Cycling Equipment · Public discussion

Yipes! Tire choices!

Started by Mike Jacobs · · Last activity · 5 posts · 1,019 views

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Cycling Equipment
Published
11 March 2007
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20 March 2007
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Mike Jacobs
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  1. Last week I put Continental Ultra Sport (700/25C) road tires on my hybrid (Trek 7700) Bontrager Select wheels for a couple of upcomming charity century rides but have seen 2 deep slashes in just 120 miles (about half on a smooth course and half on highways).

    LBS is great and I'll always support them if the price isn't too far off, but they don't have the selection of online stores.

    The choices are endless, it seems. I'm looking for a good balance between low rolling resistance and high slash resistance from glass (punctures not so much). I've also just learned that there are size options too! My research has just multiplied the questions lol...

    I would be very appreciative if somebody could provide a primer on selecting materials *and sizes* for a "relatively heavy road bike" (I'll put the hybrid tires back on for the trail rides).

    TIA!

  2. I like the Schwalbe Marathon Plus tires.
    I have recently come to the conclusion that I have a higher overall speed (and enjoy riding more) if I don't have to stop and fix flats, than I do if I run ultra-light racing tires.
    I don't ever enter actual races, though....

    I don't know anyplace (on-line or off) that stocks all the sizes. I have to internet-order mine from Schwalbe North America.
    ~

  3. Really skinny tires look racey. You have to use more air pressure with them or you'll pinch flat. Ultra high air pressures make the bike ride like a truck and it bounces around more on the road. Some people think that the harsh ride and bouncing around feel faster. Skinny tires have less frontal area so they are definitely more aero. I use 700 X 23 tires on my go-fast bike and 700 X 28 on my retro grouch bike and tandem. I use less air pressure than anybody I know.

    For low rolling resistance you want a nice supple sidewall and a thin tread so the tire won't consume as much energy when it flexes as the contact patch moces around it's circumference. I've seen race-only tires advertised that were listed as lasting for only 800 miles. The popular puncture resistant belts are a negative factor relative to rolling resistance.

    Also, if everything else, including air pressure, is equal, a slightly wider tire will have lower rolling resistance. That's because a wider tire will have a shorter contact patch from front-to-back. Since the contact patch is shorter, the tire has to deform less and consequently consumes less energy. However, since you have to run narrower tires at higher pressure to avoid pinch flats, my bet is the rolling resistance thing will equal out.

    You can find bicycle tires with various degrees of puncture protection. Nothing is totally puncture proof. The more puncture resisting kevlar they put under the tread and sometimes in the sidewalls, the stiffer the tire carcus becomes. That increases it's rolling resistance and makes it harsher riding.

    Kevlar beads are a completely different thing than kevlar belts. The beads replace steel wires in the tire bead. That makes it significantly lighter in weight and makes it foldable so that it's easier to carry with you as a spare.

    As far as I can tell, all of the tire manufacturers distribute road tires that cover the whole range of characteristics. Everybody seems to have brands that they like and brands they avoid. The trick is to find a tire model that has the balance of puncture resistance, wearability and ride characteristics to match your bike and the kind of riding that you do.

    Road tires will generally last around 2,000 or 3,000 miles. Honestly, I can't remember the last time that I wore a tire out because I generally get a sidewall cut that compromises the tire caseing before tread wears out.

  4. Tufo C Elite Road

  5. I get whatever 25C Kevlar bead (not made in China-PRC*) is on sale & have never noticed any difference in performance. I'm not a racer. I keep pressure as rated in back & slightly over in front.

    *http://www.news.cornell.edu/stories/April05/Labor.biz.hr.China.lm.html

    http://www.organicconsumers.org/politics/walmart32905.cfm

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