Post up your tire/drive clearance pics!- Mtbr.com
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  1. #1
    Dr Gadget is IN
    Reputation: wadester's Avatar
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    Post up your tire/drive clearance pics!

    Here's a 2011 Fatback with 100mm rims and Larry tires at 8-9psi - in granny 1st of a 3x9. The ruler is decimal inch, so the tire to frame/forkclearance ranges 0.3-0.4", or 7 to 10mm. Driveline clearance is, mmmmm - BigFatZero.

    Post yours up!
    Attached Thumbnails Attached Thumbnails Post up your tire/drive clearance pics!-img_1634s.jpg  

    Post up your tire/drive clearance pics!-img_1635s.jpg  

    Post up your tire/drive clearance pics!-img_1636s.jpg  

    This isn't a "you're doing it wrong" topic.

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  2. #2
    How much does it weigh?
    Reputation: Borgschulze's Avatar
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    Lube your chain.

    I've got only a Middle Ring.. almost no point in showing a photo of my bike. It clears with decimeters of room...

  3. #3
    Dr Gadget is IN
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    Quote Originally Posted by Borgschulze View Post
    Lube your chain.

    I've got only a Middle Ring.. almost no point in showing a photo of my bike. It clears with decimeters of room...
    I use krytech dry lube after a thorough wash. If it was wet lubed it'd have grinding compound aaaaallll over it - rather than just a little dust.

    So what if you've got tire/rim inadequacy - small wheel syndrome - prove it!

    Ideally the pics in here should be tied to the tire/rim width chart in the FAQ thread, which includes Endos on Marges.
    This isn't a "you're doing it wrong" topic.

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  4. #4
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    What kind of clearance does the chain have in the next two low gears while in the granny?

  5. #5
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    Quote Originally Posted by Schmucker View Post
    What kind of clearance does the chain have in the next two low gears while in the granny?
    I tried to find the narrowest clearance, and sighted across the inside of both runs of the chain to measure. Knowing that I need to have about 6-7mm clearance, I measured:

    Low Ring:
    1 = 0
    2 = 1.5mm
    3 = 2.3mm
    4 = 3.5mm
    5 = 5.5mm

    Mid Ring:
    1 = 5.7
    2 = 7.6

    So maybe a 2X9 will work as well as what I've got - if not, 2x8 looks good. Definitely gonna have to lose the inner ring position.
    This isn't a "you're doing it wrong" topic.

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  6. #6
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    Reputation: bighit's Avatar
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    I will repost mine here.
    2013 mongoose Fat bike
    2012 Moonlander.

    http://undergroundvelo.proboards.com/

  7. #7
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    24 x 3 inch on a 29'r frame.
    Attached Thumbnails Attached Thumbnails Post up your tire/drive clearance pics!-r1-05173-0003.jpg  

    Post up your tire/drive clearance pics!-r1-05173-0004.jpg  


  8. #8
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    This is probably not the perfect place to post this question. So apols in advance.

    I'm toying with the idea of getting a Middleburn Uno crankset, and a Phil Wood 100mm BB (hopefully for a 2012 fatback). Then running this in a 1x10 set-up. I'd like the option to run a BFL on 90mm rims. So I'm looking for max chain clearance. The PW BB comes in symmetrical, or R+5 versions. I'm guessing the single speed cranks are designed for symmetrical BBs. But the unsymmetrical would buy me 5mm (at the expense of chainline). I'd be running 165mm crank arms, so I'd have a better chance of clearing the chainstay on the NDS.

    Any thoughts, or damnations?

  9. #9
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    Quote Originally Posted by onecogshortofacluster View Post
    24 x 3 inch on a 29'r frame.
    What's your pedal/ground clearance on that setup?

  10. #10
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    Quote Originally Posted by slimhazy View Post
    What's your pedal/ground clearance on that setup?
    3 inch clearance. I can leave a pedal print and a foot print in the snow.

  11. #11
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    Quote Originally Posted by Smallfurry View Post
    This is probably not the perfect place to post this question. So apols in advance.

