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How wide a tire will fit my bike?

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How wide a tire will fit my bike?

Old 04-05-16, 01:24 PM
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How wide a tire will fit my bike?

I have a 2016 specialized crosstrail comp disc.
It came with 700x38c tires but i'm not sure of the wheel diameter.
I would like the option of going on some dirt trails and so want to put on the
widest tires that will fit the rim with hydraulic discs.
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Old 04-05-16, 03:13 PM
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I think that the only sure test is to borrow the exact tires that you are considering and test fit them on your bike. I've been surprised at places where bigger than stock tires can rub. It's a good idea to shift into your granny chainring with the test tires installed. I've had otherwise acceptable tires rub on the front derailleur.

I have no way of knowing what kind of dirt trails you are considering but 38 mm = about 1 1/2 inches. That's wide enough to handle quite a bit. You might not be under tire'd now.
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Old 04-05-16, 03:16 PM
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It's going to be very difficult to say as some tires measure larger than their rating indicates. Some also measure smaller than their rating indicates. I highly suggest you find a LBS with a fitting room so you can find something specific to your needs.
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Old 04-05-16, 03:48 PM
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Measure the width of the tires on the bike, then measure how much clearance there is. That will give you a ballpark idea.
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Old 04-06-16, 03:46 AM
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To measure the diameter of a wheel: Hold the wheel verically and measure the distance from the axle to the floor. That's the radius, and think back to High School geometry and calculate the diameter. Or you can simply add 622+38+38 and get a rough estimation of 698mm.

Since the forks and stays get wider towards the bottom, you can fit a wider tire of a smaller diameter. Since it is a disc bike you have no problem with brake reach.
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