Bike Comparison

Jeffsy Primus 24YT Industries · 2023	Jeffsy Primus 26YT Industries · 2023	Jeffsy Primus 27YT Industries · 2023

MSRP	$1,999	$2,199	$2,399
Spec Level
Where to Buy	— $1 At	— $1 At	— $1 At
Category	Mountain Youth	Mountain Youth	Mountain Youth
Weight	27.8 lbs	30.9 lbs	33.7 lbs
Frame	Aluminum	Aluminum	Aluminum
Fork	Manitou Machete Comp	RockShox Reba	RockShox Lyrik
Wheels	Aluminum	Aluminum	Aluminum
Wheel Size	24″	26″	27.5″
Brakes	Hydraulic Disc	Hydraulic Disc	Hydraulic Disc
Groupset	NX, X1	SX Eagle	SX Eagle
Drivetrain	1 × 11	1 × 12	1 × 12
Suspension	Full	Full	Full
Front Travel	130mm	140mm	150mm
Rear Travel	130mm	140mm	150mm
Seatpost	Rigid	Dropper	Dropper
Brand Site	us.yt-industries.com	us.yt-industries.com	us.yt-industries.com
Summary	The YT Industries Jeffsy Primus 24, YT Industries Jeffsy Primus 26, and YT Industries Jeffsy Primus 27 are all aluminum frame mountain youth bikes with hydraulic disc brakes. The Jeffsy Primus 24 has a rigid seatpost, 24″ aluminum wheels, and better components; the Jeffsy Primus 26 has 26″ aluminum wheels; and the Jeffsy Primus 27 has 27.5″ aluminum wheels, a better fork, more travel, and higher gearing.

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Spec Level

Based on build material and quality level of the frame, fork, wheelset, groupset, suspension system, and more. Learn more →

Jeffsy Primus 24

Jeffsy Primus 26

Jeffsy Primus 27

Gear Range

YT Industries Jeffsy Primus 24

19 mph

YT Industries Jeffsy Primus 26

21 mph

YT Industries Jeffsy Primus 27

24 mph

Learn More

Geometry

Specs

Jeffsy Primus 24YT Industries · 2023	Jeffsy Primus 26YT Industries · 2023	Jeffsy Primus 27YT Industries · 2023

Fork	MANITOU MACHETE JUNIT, 24“ \| 130mm \| 15x110mm \| 42mm Rake adjustable Low-speed rebound, air pressure	ROCKSHOX REBA, 26“ \| 140 mm Travel \| 100 x 15 mm Axle \| Offset 40 mm \| Adjustable Rebound, Air Pressure	ROCKSHOX LYRIK BASE, 27.5“ \| 150 mm Travel \| RC \| 100 x 15 mm Axle \| Offset 44 mm \| Adjustable Rebound, Air Pressure
Rear Shock	MANITOU MCLEOD, Shock Length: 190 mm \| Shock Stroke: 40 mm ≙ 130 mm Travel 4-way Adjustable Compression, Rebound, Air Pressure	ROCKSHOX DELUXE SELECT, Shock Length: 190 mm \| Shock Stroke: 45 mm ≙ 140 mm Travel \| Adjustable Rebound, Air Pressure, Custom Tune	ROCKSHOX DELUXE SELECT, Shock Length: 230 mm \| Shock Stroke: 60 mm ≙ 150 mm Travel \| Adjustable Rebound, Air Pressure, Custom Tune 0L1230x60mm \| R \|Custom Tune 0L1\| Volume Reducer
Headset	Acros AZX-576, High Cap	Acros AZX-576, High Cap	ACROS AZX-576, High Cap \| 2 Spacer 5 mm
Stem	SDG JR, Length 40 mm \| 31,8 mm Clamp \| Rise +/-3°	E13 Base, 40mm	E13 BASE 35, Length 40 mm \| 35 mm Clamp \| Rise 0° \| 6061 AL
Handlebar	SDG SLATER, Width 650 mm \| Rise 20 mm \| 8° Back Sweep \| 5° Up Sweep	E13 Base, 20mm Rise \| 760mm Width	E13 BASE 35, Width 760 mm \| Rise 20 mm \| 9° Back Sweep \| 5° Up Sweep \| 6061 AL
Saddle	SDG FLY JR, YT Custom \| Width 122 mm	SDG BEL AIR 3.0, YT Custom \| Width 140 mm I Lux-Alloy Rail	SDG BEL AIR 3.0, YT Custom \| Width 140 mm I Lux-Alloy Rail
Seatpost	SDG JR, Ø 31.6 mm \| Length 250 mm \| 8 mm Offset I +/- 13mm Rise	YT Postman, 31.6mm \| 100mm Drop	YT POSTMAN, Ø 31.6 mm \| Length 125 mm \| Standard-Remote
Grips	SDG SLATER JR, Lock On	ODI Elite Motion V2.1, Lock-On	ODI ELITE MOTION V2.1, Lock On

