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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 04-28-06, 08:32 AM   #1
No_Minkah
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Do Kevlar-belted tires slow you down?

I rode Conti Duraskins all winter, and they've held up great. But on a whim I recently picked up some simple rubber tires sans-Kevlar (Kenda Koncepts to be precise) on the cheap, and I feel much faster than I did in the Duraskins. Do kevlar-belted tires really slow a body down, or is this a tire placebo effect? Both tires were 700x23, inflated to max pressure. Hollaback, girls.
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Old 04-28-06, 08:38 AM   #2
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Originally Posted by No_Minkah
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Dope.

Also, I doubt it. I feel way zippier on Kevlar-belted Michelins than I do on nonbelted Continentals.
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Old 04-28-06, 08:38 AM   #3
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Yes and no. I've had mixed results with reinforced tires. For example, the Bontrager Race Lite Hard Case tires (with multiple points of reinforcement, a kevlar belt being one of them) are most certainly not fast tires. On the other hand, Conti GP 4000s are made with Vectran, a material 6 times harder than steel and more effective than kevlar. They are quite nearly the most supple foldable tires out there.
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Old 04-28-06, 08:47 AM   #4
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Totally depends on the tire. Not all kevlar is slow, but the ones that are slow tend to be kev.

Grab a bag of popcorn, a lawn chair, and a 40, and head over to the commuter forum and you'll hear debates on durability vs. speed/road feel of every tire you can think of.
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Old 04-28-06, 09:19 AM   #5
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If you have access to a scale, weigh the two tires.
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Old 04-28-06, 10:15 AM   #6
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If you have access to a scale, weigh the two tires.
+1, that's what I'm thinking.
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Old 04-28-06, 10:57 AM   #7
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do you think the weight is the most important factor? I was thinking there might be a difference in the rolling surface area, i.e. kevvies flatten out more on the pavement.
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Old 04-28-06, 11:07 AM   #8
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A tire with a kevlar belt rolls faster than a tire with a puncture. That's what I go by.
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Old 04-28-06, 11:13 AM   #9
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Rdrr.
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Old 04-28-06, 11:51 AM   #10
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There are definately more factors too it. Rolling resistance is one. I can also think of tire pressure, tire width and diameter. But, from first glance I would think that a Kevlar belted tire (not beaded) would weigh a bit more than non Kevlar tire. That is why I suggested to weigh the tires.

I am fortunate. I work in a lab in a food plant. I can accurately weigh anything from a grain of sand to a semi. I weighed my 29er tire yesterday because I am converting to homemade tubeless. The manufactures spec is 570g. My calibrated scale at work says 640g.

So even if you look up the manufactuers spec, they are only a guidepost.
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Old 04-28-06, 12:22 PM   #11
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make sure you guys are clearing up the difference between kevlar belts and kevlar beads.
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Old 04-28-06, 12:36 PM   #12
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I think I mean Kevlar belts, as are found in my Gatorskins and Duraskins.
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