YT Industries Jeffsy 29 AL Comp

2018 MountainTrail Manufacturer page

Last known price: $2,799

Prices shown first for United States
Travel: 140 / 140 mm Fork / rear shock
Wheels: 29″
Drivetrain: 1 × 11 32t / 9–46t
Gear range: 511%
Weight: 13.18 kg 29.1 lb · Reference configuration not specified
Frame: Aluminum
Brakes: Hydraulic disc

Sizes

Size guide

SM High
MD High
LG High
XL High

The manufacturer did not publish rider heights for these sizes.

Components

20 of 22 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.

Frame and fork

1 part

Frame

Aluminum Not identified

Suspension

2 parts

Drivetrain

8 parts

Brakes

2 parts

Wheels and tires

4 parts

Cockpit and contact points

7 parts

Sizes and geometry

4 sizes Open in the geometry plotter

Complete rider-height ranges are not published for these sizes. You can still explore the geometry below.

Size MD High

Table

Reach 425mm

Stack 610mm

Wheelbase 1154mm

Head angle 67.0°

Seat angle 74.5°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 29″ wheel; exact published values are in the table below.

Size Reach Stack

Complete manufacturer geometry table 4 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	405	425	445	465
Stackmm	605	610	623	628
Top tube lengthmm	571	592	616	637
Seat tube lengthmm	400	440	480	520
Head tube lengthmm	90	95	110	115
Head tube angle	67°	67°	67°	67°
Seat tube angle	74.5°	74.5°	74.5°	74.5°
Chainstay lengthmm	435	435	440	440
Wheelbasemm	1132	1154	1178	1205
Front centermm	698	720	739	766
Bottom bracket dropmm	24	24	24	24
Bottom bracket heightmm	350	350	350	350
Fork rakemm	42	42	36	41
Trailmm	113	113	120	114
Stack/reach ratio	1.49	1.44	1.40	1.35

Not published by the manufacturer: Standover height, 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: 13.18 kg

29.1 lb

Suspension

Suspension configuration: Full suspension
Front travel: 140 mm
Rear travel: 140 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 32
Largest chainring: 32
Rear sprockets: 11
Smallest sprocket: 9
Largest sprocket: 46
Lowest gear: 20.2 in
Highest gear: 103.1 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: 29″

Technical analysis

4 measures

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

Front travel

140 mm

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2018
Sample: 925 bicycles with this information
Coverage: 98.6% of the class

Lowest gear

20.2 gear inches

This value is above the central range for this class.

Cohort: Mountain / Trail Model year: 2018
Sample: 845 bicycles with this information
Coverage: 90.0% of the class

Highest gear

103.1 gear inches

This value is above the central range for this class.

Cohort: Mountain / Trail Model year: 2018
Sample: 845 bicycles with this information
Coverage: 90.0% of the class

Shifting

Mechanical

25 of 938 bicycles with this information use electronic shifting.

Cohort: Mountain / Trail Model year: 2018
Sample: 938 bicycles with this information
Coverage: 100.0% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 7.7 km/h
Highest gear: 39.5 km/h

Total gear range 511%

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: 20.2–103.1 gear inches
Class reference (p10–p90): 16.5–93.5 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Mountain / Trail Model year: 2018
Lowest gear: 845 bicycles with this information, 90.0% of the class
Highest gear: 845 bicycles with this information, 90.0% 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 2018 builds

Differences across 2018 builds
Specification	This bicycle YT Industries Jeffsy 29 AL Comp	YT Industries Jeffsy 27 AL	YT Industries Jeffsy 27 AL Comp	YT Industries Jeffsy 27 CF	YT Industries Jeffsy 27 CF Pro	YT Industries Jeffsy 27 CF Pro Race
Frame
Frame material	Aluminum	Aluminum	Aluminum	Carbon	Carbon	Carbon
Bicycle weight	13.18 kg	13.72 kg	13.24 kg	12.76 kg	12.47 kg	12.33 kg
Suspension
Front travel	140 mm	150 mm	150 mm	150 mm	150 mm	160 mm
Drivetrain
Lowest gear	20.2 in	19.1 in	19.1 in	19.1 in	19.1 in	19.1 in
Highest gear	103.1 in	97.8 in	97.8 in	97.8 in	97.8 in	97.8 in
Other specifications
Tire width	2.4″	2.4″	2.4″	2.35″	2.35″	2.35″
Rear travel	140 mm	150 mm	150 mm	150 mm	150 mm	160 mm
Wheel material	Aluminum	Aluminum	Aluminum	Aluminum	Aluminum	Carbon
Wheel size	29″	27.5″	27.5″	27.5″	27.5″	27.5″
Fork spring	Not informed	Air	Not informed	Not informed	Air	Air