2020 YT Industries

JEFFSY PRIMUS JP 26

A 26″ aluminum frame mountain youth bike with upper mid-range components and hydraulic disc brakes.
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MSRP$1,999
Weight30.6 lbs  
FrameAluminum
SuspensionFull, 140 / 140mm
ForkManitou Machete
ShockRockShox Deluxe Select+
Wheels26″ Aluminum
Drivetrain1 × 12
GroupsetSX Eagle
BrakesHydraulic Disc
SeatpostDropper
Where to Buy
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Insights
Ride Feel

Based on frame geometry and build specs.

Handling
nimblestable
JEFFSY PRIMUS JP 26
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)

21 mph

JEFFSY PRIMUS JP 26

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

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

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Vital MTB
2020 YT Jeffsy Base 29 Bike

Sep 2020 · Sspomer

If you can get it, GET IT.

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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

Read Review

Geometry
99 Spokes on YouTube99 Spokes on YouTube
Specs
Build
Frame

Aluminum

Fork

MANITOU Machete 26" | 140 mm | 15x100 mm

Travel140mm

Spring TypeAir

Shock

RockShox Deluxe Select+ 190x45 mm

Travel140mm

Spring TypeAir

Headset

Acros AZX-576 High Cap

Stem

E13 Base 40 mm

Handlebar

E13 Base 20 mm Rise | 760 mm Width

Saddle

SDG RDR MNT YT Custom

Seatpost

YT Postman 31.6 mm | 100 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 165 mm | 30 T | DUB

Shifters

SRAM SX Eagle 12 - Speed

Cassette

SRAM PG1210 Eagle 11- 50 T | 12- Speed

Brakes

SRAM Guide R Custom 2 Piston Caliper | Rotor CENTERLINE 180 mm / 180 mm

TypeHydraulic Disc

Wheels
Rims

SUNringlé DUROC 26" x 30 mm | 100 x 15 mm | 148 x 12 mm

Tires

Front: MAXXIS Minion DHR II 3C MaxxTerra 26" x 2.4 | EXO | TR, Rear: MAXXIS Minion DHR II Dual Compound 26" x 2.3 | EXO | TR

Rider Notes
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Last updated August 5
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