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27" tire PSI limits

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27" tire PSI limits

Old 11-26-13, 07:49 PM
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Originally Posted by rekmeyata
I'm not sure I understand you. The size of wheel combined with the a fat MTB tire, in your example is 26" which is as tall as a 700x23, but I wasn't talking about those two types of tires, and even if I were the size is the same from the ground to the top of both tires, thus whatever point you're trying to make is moot. The point of having chainring size change would be if you have two wheels, with tires, one would be say 27" and the other say 20" and to get the same speed from a similar performing cyclist riding each bike would require a different gear ring size on the smaller one so he can keep up with the larger wheel/tire cyclist, thus the weight of the larger chainring would off set the weight of the reduced size wheel/tire combo.

My point was the comfort issue more than anything else since I know so little about the other stuff, so I found this to help explain that more than I did: https://sheldonbrown.com/650b.html
You're both making the same point: If effective tire diameter is the same, then it will have no effect on gearing. If they're different, then it will.

The mistake you made was referring to the difference in "rim" diameter, as opposed to overall "tire" diameter, as an 8mm reduction in rim size (27"/630 to 700c/622) can be made up for by increasing the tire size by 4 mm radius/8 mm diameter; for example, 27x1 1/8 to 700x32c. They're both about 686-687 mm total tire diameter.

Last edited by JiveTurkey; 11-26-13 at 07:55 PM.
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Old 11-26-13, 09:16 PM
  #52  
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Originally Posted by William I am
I . And I'm running 27x1-1/4 tires now, not 1-1/8, so I essentially have 35mm tires now.

I'm inclined to get these, since I have them in the 27x1-1/4 size https://www.niagaracycle.com/categori...ipe-steel-bead
27x1 1/4 = 32mm. I mention it so your calibration is not off, although I doubt you'll have a problem fitting a 35mm on the U-08. you may just get something bigger than expected.

The Michelin looks like a solid choice. I'm pretty sure that's what I put on a friend's mixte when I updated it for her. That was the best choice the LBS stocked in 27".
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Old 11-26-13, 10:10 PM
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Originally Posted by sunburst
27x1 1/4 = 32mm. I mention it so your calibration is not off, although I doubt you'll have a problem fitting a 35mm on the U-08. you may just get something bigger than expected.

The Michelin looks like a solid choice. I'm pretty sure that's what I put on a friend's mixte when I updated it for her. That was the best choice the LBS stocked in 27".
Haha, whoo-oops. I fixed the SAE number but not the metric. I had 27x1-3/8 and changed that, but not the 35 to a 32. Thanks for catching that.
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