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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

£1,599.00

Incl VAT, excluding Custom Duties, Shipping and Import Costs. Total shown at checkout.

The JEFFSY PRIMUS JP 24 is a playful and fast bike for riders between 135 cm and 150 cm who are hunting fun. The aluminum frame and all components have been customized to deliver outstanding climing capability and the aggressive downhill performance everyone expects from a YT. Whether you like to go on long adventures or just shred the bike park, the Manitou machete JUNIT fork and custom-tuned Manitou McLeod shock make the JEFFSY PRIMUS JP 24 the perfect YT for young gravity seekers.

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  • Material

    Alloy

  • Suspension

    130mm

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.

Headtube

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.

Headtube

Headtube

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
135 cm - 150 cm | 4'4" - 4'9"

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)
Seattube Angle (act)
bb drop
wheelbase
headtube
bb height

one-size

Toptube
495 mm
Reach
370 mm
Stack
509 mm
Seattube
315 mm
Chainstay
395 mm
Headtube Angle
65,5° / 66°
Seattube Angle (eff)
76,2° / 77°
Seattube Angle (act)
72° / 72,7°
bb drop
4 / 12 mm
wheelbase
1045 mm
headtube
95 mm
bb height
316 / 324 mm
 

one-size

Toptube
495 mm
Reach
370 mm
Stack
509 mm
Seattube
315 mm
Chainstay
395 mm
Headtube Angle
65,5° / 66°
Seattube Angle (eff)
76,2° / 77°
Seattube Angle (act)
72° / 72,7°
bb drop
4 / 12 mm
wheelbase
1045 mm
headtube
95 mm
bb height
316 / 324 mm
Frame
Frame Size
Frame Size
 
one size
Color
Color
 
black magic
Wheels
Wheels
SUNringlé DUROC
 
24“ x 30mm | 110x15mm | 148x12mm
Tires
MAXXIS MINION DHF | DHR II
 
24“ X 2,4
24“ X 2,3
Suspension
Fork
MANITOU Machete JUNIT
 
24“ | 130mm | 15x110mm | 42mm Rake
adjustable Low-speed rebound, air pressure
Shock
MANITOU McLeod
 
190x40mm
4 times adjustable compression, rebound, air pressure
Drivetrain
Crankset
SRAM X1 Eagle
 
155mm | 30T | DUB
Cassette
SRAM PG1130 Eagle
 
11 - 42 T | 11-Speed
Rear derailleur
SRAM NX
 
11-Speed
Shift rear
SRAM NX
 
11-Speed
Components
Headset
Acros AZX-576
 
High Cap
Stem
SDG Jr
 
45mm
Handlebar
SDG Slater
 
20mm Rise | 650mm Width
Grips
SDG Slater Jr
 
Lock-On
Brakes
SRAM GUIDE R
 
Rotor CENTERLINE 160mm/160mm
adjustable reach
Seatpost
SDG Jr
 
31.6mm | 8MM OFFSET I RISE: +/-13° Alloy
Saddle
SDG Fly Jr
 
YT Custom
Weight
Weight
12,70 KG / 28,00 LB
 
Average weight for smallest size available, without tubes, pedals, and bottle.
Primus 2020

Primus 2020

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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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