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MAXXISOff-RoadDirt/MX

Maxxcross SI

A competition-bred motocross tire built for soft-to-intermediate dirt — loam, sand, and berms are where this thing lives.

MTC8.2/10★★★★☆Dirt/MX · Soft-Intermediate Specialist
MAXXIS Maxxcross SI motorcycle tiremotorcycletireco.com
BrandMAXXIS
TypeOff-Road / Dirt/MX
FitmentFront & Rear
Sizes9
Soft-to-intermediate compound formula delivers race-validated bite in loam, sand, and moderately packed dirt
Anti-flex bridges on side lugs lock knobs in place under hard cornering load — no fold-over, no guesswork
Aggressive knob geometry maintains consistent traction from the first lap to the last
Robust construction resists premature wear across practice sessions and full race weekends
Available in 80/100-21 front and 110/100-18 rear — standard sizing for most modern motocross and off-road bikes
Race-validated design backed by real competition use at the pro and amateur level
Select Size

Prices use MTC dealer formula · Load/speed index explained in the FAQ below

Fulfillment

Live pricing · Walk-in mount & balance available

🛞 Running a spoked wheel? Moose Offroad Medium Duty Tubes fit 60/100-14 — from $10
Save below MSRPIn-stock · ships fastWalk-in install
MTC Rating
MTC Score
8.2/10
★★★★☆
Best suited for motocross competitors and weekend off-road riders who spend their time in dirt — not pavement
Performance
Dry Grip8.7
Wet Grip4.5
Street Manners2.0
Track Capability8.9
Mileage7.8
Value8.4
Best For
Motocross Competitor
You're lining up at local and regional MX events and need a tire that hooks up in soft-to-intermediate track conditions without folding under pressure. The Maxxcross SI is built exactly for this — consistent corner grip, stable braking bumps, and enough durability to get through practice plus race day without swapping rubber.
Perfect Match
Off-Road Trail Enthusiast
Weekend trail rides through varied terrain — loam one minute, sand the next — demand a tire that can adapt without quitting early. The Maxxcross SI's knob design handles the transitions well, and the durability holds up through a full season of recreational abuse without needing constant replacement.
Great Match
Dual-Sport Street Rider
If you're spending meaningful time on pavement, this is the wrong tire. The Maxxcross SI is a dedicated dirt tire — put it on asphalt and the knobs will chew down fast while the ride gets sketchy. For mixed-surface riding around Orange County, look at a purpose-built dual-sport tire like the Dunlop D606 or Pirelli MT21 instead.
Consider Dual-Sport Alternative
Full Size Chart & Part Numbers
Pos.SizeLoad/SpeedP/NMFR Part #UPC-AOur Price / MSRP
FrontOOS60/100B14870-8051TM198100004717784501666
FrontOOS80/100-210312-0560TM001002004717784519821$83.67$105.00Save $21
FrontOOS90/100B21870-8055TM899470004717784501734
RearOOSN/A870-8056TM103760004717784501895
RearOOS100/90B19870-8062TM879160004717784501765
Rear110/100-180312-0562TM002149004717784519913$88.51$111.00Save $22
RearOOS110/90B19870-8064TM787240004717784501826
RearOOS120/90B19870-8066TM791080004717784501871
RearOOS90/100B14870-8058TM262750004717784501925
Frequently Asked
This tire is dialed in for soft-to-intermediate terrain — think loam, sand, and light-to-moderate hardpack. It shines on motocross tracks and open trail systems with those conditions. If you're riding primarily rocky hardpack or dry, concrete-like soil, a harder-compound tire would serve you better.
No — this is a dedicated off-road tire, full stop. It carries no DOT rating and the knob pattern was never designed for pavement. Running it on the street will destroy the knobs quickly and compromise handling in ways that aren't safe. If you need street capability alongside dirt performance, we can point you toward proper dual-sport options.
Most recreational off-road riders get a solid season out of a set with regular weekend use. Motocross racers can typically get through multiple race weekends before knob wear becomes a concern. The anti-flex bridges help the side knobs hold their shape longer than designs without them. Hard-packed riding and aggressive throttle use will shorten that lifespan.
They're physical connectors between the side lugs that prevent the knobs from folding over laterally when you're leaned over hard in a corner. When knobs stay upright and planted, the contact patch stays consistent — you get predictable grip instead of that squirmy, rolling-off feeling. The benefit carries through the tire's wear life, not just when it's fresh.
The 80/100-21 is the standard front size on the vast majority of motocross and off-road machines, while the 110/100-18 covers most rear applications. Always cross-reference against your owner's manual or the sidewall of your current tire — running an incorrect size affects handling, clearance, and safety. When in doubt, call us at (714) 516-9059 and we'll help you confirm fitment before you order.
It punches well above its price tag. Premium flagship MX tires might deliver marginal gains in very specific conditions, but the Maxxcross SI covers the soft-to-intermediate range that most amateur racers and trail riders actually encounter. You're getting legitimate race-tested performance without paying a premium for diminishing returns — which is why the value score on this tire is one of its strongest numbers.

Maxxis Maxxcross SI Tires in Orange County — MTC

At Motorcycle Tire Center in Orange, CA, we stock the Maxxis Maxxcross SI for the off-road and motocross riders across Orange County who need a competition-proven dirt tire — not a compromise. Whether you're racing weekends in the surrounding desert or tearing up local trails, the Maxxcross SI's soft-to-intermediate compound and anti-flex knob design deliver the traction and durability that serious off-road riding demands. We carry both the 80/100-21 front and 110/100-18 rear to cover the most common motocross fitments.

We sell the Maxxcross SI below MSRP, and if you bring your bike or wheels to our Orange shop, our walk-in mount and balance service has you back on dirt fast — mount is $69 per tire, balance is $9.95, and disposal is $3.50. No appointment necessary for most installs. Riders from Irvine, Anaheim, Mission Viejo, Huntington Beach, Fullerton, and Newport Beach stop in regularly because we know motorcycle tires and we carry the right inventory.

One thing we'll be straight with you about: the Maxxcross SI is a dirt-only tire. If you're riding pavement between trail sections or commuting on the same bike, this is not your tire — and we'll tell you exactly what is. Questions about sizing, fitment, or whether the Maxxcross SI is the right call for your riding style? Call us at (714) 516-9059 or walk in and talk to someone who actually rides.

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