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Size

Color

Version

Thirstmaster 4000 bottle set - JEFFSY MK2, IZZO MK1, SZEPTER MK1

Thirstmaster 4000 bottle set - JEFFSY MK2, IZZO MK1, SZEPTER MK1

$69.90

27
27
JUNIOR

There’s a new kid on the block. Say hello to the all-new JEFFSY PRIMUS 27, an aggressive ride for riders between 156 - 165cm. More than just a bike for pint-sized rippers, the PRIMUS 27 is the real deal, and with 150mm of travel and a bombproof aluminum frame, it’s every bit as shreddable as our adult range. From the bike park to epic backcountry adventures, and from that first taste of airtime to the biggest sends at the jump spot, there’s no stopping this ride; it’s a do-it-all weapon built with Young Talents in mind.

Right down to the smallest detail, this bike will see riders crush their goals and skyrocket their skills. RockShox air suspension, a 12-speed drivetrain, powerful four-piston brakes, and durable SUNRinglé Duroc 35 wheels – there are no half-measures here! The PRIMUS 27 inspires confidence and eats burly features for breakfast, making it the ultimate choice to kickstart your young rider’s MTB journey. 

Choose Your

Wheels
Color
Size

27

Wheel size
27
Color / Size

Choose Your Wheel Size

Choose Your Frame Size

inch

cm

154cm-165cm

Nox Blue

This bike has the earliest arrival

All Available Options

See Other Options

$2,349.00

$3,349.00
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Total Amount Without Sales Tax:
Tech + Specs
  • Frame

  • FRAME PROTECTION

  • Headtube

  • Internal Cable Routing

  • Chainsuck protection

  • SEALED BEARINGS

  • Virtual Four Link

Frame

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

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. They are guided through the chainstay with internal cable tubes, while they are wrapped in foam as they pass through the main frame to reduce weight and at the same time prevent noise. All cable ports are protected against the ingress of dirt and water with cable plugs. Additionally, the cables are secured on the head tube with cable clamps and they are routed over the main pivot to prevent chafing.

Chainsuck protection

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

SEALED 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.

FRAME PROTECTION

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

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. They are guided through the chainstay with internal cable tubes, while they are wrapped in foam as they pass through the main frame to reduce weight and at the same time prevent noise. All cable ports are protected against the ingress of dirt and water with cable plugs. Additionally, the cables are secured on the head tube with cable clamps and they are routed over the main pivot to prevent chafing.

Chainsuck protection

Chainsuck protection

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

SEALED BEARINGS

SEALED 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.

One Size
154 cm - 165 cm | 5'1" - 5'5"

Toptube
Reach
Stack
Seattube
Chainstay
Headtube Angle
Seattube Angle (eff)
BB Drop low/<br>high
wheelbase
headtube
BB Height

one-size

Toptube
567 mm
Reach
422 mm
Stack
598 mm
Seattube
395 mm
Chainstay
432 mm
Headtube Angle
65,7° / 66.2°
Seattube Angle (eff)
76,4° / 77°
BB Drop low/
high
13 / 6 mm
wheelbase
1167 mm
headtube
110 mm
BB Height
344 / 352 mm
 

one-size

Toptube
567 mm
Reach
422 mm
Stack
598 mm
Seattube
395 mm
Chainstay
432 mm
Headtube Angle
65,7° / 66.2°
Seattube Angle (eff)
76,4° / 77°
BB Drop low/
high
13 / 6 mm
wheelbase
1167 mm
headtube
110 mm
BB Height
344 / 352 mm
Jeffsy CORE Manual

Jeffsy CORE Manual

PDF | 6.48 MB

Choose Your Jeffsy Primus

24

24

2179
3099
Frame Alloy 130mm
Fork MANITOU MACHETE JUNIT
Shock MANITOU MCLEOD
Drivetrain SRAM NX
Go to bike

26

26

2179
3099
Frame Alloy 140 mm
Fork ROCKSHOX REBA
Shock ROCKSHOX DELUXE SELECT
Drivetrain SRAM SX EAGLE
Go to bike

27

27

2349
3349
Frame Alloy 150mm
Fork ROCKSHOX LYRIK BASE
Shock ROCKSHOX DELUXE SELECT
Drivetrain SRAM SX EAGLE
Go to bike
Alternatives

YT
Range

Dirt
Junior
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