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Old 09-25-11, 03:23 PM   #1
episodic
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Can I run a 25mm tire on a Salsa Delgado Cross rim for road riding? Or is 28 the min?

I've got a 32mm tire on now - and would like something a little faster for group rides. Was curious if there was a minimum?
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Old 09-25-11, 03:38 PM   #2
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You could go down to a 700x23. The Delgado is 22.5 mm wide. I'm running as narrow as 700x23 on a 23mm Velocity A23 rim.
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Old 09-25-11, 03:56 PM   #3
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Here's a guide to optimal tire width for a given width. Note it compares nominal outside tire width to actual inside rim width so use it carefully. There's plenty of room to pinch to either side of the range, especially toward the wider side.

In making your decision consider that narrow tires aren't necessarily faster, and just as in the auto/truck world, the width should be somewhat proportioned to load. Also understand that vertical flex depends on the tire cross section being shaped like an Ω. That allows the cantilevered sections to flex across their planes. When using an overly narrow tire the cross section is more like an inverted "U" and the tire will not flex as nicely.
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Old 09-25-11, 05:28 PM   #4
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From HED: "But what makes 23mm better than the ubiquitous 19mm rim? Width. Picture a standard 23mm tire on the C2 rim. Tire and rim width are the same, the sidewalls are fairly straight, and the width of the rim spreads the tread contact patch out. With straighter sidewalls, and more rubber on the road, cornering is an entirely new experience. The sidewalls don't flop over in a hard corner, and more rubber on the road is, well... better. C2s should be run with lower pressure, since there is more air volume in the wider tire profile. The same tire on a 19mm rim looks more like the profile of a light bulb. The curved sidewalls flop over under hard cornering, there is less rubber on the road, and more air pressure is needed to prevent pinch flats."

From Velocity: "The A23 rim is based off our proven Aerohead race rim. With a wider footprint, the A23 allows for a more aerodynamic rim/tire combination when paired with a 23c tire. The tire profile mimics the characteristics of a tubular, gaining increased control and lower rolling resistance without the inconvenience of tubular glue or the dangers of irreparable roadside mechanicals."

I agree that a 25 or 28 might be better for a heavy cyclist on damaged roads, but a 23 will work.
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