Oliver Cooper’s head-turning raw Shonky AL has been doing the rounds on social media for a while now, so please forgive us if you’ve already seen this epic pump track/dirt jump bike. Oliver is an engineer in the aerospace composites industry and he also has a natural love for fancy lightweight things, and also loves riding pump tracks. This freaking radical sub 20lb pump track bike is the culmination of those three things. “I didn’t go full Dangerholm though, but it’s pretty close.”

“The bike is a rocket ship. I know that term is overused, but it really does apply here. If you ever see me at the Whatcom Falls pump track here in Bellingham, you can take it for a lap.”


The 2019 steel Shonky frame formed the base of Elliot’s new build. A second-hand set of Race Face Turbine cranks found in a shop parts bin get the bike moving, while an old set of One Up alloy pedals keep his feet in the right place. A black KMC half-link chain connects the direct mount 32t chainring to a 15t cog out back.
A 15t Chris King cog that is… Mounted to a Chris King SS rear hub slammed forward in the bikes sliding horizontal dropouts.  
Up front you’ll find a fresh RockShox Pike DJ.
The wheels are handbuilt by Wide Open, and are Stans Flow MK3’s laced to Chris King ISO hubs, wire bead Maxxis DTH tires round out the wheel package.
Dirt jumpers do not seem to be that worried about braking and that’s reflected in Elliot’s choice of the base model SRAM Level brakes and a 140mm rear rotor.

“One of the most interesting parts on the bike are the composite wheels. Not because they are anything special, but because you rarely see them on dirt jumpers. The advantage of extremely stiff wheels becomes apparent mid corner. You can push into them super hard and instead of that energy being wasted bending your wheels it rockets you out of the corner. Due to the lower rotational inertia of the rims and wimpy tires the bike changes direction really fast too.”