YT Industries Jeffsy Primus 27

Name: YT Industries Jeffsy Primus 27
Brand: YT Industries

2024 YouthMountain youth Manufacturer page

YT Industries Jeffsy Primus 27, color Nox Blue

Last known price: $2,399

Prices shown first for United States
Travel: 150 / 150 mm Fork / rear shock
Wheels: 27.5″
Drivetrain: 1 × 12 32t / 11–50t
Gear range: 455%
Weight: 15.3 kg 33.7 lb · Reference configuration not specified
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

One Size 154–165

Components

15 of 15 identified

Parts found in a manufacturer catalog show their brand, model and key numbers, and the steps show how precisely they are identified: brand, series, model, or the exact product. The info button has every detail and the text the manufacturer published.

Suspension

2 parts

Drivetrain

4 parts

Brakes

1 part

Brakes
- SRAM G2

Wheels and tires

2 parts

Cockpit and contact points

6 parts

Sizes and geometry

1 size Open in the geometry plotter

Enter your height to highlight matching ranges.

Size One Size

Table

Reach 422mm

Stack 598mm

Wheelbase 1167mm

Head angle 65.7°

Seat angle 76.4°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 27.5″ wheel; exact published values are in the table below.

Size Reported by the manufacturer

Complete manufacturer geometry table 1 published size

Complete manufacturer geometry by size
Measurement
Reachmm	422
Stackmm	598
Top tube lengthmm	567
Seat tube lengthmm	395
Head tube lengthmm	110
Head tube angle	65.7°
Seat tube angle	76.4°
Chainstay lengthmm	432
Wheelbasemm	1167
Front centermm	735
Bottom bracket dropmm	6
Bottom bracket heightmm	352
Fork rakemm	42
Stack/reach ratio	1.42

Not published by the manufacturer: Standover height, Trail, Front travel, Rear travel, Crank length, Handlebar width, Stem length, Stem angle, Seatpost length and Dropper post travel.

Specifications

Frame and fork

Intended fit: Unisex
Frame material: Aluminum
Bicycle weight: 15.3 kg

33.7 lb

Suspension

Suspension configuration: Full suspension
Front travel: 150 mm
Rear travel: 150 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 32
Largest chainring: 32
Rear sprockets: 12
Smallest sprocket: 11
Largest sprocket: 50
Lowest gear: 17.6 in
Highest gear: 80.0 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Dropper seatpost
Shifting: Mechanical

Additional specifications

Fork spring: Air
Tire width: 2.4″
Wheel material: Aluminum
Wheel size: 27.5″

Technical analysis

3 measures

How these figures sit among bicycles of the same class and model year. Context, not a ranking.

Lowest gear

17.6 gear inches

This value is within the central range for this class.

Cohort: Youth / Mountain youth Model year: 2024
Sample: 301 bicycles with this information
Coverage: 79.4% of the class

Highest gear

80.0 gear inches

This value is above the central range for this class.

Cohort: Youth / Mountain youth Model year: 2024
Sample: 301 bicycles with this information
Coverage: 79.4% of the class

Shifting

Mechanical

14 of 379 bicycles with this information use electronic shifting.

Cohort: Youth / Mountain youth Model year: 2024
Sample: 379 bicycles with this information
Coverage: 100.0% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 6.7 km/h
Highest gear: 30.6 km/h

Total gear range 455%

Technical details and class reference

These speeds describe the gearing at the selected cadence, not how fast you can ride.
Calculated from published gear-inch values and their wheel-size assumptions.
These gearing values describe the bicycle, not a selected frame size.
A 100% range means one ratio; 500% means the highest ratio is five times the lowest.
For e-bikes, motor assistance cutoff is not represented.

Gear-inch range

Lower gear-inch values travel less distance per pedal revolution; higher values travel farther.

This bicycle: 17.6–80.0 gear inches
Class reference (p10–p90): 14.1–78.0 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Youth / Mountain youth Model year: 2024
Lowest gear: 301 bicycles with this information, 79.4% of the class
Highest gear: 301 bicycles with this information, 79.4% of the class

Lineup changes

The published facts that differ across this family's builds and from the same model a year earlier. Missing information never counts as zero.

Differences across 2024 builds
Specification	This bicycle YT Industries Jeffsy Primus 27	YT Industries Jeffsy Core 1 27	YT Industries Jeffsy Core 1 29	YT Industries Jeffsy Core 1 MX	YT Industries Jeffsy Core 2 29	YT Industries Jeffsy Core 3 29
Frame
Frame material	Aluminum	Aluminum	Aluminum	Aluminum	Aluminum	Carbon
Bicycle weight	15.3 kg	14.6 kg	16 kg	14.6 kg	15.5 kg	14.9 kg
Suspension
Rear travel	150 mm	145 mm	145 mm	145 mm	145 mm	145 mm
Drivetrain
Smallest sprocket	11	11	11	11	10	10
Largest sprocket	50	50	50	50	52	52
Lowest gear	17.6 in	17.6 in	18.6 in	17.6 in	17.9 in	17.9 in
Highest gear	80.0 in	80.0 in	84.4 in	80.0 in	92.8 in	92.8 in
Wheels
Wheel configuration	Same size	Same size	Same size	Different sizes	Same size	Same size
Other specifications
Fork spring	Air	Not informed	Air	Not informed	Air	Air
Tire width	2.4″	2.4″	Not informed	2.4″	Not informed	Not informed
Wheel size	27.5″	27.5″	29″	29″ / 27.5″	29″	29″
Bottom bracket standard	Not informed	BB86/BB92	BSA	BB86/BB92	BSA	BB86/BB92