    I'm toying with the idea of getting a Middleburn Uno crankset, and a Phil Wood 100mm BB (hopefully for a 2012 fatback). Then running this in a 1x10 set-up. I'd like the option to run a BFL on 90mm rims. So I'm looking for max chain clearance. The PW BB comes in symmetrical, or R+5 versions. I'm guessing the single speed cranks are designed for symmetrical BBs. But the unsymmetrical would buy me 5mm (at the expense of chainline). I'd be running 165mm crank arms, so I'd have a better chance of clearing the chainstay on the NDS.

    Any thoughts, or damnations?
    I'm going to try to give you some feedback AND redeem you by turning this into a drivetrain-clearance photo post.

    First, a couple of clarifications for discussion's sake: The 100mm designation on the Phil bb is referring to the housing, which is sized to fit the shell on the bike. The standard Phil spindle length for that housing (the one that shows up in their web store) is 145mm. However we realized, in a recent discussion on another thread, that Phil will make the spindle length any size you want, to "well over 155mm" long.

    I'm pretty sure you DON'T want to order the offset version of that bb for a bike with a symetrical rear end. (I think I read in a thread somewhere that Mark, at Wildfire, used to use an offset crank on his later symetrical frames, but would reverse it. But I think that had to do with the 160mm hubs.) Don't forget that you can adjust ANY Phil bb 5mm side-to-side either way, and this will buy you a lot of options.

    Of course, every frame and crankset combination will give you different results, but here is my V1 Mukluk with a 145mm Phil Spindle and a triple Race Face crankset, with the bb adjusted a couple of mm toward the drive-side. (FYI, Chain is in Small/Large (9spd) combo, and there is about 5mm of clearance between chain and Larry. Chain in the middle ring bumps it to almost 10mm of clearance. Rim is a Large Marge, so that helps in this case.)

    But notice that the non-drive-side crank arm has minimal clearance to the chainstay. This will be your problem with an offset bb! (On the other hand, I set a midleburn crank on top of the race face crank in the third picture, and it's design does look like it would fit better, even if your 165mm length is irrelevant.)

    If I were to do this again, I would have ordered a longer spindle and, only then, maybe the 5mm offset. That would make it easier to fit the BFL - possibly without even giving up any gears. Just need to do some math to figure out what will work best.
    Attached Thumbnails Attached Thumbnails Post up your tire/drive clearance pics!-img_6840.jpg  

    Post up your tire/drive clearance pics!-img_6841.jpg  

    Post up your tire/drive clearance pics!-img_6842.jpg  

    We still hang bike thieves in Wyoming [Pedal House]

  12. #12
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    Brilliant answer!
    Thanks.

    Interesting to see that the crank length is irrelevant for chainstay clearance on a fat frame

    I've now ordered a raceface Atlas set-up. Partly because I simply like ext bearings, but also due to cost. The chainline is somewhat adjustable with this set-up (not much though), and I can run my single front ring either side of the main spider. All this is irrelevant if the chainline becomes too far off, to use the biggest sprocket anyway.

    (I will post a pic of the chainline, when the bikes done, for further redemption)

  13. #13
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    Quote Originally Posted by iamkeith View Post
    Just need to do some math to figure out what will work best.
    You said Math.

  14. #14
    I'm a Target Too.
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    Mukluk Mk. I, Big Fat Larry on 80mm GFS rim, RaceFace Atlas crankset w/X-type BB:



    I moved all of the spacers to the driveside of the BB and removed the 12T cog from the cassette. The tire is 120 tpi, new and unridden, over-inflated to 30 psi and currently has a bit of a wobble, which I hope will decrease once ridden. The photo shows the tire as it passes nearest the chain. There is approximately 3x the clearance shown most of the way around.
    Last edited by cendres; 10-20-2011 at 08:12 PM.

  15. #15
    It aint gonna ride itself
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    2010 9:Zero:7 chain clears a Big Fat Larry on a 70mm UMA II rim with an Origin 8 Sub Compact 2x9 crank on FSA Platinum DH with E-Type front derailleur and all 8 cogs in back. Wheel trued 2mm left of center.

    <a href="https://www.flickr.com/photos/mababo/6285733311/" title="907 Chain Clearance by Uncle Bicycle, on Flickr"><img src="https://farm7.static.flickr.com/6098/6285733311_4a8a77c8db.jpg" width="500" height="375" alt="907 Chain Clearance"></a>

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