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FRESH OFF THE PRINTING PRESS --
09/19/2026

FRESH OFF THE PRINTING PRESS --

Ride 3 of my UTAH Road Trip

Aftermath.    They still worked too.  It was sliding all over getting locked in but it clicked just fine when I got it.
09/13/2026

Aftermath. They still worked too. It was sliding all over getting locked in but it clicked just fine when I got it.

Fire on the Rim 2026To everyone asking how today went... it was a war of attrition, a massive breakthrough, and a master...
09/13/2026

Fire on the Rim 2026

To everyone asking how today went... it was a war of attrition, a massive breakthrough, and a masterclass in how small variables stack up.

Operational Data:
Official Gun Time: 2:57
Recorded Moving Time: 2:30
Stationary Lockdown Time: 0:27

While the clock logged 27 minutes of total downtime waiting for severe quad cramps to release, the real time penalty was paid on the moving clock. Limping through sections where I normally lay down maximum power easily cost another 30+ minutes of lost pace.

Tactical Ex*****on (The Mud Advantage):
Last night a very serious monsoon came through. The pictures are from last night. It turned sections into heavy Arizona clay, and I knew that was my massive tactical advantage. It wasn’t about being "better," it was about equipment readiness.

My fat bike frame is designed for 4.8-inch tires, but running 2.6-inch racing tires gave me maximum clearance. I could slice right through thick sludge where standard mountain bike chainstays and forks jam up completely. I used that advantage to carve down the Strawberry Bobsled, which looked like someone roto-tilled the trail in the storm, and passed nearly 20 riders. Honestly, I would rather ride down a bobsled made of donkey turds than what was out there today.

The Catch:
My legs were cramping so violently my right foot was flailing everywhere except where I wanted it to be. Once I finally clipped in, I took off and blasted past everyone who was stuck digging clay out of their rear triangles. I made it to the bottom on pure grit, only to have most of them pass me right back over the next 5 minutes as my quads locked up solid on the next climb.

The Course & The Formula Mistake:
Let’s be real: this course has a sh*tty personality. It’s relentless, brutal, and something I would never choose to ride on a normal day. Also, you CAN'T! The worst uphills and downhills are all on private property, so it's not a course you can get used to or properly train on. I ride mountain bikes for fun, not self-torture! Because I only hit that terrain 3 times during race prep, the brutal nature of the trail masked the real underlying problem.

I didn't break the cardinal rule of changing gear on race day. I changed my hydration formula 3 weeks ago to save 2 lbs of water weight by eliminating the frame bottle, assuming my 3-liter pack was more than enough. (It had been on EVERY other ride over 17 miles this summer!) But that change accidentally created a heavy, hypertonic mix that my gut couldn't absorb under high heat and exertion, triggering severe osmotic cramping every time I pushed hard.

Why didn't I catch it sooner? Because it only happened 3 times ALL SUMMER. Even riding in 105-degree Sedona heat 4 weeks ago didn't make me cramp! All 3 breakdowns happened in the last 3 weeks, during my 2 course preview rides and today's race.

I was sitting here wallowing in my melancholy, thinking there was just something about THAT course that had me beaten forever, when the lightbulb went off: that is the exact same window when I changed the formula. The variable was completely masked by the unique intensity of the course.

The Mental Victory:
I had to pull over at least 10 times during the race. 5 of those stops were on the trail directly behind my house, sections I hike with Andy everyday on, where I easily could have called it quits and ridden down through Andy's maze to the living room. But I knew I would never forgive myself if I gave up. Honestly the thought never was a thought. The marshall in Strawberry offered me a ride and I wish I could go back in time and say "no thank you", but I said "HELL NO, if I have to crawl across the finish that's how it's gonna be"

Right at the absolute worst part of the final uphill, the last major climb before it's 100% downhill to the finish, Metallica’s The Unforgiven randomly shuffled on. The timing was absolute perfection. I dug in, pushed past the pain, cleared the peak, and crossed that finish line with nothing left in the tank.

The Bottom Line:
I missed the real problem because 2 variables were introduced at exactly the same time. But I left everything on that mountain and proved something to myself when you refuse to quit. The hydration math is fixed, the lesson is logged, and the recovery begins now. Huge thanks for all the support!

Heres what I did this year getting ready for the race on Saturday.......    1460 miles.  176,000 vertical feet in 340 ho...
09/10/2026

Heres what I did this year getting ready for the race on Saturday....... 1460 miles. 176,000 vertical feet in 340 hours.

Climbing 176,000 vertical feet translates to 33.33 miles straight up into the atmosphere.
​Here is how that physical elevation gain translates relative to major global landmarks and scale benchmarks:

​6.06 Mount Everests: Equal to stacking Mount Everest end-to-end from sea level to summit (29,032 ft) more than six times—or completing 15.3 full summit pushes starting from Everest Base Camp.

​5.03 Commercial Airliner Flight Altitudes: Over five times higher than the standard cruising altitude of a commercial jetliner (~35,000 ft).

​121 Empire State Buildings: Equivalent to stacking New York's iconic skyscraper tip-to-tip 121 times (1,454 ft to the spire).