Groupset

Rear Derailleur	SRAM NX, 11-speed	SRAM SX EAGLE, 12-Speed	SRAM SX EAGLE, 12-speed
Crank	SRAM X1, Crank Arm Length 155 mm \| 30 T \| DUB	SRAM SX EAGLE, 155mm \| 30T \| DUB	SRAM SX EAGLE, Crank Arm Length 165 mm \| 32T \| DUB
Shifters	SRAM NX, 11-speed	SRAM SX EAGLE, 12-Speed	SRAM SX EAGLE, 12-speed
Cassette	SRAM PG1130, 11-42T \| 11-speed	SRAM PG1210 Eagle, 11-50T \| 12-Speed	SRAM PG1210 Eagle, 11-50T \| 12-speed
Brakes	SRAM G2 R, Rotor CENTERLINE Ø front 160 mm / rear 160 mm Adjustable Reach	SRAM G2 R, Rotor CENTERLINE Ø front 160 mm / rear 160 mm Adjustable Reach	SRAM G2 R, Rotor CENTERLINE Ø front 200 mm / rear 200 mm Adjustable Reach

Wheels

Rims	SUNringlé DUROC, 24“ x 30mm \| 110x15mm \| 148x12mm	SUNringlé DUROC, 26“ x 30mm \| 100x15mm \| 148x12mm	SUNRINGLÉ DUROC 35, Aluminum Rims 27.5“ \| Inner Width 31 mm \| Front Hub 100 x 15 mm \| Rear Hub 148 x 12 mm
Tires	MAXXIS MINION DHF \| DHR II, 24“ X 2,4 24“ X 2,3	MAXXIS Minion DHF \|DHR II, 26" X 2,4 \| 26“ X 2,3	FRONT: MAXXIS MINION DHF I REAR: MAXXIS MINION DHR II, Front: Tire Size 27.5“ x 2.4 I EXO Casing I 3C MaxxTerra Compound I Tubeless Ready I Rear: Tire Size 27.5“ x 2.3 I EXO Casing I Dual Compound I Tubeless Ready

Fork	MANITOU MACHETE JUNIT, 24“ \| 130mm \| 15x110mm \| 42mm Rake adjustable Low-speed rebound, air pressure	ROCKSHOX REBA, 26“ \| 140 mm Travel \| 100 x 15 mm Axle \| Offset 40 mm \| Adjustable Rebound, Air Pressure	ROCKSHOX LYRIK BASE, 27.5“ \| 150 mm Travel \| RC \| 100 x 15 mm Axle \| Offset 44 mm \| Adjustable Rebound, Air Pressure
Rear Shock	MANITOU MCLEOD, Shock Length: 190 mm \| Shock Stroke: 40 mm ≙ 130 mm Travel 4-way Adjustable Compression, Rebound, Air Pressure	ROCKSHOX DELUXE SELECT, Shock Length: 190 mm \| Shock Stroke: 45 mm ≙ 140 mm Travel \| Adjustable Rebound, Air Pressure, Custom Tune	ROCKSHOX DELUXE SELECT, Shock Length: 230 mm \| Shock Stroke: 60 mm ≙ 150 mm Travel \| Adjustable Rebound, Air Pressure, Custom Tune 0L1230x60mm \| R \|Custom Tune 0L1\| Volume Reducer
Headset	Acros AZX-576, High Cap	Acros AZX-576, High Cap	ACROS AZX-576, High Cap \| 2 Spacer 5 mm
Stem	SDG JR, Length 40 mm \| 31,8 mm Clamp \| Rise +/-3°	E13 Base, 40mm	E13 BASE 35, Length 40 mm \| 35 mm Clamp \| Rise 0° \| 6061 AL
Handlebar	SDG SLATER, Width 650 mm \| Rise 20 mm \| 8° Back Sweep \| 5° Up Sweep	E13 Base, 20mm Rise \| 760mm Width	E13 BASE 35, Width 760 mm \| Rise 20 mm \| 9° Back Sweep \| 5° Up Sweep \| 6061 AL
Saddle	SDG FLY JR, YT Custom \| Width 122 mm	SDG BEL AIR 3.0, YT Custom \| Width 140 mm I Lux-Alloy Rail	SDG BEL AIR 3.0, YT Custom \| Width 140 mm I Lux-Alloy Rail
Seatpost	SDG JR, Ø 31.6 mm \| Length 250 mm \| 8 mm Offset I +/- 13mm Rise	YT Postman, 31.6mm \| 100mm Drop	YT POSTMAN, Ø 31.6 mm \| Length 125 mm \| Standard-Remote
Grips	SDG SLATER JR, Lock On	ODI Elite Motion V2.1, Lock-On	ODI ELITE MOTION V2.1, Lock On

Rims	SUNringlé DUROC, 24“ x 30mm \| 110x15mm \| 148x12mm	SUNringlé DUROC, 26“ x 30mm \| 100x15mm \| 148x12mm	SUNRINGLÉ DUROC 35, Aluminum Rims 27.5“ \| Inner Width 31 mm \| Front Hub 100 x 15 mm \| Rear Hub 148 x 12 mm
Tires	MAXXIS MINION DHF \| DHR II, 24“ X 2,4 24“ X 2,3	MAXXIS Minion DHF \|DHR II, 26" X 2,4 \| 26“ X 2,3	FRONT: MAXXIS MINION DHF I REAR: MAXXIS MINION DHR II, Front: Tire Size 27.5“ x 2.4 I EXO Casing I 3C MaxxTerra Compound I Tubeless Ready I Rear: Tire Size 27.5“ x 2.3 I EXO Casing I Dual Compound I Tubeless Ready