Ride Feel

Based on frame geometry and build specs.

Handling
nimblestable
JEFFSY PRIMUS JP 24
Other Mountain Youth 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)

19 mph

JEFFSY PRIMUS JP 24

Highest gear

(descending)

Reviews

Summary

The YT Industries Jeffsy is a highly capable and versatile enduro bike, praised for its gravity-hungry nature, fast and confident riding, and exceptional value. It excels in descents with stable and predictable handling, while its suspension offers great traction and support. However, it faces some criticism for pedal bob on climbs and limited water bottle space.

Pros
  • Incredibly capable and fun

  • Exceptional value

  • Stable and confident descender

  • Great suspension performance

  • Versatile for various terrains

Cons
  • Pedal bob on long climbs

  • Limited water bottle space

  • Somewhat heavy

  • Underpowered brakes on some models

  • Press-fit bottom bracket issues

Key Quotes
The YT Jeffsy turned our usual value conversation on its head.
Beta logoBeta
With the YT Jeffsy Base 29, you get an incredibly capable bike at an exceptional value.
BIKE Magazine logoBIKE Magazine
The Jeffsy is an inimitable trail boss of a bike
NSMB logoNSMB

Feedback?

View all 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

Read Review

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

Read Review

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...

Highs
  • Excellent value

  • Great build for the price

  • Composed and confident descender

  • Super quiet

  • Well-rounded performance

Lows
  • A little heavy

  • Not the fastest climber

  • Geometry feels a touch dated

  • Limited water bottle space

Read Review

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

Feb 2021 · Jessie-May Morgan

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

Enduro Mountainbike Magazine
Reviewing the YT JEFFSY PRIMUS JP 24 – a full susser for ambitious baby shredders

Dec 2020 · Sven Günzel

“Come on kids, get ready and pack your stuff, today we’re heading to the mountains! We’ll hike all day and drink a big glass of fresh buttermilk at the top!" Sound familiar? Yeah, great memories, but times have changed and modern kids have a totally different idea of fun. The YT JEFFSY PRIMUS JP 24 delivered tons of it on our last family outing.

Highs
  • Outstanding chassis tuning

  • Child-specific contact points

  • Fuuuuuuuun factor

Lows
  • No dropper post

  • Relatively heavy

  • Not ideal for long rides

Read Review

Vital MTB
2020 YT Jeffsy Base 29 Bike

Sep 2020 · Sspomer

If you can get it, GET IT.

Read Review

NSMB
REVIEW: YT Jeffsy CF Pro Race 29

Jun 2020

YT's bruiser of a trail bike blurs enduro lines

Read Review

Geometry
Specs
Build
Fork

MANITOU Machete JUNIT 24" | 130 mm | 15x110 mm | 42 mm Rake

Travel130mm

Shock

MANITOU McLeod 190x40 mm

Travel130mm

Headset

Acros AZX-576 High Cap

Stem

SDG Jr 45 mm

Handlebar

SDG Slater 20 mm Rise | 650 mm Width

Saddle

SDG Fly Jr YT Custom

Seatpost

SDG Jr 31.6 mm | 8 mm Offset | +/- 13 ° Rise | Alloy

TypeRigid

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

SDG Slater Jr

Groupset
Rear Derailleur

SRAM NX 11 - Speed

Crank

SRAM X1 Eagle 155 mm | 30 T | DUB

Shifters

SRAM NX 11 - Speed

Cassette

SRAM PG1130 11 - 42T | 11-Speed

Brakes

SRAM Guide R Custom 2 Piston Caliper | Rotor CENTERLINE 160 mm / 160 mm

TypeSRAM Guide R Hydraulic Disc

Wheels
Rims

SUNringlé DUROC 24" x 30 mm | 110 x 15 mm | 148 x 12 mm

Tires

Front: MAXXIS Minion DHF MaxxTerra 24" x 2.4 | EXO | TR, Rear: MAXXIS Minion DHR II Dual Compound 24" x 2.3 | EXO | TR

Rider Notes
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First added February 14

Last updated August 5

Not listed for 2,132 days