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Hell yeah,
I’m ready to donate!

$10 per entry.
6 entries for $50!

Want to know more about Soil Searching?

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EWS Partnership

The Trail Hunter


Soil Searching is a grassroots movement at Specialized to recognize, celebrate and support the unsung heroes of mountain biking – the trail builders and advocates.

This year, Specialized and Access4bikes are giving away a 2019 Stumpjumper Carbon with a special “Soil Searching” build. Featuring a gold Sram XX1 Eagle drivetrain, Roval carbon wheels, Ohlins suspension, Renthal cockpit, and Hope brakes, this truly is a hero’s bike. Winner to choose frame and wheel size. Scroll down for full specs.

Each $10 donation enters you to win. Donate $50 and get six entries for the price of five! Donate as many times as you want!

All proceeds go towards MTB advocacy and trail projects in the birthplace of mountain biking — Marin County — and beyond.

Winner will be announced on May 4th, 2019 at our annual Ales and Trails Festival. You don’t need to be present to win, but you should be there for the party, rides, demos, beer, food, music, trail work and overall stoke!


oh boy, would you look at These Specs!

Your Choice of frame size and wheel size: 27.5” or 29”


  • Frame: Custom Soil Searching painted Stumpjumper FSR Carbon

  • Handlebar: Renthal V2 Fatbar 800 x 20mm

  • Stem: Renthal Apex Stem 31.8mm diameter, 50mm length

  • Grips: Renthal Kevlar Compound Lock-On Grip

  • Saddles: Custom Soil Searching Waxed Canvas Henge Saddle 143mm

  • Seatpost: Command


  • Chain: SRAM XX1 Eagle, 12-speed

  • Crankset: Truvativ Descendant, aluminum, Boost™ 148, 170mm crankarm, 24mm spindle, 32T

  • Shift Lever: SRAM XX1 Eagle, trigger, 12-speed

  • Cassette: SRAM XX1 Eagle, 12-speed, 10-50t

  • Rear Derailleur: SRAM XX1 Eagle, 12-speed

  • Brakes: Hope Tech 3 E4 Orange

  • Rotors: Hope Floating Disc

  • Rear Suspension: Ohlins TXX 22M Coil 

  • Front Suspension: Ohlins RXF 36 EVO 

  • Suspension Travel: Front 150mm, Rear 150mm (27.5)

  • Suspension Travel: Front 150mm, Rear 140mm (29)

  • Wheels: Roval Traverse Carbon hookless carbon, 30mm inner width, hand-built, tubeless ready, 28h

  • Front Tire: Butcher, GRID casing, GRIPTON® compound, 2Bliss Ready

  • Rear Tire: Purgatory, GRID casing, GRIPTON® compound, 2Bliss Ready


save the date May 4th, 2019

Tickets Available now. $35 for first 100!

Your Favorite Bike & Brew Fest Is Coming!


Ales and Trails is May 4th, 2019

One of Marin’s biggest bike parties and A4B’s biggest annual fundraiser! Group rides, demos, unlimited beer tastings, live music, vendors, kid events and more. Go here for more info.

Trail Closures

Marin County Open Space occasionally closes trails due to seasonal weather conditions, maintenance or new construction. Go here for up to date info on MCOSD trails.

Please respect Camp Tamarancho trails and avoid riding during or shortly after heavy rains. For more info, go here.

Marin MTB news

Marin MTB Events

A4B & A4BF Monthly Board Meetings

Who: Everyone is welcome!

What: Discuss current topics, new trail proposals, trail work, ongoing and future projects, A4B sponsored events, finances, hear from guest speakers, learn about volunteering opportunities and more.

When: Monthly every third Monday in the back room of Iron Springs in Fairfax at 6:30 PM.