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I am interested in getting a bike with 27.5+ wheels (that could features tyres up to 3.25". I'd like to know what is the thinnest tyre I could mount on such a wheel in case I want to have more speed and less "power".

  • How wide are the rims (inside flange to flange measurement)? You should never run a tire narrower than the rim, and generally the tire should be at least 30% wider than the rim. – Daniel R Hicks Sep 30 '15 at 12:20
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I wouldn't go much narrower than 2.4 on the 27.5+ wheelset which is usually 40 to 50mm wide, maybe 2.2 if it's got 35mm wide rims as some setups prefer. Keep in mind that you drop your bottom bracket quite a bit when you size down, so you might get more pedal strikes and different handling by using smaller tires. I wouldn't go smaller than 2.4" tires on a bike designed for 27.5+ tires.

However, you could likely use a standard 29x2.2 tire on a 29er wheelset on the same bike which should be about the same diameter as your 27.5+ wheel & tire. It's a bit more expensive to have a separate wheelset, but it can give you the versatility to swap between fat and skinny widths.

  • If you swap rim widths, though, you will have to readjust caliper brakes. – Daniel R Hicks Oct 1 '15 at 2:36
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    Thanks, good answer. The point is, I am planning to buy a very expensive hub gear so I'd want to have a one wheel solution that'd be as flexible as possible by only replacing the tyre. – Dakatine Oct 1 '15 at 6:06
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The usual answer is "Which tire fits safely on which rim?" on this page: http://www.sheldonbrown.com/tire-sizing.html

  • That does not cover fat or semi-fat wheels! Like 3.5". – Dakatine Oct 1 '15 at 6:04
  • I believe the question was about narrow tires. – ojs Oct 1 '15 at 19:17

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