JEFFSY 27 CF Framekit

usually:  £2,199.00 £1,399.00

Your discount: £800.00

incl. VAT plus shipping costs

  • S
    sold out
  • M
    sold out
  • L
    sold out
  • XL
    sold out

Far out or nothing – JEFFSY® represents our very own definition of trail riding.
With gravity DNA, JEFFSY is the most aggressive all-mountain bike on the market, the YT amongst trail bikes, perfect for all those of you who want to ride a tad faster, more aggressive and more creative than everybody else. The frame scores points with a compact silhouette, an undoubtedly gravity-inspired geometry and one of the most aggressive headtube angles to be found on any trail bike today. The low stand over height, distinctive reach, wide riser handlebar and compact chain stays ensure optimal handling. And because we make no compromises, the length of the rear triangle is optimized for each frame size. The result is the perfect balance: you climb effortlessly, you fly through corners, and you even feel right at home when things get rugged, hard, and fast.

Everything you need. The JEFFSY frame kit in the liquid metal / black magic color combo comes complete with the enclosed headset (not pressed-in) and toolkit. The FOX DPX2 Factory shock, seatpost clamp, frame protectors and rear axle are all mounted already, so you can start building up your custom JEFFSY right away. The installed parts correspond to the JEFFSY CF Pro Race.

The frame. As a YT, JEFFSY’s mission is to be the most gravity-ready bike of the entire trail bike segment. Therefore, we equipped it up with our award-winning Virtual 4 Link suspension technology which combines excellent off-the-top sensitivity, ample mid-stroke support and a progressive ending stroke. V4L does not only give you the confidence you’ll need for big gaps and rugged terrain but also makes pedaling super efficient and JEFFSY a very effective climber.


Shock length (eye to eye) 230mm
Seatpost diameter 31,6mm
Steertube tapered
Rear axle 12 x 148
Bottom bracket GXP Pressfit Boost 92mm
Postmount 180mm

Thanks to the flip chip technology, JEFFSY’s geometry can be perfectly adapted to different terrain and to your style of riding. The low position gives you a more aggressive headtube angle and a bigger BB drop – perfect for quick and grimy downhill sections. The high position provides a smaller BB drop, so you can blast trails and tight turns with more ground clearance.

Our prized Virtual 4 Link suspension technology is present on JEFFSY as well; sensitive, progressive, with lots of mid-travel support. This does not only give you the confidence needed for big gaps and rugged terrain but also makes pedaling a lot more efficient. The tube walls are thicker in critical areas to make sure the frame can handle the abuse, and integrated protectors keep the downtube and chain stays out of harm’s way when the action heats up.

Sizes   S   M   L   XL  
A Toptube length  573 mm 602 mm 625 mm 648 mm
B Reach  410 mm 435 mm 455 mm 475 mm
C Stack  587 mm 601 mm 614 mm 623 mm
D Seattube length  410 mm 450 mm 480 mm 520 mm
E Chainstay length  430 mm 430 mm 435 mm 435 mm
F Headtube angle  66 / 66,5 ° 66 / 66,5 ° 66 / 66,5 ° 66 / 66,5 °
G Seattube angle (eff.)  74,5 / 75 ° 74,5 / 75 ° 74,5 / 75 ° 74,5 / 75 °
H BB Drop  12 / 5 mm 12 / 5 mm 12 / 5 mm 12 / 5 mm
I Wheelbase  1142 mm 1173 mm 1204 mm 1228 mm
J Headtube length  95 mm 110 mm 125 mm 135 mm
K bb height  344 / 350 mm 344 / 350 mm 344 / 350 mm 344 / 350 mm
standover height  708 mm 737 mm 752 mm 782 mm

Warning! The maneuvers shown were done with professional riders on a closed course. Please do not attempt.

The bikes pictured may differ in certain details from the stock model and may feature optional equipment available at extra cost. Any information about delivery, appearance, dimensions and weights of bikes is provided without obligation and is subject to errors as well as printing and typing mistakes; furthermore we reserve the right to make any changes. No rights can be derived from incorrect information.