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  1. #1
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    29 x 2.0 / 29 x 2.1 tyre diameter

    I'm looking into building a monstercross bike so I need to know what the rough tyre diameter/radius for a 29 x 2.0 or 29 x 2.1 is. Thanks in advance.

  2. #2
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    about 29"
    Quote Originally Posted by pvd
    Time to stop believing the hype and start doing some science.
    29er Tire Weight Database

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    Thanks but clearance is very tight so I need to be accurate and 29" is 737mm (roughly the size of most 2.3 - 2.4 tyres) and that won't fit. My current 700 x 35 tyre is 700mm and I reckon I can get away with something around 725mm. I was hoping someone might crack out a tape measure.

    If it's too big I'll just go with a 29 x 1.75 Smart Sam.

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    29 x 2.0 / 29 x 2.1 tyre diameter

    Quote Originally Posted by Hogdog View Post
    Thanks but clearance is very tight so I need to be accurate and 29" is 737mm (roughly the size of most 2.3 - 2.4 tyres) and that won't fit. My current 700 x 35 tyre is 700mm and I reckon I can get away with something around 725mm. I was hoping someone might crack out a tape measure.

    If it's too big I'll just go with a 29 x 1.75 Smart Sam.
    Then you need to specify which tire you want to use, since different manufacturers' tires with the same nominal size are actually different sizes.
    Quote Originally Posted by pvd
    Time to stop believing the hype and start doing some science.
    29er Tire Weight Database

  5. #5
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    I realise that and I don't have a specific tyre in mind. I'd just like to know if anyone, anywhere has ever measured a 29 x 2.0 tyre...Not too much to ask surely?

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    Quote Originally Posted by Hogdog View Post
    Thanks but clearance is very tight so I need to be accurate and 29" is 737mm (roughly the size of most 2.3 - 2.4 tyres) and that won't fit. My current 700 x 35 tyre is 700mm and I reckon I can get away with something around 725mm. I was hoping someone might crack out a tape measure.

    If it's too big I'll just go with a 29 x 1.75 Smart Sam.
    The BSD is 622mm. plus 100mm. (nominal size of a 2" tire) would give you a diameter of 722mm. I'd suggest that a 2" tire will be a little tight. Sorry, I don't have a 2" tire to measure for you, only a 2.25".
    The trouble with having an open mind is that people will insist on trying to put things in it.

  7. #7
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    29 x 2.0 / 29 x 2.1 tyre diameter

    Quote Originally Posted by Hogdog View Post
    Thanks but clearance is very tight so I need to be accurate and 29" is 737mm (roughly the size of most 2.3 - 2.4 tyres) and that won't fit. My current 700 x 35 tyre is 700mm and I reckon I can get away with something around 725mm. I was hoping someone might crack out a tape measure.

    If it's too big I'll just go with a 29 x 1.75 Smart Sam.
    Wrong. The 2.3-2.4 tires are around 745mm

    http://mtbtires.com/site2/tire-specs...00c-tire-specs
    mtbtires.com
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  8. #8
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    29 x 2.0 / 29 x 2.1 tyre diameter

    Quote Originally Posted by Hogdog View Post
    I realise that and I don't have a specific tyre in mind. I'd just like to know if anyone, anywhere has ever measured a 29 x 2.0 tyre...Not too much to ask surely?
    No.. nobody anywhere has ever measured a 29x2.0 tyre, and even if they had, unless you are using the same tyre, the dimension may or may not be what you find in a 29x2.0 tyre of your choice. Is that really so hard to understand?
    Quote Originally Posted by pvd
    Time to stop believing the hype and start doing some science.
    29er Tire Weight Database

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    Quote Originally Posted by shiggy View Post
    Wrong. The 2.3-2.4 tires are around 745mm

    29" / 700C Tire Specs
    Thanks, very helpful indeed.

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    Quote Originally Posted by Ronnie View Post
    The BSD is 622mm. plus 100mm. (nominal size of a 2" tire) would give you a diameter of 722mm. I'd suggest that a 2" tire will be a little tight. Sorry, I don't have a 2" tire to measure for you, only a 2.25".
    Thank you, that seems to tally with some info I found from Cateye.

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    Quote Originally Posted by meltingfeather View Post
    No.. nobody anywhere has ever measured a 29x2.0 tyre, and even if they had, unless you are using the same tyre, the dimension may or may not be what you find in a 29x2.0 tyre of your choice. Is that really so hard to understand?
    Dude, seriously, have a day off.

  12. #12
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    Quote Originally Posted by Hogdog View Post
    Dude, seriously, have a day off.
    He's right, tho. There are no real standards for how they measure tires. I've had 2.3 tires that are fatter than other mfg's 2.55 tires.

    You'll just have to buy a set with your best guess and hope they fit.

  13. #13
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    Quote Originally Posted by pimpbot View Post
    He's right, tho. There are no real standards for how they measure tires. I've had 2.3 tires that are fatter than other mfg's 2.55 tires.

    You'll just have to buy a set with your best guess and hope they fit.
    As I said before, I'm aware of that... I just needed a radius and make/model of tyre so that if it looked like it would fit I could go and buy it. It's a hell of alot easier than naming every tyre on the market individually and asking people to measure them until I found something suitable.

  14. #14
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    Quote Originally Posted by Hogdog View Post
    If it's too big I'll just go with a 29 x 1.75 Smart Sam.
    Several things out there that should fit fine. Specialized Renegade 1.95, NoTubes Crow 2.0, NoTubes Raven 2.0, Bontrager XR1 2.0, Maxxis MaxxLite 29 2.0, etc... before you drop down to something like a Smart Sam 1.75 or a Surly Knard 41mm, etc... .
    The 14 warmest years have all occurred in the 16 years since 1997.

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    Thanks Bruce, I'll look into those.

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    Quote Originally Posted by Hogdog View Post
    Dude, seriously, have a day off.
    It was a joke, but illustrated my point, which is, again, that generic 29x2.0 measurements are going to be of little to no use to you if you're splitting hairs in a tight clearance situation.
    Good luck.
    Quote Originally Posted by pvd
    Time to stop believing the hype and start doing some science.
    29er Tire Weight Database

  17. #17
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    Quote Originally Posted by meltingfeather View Post
    It was a joke, but illustrated my point, which is, again, that generic 29x2.0 measurements are going to be of little to no use to you if you're splitting hairs in a tight clearance situation.
    Good luck.
    Heh... I have a bud who wedged a 27.5 tire in back of his Turner Burner. It fit fine in the shop. We found that once he got out on the trail, the rear tire would pick up small rocks and suck them through his chainstay bridge, making a loud KLACK! as it went through. Once he hit the slightest bit of sticky mud, it was all over. The tire also rubbed against the chainstay as the wheel flexed.

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