The legend of El Mono Loco - A 1992 Specialized Stumpjumper

The legend of El Mono Loco - A 1992 Specialized Stumpjumper

There are just some bikes that maintain an aura of being iconic and timeless. These select bikes are lusted after in buy/sell/trade markets and also have entire social forums dedicated to their preservation or stylization factor. The vintage 90s Specialized Stumpjumpers definitely fall into the category of iconic and timeless bikes. For me, these Stumpy's hit the same soft spot as 90s Toyotas and a Game Boy Color paired with Pokémon Gold. As a 90s consumer, these items write the story of my childhood and later adult life. The only difference now: my parents can't tell me how to spend my money. — Mad Monkey

Finding this legend. 

This ’92 Stumpy was brought into the family second-hand on Feb 28, 2023. We gladly paid $300 to the kind owner who listed the bike locally on Facebook Marketplace. At the time, it was Steph's first quality bike, and we had a goal to get her into cycling as an extension of outdoor exercise and to prepare her for our planned bikepacking trip to Africa in Jan 2025.

This 34‑year‑old steel frame began its journey in pearl white and was spec’d out with a retro‑mod Shimano Deore 1x10 conversion. We believe the bike is a Small frame, as it measures at 18" seat tube length, 22" top tube length, and 28.5" standover height. This makes it a rather rarity in itself, as most of these frames sold were Med, Lg, and XL to accommodate the masculine‑dominant cycling subculture.

During the first years of owning the bike, we fell in love with the versatility, durability, and comfort of the vintage geo. It's just so easy to ride and always puts a smile on the rider’s face. Being a steel frame, we did not have to worry about aluminum or carbon failure, so when I dropped the bike on the porch handrail and dented the downtube, there was no sweat off my shoulders. Or the time when my mom got in a head‑on collision with a road biker who was bombing a hill with a blind corner and decided to cut into her lane for a chance to shave a millisecond off his Strava record... all was well, and the bike took the trauma with ease.

Being a smaller frameset, this makes for a rather whippy and very responsive riding experience. The 26" wheels make acceleration very easy, checking the box for a perfect café cruiser or bar‑hopping rig, as there is minimal effort to get going in a city's stop‑and‑go environment.

But nothing in life is perfect. After riding the bike for a year, we had some good feedback on what "needed" to be changed to fit the category of long‑distance bikepacking in comfort. Two main topics that kept coming up were the tire width and the odd gear ratio created by the retro‑mod 1x10 drivetrain. The step between gears 8 and 7 was very dramatic, and under loaded conditions this became more of a problem in pedal consistency and quality shifts. You never felt in the right gear, as it was always too much resistance or too little, and this really threw off the user's cadence during longer rides.

In April 2024, we abandoned the idea of using the Stumpy for bikepacking and began looking for a bike designed with modern bikepacking DNA, greater tire‑width allowance, and a modern gear ratio for loaded rides. Steph ended up landing on a Surly Karate Monkey. We reached out to QBP and got a frameset sent over to our local shop, and began building the new bikepacking rig, which we took to Kenya in Jan 2025.

Rebirth

On July 2024, Stumpy was cast to the side of the garage as a spare for when family and friends came over for a visit, and slowly received less and less attention/maintenance. As the trips/events of 2025 came and passed, we began to really dive deeper into building out the Mad Monkey identity, association with the sub‑culture of custom cycling, and the makers creating quality, intentionally built components.

In Aug 2025, we debuted Mad Monkey at MADE in Portland and had a very successful show with the help of everyone on the Mad Monkey team. In December, we contacted the Sea Otter Classic staff to secure a booth space for the spring 2026 festival.



I wanted to build a new display bike for Sea Otter, something that actually represented Mad Monkey’s core values and the friendships we’ve built in the industry over the last two years. But the more I sketched ideas, the more I fixated on a dark truth I discovered in cycling. Us cyclists own way too many bikes. Owning ten bikes isn’t sustainability. It’s consumerism. For those who know the story of Mad Monkey, we have built this company with minimalism as our main goal, reducing our waste and space to an acceptable cottage‑company footprint of 10'x10'. We have no plans to change that mindset now or in the future, so the question truly was: is the right move to commission a “new” display bike, or should I make the less impactful choice and utilize something we already own.

I think what we chose is clear, and that brings us back to the 1992 Specialized Stumpjumper!

Our goal was to create a one‑of‑a‑kind build, proving that repurposed soul can outshine the “new.” Through a collaboration with six master component makers and one artist, we transformed this legend into El Mono Loco.

Spec Sheet:

This is our way of paying homage to all things great, artistic, and fun. We wanted a bike that viewers look to and smile. The old riders remember rolling this bike off the showroom and taking it down their first mountain trails. The younger riders lust over the summation of retro mods like the lustful 1x11 drivetrain, 165mm cranks or the Ti bullmoose bars. And the ones who see through it all, who look past the noise and into the soul of our Stumpy, understand that this is more than a bike. It’s a piece of functional art, meant to be experienced in motion.

Thank you for taking the time to learn a little bit more about Mad Monkey. We hope this build inspires others to create with the dusty canvas they have sitting in their garage and to keep soul and passion in the things that once made you happy.

A huge shoutout to:

  • Paul Components - Hands down the most elegant components on earth.
  • Sim-Works - Thank you for bridging the geographical gap to get us these cool imports.
  • Madrone - You all rock!! The Jab derailleur? Bomb proof and smooth. The fact that can be converted to any drivetrain for $20... Lets Go!!!
  • Onyx - So quite you forget your on a bike. We easily snuck up on some zebras in africa thanks to your amazing hubs.
  • Old Man Mountain - You all know your these are the best racks on earth. To find a rack from the 90s was a cool history lesson.
  • BTCHN' - Tyler, Jade & The Team inspire us in so many ways! Keep setting the bar high, and make them ride fast ;)
  • Luminary Optix - Your skills with the laser is unmatch. Thank you for helping us with all the crazy projects.
  • Revolution Bicycles, Arcata - Thank you for all your knowledge on 90 bikes and having sharp drill bits at the shop. 
  • Redding Adventure Hub - Helping us source the final touches was a huge weight off our shoulders. Thank you for building the bike culture in Redding.

Again Thank you all for helping us make this build possible & Please don't forget to support your local bike shops :)

Come see this bike in person at MADE 2026.

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