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Serfas STX Inertia 700c Road Tire
Serfas STX Inertia 700c Road Tire Serfas STX Inertia 700c Road Tire
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Serfas STX Inertia 700c Road Tire
Serfas STX Inertia 700c Road Tire Serfas STX Inertia 700c Road Tire

Serfas STX Inertia 700c Road Tire

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Dual Density Tread with Flat Protection

The Serfas® STX Inertia Folding Road Tire features a smooth tread constructed using their 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 their competitor's most comparable best-selling road bike tire.

Features:

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

  • B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.

    The product weight specified is an approximate weight based on the manufacturer's specifications (if available) or our measurement of one or two examples. For most products, the weight will typically vary by 5% to 10%.

    Tire Type: Clincher-Folding 

    Threads Per Inch: 120 

    Wheel Size: 700C/29" (ISO 622) 

    700 x 23mm - Black

    Weight: 222 grams

    Tire Width: 23mm (0.9in) 

    Mfg PartNum: STX-23 

    700 x 25mm - Black

    Weight: 242 grams

    Mfg PartNum: STX-25 

    Tire Width: 25mm (1.0in) 

    Ordered by Most Relevant First
    5 stars
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    1 stars
    (3)
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    (0)
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    (1)
    (50%)
    (33%)
    (0%)
    (0%)
    (17%)
    Reviewed 9/14/2022
    by CRANKANDSTEIN
    Cycling Enthusiast
    Atlanta, GA
    Value Rating
    Overall Rating
    1 of 1 customers found this review helpful.
    Really worth trying

    The 23mm size mounted on narrow 19mm outside width rims are accurately that wide at .9". The height is just under at .8" above the rim. The bike has 400mm chain stays, crank center to rear axle center, and these have .3" clearance to the seat tube. I figure that the 25mm size may have fit with a .2" clearance like the 25mm Gatorskins that came off, but returning to the original spec 23mm size is interestingly quick and smooth at 80psi carrying less than 160 pounds total bike and rider. Losing 190 grams of revolving weight compared to the Continental set was noticeable when accelerating up hillcrests.

    New, they took a good bit of cleaning up. The release coat was generous and crusty. That's not such a bad thing after seeing the flat black buffed up with fine steel wool. They felt like ribbon when mounting. Repeatedly working the initial bead down into the rim bottom and around to the loose side helped the edge drop over by hand. The outline had minimal wobble and runout when inflated.

    The long injection hairs are easy to pull and nick off. Logos wrap into the cornering tread. Big white SERFAS letters will act as chicken strips that scuff up in hard turns.

    All in all, these are fun, underrated tires not having a big brand name. The technology seems to be there.

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    Reviewed 7/29/2021
    by Simon Wood Writer
    Cycling Enthusiast
    Value Rating
    Overall Rating
    2 of 2 customers found this review helpful.
    Good tire/Good Price

    This is a good mid range tire at a good price. I couldn't ask for more.

    Was this review useful to you? Yes/No
    Thank you for your feedback.
    Reviewed 8/2/2021
    by dpk
    Cycling Enthusiast
    Portland, OR
    Value Rating
    Overall Rating
    4 of 6 customers found this review helpful.
    Easy on, but not puncture resistant

    I've put about 1,000 miles on it and while it's been a solid performer I would say it is prone to punctures. I've had several with very small metal wire that I would have assumed would not penetrate the rubber.

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    Thank you for your feedback.
    Reviewed 12/3/2021
    by Jim
    melbourne FL
    Overall Rating
    1 of 2 customers found this review helpful.
    Great tire

    I have over 3500 miles of paved road riding, without a flat tire, and on the rear wheel. The tire surface is getting a little flat now, so plan to change the tire within the next 500 miles

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    Thank you for your feedback.
    Reviewed 8/2/2021
    Cycling Enthusiast
    Bend, OR
    Value Rating
    Overall Rating
    3 of 7 customers found this review helpful.
    I have always been a fan of Vredestein tires because of how well they feel in high speed cornering. The Inertia tires have a very similar feel. The transition into the lean feels very smooth and the g

    see summary

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    Thank you for your feedback.
    Reviewed 8/25/2022
    by j
    Competitive Racer
    El Paso,Tx
    Overall Rating
    Serfas Tires

    I order a set of tires about month ago. I have put in around 300 miles on them. Average PSI is about 100. Rear tire wire bead started to crack and the front tire has a tear on the side wall.

    Was this review useful to you? Yes/No
    Thank you for your feedback.

    Articles will open in new tab.

    A guide to bicycle tire sizes, both standard on newer bikes and common on older bikes.
    Understanding older bicycle tire sizes.
    The different types of road bicycle tires and how to select what is best for you.
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    Tire Tips   
    Tips for proper bicycle tire mounting and tire safety.
    A guide to understanding tire width.
    A guide to understanding bicycle tire tread patterns and what you should look for.

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