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Serfas STX Inertia 700c Road Tire
Serfas STX Inertia 700c Road Tire
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Serfas STX Inertia 700c Road Tire 3
Serfas STX Inertia 700c Road Tire 4

Serfas STX Inertia 700c Road Tire

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Mfg PartNum:
rating(9 customer reviews)
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MSRP: $60.00
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Description

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%.

    Specifications

     

    Threads Per Inch: 120 

     

    Tire Type: Clincher-Folding 

     

    Wheel Size: 700C/29" (ISO 622) 

    700 x 25mm - Black

    Weight: 242 grams

    Tire Width: 25mm (1.0in) 

    Mfg PartNum: STX-25 

    Reviews

    Ordered by Most Relevant First
    5 stars
    4 stars
    3 stars
    2 stars
    1 stars
    (3)
    (3)
    (0)
    (0)
    (3)
    (33%)
    (33%)
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    (0%)
    (33%)
    Awful brand tires
    rating
    by Lewtus
    Colorado
    1 of 1 customers found this review helpful.

    I've tried several tires from this brand and have had terrible luck the flat. The weather crack after a few months handle terribly and fall apart. They're actually dangerous. I don't recommend them at all. I've tried these in the 25 mm and they were somewhat easier to mount to the rim but these are not good tires.

    Reviewed 2/19/2023
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    Worst investment
    rating
    by Johnny
    El Paso,Texas
    1 of 1 customers found this review helpful.

    With barely 200 miles on them.One tire side wall ripped and the the other one just kept getting flats.

    Reviewed 9/1/2022
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    Serfas Tires
    rating
    by j
    Competitive Racer
    El Paso,Tx
    1 of 1 customers found this review helpful.

    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.

    Reviewed 8/25/2022
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    good tires so far, slightly undersized
    rating
    by Anonymous
    Cycling Enthusiast

    Replaced a well used Continental GP4000sII with this tire and so far so good. While both tires were nominally 25mm, the GP4000sII mounted on my HED Belgium C2 rim (18mm inside width) measured just over 27mm wide while the STX Inertia measured just over 25mm. I suppose with today's wider rims as the sizing standard, the Inertia is spot on for a 25mm. But if you're used to older tires' sizing, the Inertia is basically the same sizing as some 23mm tires I used to use, e.g. the Vittoria Rubino Pro III Slick. The Inertia 25mm is narrower than the more modern Vittoria Corsa G2.0 25mm tire I have on the front wheel, which measures over 26mm on the same model rim.

    Ride quality has been good--I'm not noticing comfort issues with the slightly narrower rear tire with slightly higher pressure. I haven't ridden in the wet (and I don't intend do) so I can't comment on wet traction.

    The Inertia exhibits tiny imperfections when spun, unlike the Conti and Vittoria tires I compared them to that look perfectly round, but I'm not noticing it while riding.

    I'd rate it a good value when on super -duper sale , ok at regular sale price, look elsewhere at MSRP.

    Reviewed 12/9/2023
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    Really worth trying
    rating
    by CRANKANDSTEIN
    Cycling Enthusiast
    Atlanta, GA
    4 of 4 customers found this review helpful.

    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.

    Reviewed 9/14/2022
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    Good tire/Good Price
    rating
    by Simon Wood Writer
    Cycling Enthusiast
    3 of 3 customers found this review helpful.

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

    Reviewed 7/29/2021
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    Easy on, but not puncture resistant
    rating
    by dpk
    Cycling Enthusiast
    Portland, OR
    5 of 8 customers found this review helpful.

    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.

    Reviewed 8/2/2021
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    Great tire
    rating
    by Jim
    melbourne FL
    2 of 3 customers found this review helpful.

    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

    Reviewed 12/3/2021
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    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
    rating
    Cycling Enthusiast
    Bend, OR
    5 of 9 customers found this review helpful.

    see summary

    Reviewed 8/2/2021
    Was this review useful to you? Yes/No
    Thank you for your feedback.

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