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Junior

The JEFFSY PRIMUS - no bullshit, no bedtime stories - but a real MTB for motivated young riders. In function and handling, it's as capable as its big brother JEFFSY, but in a smaller size. Whether you're headed out for an enduro loop, a day in the bike park, or a jump line session, the JEFFSY PRIMUS lets you go big regardless of how big you are. Get some little shredders!

Choose Your Wheel Size

junior
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Wheels: 24 | 26
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AL
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Jeffsy Primus 26

One Size

One Size - Ships Latest May 2022

$3,299.00

The JEFFSY PRIMUS JP 26 wants you to get out there and discover the world. Specifically developed for riders between 145 cm and 160 cm, its playful character and robust aluminum frame make it a keen partner for having fun. Whether you're on flowy trails, a long ride, or heading to the bike park to shred, uncompromising components such as the 140 mm Manitou Machete fork and the custom-tuned RockShox Deluxe Select+ shock will have your back anywhere.

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  • Material

    Alloy

  • Suspension

    140 mm

Tech + Specs
  • Frame

  • Protection

  • Headtube

  • Internal Cable Routing

  • Chainsuck

  • Bearings

  • Virtual Four Link

Frame

Protection

Made from super-tough and wear-resistant PA 66, the downtube protector is bolted on and can be easily replaced. It is designed to wrap around the bottom bracket and thus provide extra protection for the side walls of the downtube from impacts and scratches. Additionally, the rubber chainstay and seatstay guards help prevent unwanted noise from the drivetrain.

Protection

Made from super-tough and wear-resistant PA 66, the downtube protector is bolted on and can be easily replaced. It is designed to wrap around the bottom bracket and thus provide extra protection for the side walls of the downtube from impacts and scratches. Additionally, the rubber chainstay and seatstay guards help prevent unwanted noise from the drivetrain.

Headtube

To optimize the weight to performance ratio, the contact surfaces for the integrated headset are pre-formed directly in the frame. Additionally, the ZeroStack design ensures a high level of durability thanks to the integrated bearing shells.

Internal Cable Routing

For optimal protection, all cables are routed almost completely through the frame. Small ridges ensure the cable plugs sit tight in the in the frame to seal the cable ports and a cable clamp holds them securely in place as they exit the frame under the rocker link.

Chainsuck

The inconspicuous chainsuck plates protect the frame from damage caused by a dropped chain keeping critical areas out of harm's way.

Bearings

Extra seals protect the high-quality, double-sealed full complement bearings to keep water and dirt out and help prolong the service life.

Virtual Four Link

Our award-winning V4L suspension technology provides sensitivity off the top, with good mid-stroke support and plenty of end-stroke progressivity. The nice pop helps get the bike airborne whenever wanted, while the end-stroke progressivity makes sure the rear shock doesn't bottom out even on monster jumps. The high amount of anti-squat keeps the rear suspension neutral and improves pedal efficiency.

Protection

Protection

Made from super-tough and wear-resistant PA 66, the downtube protector is bolted on and can be easily replaced. It is designed to wrap around the bottom bracket and thus provide extra protection for the side walls of the downtube from impacts and scratches. Additionally, the rubber chainstay and seatstay guards help prevent unwanted noise from the drivetrain.

Protection

Made from super-tough and wear-resistant PA 66, the downtube protector is bolted on and can be easily replaced. It is designed to wrap around the bottom bracket and thus provide extra protection for the side walls of the downtube from impacts and scratches. Additionally, the rubber chainstay and seatstay guards help prevent unwanted noise from the drivetrain.

Headtube

Headtube

To optimize the weight to performance ratio, the contact surfaces for the integrated headset are pre-formed directly in the frame. Additionally, the ZeroStack design ensures a high level of durability thanks to the integrated bearing shells.

Internal Cable Routing

Internal Cable Routing

For optimal protection, all cables are routed almost completely through the frame. Small ridges ensure the cable plugs sit tight in the in the frame to seal the cable ports and a cable clamp holds them securely in place as they exit the frame under the rocker link.

Chainsuck

Chainsuck

The inconspicuous chainsuck plates protect the frame from damage caused by a dropped chain keeping critical areas out of harm's way.

