Once you've got your tire on there, check the size listed on it and match it up with the sizes you've listed. Almost any 700c tire will fit on your rim, assuming that your frame has the clearance to accommodate it. As others have mentioned, the tire size is what you need. I'm assuming that when you say the "wheel" has a size of 622x15c listed on it, you mean the rim and not the tire. Over the life of the tire, this would cause my speed and mileage to be overestimated when the tire is new and underestimated when the tire is worn, but it should average out by the time the tire is replaced, assuming the tire achieves an average lifespan.Ģ% is not a huge error, but over a year's mileage for me, it would cheat me out of a longish ride's mileage (somewhere between 40 and 50 miles), at least in my records.
Cateye strada wheel size chart plus#
Schwalbe Marathon Plus tires, for example, are taller (larger circumference) than Gatorskins.ģ) Can I find a "set it and forget it" number? I could just use the figure supplied by Cateye, 2105mm, or I could interpolate and use (2124+2105)/2=2115 (rounded). But not all tires of a given size have the same circumference. Near the end of its life, the number given by Cateye turns out to be pretty close for this tire. These tires are typically good for 4000 miles, maybe 4500. With 3200 miles on the rear tire, it's squared off pretty good, and the worn unloaded circumference is about 2140mm, whereas the worn loaded circumference is around 2109mm. The loaded circumference is around 2124mm.Ģ) The tire wears over time. In my case, the unloaded circumference of a new 700x25C Gatorskin is about 2155mm.
There is, effectively, a loaded and unloaded circumference. (My computer sensor reads off my back wheel, which carries most of my weight.) So when I measure the circumference of the tire, that must be taken into account. What I found, for my bike & my weight, was:ġ) Sitting on the bike causes the tire to compress about 5mm. But, I have degrees in math, and I don't care. I tried to explain this to a friend, and his reply was "your inner nerd is showing," which is probably true. It's probably something they've considered more carefully than you might think. So if you can live with a small amount of inaccuracy, I would say that you should go with the number in the instructions that came with your computer. In actuality, it can be shown that the Cateye number (2105mm) is a lot closer to the true circumference (when a rider is on the bike, compressing the tire, and changing the effective radius of the wheel/tire and circumference of the tire) than 2155mm is. I run 700x25C Gatorskins, and the Cateye instructions said to use a circumference of 2105mm, but I was measuring a circumference of 2155mm, when the tire was inflated on my wheel. I have a Cateye Double Wireless, and I was surprised at how much the tire circumference in the instructions varied from what I was measuring and observing.
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