Mountain Bike Tires: Which Width and Tread for LA Trails?

Key points

• The right mountain bike tires for LA trails come down to three choices: width for the terrain, tread for the dirt, and pressure for grip.
• Tubeless is close to essential on our loose, rocky fire roads, since it lets you run lower pressure without pinch flats.
• Bike Improve stocks the tire brands worth trusting and sets them up tubeless on a wheelset built for the load.

Shop Mountain Bike Shoes at Bike Improve

Short answer: for most Santa Monica Mountains trail riding, run a 2.3 to 2.4 inch tire with a fast-rolling center and biting shoulder knobs, set up tubeless, at a pressure in the low 20s psi adjusted to your weight. That combination handles our dry, loose, rocky terrain better than almost anything that came stock. I set up tubeless mountain bike tires every week, so here is how to pick width, tread, and pressure for the way you actually ride.

What tire width should you run on LA trails?

Width is the first decision, and it should follow your riding style and your rims. A narrower tire rolls faster and accelerates quicker, while a wider tire floats over rock and gives more grip and cushion at lower pressure. Our dry, chunky Westside fire roads reward a little extra width for traction and pinch protection, but going too wide adds weight and drag you will feel on every climb. Match the tire to the internal rim width too: a light M32 rim pairs with a fast cross-country casing, the all-round M35 suits a true trail tire, and the wide M42 is built for plus-size rubber. Here is the quick guide.

Riding style	Tire width	Tread	Starting pressure
Cross-country	2.2 to 2.35 in	Fast center, low knobs	Mid 20s psi
Trail	2.3 to 2.4 in	Balanced, biting shoulders	Low to mid 20s psi
Enduro and gravity	2.4 to 2.6 in	Aggressive, softer compound	High teens to low 20s psi

Treat those pressures as starting points and adjust to your weight and how hard you ride.

How do you choose mountain bike tire tread?

Tread is where a tire earns its keep. Look at three things: the center knobs, the shoulder knobs, and the rubber compound. Low, closely spaced center knobs roll fast and quiet, which you want on long fire-road climbs. Tall, widely spaced shoulder knobs bite when you lean the bike into a loose corner, which is where most crashes actually happen out here. Compound is the trade-off nobody mentions: a softer rubber grips better and wears faster, while a harder compound lasts longer and rolls quicker but slides sooner on dry dust. For our terrain, a faster center with an aggressive shoulder is the sweet spot, and many riders run a grippier front tire with a faster-rolling rear to get cornering bite without killing their climbing.

Build a Tubeless Wheelset for Your Tires

Should you run tubeless mountain bike tires?

On LA trails, yes, and it is not close. Tubeless lets you drop pressure for grip and comfort without the pinch flats that ruin a ride on rocky terrain, and the sealant plugs the small punctures our dry, thorny brush loves to hand out. You lose the tube, save rotating weight, and gain traction, which is why every wheelset we build is tubeless ready. The setup does need doing correctly, with the right tape, valve, and sealant volume, and that is a ten minute job at the bench that saves you a lot of trailside swearing.

What mountain bike tire pressure should you run?

Pressure is the free upgrade almost everyone gets wrong. Too high and the tire skips over rocks instead of gripping them, beating you up and reducing traction. Too low and you risk burping air or denting a rim. Tubeless is what lets you run those lower, grippier numbers safely. As a starting point, a lighter rider on a trail tire might begin in the low 20s psi and a heavier rider in the high 20s, then adjust a pound or two at a time until the tire feels planted without wallowing. Run a touch less in the front for grip and a touch more in the rear for support. We will help you dial a baseline at the shop.

What are the best mountain bike tire brands?

We stock mountain bike tires from Maxxis, Continental, Schwalbe, Pirelli, and Vittoria, chosen because they cover the real range of tread patterns, widths, and compounds our riders need. The best brand is less important than matching the specific casing and compound to your terrain and weight, which is the conversation we have with every rider. Pair the right rubber with a properly built tubeless wheelset and a dialed pressure, and the same bike will climb quicker and corner with far more confidence.

Hot take: Most riders run 5 to 10 psi too much. They inflate to the number on the sidewall, which is a maximum, not a recommendation, and then wonder why the bike feels harsh and slides in corners. Drop your pressure into the low 20s on a tubeless setup and the tire finally does its job. It is the cheapest performance gain in mountain biking, and it costs nothing.

New to the trails here? Our guide to trail bike riding near West LA covers where to ride and how to set the rest of the bike up.

Where can you get tires fitted in West LA?

Bring your wheels or the whole bike to Bike Improve at 10927 Santa Monica Blvd in Westwood, between Westwood and Veteran. We will match the tire to your terrain, set it up tubeless, and dial a starting pressure so you leave ready for the dirt.

Call Bike Improve at (310) 400-0363