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I own a Giant Revel 29" 2015 which has 2.1" wide tires. I want to go wider.

What's the maximum size of tire that I can put on these rims?

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    The limit isn't the rims, the limit is the frame and brake mechanisms. – Daniel R Hicks Feb 24 '17 at 12:54
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    Do you have rim or disc brakes? With rim brakes you want the tyre still to pass through the opened brake so you don't have to deflate the tyre when taking out a wheel. – Christian Lindig Feb 24 '17 at 14:33
  • I am sure this is a duplicate, but cannot find the question. Its also a very common question that can and should be more generic than a particular bike (which makes not difference) – mattnz Feb 24 '17 at 21:07
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The Giant bike specs page says nothing about tire clearance. You can measure it yourself:

  1. Measure mounted tire width at widest point.
  2. Measure distance from wide tire points from #1 to frame/fork.
  3. Considering a (very arbitary) minimum 1cm clearance for 29er, choose a suitable tire.

For example, if current tire is 53mm wide and clearance at each point is 1.5cm, about 1cm wider tire might fit (about 2.3"). Keep in mind that tire width will vary from claimed depending on manufacturer and your rims inner width. You should also factor in riding conditions, especially amount of mud. And make sure that new tire will fit into rim brakes, if that's what the bike has.

You might find it easier to visit a local bike shop and find a suitable wider tire together. Just fit something bigger and see if clearance is good enough.

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