Trash to Trail: How I Turned a Free ’90s Mountain Bike into a Custom Gravel Rig

https://youtu.be/nLp7jWf2USo?si=sOzLxYN7qUluCJgU

I’ve heard it said a million times in the cycling community: “A modern gravel bike is basically just a 1990s mountain bike with drop bars.” I’ve always wanted a gravel bike. Something practical for commuting but rugged enough to tackle some weekend dirt trails. However, I refused to pay $4,000 for one. So, I decided to put that '90s mountain bike theory to the test.

Here is the story of how a free, abandoned bike became one of my favorite custom builds, and why you should absolutely try building one yourself.

The Roadside Rescue

The project started purely by accident. I was driving through a neighborhood and drove right past an old bike leaning against a tree. It was a vintage Univega. An aluminum 703 mountain bike with quick-release wheels.

I literally put my truck in reverse, backed up, knocked on the door to be sure I could take it, and threw it in the bed.

At first glance, someone had already slapped some roadie-style tires on it, but the bones were all '90s mountain bike. I brought it home, put it on the stand, and made it my mission to turn this piece of roadside trash into a drop-bar gravel machine.

The bike had 90s vibes for sure. I almost didn't want to paint it, but glad that I did.

The Teardown & The Bottom Bracket Nightmare

I went into this with zero professional bike mechanic experience. I stripped the entire frame down to the bare metal, which sounds easy until you hit the bottom bracket.

If you are new to bike building, let me save you some pain: there are English bottom brackets and Italian bottom brackets, and they thread in opposite directions. I convinced myself I had an Italian one. I spent entirely too much time tightening the bottom bracket while trying to take it off. By the time I realized my mistake, there was barely enough thread left to loosen it the correct way. When that thing finally popped off, the relief was real.

What it looked like before Dad helped me get it off.

Sanding, Painting, and "Forking" Up

Because my SoCal Biking brand colors are orange and black, I initially mocked up a few designs in those colors. But knowing this was my first build, I didn't want to mess up a complex paint job. Instead, I took inspiration from the gorgeous green on the new Trek Checkpoint.

I found a perfect Rustoleum green. Following my dad's advice, I sanded the aluminum frame completely by hand (so I wouldn't accidentally grind too far into the metal with a power tool), primed it, and sprayed it. It looked absolutely phenomenal.

Did I make mistakes? Oh, yeah. I completely painted over my fork's crown race because I didn't realize it was a separate piece that was supposed to come off. I just left it on and kept moving (wait until you see my Surly bike build video...this was the cause for it).

A fresh coat of paint. Gorgeous.

The Amazon Parts Fiasco

This is where the true problem-solving began. My original dream was to use a Shimano 105 crankset I scored for $50 and build a 2x11-speed bike. I custom-ordered a rear wheel, bought the 11-speed cassette, and laid all the parts out.

Plot twist: The frame and the wheel wouldn't fit an 11-speed cassette.

Thankfully, I hadn't opened the packaging yet. I returned a massive haul of parts back to Amazon, pivoted my entire plan, and went to my local bike shop to order a Shimano CUES drivetrain instead.

Of course, I still messed up the shifters. I had picked out these beautiful, wide gravel drop bars, and then realized the shifters I ordered were meant for flat bars. If you are a seasoned bike mechanic reading this, you are probably yelling "Duh!" right now.

This was before Shimano came out with a chrome CUES, or else I would have chosen those.

Cantilevers and Cable Rubs (Enter Nigel)

I wanted to keep the vintage vibe alive, so I decided to stick with the original cantilever brakes instead of trying to convert to disc. I set them up in the narrow stance (which gives you more stopping power), but getting the tension right was a headache.

My buddy Nigel came over to help me finish the rear derailleur. Between the two of us, a torque wrench borrowed from my dad, and a lot of trial and error with the brifters and barrel adjusters, we finally got the gears shifting and the brakes grabbing.

The bike in its early stage of revival. No dirt on it at all!

The Test Ride

The moment of truth. Nigel grabbed the action cam, and I took it out to the alleyway behind my house.

I ride my carbon road bike down this alley all the time, and it is incredibly rough. But on this build? The shifting was responsive and fast, the frame felt sturdy, and those big, wide tires completely ate up the bumps. It felt totally different than my road bike. It was comfortable, capable, and undeniably fun.

An updated photo, shot back in November of 2025.

The Verdict

Looking at this green gravel rig now, I don't just see a bike. I see the time, the effort, the absolute frustration of that bottom bracket, and the massive learning curve I conquered.

Building a bike from a bare frame teaches you patience, problem-solving, and how to just go for it even when you have no idea what you are doing. If you are thinking about starting your own project, do it. You will make mistakes, and you will buy the wrong parts, but the feeling of riding a bike that you built with your own two hands is unlike anything else.