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We've added the following to your cart:

Size

Color

Version

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

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

34.90 €

Crankbrothers STAMP 7 Large Pedal

Crankbrothers STAMP 7 Large Pedal

109.90 €

Crankbrothers Gem Hand Pump

Crankbrothers Gem Hand Pump

15.90 €

Crankbrothers F15 Multitool

Crankbrothers F15 Multitool

29.90 €

Peaty's tubeless conversion kit

Peaty's tubeless conversion kit

19.90 €

Crankbrothers CANDY 7 Pedal

Crankbrothers CANDY 7 Pedal

99.90 €

YT x Peaty's bicycle cleaning kit

YT x Peaty's bicycle cleaning kit

79.90 €

Core
29
29
ALL MOUNTAIN

We cut no corners for the highest CORE level – these uncompromising Factory Team level packages were made for taking on the most demanding terrain. The JEFFSY CORE 4 are equipped with the very best components and every little detail has been optimized for performance – from the high-end parts to the top-notch carbon frame. The suspension elements are fully adjustable to ensure that even the gnarliest trails are within your comfort zone. From the race track to the home trails, these bikes leave nothing to be desired – but that also means that there are no more excuses.

CORE 4

Choose Your

Wheels
Color
Size
Core

CORE 4

Wheel size
29
Color / Size

Choose Your Wheel Size

Choose Your Frame Size

inch

cm

154cm-165cm

164cm-175cm

174cm-184cm

183cm-193cm

192cm-202cm

Vlad Red

S

Currently Not Available

M

Currently Not Available

L

In Stock

XL

In Stock

XXL

In Stock

Black Magic

S

Currently Not Available

M

Currently Not Available

L

Currently Not Available

XL

Currently Not Available

XXL

In Stock

This bike has the earliest arrival

All Available Options

See Other Options

0.00 €

Financing Calculator

x
Installment Plan Disposition
-

Fixed debit interest rate of 0 (annual) applies only to the first 36 Months from Conclusion of the contract (Fixed-interest period); You have to do monthly installments in the amount you choose. If you do not redeem your installment plan within the fixed-interest period, the conditions for subsequent disposals apply.

Subsequent dispositions
+

For other and future dispositions (subsequent dispositions) the variable debit interest rate (annually) is 14.84% (if you already have a line of credit with us, the actual variable interest rate may differ). For subsequent orders, you must make monthly installments in the amount you have chosen, but at least chosen by you, but at least 2.5% of the highest debit balance rounded to a full €100 of the subsequent orders (min. 9 €). Payments for follow-up orders will only be credited to interest-bearing In the event of different interest rates, the higher interest rate will be credited first.

Notify Me!
Financing with Consors

You can select financing as one of the payment method options. After completing the ordering process, you will be automatically redirected to the website of our financing partner, Consors Finanz BNP Paribas. The effective annual interest rate is 3.9% with terms available between 6 and 72 months. Please note that financing is currently only possible for customers in Germany and Austria.

View more details

Leasing with Jobrad

Together with Jobrad, we offer companies and employees the opportunity to lease bikes. Since bicycles are treated like company cars for tax purposes, both sides benefit from the JobRad concept.

View more details

#Size
Doesn't
Matter

Shred
Downhill
Uphill

29

No Question about it; The JEFFSY 29 is the most aggressive and agile 29er on the market. The large 29“ wheels compliment the compact frame‘s silhouette perfectly and are also responsible for the significant amount of BB drop - leaving you low in the sweet spot of the bike, feeling right at home and perfectly in control even in the wildest situations. The larger tire contact patch provides outstanding grip and unheard-of traction and drive, which you will really appreciate while racking up the kilometers during long backcountry adventures. When it comes to high-speed descending, the big wheels increase stability and keep you on track even on the roughest trails. The increased diameter reduces harshness and helps the wheels roll more easily over rocks and roots.

Tech + Specs
  • Frame

  • Flip chip

  • Protection

  • Bearings

  • Chainsuck protection

  • Headtube

  • Internal Cable Routing

  • 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.

Bearings

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

Chainsuck protection

The inconspicuous chainsuck plates protect the frame from damage caused by a dropped chain. This keeps sensitive areas out of harm's way and helps prolong the frame's durability.

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. Uninterrupted internal tubes provide for easy cable replacement and also help prevent unwanted noise. Small ridges ensure the cable plugs sit tight 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.

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.

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.

