YT Industries Jeffsy Primus

Name: YT Industries Jeffsy Primus
Brand: YT Industries

2021 YouthMountain youth Manufacturer page

YT Industries Jeffsy Primus, color Black Magic

Last known price: $1,899

Prices shown first for United States
Travel: 130 / 130 mm Fork / rear shock
Wheels: 24″
Drivetrain: 1 × 11 30t / 11–42t
Gear range: 382%
Weight: 12.7 kg 28.0 lb · Reference configuration not specified
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

One Size 135–150

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

Fork
- Manitou
Rear shock
- Manitou

Drivetrain

4 parts

Cassette
- SRAM PG-1130 11 speeds 11–42t
PG-1130
Crankset
- SRAM X1 30t
Rear derailleur
- SRAM NX
Shifters
- SRAM NX

Brakes

1 part

Brakes
- SRAM Guide R

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 370mm

Stack 509mm

Wheelbase 1045mm

Head angle 65.5°

Seat angle 76.2°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 24″ 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	370
Stackmm	509
Top tube lengthmm	495
Seat tube lengthmm	315
Head tube lengthmm	95
Head tube angle	65.5°
Seat tube angle	76.2°
Chainstay lengthmm	395
Wheelbasemm	1045
Front centermm	650
Bottom bracket dropmm	12
Bottom bracket heightmm	324
Fork rakemm	49
Stack/reach ratio	1.38

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: 12.7 kg

28.0 lb

Suspension

Suspension configuration: Full suspension
Front travel: 130 mm
Rear travel: 130 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 30
Largest chainring: 30
Rear sprockets: 11
Smallest sprocket: 11
Largest sprocket: 42
Lowest gear: 17.1 in
Highest gear: 65.5 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Fork spring: Air
Wheel material: Aluminum
Wheel size: 24″

Technical analysis

2 measures

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

Lowest gear

17.1 gear inches

This value is within the central range for this class.

Cohort: Youth / Mountain youth Model year: 2021
Sample: 230 bicycles with this information
Coverage: 72.3% of the class

Highest gear

65.5 gear inches

This value is within the central range for this class.

Cohort: Youth / Mountain youth Model year: 2021
Sample: 230 bicycles with this information
Coverage: 72.3% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 6.6 km/h
Highest gear: 25.1 km/h

Total gear range 382%

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: 17.1–65.5 gear inches
Class reference (p10–p90): 15.6–80.0 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Youth / Mountain youth Model year: 2021
Lowest gear: 230 bicycles with this information, 72.3% of the class
Highest gear: 230 bicycles with this information, 72.3% 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 2021 builds

Differences across 2021 builds
Specification	This bicycle YT Industries Jeffsy Primus	YT Industries Jeffsy Base	YT Industries Jeffsy Base 29	YT Industries Jeffsy Blaze 29	YT Industries Jeffsy Comp	YT Industries Jeffsy Comp 29
Frame
Frame material	Aluminum	Aluminum	Aluminum	Carbon	Carbon	Carbon
Bicycle weight	12.7 kg	14.1 kg	14.2 kg	14.2 kg	13.8 kg	13.9 kg
Suspension
Front travel	130 mm	160 mm	150 mm	150 mm	160 mm	150 mm
Drivetrain
Smallest chainring	30	32	32	32	32	32
Largest chainring	30	32	32	32	32	32
Rear sprockets	11	12	12	12	12	12
Smallest sprocket	11	11	11	10	11	11
Largest sprocket	42	50	50	52	50	50
Lowest gear	17.1 in	17.6 in	18.6 in	17.9 in	17.6 in	18.6 in
Highest gear	65.5 in	80.0 in	84.4 in	92.8 in	80.0 in	84.4 in
Cockpit
Seatpost	Rigid seatpost	Dropper seatpost	Dropper seatpost	Dropper seatpost	Dropper seatpost	Dropper seatpost
Other specifications
Rear travel	130 mm	160 mm	150 mm	150 mm	160 mm	150 mm
Wheel size	24″	27.5″	29″	29″	27.5″	29″
Tire width	Not informed	2.4″	2.4″	2.5″	2.4″	2.4″