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Arc8 extra fox36 black 2020 11 10 182009

Ready to get Rowdy Extra - Big wheels, long travel

The Extra comes alive when the terrain gets challenging. Everything on this bike is designed to boost your confidence, starting from a geometry akin to a downhill bike, over big wheels, to frame stiffness. A long reach, 64° head angle, and low BB mean all business in the front. There is still some party in the back though, with short chainstays keeping the bike alive and giving it some pop when taking off on small features.

It is easy to get to the top as well, thanks to a steep seat angle, efficient suspension, and low weight.

With our frameset, you can build it into the bike you want. Put on some sturdy tires, coil springs and a 180 mm fork, and you can go absolutely mental on this bikes. Or put on a 160 mm fork, air sprung fork and shock, and reasonable tires, and you are all set for epic days in big mountains.

Wheel Size
29"
Rear Travel
160 mm
Front Travel
160 - 180 mm
Frame Weight
2300 g
Sizes
S / M / L
Climbing
 
Rolling Trails
 
Technical Trails
 
Fast Downhills
 
Jumps
 
Extra 1 Extra 2 Extra 3 Extra 4 Extra 5 Extra 6

Tech Specs:

Geometry

Longer, slacker, lower, with short chainstays. We are not going to repeat how that concept works, because you probably already heard it a thousand times since we designed the first 29er using it before people even knew what a long travel 29er is (it earned the "best geometry in the business" comment from Dirt Magazine back then). Just let us tell you, it still works. Something almost the entire industry gets wrong about seat angle is that the seat angle matters at the height of your saddle, not of your headset. Therefore, we measure our seat angle to an average seat height of 750 mm. You don't get that "theoretically ok, but in reality much too slack" seat angle that so many 29ers suffer from.

BSA BB

Creak free, easy maintenance, not fit issues - all our frames come with threaded BBs.

Internal Cables

All cables go through the headset into the frame. This does not only offer an exceptionally clean look, it also means the cables interfere less with your steering.

Reversed Main Pivot

The swingarm goes into the seat tube rather than around it, creating a very stiff connection. We are using Enduro Max bearings, specifically designed for MTB full suspension frames.

Designed for Carbon

We do not design our frame, and then give it to a factory to make it happen in carbon. Our frames are designed with the manufacturing process in mind from the start. Only like that we can ensure a carbon structure that can be produced with consistent high quality. While the focus in the development of carbon frames very often just lies on stiffness and weight, we also put a lot of effort into minimizing the chance of manufacturing flaws like voids, wrinkles or low compaction areas. This is absolutely critical to make carbon products not only light and stiff, but also durable.

2.6" Tire Clearance

While lucky enough we did not have to go through that episode of ever shrinking "plus" tires, it left us with the great outcome that there is a wide choice of 2.6" tires. Many tests show it to be the fastest option, so making the Extra compatible to it was a no-brainer.

Offset Rear Axle

When trying to combine 29 x 2.6 tires with good chainring clearance and short chainstays, there is just not enough room for the chainstays. Luckily now there are most cranks available with an even further outboard, 56 mm chainline without affecting Q factor. To get the cassette aligned, we keep using 148 mm hubs, but offset it 4 mm to the right, which provides multiple benefits:

  • More even spoke tension
  • Less exposed brake rotor
  • Weight savings over a 157 mm hub
  • You can keep your 148 mm wheels. Redishing them by 4 mm can be done keeping the same spoke lengths (theoretical difference is less than half a millimeter)

Kinematics

The kinematics were designed with some progression to suit air and coil spring shocks. Leverage is highest at sag point for best sensitivity and a falling rate provides resistance against bottom-outs.

Geometry

Geometry enduro v1
Size S M L
Rider Height <172 173-182 >182
A Reach 447 472 497
B Stack 591 600 609
C TT 560 617 645
D ST 380 400 440
E SA 76.7 76.7 76.7
F HA 64.7 64.7 64.7
G HT 90 100 110
H Fork Offset 42 42 42
I Fork A-C 551 551 551
J CS 430 430 430
K Wheelbase 1192 1221 1250
L BB Drop 35 35 35
M Standover 682 684 682

Frame Specification

Component Specification Comment
Headset IS52/40 | IS52/40 Compatible to FSA and Prestine Headset with internal cable routing
Seatpost ø30.9 150 mm Reverb can be fully inserted on every size
Seatpost Clamp ø34.9
Rear brake Postmount 160 mm
Rear Axle 148 x 12 mm Shimano E-Thru Standard
Max. Chainring Size 38 T with 56 mm chainline
Shock Size 230 x 60, 20x8/30x8 mm Hardware Fox bearing mount on link side possible
Fork 160 mm travel max.
Tires 29 x 2.6 max On 30 mm inner width rim.
BB BSA 73 mm
Chainguide ICSG05
Rear Wheel Boost (148 mm) rear hub, 4 mm offset
Bottle One 0.5 L bottle on down tube. Sideload bottle cage required