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THE MOST UNIQUE CYCLOCROSS COURSE IN CALIFORNIA?

We think Mare Island UCX has a pretty strong argument.

Most cyclocross courses have grass, dirt, sand, and maybe a few barriers thrown in to remind you that riding your bike isn't always an option.

Mare Island?

We're sending you through a historic naval shipyard.

We're talking obstacles along the Napa River waterfront, riding beneath massive industrial cranes, and racing through concrete air raid and bomb shelters built immediately after the attack on Pearl Harbor in December 1941.

Yes, you read that correctly.

You'll be racing your cyclocross bike through actual WWII era bomb shelters.

Mare Island was established in 1854 as the first naval shipyard on the West Coast. For generations, this place was building and repairing ships that helped shape American history.

And now, over 170 years later, we're using it to see how fast people in spandex can ride bicycles around old military buildings.

Progress.

But that's what makes Mare Island UCX so special.
Every corner of this course has a story. Every turn brings something completely different. One minute you're racing along the waterfront, the next you're ducking through a concrete bunker, and before you know it you're charging beneath towering shipyard cranes.

There's really nothing else quite like it.

And with Mare Island Brewing Co. sitting right along the course, it's just as much fun to watch the racing as it is to be out there suffering through it.

We genuinely believe this is one of the most unique and most fun cyclocross courses in California.

And we're pretty sure you'll agree once you race it.
NOVEMBER 1ST. MARE ISLAND UCX.

The best urban cyclocross race in the world.

At least until someone proves us wrong.

BASP is back.

September 20 — Race 1: Shoreline Shredder
September 27 — Race 2: Vallejo Velocity
October 24 — Race 3: Surf City CX
October 25 — Race 4: Surf City CX
November 1 — Race 5: Mare Island UCX
November 22 — Race 6: Nutty Cross
December 5 — Race 7: Coyote Point CX
December 6 — Race 8: Coyote Point CX

8 races. 6 venues. No two weekends alike.

Link in bio.
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🥜 NUTTY CROSS IS BACK 🥜

California’s biggest cyclocross race returns to @ruhstallerbeer Farm in Dixon on Sunday, November 22, 2026.

Swipe through for what it actually looks like: mud, hand-ups, a kids race, live music, a relay race, beer & food trucks, and a whole lot of people not taking themselves too seriously. That’s the point. It’s hard, it’s a mess, and it’s the most fun you’ll have on a bike all fall.

🚴 Never raced cyclocross before? Your first one is FREE. Email chris@boundlesslocomotion.com to claim your entry.
🎟 Registration is OPEN! Tap the link in bio.
👇 Tag the friend who needs to stop saying “next year.”

#nuttycross #nuttycx #cyclocross

📸 credits: 
@kylethornhill 
@creedub
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