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Thread: Tires Sizing

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    Tires Sizing

    Hey Guys,

    I have a 2010 Kona Dew hybrid. According to the Kona website, this bike is running Rigida Cyber 10 rim and an Alex ZC-1000 both runnng 700x37c tires.

    I was wondering if you guys would be able to tell me what are the skinniest tires I would be able to safely run on these rims?

    Thanks,

    Ryan

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    Measure he outside width of the rim, add a quarter, that's just about the minimum with good profile. though, I've seen people ride smaller and do OK.
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    Okay, cool, thanks. The website of theirs says to run tires from 37-62mm, but the width is 24.5..

    Now i'm confused.

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    looks like 28mm, tho 25 at a push, but if you want to run that narrow, you really have the wrong type of bike

    http://velospec.com/components/alexrims/zc1000

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    Quote Originally Posted by Junior88 View Post
    Okay, cool, thanks. The website of theirs says to run tires from 37-62mm, but the width is 24.5..

    Now i'm confused.
    I gave you a minimum, not the optimum. Using my guideline you'd use 30mm tires or larger most likely 32mm. Here's a chart showing the ideal range. Note that it uses the rim inner width, not outer so use the right dimension. The chart is a bit conservative, and you could pinch it a size on either side.
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    Senior Member BCRider's Avatar
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    My heavy load carrier is wearing 28mm Conti Ultrasports on Alex rims that are 25.3mm wide outside. The rims were likely 25.5 when new and a match for your rims. But there's been some wear on the braking tracks. The 28's mount up, seat and have a shape that is just fine. But I sure would NOT go any narrower. The shape the 28's give is just barely acceptable to me. As it is they do round out a bit wider than the rim but only by a little. And that rounding out is needed for the carcase to get the proper shape. 25's would mount up with the sidewalls forming a "short" arc instead of a bulged out arc, if that description makes any sense. And with a shape like that you're not working the sidewalls correctly.
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    That's a 19.6mm rim, so 25 is probably the smallest you want to go. The only risk with small tyres on wide rims is higher probability of pinched flats. I actually prefer to size my rims on the wide range for any given tyre size as I find the cornering is more stable and the wear is better since the curvature at the tread is flatter. It wears across a wider portion of the tyre instead of a thin stripe down the middle.

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