Chainsuck protection

Chainsuck protection

The inconspicuous chainsuck plates protect the frame from damage caused by a dropped chain. This keeps sensitive areas out of harm's way and helps prolong the frame's durability.

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. Uninterrupted internal tubes provide for easy cable replacement and also help prevent unwanted noise. Small ridges ensure the cable plugs sit tight 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.

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
S
154 cm - 165 cm | 5'1" - 5'5"
M
164 cm - 175 cm | 5'4.5" - 5'9"
L
174 cm - 184 cm | 5'8" - 6'0.5"
XL
183 cm - 193 cm | 6'0" - 6'4"
XXL
192cm - 202cm | 6'3.5" - 6'8"

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
Standover height

s

m

l

xl

xxl

Toptube
572 mm
593 mm
615 mm
638 mm
660 mm
Reach
430 mm
450 mm
470 mm
490 mm
510 mm
Stack
618 mm
622 mm
627 mm
636 mm
640 mm
Seattube
400 mm
415 mm
435 mm
460 mm
485 mm
Chainstay
435 mm
435 mm
435 mm
440 mm
440 mm
Headtube Angle
66° / 66,5°
66° / 66,5°
66° / 66,5°
66° / 66,5°
66° / 66,5°
Seattube Angle (eff)
77° / 77,5°
77° / 77,5°
77° / 77,5°
77° / 77,5°
77° / 77,5°
bb drop
32 / 24 mm
32 / 24 mm
32 / 24 mm
32 / 24 mm
32 / 24 mm
wheelbase
1174 mm
1196 mm
1218 mm
1247 mm
1269 mm
headtube
100 mm
105 mm
110 mm
120 mm
125 mm
bb height
344 / 352 mm
344 / 352 mm
344 / 352 mm
344 / 352 mm
344 / 352 mm
Standover height
706 mm
702 mm
701 mm
693 mm
694 mm
 

s

m

l

xl

xxl

Toptube
572 mm
593 mm
615 mm
638 mm
660 mm
Reach
430 mm
450 mm
470 mm
490 mm
510 mm
Stack
618 mm
622 mm
627 mm
636 mm
640 mm
Seattube
400 mm
415 mm
435 mm
460 mm
485 mm
Chainstay
435 mm
435 mm
435 mm
440 mm
440 mm
Headtube Angle
66° / 66,5°
66° / 66,5°
66° / 66,5°
66° / 66,5°
66° / 66,5°
Seattube Angle (eff)
77° / 77,5°
77° / 77,5°
77° / 77,5°
77° / 77,5°
77° / 77,5°
bb drop
32 / 24 mm
32 / 24 mm
32 / 24 mm
32 / 24 mm
32 / 24 mm
wheelbase
1174 mm
1196 mm
1218 mm
1247 mm
1269 mm
headtube
100 mm
105 mm
110 mm
120 mm
125 mm
bb height
344 / 352 mm
344 / 352 mm
344 / 352 mm
344 / 352 mm
344 / 352 mm
Standover height
706 mm
702 mm
701 mm
693 mm
694 mm
Jeffsy CORE Manual

Jeffsy CORE Manual

PDF | 6.48 MB

Choose Your jeffsy

CORE 4

29

4,999.00 €
Frame Carbon 150mm
Fork FOX 36 FLOAT FACTORY
Shock FOX FLOAT DPX2 FACTORY
Drivetrain SRAM X01 EAGLE
Go to bike

CORE 3

29

3,999.00 €
Frame Carbon 150mm
Fork FOX 36 FLOAT PERFORMANCE ELITE
Shock FOX FLOAT DPX2 PERFORMANCE ELITE
Drivetrain SRAM GX EAGLE
Go to bike

CORE 2

27

29

2,999.00 €
Frame Alloy 160mm
Fork FOX 36 Float Performance
Shock FOX FLOAT DPX2 PERFORMANCE
Drivetrain SRAM NX EAGLE
Go to bike

UNCAGED 8

29

4,699.00 €
5,499.00 €
Frame Carbon 150mm
Fork CANE CREEK HELM MK2
Shock CANE CREEK KITSUMA AIR
Drivetrain SRAM GX EAGLE AXS
Go to bike
Alternatives

YT
Range

E-MTB All Mountain
All Mountain
Enduro
YOU ARE LOOKING FOR AN ALTERNATIVE?

If you're wondering whether this is exactly the right bike for you, it might be worth checking out a different category as well.