Bearings

Bearings

Extra seals protect the high-quality, double-sealed full complement bearings to keep water and dirt out and help prolong the service life.

Virtual Four Link

Virtual Four Link

Our award-winning V4L suspension technology provides sensitivity off the top, with good mid-stroke support and plenty of end-stroke progressivity. The nice pop helps get the bike airborne whenever wanted, while the end-stroke progressivity makes sure the rear shock doesn't bottom out even on monster jumps. The high amount of anti-squat keeps the rear suspension neutral and improves pedal efficiency.

sGeometry Sizefinder
One Size
145 cm - 160 cm | 4'9" - 5'3"

This size table is only a suggestion. The optimal frame size depends also on your personal riding style.

Toptube
Reach
Stack
Seattube
Chainstay
Headtube Angle
Seattube Angle (eff)
bb drop
wheelbase
headtube
bb height

one-size

Toptube
533 mm
Reach
397 mm
Stack
549 mm
Seattube
355 mm
Chainstay
415 mm
Headtube Angle
65,5° / 66°
Seattube Angle (eff)
76,5° / 77°
bb drop
-5 / 4mm
wheelbase
1105 mm
headtube
95 mm
bb height
340 / 349 mm
 

one-size

Toptube
533 mm
Reach
397 mm
Stack
549 mm
Seattube
355 mm
Chainstay
415 mm
Headtube Angle
65,5° / 66°
Seattube Angle (eff)
76,5° / 77°
bb drop
-5 / 4mm
wheelbase
1105 mm
headtube
95 mm
bb height
340 / 349 mm
Frame
Frame Size
Frame Size
 
ONE SIZE
Color
Color
 
BLACK MAGIC
Wheels
Wheels
SUNRINGLÉ DUROC
 
Aluminum Rims 26“ | Inner Width 30 mm | Front Hub 100 x 15 mm | Rear Hub 148 x 12 mm
Tires
FRONT: MAXXIS MINION DHF I HINTEN: MAXXIS MINION DHR II
 
Front: Tire Size 26“ x 2.4 I EXO Casing I 3C MaxxTerra Compound I Tubeless Ready I Rear: Tire Size 26“ x 2.3 I EXO Casing I Dual Compound I Tubeless Ready
Suspension
Fork
MANITOU MACHETE JUNIT
 
26“ | 140 mm Travel | 100 x 15 mm Axle | Offset 41 mm Adjustable Rebound, Air Pressure
Shock
ROCKSHOX DELUXE SELECT+
 
Shock Length: 190 mm | Shock Stroke: 45 mm ≙ 140 mm Travel 2-pos lever, Lockout, Adjustable Compression, Rebound, Air Pressure, Custom Tune
Drivetrain
Crankset
SRAM SX EAGLE
 
Crank Arm Length 165 mm | 34 T | DUB
Cassette
SRAM PG1210 Eagle
 
11-50T | 12-speed
Rear derailleur
SRAM SX EAGLE
 
12-speed
Shifter rear
SRAM SX EAGLE
 
12-speed
Components
Headset
ACROS AZX-576
 
High Cap | 2 Spacer 5 mm
Stem
E13 BASE 35
 
Length 40 mm | 35 mm Clamp | Rise 0° | 6061 AL
Handlebar
E13 BASE 35
 
Width 760 mm | Rise 20 mm | 9° Back Sweep | 5° Up Sweep | 6061 AL
Grips
ODI ELITE MOTION V2.1
 
Lock On
Brakes
SRAM Guide R Custom
 
Rotor CENTERLINE Ø front 180 mm / rear 180 mm Adjustable Reach
Seatpost
YT POSTMAN
 
Ø 31.6 mm | Length 100 mm | Standard-Remote
Saddle
SDG RADAR MNT
 
YT Custom | Width 138 mm
Weight
Weight
 
Average weight for smallest size available, without tubes, pedals, and bottle.
Primus 2021

Primus 2021

PDF | 5.58 MB

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Carbon Icon

Our carbon frames deliver ideal stiffness and ultimate reliability at impressively low weight. Using a monocoque production technique, tube walls get extra thickness only where required, to resist the intense forces in critical areas. By using fibers of different strengths and optimizing the layup, we create stiff yet lightweight frames that withstand even the gnarliestof maneuvers.

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