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We've added the following to your cart:

Size

Color

Version

Thirstmaster 4000 bottle set

Thirstmaster 4000 bottle set

49.90 €

Crankbrothers STAMP 7 Large Pedal

Crankbrothers STAMP 7 Large Pedal

129.90 €

Crankbrothers Gem Hand Pump

Crankbrothers Gem Hand Pump

19.90 €

Crankbrothers F15 Multitool

Crankbrothers F15 Multitool

39.90 €

Peaty's tubeless conversion kit

Peaty's tubeless conversion kit

29.90 €

Crankbrothers CANDY 7 Pedal

Crankbrothers CANDY 7 Pedal

129.90 €

Thirstmaster 4000 bottle set

Thirstmaster 4000 bottle set

49.90 €

Crankbrothers STAMP 7 Large Pedal

Crankbrothers STAMP 7 Large Pedal

129.90 €

Crankbrothers Gem Hand Pump

Crankbrothers Gem Hand Pump

19.90 €

Crankbrothers F15 Multitool

Crankbrothers F15 Multitool

39.90 €

Peaty's tubeless conversion kit

Peaty's tubeless conversion kit

29.90 €

Crankbrothers CANDY 7 Pedal

Crankbrothers CANDY 7 Pedal

129.90 €

29
27
ALL MOUNTAIN

CORE 2 stands for a versatile platform with a smart parts specification that combines performance and efficiency. The JEFFSY CORE 2 will please both beginners and experts alike, with its high-end aluminum frame. These robust bikes are ready for the toughest missions, thanks to high-quality components and uncomplicated suspension elements. Regardless of whether you want to go out for a quick rip or a long bike trip – with the JEFFSY CORE 2 you’ll be ready for anything.

CORE 2

Choose Your

Wheels
Color
Size
Core

CORE 2

Wheel size
29
27
Color / Size

Choose Your Wheel Size

Choose Your Frame Size

inch

cm

154cm-165cm

164cm-175cm

174cm-184cm

183cm-193cm

192cm-202cm

Metal Silver

S

August 2033

M

February 2032

L

February 2032

XL

June 2033

XXL

August 2033

Black Magic

S

In Stock

M

August 2033

L

In Stock

XL

In Stock

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!

#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.

27

The JEFFSY is for those who prefer an even more agile and playful bike. The rear wheel is stable, reactive and dynamic through the turns. You won’t have to back down in rough terrain, and because you might want to take it off a jump or two, we’ve
given the JEFFSY a bit more suspension travel. This means you can relax when things get gnarly, and it also means that JEFFSY is the right choice when it comes to dropping the hammer in your next enduro race.

Tech + Specs
  • Frame

  • Flip chip

  • Protection

  • Bearings

  • Chainsuck

  • 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

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

Chainsuck

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
567 mm
590 mm
613 mm
636 mm
660 mm
Reach
422 mm
442 mm
462 mm
482 mm
502 mm
Stack
598 mm
608 mm
617 mm
626 mm
635 mm
Seattube
395 mm
415 mm
435 mm
460 mm
485 mm
Chainstay
432 mm
432 mm
432 mm
437 mm
437 mm
Headtube Angle
65,5° / 66°
65,5° / 66°
65,5° / 66°
65,5° / 66°
65,5° / 66°
Seattube Angle (eff)
76,5° / 77°
76,5° / 77°
76,5° / 77°
76,5° / 77°
76,5° / 77°
bb drop
13 / 6 mm
13 / 6 mm
13 / 6 mm
13 / 6 mm
13 / 6 mm
wheelbase
1167 mm
1191 mm
1215 mm
1244 mm
1268 mm
headtube
110 mm
120 mm
130 mm
140 mm
150 mm
bb height
344 / 352 mm
344 / 352 mm
344 / 352 mm
344 / 352 mm
344 / 352 mm
Standover height
676 mm
684 mm
697 mm
711 mm
726 mm
 

s

m

l

xl

xxl

Toptube
567 mm
590 mm
613 mm
636 mm
660 mm
Reach
422 mm
442 mm
462 mm
482 mm
502 mm
Stack
598 mm
608 mm
617 mm
626 mm
635 mm
Seattube
395 mm
415 mm
435 mm
460 mm
485 mm
Chainstay
432 mm
432 mm
432 mm
437 mm
437 mm
Headtube Angle
65,5° / 66°
65,5° / 66°
65,5° / 66°
65,5° / 66°
65,5° / 66°
Seattube Angle (eff)
76,5° / 77°
76,5° / 77°
76,5° / 77°
76,5° / 77°
76,5° / 77°
bb drop
13 / 6 mm
13 / 6 mm
13 / 6 mm
13 / 6 mm
13 / 6 mm
wheelbase
1167 mm
1191 mm
1215 mm
1244 mm
1268 mm
headtube
110 mm
120 mm
130 mm
140 mm
150 mm
bb height
344 / 352 mm
344 / 352 mm
344 / 352 mm
344 / 352 mm
344 / 352 mm
Standover height
676 mm
684 mm
697 mm
711 mm
726 mm
Jeffsy CORE Manual

Jeffsy CORE Manual

PDF | 6.48 MB

Choose Your jeffsy

CORE 4

29

4,999.00 €
5,199.00 €
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 €
4,199.00 €
Frame Carbon 150mm
Fork FOX 36 FLOAT PERFORMANCE ELITE
Shock FOX FLOAT DPX2 PERFORMANCE ELITE
Drivetrain SRAM GX EAGLE
Go to bike

CORE 2

29

27

2,999.00 €
Frame Alloy 150mm
Fork FOX 36 FLOAT PERFORMANCE
Shock FOX FLOAT DPX2 PERFORMANCE
Drivetrain SRAM NX EAGLE
Go to bike

UNCAGED 8

29

5,299.00 €
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.