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Old 10-21-07, 12:13 PM   #1
Cain
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MTB Tire Size

What's the smallest diameter tire I can put on a 26" MTB rim? The rim says 559x17. Does "17" mean the rim width is 17mm?

I typically road bike, but I have an older Rockhopper that I would like to use to pull my kid around in his trailer. It currently has really knobby 26x1.95 tires that have a lot of road resistance. I'd like to replace those tires with a smaller, smoother tire.

Last edited by Cain; 10-21-07 at 12:39 PM.
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Old 10-21-07, 01:03 PM   #2
Bill Kapaun
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17MM sounds very small for a MB rim! You should probably remove the tire and actually measure it.
I run a 26x1.5" on a 20MM rim and could go to 1.25" IF I wanted to without problem.

http://sheldonbrown.com/tire-sizing.html

Near the bottom of the page
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Old 10-21-07, 05:38 PM   #3
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Find the ETRTO number on the rim (not the one on the tire). It should be 559 x XX. There is a page on Sheldon's site that will tell you what size tires you can use.

Link anyone?
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Old 10-21-07, 06:31 PM   #4
well biked 
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Originally Posted by Bob Dopolina View Post
Find the ETRTO number on the rim (not the one on the tire). It should be 559 x XX. There is a page on Sheldon's site that will tell you what size tires you can use.

Link anyone?
The OP says the rim is marked 559 x 17. That is on the narrow end of the spectrum for a mtb rim, but I do have a couple of mtb wheelsets with rims of that width (measured between the two inside walls of the rims). I've run anything from 26" x 1.0" to 26" x 2.14" tires on them, no problems. So to answer the question, "how narrow a tire can I use?", the answer is as narrow as you want for a 26" mountain bike tire, which as far as I know don't come any narrower than 1.0 inch.

Last edited by well biked; 10-21-07 at 11:48 PM.
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Old 10-22-07, 12:46 PM   #5
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Thanks for the help. I found the link to Sheldon's site regarding tire sizing. My wife has a hybrid with 1.25" tires. I didn't know if I could even go that low of diameter. I went with some 1.5" street tires that should serve me well.
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