KERN LT Enduro Platform

Our KERN platform is the essence of mountain biking. They will give you a real pedDling efficiency in climbs and will give you pleasure and adrenaline on the descent whether in 120 (KERN SL), 140 (KERN) or 160 (KERN LT).

 
 
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The Kern platform has been developed in the field with the help of our Enduro drivers through the various races of the Enduro World Series. Based on our LR / VR kinematics, it is for us the very essence of mountain biking: climbing efficiency, speed and safety on descent. The Kern are available in three strokes: Kern LT for the Enduro in 160mm, Kern for the All Mountain in 140mm and Kern SL for the Trail in 120mm.

 
 
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KERN LT FINEST

Front triangle & Alloy seat stays 6069 T6, BB92, tapered head tube, rear 142×12

Monobloc Carbon Chainststays Toray 800

Rockshox Revelation RC 130 mm 110x15mm BOOST axle
Rockshox Deluxe RT 210×50 Debonair Metric

27,5’’ – Rims Mavic EN627 Tubeless – Hubs Aivee MP2
Spokes Light Stainless steel – Tires
Hutchinson Toro 2.25 tubeless ready front & rear

Cassette SRAM NX 11 speeds PG-1130 (11-42)
Anti-déraillement E thirteen TRS+ – Manette I Shift lever SRAM GX 11 speeds
Rear derailleur SRAM GX1 11 speeds
Brakes SRAM Guide R 203 mm front & 180 mm rear
Crankset RaceFace Aeffect SL directmount 30 teeth

Handlebar RaceFace Turbine 740mm riser
Stem Alu SUNN 45 mm
Seat post SRAM Reverb Stealth handlebar remote
Saddle SUNN 5295 Cr-Mo rails

KERN LT S1

Alloy 6069 T6, BB92, conical tube, rear 142×12

Rockshox Recon Gold RL Solo Air 130mm 100x15mm
Rockshox Deluxe RT 210X50 Debonair Metric

27,5’’ – Rims SUNN Mach1 5.50SL – Hubs Aivee MP2
Spokes Stainless steel – Tires
Hutchinson Toro 2.25 hardskin front & rear tubeless ready

Cassette SRAM NX 11 speeds PG-1130 (11-42)
Shift lever SRAM GX 11 speeds
Rear derailleur SRAM NX1 11 speeds
Brakes SRAM Guide R 203 mm front & 180 mm rear
Crankset SUNN 30 teeth Narrow Wide

Handlebar SUNN Alloy 740 mm

Stem Alu SUNN 45 mm
Seat post HL Tequila Dropper seatpost handlebar remote
Saddle SUNN 5295 Cr-Mo rails

 

 
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« ALLOY » 6069

Strength (inset 1): 6069 is the most difficult alloy to break and with the best fatigue strength.

– Elastic limit (maximum force before permanent deformation)
= +25% (6061) and +15% (7005)
– Fatigue (maximum force before breaking)
= +54% (6061) and +28% (7005)
Weight: Comfort ratio (inset 2):
Alloy 6069 offers the best density/elasticity ratio.
– Density: 1% higher than 6061 and 2.2% lower than 7005
– Elastic modulus: 4.4% lower than 6061 and 9% lower than 7005

 
 

E.T. EDGE TUBING

By extending the edges from the top tube down through the seat stays and to the dropouts, we’ve improved frame dynamics:

– by reducing the effect of torque when pedalling for better efficiency of the rear wheel.
– by optimising its vertical flexibility

CONIC EDGE TUBE

The tapered shape of the head tube allows for a stiffer front triangle, meaning a more-precise ride.

A 100% integrated design that uses the edges from our E.T. concept.

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SAG WINDOW

Lateral opening for a clearer view of SAG.

We recommend the use of a shock absorber under the weight of the pilot (SAG) of 35%, so 15mm for the KERN SL, 20mm for the KERN and 22mm for the KERN LT.

 
 

CARBON STAYS

In order to meet the expectations of the most demanding of riders, we have developed a new HM Toray® T800 carbon chain stay. The monobloc manufacturing associated with our specific lay-up contributes greater rigidity necessary for large bermed corners and swift accelerations.

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KINEMATIC V.R / L.R


 

In collaboration with Antidote Solutions engineering consultants, we’ve developed new kinematics for our KERN range, based around 2 concepts: V.R. (Virtual Rotation) and L.R. (Leverage Ratio).

V.R. / Virtual Rotation: a kinematic principle of virtual pivot points.

Shape of the ICR curve:

The curve of the pivot points moves back along the length of the frame as travel increases, which is ideal for suspension balance.

At the start of travel, the front pivot points make it easier to sit into the slope and avoid ‘catapult’ effect when hitting jumps.

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KINEMATIC V.R / L.R


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L.R. / Leverage Ratio: relationship between rear-wheel travel and shock compression. The ratio constantly changes throughout the wheel’s travel range. We focused and worked on the following aspects for our Kern range:

Shape of the LR curve :

Progressive : to maintain stability throughout the travel range and to avoid bottoming out. Parabolic: to quickly lower the ratio around SAG and thereby get better support from the suspension. The relationship between suspension and SAG is important in order to avoid stability problems.

0 to 60 mm : High ratios (between 2.9 and 2.6) provide comfortable and relatively soft suspension. The progressive shape makes it easy to reach the SAG value (a ratio of around 2.65) and facilitates negative travel, which is important for the bike to move smoothly over broken ground.

60 to 120 mm : (ratios between 2.6 and 2.4) the curve is still progressive, but ratio reduction is slowed; suspension is firmer and gives better grip.

120 to 160mm : (ratios between 2.4 and 2.38) the curve bottoms out at 150 mm travel (2.37). The progressive shift in ratios from 2.9 to 2.37 stops the shock bottoming out at the end of travel. At the very end of travel, the force exerted on a pneumatic spring (air shock) increases quicker than the travel (Ramping), which means maximum travel is never reached. This is why, to compensate for the ultra stiffness of the air shock, we’ve slightly lifted the curve again at the end of travel (from 2.37 to 2.40).


 
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