YT Industries Jeffsy Core 1 27

Name: YT Industries Jeffsy Core 1 27
Brand: YT Industries

2024 MountainTrail Manufacturer page

YT Industries Jeffsy Core 1 27, color Trooper White

Travel: 150 / 145 mm Fork / rear shock
Wheels: 27.5″
Drivetrain: 1 × 12 32t / 11–50t
Gear range: 455%
Weight: 14.6 kg 32.2 lb · Reference configuration not specified
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

SM 153–166
MD 162–176
LG 172–185
XL 181–194
XXL 190–203

Components

16 of 16 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

5 parts

Brakes

1 part

Brakes
- SRAM G2

Wheels and tires

2 parts

Cockpit and contact points

6 parts

Sizes and geometry

5 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size LG

Table

Reach 481mm

Stack 622mm

Wheelbase 1236mm

Head angle 65.6°

Seat angle 78.5°

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 5 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	442	462	481	501	521
Stackmm	608	615	622	629	636
Top tube lengthmm	562	585	607	630	652
Seat tube lengthmm	385	410	435	460	485
Head tube lengthmm	100	108	116	124	132
Head tube angle	65.6°	65.6°	65.6°	65.6°	65.6°
Seat tube angle	77.5°	78.1°	78.5°	78.9°	79.2°
Chainstay lengthmm	435	435	435	440	440
Wheelbasemm	1189	1213	1236	1265	1288
Front centermm	755	779	802	826	849
Bottom bracket dropmm	25	25	25	25	25
Bottom bracket heightmm	351	351	351	351	351
Standover heightmm	738	736	740	746	750
Fork rakemm	44	45	45	46	46
Trailmm	113	112	112	111	111
Stack/reach ratio	1.38	1.33	1.29	1.26	1.22

Not published by the manufacturer: 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: 14.6 kg

32.2 lb

Suspension

Suspension configuration: Full suspension
Front travel: 150 mm
Rear travel: 145 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

Bottom bracket standard: BB86/BB92
Tire width: 2.4″
Wheel material: Aluminum
Wheel size: 27.5″

Technical analysis

4 measures

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

Front travel

150 mm

This value is above the central range for this class.

Cohort: Mountain / Trail Model year: 2024
Sample: 2,036 bicycles with this information
Coverage: 96.6% of the class

Lowest gear

17.6 gear inches

This value is below the central range for this class.

Cohort: Mountain / Trail Model year: 2024
Sample: 1,558 bicycles with this information
Coverage: 73.9% of the class

Highest gear

80.0 gear inches

This value is below the central range for this class.

Cohort: Mountain / Trail Model year: 2024
Sample: 1,558 bicycles with this information
Coverage: 73.9% of the class

Shifting

Mechanical

346 of 2,107 bicycles with this information use electronic shifting.

Cohort: Mountain / Trail Model year: 2024
Sample: 2,107 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): 17.1–98.6 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Mountain / Trail Model year: 2024
Lowest gear: 1558 bicycles with this information, 73.9% of the class
Highest gear: 1558 bicycles with this information, 73.9% 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

Differences across 2024 builds
Specification	This bicycle 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	YT Industries Jeffsy Core 4 29
Frame
Frame material	Aluminum	Aluminum	Aluminum	Aluminum	Carbon	Carbon
Bicycle weight	14.6 kg	16 kg	14.6 kg	15.5 kg	14.9 kg	15.1 kg
Drivetrain
Smallest sprocket	11	11	11	10	10	10
Largest sprocket	50	50	50	52	52	52
Lowest gear	17.6 in	18.6 in	17.6 in	17.9 in	17.9 in	17.9 in
Highest gear	80.0 in	84.4 in	80.0 in	92.8 in	92.8 in	92.8 in
Wheels
Wheel configuration	Same size	Same size	Different sizes	Same size	Same size	Same size
Cockpit
Shifting	Mechanical	Mechanical	Mechanical	Mechanical	Mechanical	Electronic
Derailleur hanger	Not informed	Not informed	Not informed	Not informed	Not informed	UDH
Other specifications
Bottom bracket standard	BB86/BB92	BSA	BB86/BB92	BSA	BB86/BB92	BB86/BB92
Tire width	2.4″	Not informed	2.4″	Not informed	Not informed	Not informed
Wheel size	27.5″	29″	29″ / 27.5″	29″	29″	29″
Fork spring	Not informed	Air	Not informed	Air	Air	Air