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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 really 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

One Size

£1,699.00

incl. VAT plus Custom Duties, Shipping and Import Cost

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

    100mm

Tech + Specs
  • Frame

  • Flip chip

  • Protection

  • Headtube

  • Chainsuck

  • Bearings

  • Virtual Four Link

Frame

Flip chip

Situated at the lower shock mount, the Flip Chip makes it quick and easy to adjust the geometry according to the terrain and riding style. The low position provides for a more aggressive headtube angle and a bigger BB drop, ideal for fast and rough tracks. In the high position, the headtube angle is 0.5 degrees steeper and the BB is higher. The higher BB gives more ground clearance and better performance on longer steep climbs.

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

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.

Flip chip

Flip chip

Situated at the lower shock mount, the Flip Chip makes it quick and easy to adjust the geometry according to the terrain and riding style. The low position provides for a more aggressive headtube angle and a bigger BB drop, ideal for fast and rough tracks. In the high position, the headtube angle is 0.5 degrees steeper and the BB is higher. The higher BB gives more ground clearance and better performance on longer steep climbs.

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.

Headtube

Headtube

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.

Toptube
Reach
Stack
Seattube
Chainstay
Headtube Angle
Seattube Angle (eff)
Seattube Angle (act)
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°
Seattube Angle (act)
72° / 72,5°
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°
Seattube Angle (act)
72° / 72,5°
bb drop
-5 / 4mm
wheelbase
1105 mm
headtube
95 mm
bb height
340 / 349 mm
sGeometry Sizefinder
One Size
145 cm - 160 cm | 4'8" - 5'2"

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

Frame
Frame Size
Frame Size
 
one size
Color
Color
 
black magic
Wheels
Wheels
SUNringlé DUROC
 
26“ x 30mm | 100x15mm | 148x12mm
Tires
MAXXIS Minion DHF |DHR II
 
26" X 2,4 |
26“ X 2,3
Spring Elements
Fork
MANITOU Machete
 
26“ | 140mm | 15x100mm
adjustable rebound, air pressure
Shock
RockShox Deluxe Select +
 
190x4 5mm
adjustable compression and rebound, air volume, air pressure
Drivetrain
Crankset
SRAM SX Eagle
 
165mm | 30T | DUB
Cassette
SRAM PG1210 Eagle
 
11-50T | 12-Speed
Rear derailleur
SRAM SX Eagle
 
12-Speed
Shift rear
SRAM SX Eagle
 
12-Speed
Components
Headset
Acros AZX-576
 
High Cap
Stem
E13 Base
 
40mm
Handlebar
E13 Base
 
20mm Rise | 760mm Width
Grips
ODI Elite Motion V2.1
 
Lock-On
Brakes
SRAM GUIDE R
 
Rotor CENTERLINE 180mm/180mm
adjustable reach
Seatpost
YT Postman
 
31.6mm | 100mm Drop
Saddle
SDG RADAR MNT
 
YT Custom
Weight
Weight
14,20 KG / 31,31 LB
 
Average weight for smallest size available, without tubes, pedals, and bottle.
Primus

Primus

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Aluminium Icon

The AL model was developed specifically for lovers of high-quality aluminum bikes. The elaborately-designed frame sets new standards in aluminum workmanship: the multi-butted, hydroformed tubes don't only keep weight down and improve resilience, but embody the look of a true YT. High performance at an attractive price is the focus here.

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