I have a 1985 Murray Phoenix high tech racer. It has 26 X 1 3/8 tires. I want to switch it over to mountain bike tires. How would I do that?

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    Doubt there is room for a mtn tire on that bike – paparazzo Apr 20 '17 at 14:01
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    Also, note that decimal and fractional tire sizing is not equiv. -- if a tire is sold as 26 x 1.5 and 26 x 1 1/2, they are likely not compatible. – Batman Apr 20 '17 at 14:02

26x1-3/8 is ISO diameter 590. Common Mountain bike tires are ISO 559. I'm not aware of any 1-3/8 tires that are knobbies, and the only way you're putting Mountain tires on that would be to change the rim or wheel. The problem you'll run into with that is the brakes won't be lined up and there may not be a brake that will reach the rim. Long answer short: No.

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