​64.8 Burj Khalifas: Stacking the world's tallest building in Dubai (2,717 ft) nearly 65 times.

​35.2 Grand Canyons: Climbing out of the Grand Canyon from the Colorado River to the South Rim (~5,000 ft vertical gain) over 35 consecutive times.

​53.6% of the Way to Space: Passing through the entire troposphere and halfway up through the stratosphere toward the Karman Line (the boundary of space at 328,084 ft / 100 km).

Testing the rekons for the race.   I think I love these tires!!!   Turned the bike from a jeep crawler into an audi allr...
09/02/2026

Testing the rekons for the race. I think I love these tires!!! Turned the bike from a jeep crawler into an audi allroad. Super fast. Super trustworthy on corners. Excellent braking. All smiles now. The race prep over the past 6 months is over. I just need to do it now.

It's official now.  Registered for the bike race, Sept 12, 2026.  I will post my Garmin live GPS link here at 7:15am, 15...
08/28/2026

It's official now. Registered for the bike race, Sept 12, 2026. I will post my Garmin live GPS link here at 7:15am, 15 minutes before start time, on Sept 12th. You can participate my watching the link, showing up at the finish line, or donating to my fundraising page for the race here ---

mark walker's Fundraising Page.

CRASH! 🌲💥Took a nasty spill clipping a tree going around a corner. I was doing what I was supposed to do, sighting my ex...
08/22/2026

CRASH! 🌲💥

Took a nasty spill clipping a tree going around a corner. I was doing what I was supposed to do, sighting my exit but lost track of my spacing and went from 13 MPH to 0 in 0.15 seconds (according to the Garmin, which picked up the impact).

The timing could not have been "better" actually. I’m in the final, highest-volume round of training during the hottest, most brutal humidity of the year. To anyone who says Arizona is a "dry heat": you have NO idea what happens when a monsoon storm gets trapped in the forest and starts evaporating!

Luck was on my side with the schedule, too. I had to shift my Saturday ride to Sunday anyway to pick up our dear friend Marianne from the airport tomorrow. Normally moving a key ride around is a headache. after this hit, it’s a blessing in disguise.

After passing 100,000 vertical feet of climbing this spring and grinding out big miles from Utah up to the Rim, I’m sitting on roughly 100 miles of training left before the Fire on the Rim race on Sept 12th. With Andy acting as my head personal trainer, keeping me on track with daily warm-up and recovery hikes, I’m already closing in on 200,000 total vertical feet climbed this year, which matches my entire total for ALL of last year.

All I have to do is finish what I set out to do, and I will start this race as a winner no matter what unfolds. But make no mistake: I don’t plan on just going for a "bike ride." This time, it’s MY turn. Those who have followed the journey this year know the difference. Those who are used to my failings or my back-of-the-pack finishes... well, you’re in for one hell of a surprise.

Leadville 100 participant Charlie Hagan famously said, "If you don't enjoy the journey, you will not enjoy the race." I forgot that last year, and I paid severely. This year, I made sure to live it every single mile.

Time to heal up, dial it in, and finish this. See you at the finish line.

Thunder DOG goes to Thunder Mountain!
07/21/2026

Thunder DOG goes to Thunder Mountain!

Sometime a trail comes along and changes your life. NO NARRATION, ...

The first ride of my epic road trip goes LIVE at 8AM this morning!!!!Come join me on this wonderful, fun adventure as I ...
07/12/2026

The first ride of my epic road trip goes LIVE at 8AM this morning!!!!

Come join me on this wonderful, fun adventure as I plunge 3400 feet from the top of a ski resort to the bottom of a golf course!

The WOW Trail in Park City UTAH is a 9ish mile downhill ride that f...

IN FOUR DAYS, the return to the motherland begins! UTAH!Last time I visited, it was a recon mission—all scouting, data c...
06/15/2026

IN FOUR DAYS, the return to the motherland begins! UTAH!

Last time I visited, it was a recon mission—all scouting, data collection, and long hours behind the wheel. I caught a glimpse of what Moab and the middle-of-nowhere backcountry had to offer, but this time? This time, the rubber is hitting the dirt for real.

I’m swapping the "recon" for total immersion. First stop: Richfield to tackle the legendary Spinal Tap—a massive shuttle-access downhill trail. Honestly, it’s the mountain bike equivalent of the ultimate snowcat skiing trip I always dreamt of but didn’t have the engine for… until now.

I’m coming in strong, and I’m documenting the whole thing. Get ready for a new video series dropping soon, packed with all the red dirt, questionable trail-side shenanigans, and mandatory post-ride milkshakes. I couldn't decide if I wanted to run the fat wheelset on slickrock trail or not, so I will probably do BOTH. The practice loop at sunset with the fat wheels and the full course at sunrise on the 29er plus setup.

Here is my last trip smashed into a 2 minute edit with my brother Andy as Executive Producer. He is happily stepping back into that role for this production too!

https://www.youtube.com/watch?v=MWNl0k1a6k0

In 2020, I went on a 2400 mile road trip. Starting in California, ...

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