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Saturday, 14 January 2017

Tech Talk: Focus Jam

Focus Jam
FOCUS have launched the JAM in both an aluminium and a carbon frame, featuring identical geometry and typical FOCUS trademarks like the large cable entry on the left side of the head tube. Developed in-house in Stuttgart, the carbon fibre chassis isn’t just super stable, but also lightweight at just 2.060 g (size M). One of the key design elements of this frame is the muscular front end, where the top tube seam- lessly flares into the head and down tube. Boost 148 and Boost 110 hub standards ensure stiffer and more stable wheels.

When it comes to its geometry the FOCUS JAM promising fun with its slack 66.8° head angle, long frame (reach 44 mm in size large) and short 425 mm chainstays. FOCUS paid particular attention to achieving a balance between the reach and the stack, which means the bigger frame sizes don’t just have a longer top tube but also a longer head tube.

The Guide and Main link
F.O.L.D. stands for Focus Optimized Linkage Design, and there’s essentially a multi-link rear end design with two rockers (the guide link and the main link), which FOCUS claim are responsible for a number of advantages. The system is divided into two main steps, known as its two-way travel arrangement. Within the lower 30% of travel, the system works degressively for super sensitivity, thereby eliminating micro-bumps and generating immense grip. For the remainder of the travel, the spring rate is progressive, keeping firm in its travel and delivering a lot of feedback.

2 phase kinematic shock
The core of the F.O.L.D. design is the one piece rear triangle with no bearing linkage in rear end, which results not only in massive weight savings but also significantly minimizes the unsprung weight. The linkages are made up of the wider outer Guidelink that connects the rear triangle in while maximizing rear end stiffness, and then the inner Mainlink that controls the shock’s movement. Everything is positioned closer to the center of the bike and lower for a lower center of gravity to deliver improved handling. The new suspension layout has the added benefit of sheltering the pivots and suspension hardware more behind the seattube and out of the way of mud spray for more long-term durability. On the seatstay bridge of the rear triangle, Focus has included a removable front derailleur mount that lets the bikes be cleanly built up with either 1x or double drivetrains.




Highlight:

  • F.O.L.D suspension technology
  • Run 1x or 2x drivetrain
  • Internal route for cables
  • Can add 1 bottle cage in the downtube
  • Boost axle spacing



Glossary:

Toptube: The top tube connects the top of the head tube to the top of the seat tube.

Downtube: The down tube connects the head tube to the bottom bracket shell. 

Chainstay: The chain stays run parallel to the chain, connecting the bottom bracket shell to the rear dropouts

Headtube: The head tube contains the headset, the bearings for the fork via its steerer tube.

Seattube: The seat tube contains the seatpost of the bike, which connects to the saddle

Seatstay: The seat stays connect the top of the seat tube to the rear dropouts




Source:
http://enduro-mtb.com
http://www.mtb-mag.com
http://www.bikeradar.com
https://www.bikerumor.com


Ride On!



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