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  1. #1
    Stubby-legged
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    650b wheel radiis/diameter ?

    I need a baseline to determine if an investment is warrented. Can someone measure their rear wheel for me?

  2. #2
    nothing relevant to say
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    Manufacturer states about 703mm for NeoMoto 2.3. You'll see the same number from a knobby 700x43c or a 26x2.6"

  3. #3
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    I did a quick rough measurement this a.m. and got around 27.7" - again this was very rough and quick with the wheel still on my bike. Blunt rim paired up to a 2.2 Wolverine.

    Not scientific at all but a rough number for you to work off of if it is helpful.

  4. #4
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    Comparing rim bead seat diameters. From Measuring Bicycle Rim Sizes

    622 mm 29'er
    584 mm 650b
    559 mm 26'ers

    650b rims are 25mm larger, nearly 1 inch.

    On average you need 1/2 inch more fork and frame stay radial clearance for 650b over a 26 inch wheel with tire. Tire heights vary for any width. In other words a 2.2 wide tire of one model may have a different overall tire height above the rim than a different model, even within the same manufacturer.

  5. #5
    NedwannaB
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    Yeah just like it varies in size for different 26 & 29" models. These "can someone measure their tire to see if one will virtually fit my frame" over the internet.

    Rims play a big part too! I have a pair of 2.1 Neos, one mounted on an Alex XD Lite and the other on a Laser Disc Trail back wheel. One had +5mm clearence on the stay braces, the other scrubbed them. The Nevs were pretty consistant. Not dissn the Pacenti at all just haven't mounted my Wolv to a rr wheel yet to see if they vary.
    Wait whuuut, who did he tell you that!?!?....

  6. #6
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    Quote Originally Posted by JMac47 View Post
    Rims play a big part too! I have a pair of 2.1 Neos, one mounted on an Alex XD Lite and the other on a Laser Disc Trail back wheel. One had +5mm clearence on the stay braces, the other scrubbed them.
    Rims play a big part in tire width. The difference in height in your example should be about 1mm, not over 5mm.

    http://forums.mtbr.com/wheels-tires/...th-756818.html

  7. #7
    NedwannaB
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    Educate me then

    Quote Originally Posted by craigsj View Post
    Rims play a big part in tire width. The difference in height in your example should be about 1mm, not over 5mm.

    http://forums.mtbr.com/wheels-tires/...th-756818.html
    Being of the Engineer backround you seem to have most all the answers. So what's 5mm in say "Carpenter" speak, 1/4"? Since that's what it is/was.

    Anyway I was speaking more of noticing a variable in circumfrence/diameter/radius in same size tires from same manufacturers not so much in rim differences, which I doubt the two are too much different in configuration.
    Wait whuuut, who did he tell you that!?!?....

  8. #8
    Stubby-legged
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    Thanks for the info everyone.
    I had "Duh, what a Dufus I am" moment.

    How many times have I seen 27.5? God, how dull have I been lately!

  9. #9
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    What are you trying to convert anyway 1spd1way?

  10. #10
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    Quote Originally Posted by JMac47 View Post
    Anyway I was speaking more of noticing a variable in circumfrence/diameter/radius in same size tires from same manufacturers not so much in rim differences, which I doubt the two are too much different in configuration.
    That sounds right.

  11. #11
    NedwannaB
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    Right. Wait.....

    Quote Originally Posted by craigsj View Post
    That sounds right.
    Whaaaaa.....without any icons I can't tell if you're really agreeing or what. But thanks anyway. Does this mean you're going to lighten up on us 650B geeks?
    Wait whuuut, who did he tell you that!?!?....

  12. #12
    Stubby-legged
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    I have two Cannondale superV frames. Circa 1995 or 98. One frame I'm building into an uberV. Longer travel, Jeckyl swing arm. The other I just picked up, elevated swing arm (alum not carbon).
    LBS says I'm a sucker for old bikes.....

  13. #13
    Stubby-legged
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    Does a Mani sherman fit a 650b? I think a camo version would be killer on the uber!

  14. #14
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    I have a 2001 Jekyll in my garage right now. It is a Jekyll 900 I believe - the one with the Volvo team color paint scheme. It was donated to a group I'm involved in called CTBikeshare. There's no chance that a 650b rear wheel/tire combo is going to fit on this 2001 era rear end.

  15. #15
    Stubby-legged
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    MMcG, that's funny. I stripped a vovlo crackanfail for the lefty and the swing arm.
    Bummer on the no-go rear swing arm. I may still have a lefty 650 wheel built.

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