STX Inertia Road Folding Tire



Quick Overview

The Serfas® STX Inertia Folding Road Tire features a smooth tread constructed using our high performance Alchemy Compound for lower rolling resistance and world class grip.

Comprehensive testing at Wheel Energy® of Finland, an independent tire laboratory, found Serfas® Inertia tires to perform 8.12% better at cornering than our competitor’s most comparable best selling road bike tire.

  • Serfas® FPS Flat Protection
  • Dual Density Tread Compound
  • 120 TPI 3-Layer Casing
  • Low Rolling Resistance Alchemy Compound w/ World Class Grip



  • Utilizes Our Alchemy Compound For Lower Rolling Resistance and World Class Grip
  • FPS Flat Protection System
  • Dual Density Tread
  • Smooth Tread Pattern For Ultimate Performance
  • 120 TPI 3 Layer Construction
  • Bead: Folding
  • TPI: 120
  • Sizes:
    • 700 x 23
    • 700 x 25
    • 700 x 28
  • Pressure: 130 PSI
  • Weight:
    • 222g (23)
    • 242g (25)
    • 312g (28)

Additional information

Tire Sizes

700×23 Folding, 700×25 Folding, 700×28 Folding

3 reviews for STX Inertia Road Folding Tire

  1. Mark Solow

    I’ve been a Continental 4k, 4kS, and 4kSII fan for several years. Just put a set of these (700×25) Inertia’s on my carbon roadie after getting a sidewall blow-out on my (700×25) Conti’s. They way outperformed what I expected! The grip on corners was unmatched—which is what Conti says makes theirs faster. Plus, the ride comfort was smoother too. So, I put a set on my wife’s bike and she loves the ride too. We both think that they are faster, but can’t confirm. Could just be riding faster because we like the way they feel.

  2. Mark Solow

    Update: Have now ridden these over 1,500 miles still with good grip and no flats!

  3. Mark Solow

    Update: Over 3,000 miles. Still round. Still decent grip. Still no flats. Amazing! Unquestionably the best tire I’ve ridden in the 10 years I’ve been riding 5-6 times a week!

    • Serfas

      Mark, Great to hear how well the Intertia has and is continuing to perform for you over all those miles! Thanks for sharing your experience – The Serfas Team

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