Two ProTaper rear dirt bike tires standing upright on a Utah gravel trail with Wasatch foothills in the background, hero image for an MXT-04 vs SMX-04 tire comparison for e-motos and gas dirt bikes.
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ProTaper MXT-04 vs SMX-04: Which Tire to Run on Your E‑Moto or Dirt Bike

ProTaper MXT-04 vs SMX-04: Which Tire to Run on Your E‑Moto or Dirt Bike

 

If you ride in Utah, you already know the truth: traction isn’t just about power—it’s
about tread choice for the terrain you actually ride. Hardpack, loose-over-hard, gravel
roads, foothills trails, and track days all ask different things from a rear tire.


In this guide, we’re breaking down two popular ProTaper rear options—MXT-04 and
SMX-04—so you can pick the right tire for your setup, whether you’re on an e‑moto
or a gas dirt bike.

  • Choose MXT-04 if you want a more dirt/track-focused tire that prioritizes drive and
    bite in loose-to-mixed conditions.

 

  • Choose SMX-04 if you want a more versatile option that prioritizes predictable grip
    and stability on firmer ground.

Shop the tires here:

ProTaper MXT-04 Rear Tire (100/90-19)

ProTaper SMX-04 Rear Tire (100/100-18M/C)

 

Why tire choice matters on e-motos and dirt bikes

E‑motos deliver instant torque, which can:

  • Break traction faster on loose-over-hard
  • Wear knobs quicker if you’re spinning on hardpack
  • Make a “good enough” tire feel sketchy under braking or corner load

Gas dirt bikes are more progressive in power, but Utah terrain still
punishes the wrong tread—especially when trails go from hardpack to marbles to rock
in the same ride.

ProTaper MXT-04: What it’s best for

Think of the MXT-04 as the pick for riders who want a tire that feels at home when the
ride gets more dirt-forward.

Best for:

  • Loose-to-mixed terrain
  • Riders who want strong drive under acceleration
  • More aggressive trail riding and track-style conditions 

Utah use cases:

  • Foothills trails with loose sections
  • Mixed dirt where you need the rear to hook up when you roll on power 
  • Riders who prioritize “bite” over long-life cruising 

ProTaper SMX-04: What it’s best for

The SMX-04 is the pick for riders who want a tire that feels predictable and stable when
the ground firms up.

Best for:

  • Firmer terrain and hardpack
  • Riders who want consistent cornering feel
  • Mixed riding where stability matters more than pure bite

Utah use cases:

  • Hardpack trails and gravel connectors
  • Riders who want a planted feel when conditions are fast and firm 
  • E‑moto riders who want stability under braking and corner load

How to choose in 60 seconds

1) What’s your most common surface?

  • More loose dirt / mixed trail: MXT-04
  • More hardpack / fast firm trails: SMX-04

2) Do you ride an e‑moto with big torque?

If you’re on an e‑moto and you’re constantly breaking traction, prioritize the tire that
gives you the most predictable stability for your terrain. If you’re riding more
dirt-forward routes, you’ll still want that hook-up when you roll on power.

3) What do you care about more: bite or stability?

  • Bite-first: MXT-04
  • Stability-first: SMX-04

Setup tips

Tire pressure is terrain- and rider-dependent, but here are safe, general guidelines:

  • Start with the manufacturer’s recommendation for your bike and tire.
  • If you’re getting deflection or harshness on rocks, you may be too high. 
  • If you’re getting rim hits or squirm, you may be too low.

If you want a dialed setup for Utah terrain (and your bike’s weight), BHive can help you
choose the right tire and get it installed correctly.

Why buy your tires from BHive (West Jordan, UT)

Tires aren’t just a part you click “add to cart” on—they’re a setup decision.  When you buy through BHive Moto Shop, you get:

  • Help choosing the right tread for Utah terrain
  • Fitment guidance (size, clearance, riding style) 
  • Local support and service if you want install help

FAQ

Which ProTaper tire is better for Utah hardpack?

If most of your riding is firm and fast, the SMX-04 is a strong choice for predictable
stability.

Which ProTaper tire is better for loose dirt and mixed trails?

If you want more bite and drive in dirt-forward conditions, the MXT-04 is the better pick.

Do e‑motos need different tires than gas dirt bikes?

Not always, but e‑motos are often heavier and deliver instant torque, so tread choice
and pressure setup matter more for traction and wear.

Can BHive help me choose the right tire?

Yes—tell us what you ride and where you ride in Utah, and we’ll point you to the best
option.

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