Push Industries has been well known for its tuning and aftermarket kits for quite some time, but when they introduced their ElevenSix shock, it begged the question: what comes next? Building a rear shock is easy. Just throw a block of aluminum into the CNC machine, pop in your favorite stack of shims, slide on a suitable spring and you’re good to go. Sure, there’s a LOT more to it than that, but a fork on the other hand requires a big investment in magnesium, that is, if you’re building a traditional fork with one-piece lows.
It might sound like an office daydream, but Push actually started prototyping the fork you see above in late 2015. The double crown inverted chassis is also driven by a linkage. Based on the Earle’s Fork patent, used on BMW motorcycles from 1955 to 1969, the main link design includes a main link arm pivot that rests on the lower leg while the dropout is attached separately. Behind the stanchions there is no mudguard, but another arm connecting the link to the upper tubes.
If you can imagine the front axle moving from the 5 o’clock position all the way to 3 o’clock, then you understand one concept of the Earles fork: an extended wheelbase. The prototype also tested the levels of anti-lift induced by the braking forces, but unlike traditional forks, it can push up the front under heavy braking. USD forks are sensitive to lateral deviation, but the Earles concept helps stiffen the steering.
We reached out to Darren Murphy at Push to see if we could get more information on this first design:
Many riders have appreciated the qualities of their Trust linkage forks and I would have loved to try the Earles concept fork myself. I’m sure Darren and his team have learned a lot during this development process, aside from the tangible projects. So, does that mean we’ll see another prototype fork from PUSH and what will it look like?
When we pushed Darren to find out more about the idea for a production fork, he was low-key about the frame construction, materials used, and timing, but went on to say: