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  1. #1
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    Bob Trailer w/170mm hub

    Want to use my Bob Trailer with the 170mm rear hub.

    BobGear has 3 different length skewers; 140, 145, 160mm, all too short.

    Anyone use the Bob with their fatty and come up with a solution?
    Cutting the rod and weld in an extension chromoly piece?


  2. #2
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    Coastkid amongst others have done this, i just googled it!

    coastrider: Fatbike Trailer...

    BOB trailer on a Fatback

  3. #3
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    Thanks Scotsman,
    I was just unusually lazy googling.

  4. #4
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    Quote Originally Posted by Flying_Scotsman View Post
    Coastkid amongst others have done this, i just googled it!

    coastrider: Fatbike Trailer...

    BOB trailer on a Fatback

    Yes, but coastkid has done it with his Pugsley which, as far as i know, has 135mm rear hub spacing.

  5. #5
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    I got my B.o.B to fit my Norco Bigfoot 6.3 (4" wide tyres with 170 mm rear hub) this way:
    1. I bought an Extrawheel bike Trailer quick release for 140 - 190 mm hubs. I removed the skewer rod and this fitted straight into a Bob skewer head. I had to saw off 20 mm off the skewer as it was too long for my 170 mm rear hub.
    2. I also got a 28 inch B.o.B fork, which was easily widened by hand, and this now fits ok although the gear cable housing rubs against the trailer fork.

    So now I can use my B.o.B on my 26" MTB as well as my Fatty with just a change of the trailer fork.

  6. #6
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    The Robert Axle Project addresses this:

    Robert Axle Project | Thru-Axles for Fat Bikes

  7. #7
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    Quote Originally Posted by Ghoulwe View Post
    The Robert Axle Project addresses this:

    Robert Axle Project | Thru-Axles for Fat Bikes
    Not exactly. Those are 12 mm thru-axles, not quick release axles.

  8. #8
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    PITA. Thi sis another reason I don't understand why there isn't a 135mm symmetrical fatbike out there. Plus all the other headaches. So many problems with 170mm spacing and so few drawbacks to 135mm, namely: 1) can't run a normal rear cassette due to chainrub. Boohoo, good riddance, I never want to use one again since derailleurs always get whacked and cause problems, 2) can't remove wheel without deflating it first, big deal, how often do you remove your wheel?, 3) may have chainrub issues on the tire, so you'll need a chainguard there, pretty easy fix IMHO, 4) MAY not be able to run full 5" tires, limited to 4", but I'm not certain about this, I'll know in a couple weeks!

    Doesn't make sense to me that no one makes one so I'm building my own in a frame building course I'm taking over the next couple weeks.

  9. #9
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    One other thing, before putting a fat tire on your Bob, test it out first with the regular one, because with my Extrawheel I found that a regular 2" tire or whatever it is worked fine on sand, and I had a lot of weight in there. No need for a fat tire. The trailer tire isn't driven and it doesn't steer so it just rides overtop of the sand just fine. Not sure if the smaller diameter Bob tire would affect this but I suspect not.

  10. #10
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    Modified my 26" trailer with an 3" piece welded in an an 197mm axle on a 170mm hub with two lockbolds




    My native language is Dutch so don't blame me for beeing incorrect

  11. #11
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    Modified my 26" trailer with an 3" piece welded in an an 197mm axle on a 170mm hub with two lockbolds




    My native language is Dutch so don't blame me for beeing incorrect

  12. #12
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    The BOB yolk could be hand stretched to fit 170mm but as mentioned there is no 170mm QR axle available. I need one of these for my Surly Wedneday bike on pre order,
    plan it...build it....ride it...love it....
    http://coastkid.blogspot.com/

  13. #13
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    I believe BOB makes an extra long QR skewer that you can adapt, I can't remember where I found it exactly but it works fine for me on my 170 QR Rohloff hub and I am using it right now.

    I expected this to be an issue and it was not, I just have to remember exactly what I did because I don't see anything like it on the website. I might have stripped parts from a similar skewer, I don't recall because I was researching about 15 problems at the same time when building this bike.

    I just hand-bent the Bob forks until they fit. That works fine.

  14. #14
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    An Extrawheel bike Trailer quick release for 140 - 190 mm hubs can be used. See my post above from 04-21-2015. Their skewer is the same style as the BoB one. Remove the Extrawheel skewer rod and add a Bob skewer head. I had to saw off 20 mm off the skewer as it was too long for my Norco Bigfoot 170 mm rear hub.

  15. #15
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    Quote Originally Posted by espard View Post
    An Extrawheel bike Trailer quick release for 140 - 190 mm hubs can be used. See my post above from 04-21-2015. Their skewer is the same style as the BoB one. Remove the Extrawheel skewer rod and add a Bob skewer head. I had to saw off 20 mm off the skewer as it was too long for my Norco Bigfoot 170 mm rear hub.
    I tried the Extrawheel quick release and it didn't fit quite fit the Bob end-cap. I had to enlarge the end-cap with a dremel order for the extrawheel skewer head to fit properly. Maybe extrawheel has changed their design a bit. I did get it to work, but it wasn't quite plug and play.
    Attached Thumbnails Attached Thumbnails Bob Trailer w/170mm hub-bob.jpg  

    Last edited by Lars_D; 10-07-2015 at 11:20 AM.
    --Peace

  16. #16
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    Looks like a good fit may depend on luck due to variation in manufacturing. I just received two Extra Wheel skewer for spares. The skewer ends are shown in the photo with a BoB end on the right. Note that there is quite a variation between the two Extra Wheel skewer ends. The middle skewer end was shorter and was "plug and play" but not the longer one on the left. Out with the tools ...
    Attached Thumbnails Attached Thumbnails Bob Trailer w/170mm hub-skewer-ends-1-copy.jpg  


  17. #17
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    I'm trying to fit BOB Yoke to my Norco (170mm)
    The yoke fits well with a bit of stretching but theres notr much downward travel before it hits the Derailleur body (as was found above). I'm in two minds it needs another 7/8mm 1/4"+ to give more than the travel in the pic below. I can either add spacers, or crush the tubing on the leg. Spacers/washers seem easy but concernes over adding extra length to the skewer (it may need to be equal spacers on both sides?) I'm making an extra wheel (26x4). Hard to envisage just how much travel is needed, can those with a bob generally get them eg. 45 degrees from horizontal? 30 degrees?

    PS. Thanks for sharing the conversation above.


    Bob Trailer w/170mm hub-screen-shot-2016-05-13-8.08.05-pm.jpgName:  Screen Shot 2016-05-13 at 8.06.01 PM.png
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  18. #18
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    Quote Originally Posted by Numbat View Post
    I'm trying to fit BOB Yoke to my Norco (170mm)
    The yoke fits well with a bit of stretching but theres notr much downward travel before it hits the Derailleur body (as was found above). I'm in two minds it needs another 7/8mm 1/4"+ to give more than the travel in the pic below. I can either add spacers, or crush the tubing on the leg. Spacers/washers seem easy but concernes over adding extra length to the skewer (it may need to be equal spacers on both sides?) I'm making an extra wheel (26x4). Hard to envisage just how much travel is needed, can those with a bob generally get them eg. 45 degrees from horizontal? 30 degrees?

    PS. Thanks for sharing the conversation above.


    Click image for larger version. 

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    It doesn't travel much in a downward direction.
    --Peace

  19. #19
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    Quote Originally Posted by Lars_D View Post
    It doesn't travel much in a downward direction.
    I was thinking it would, as close as an extra wheel, hopping logs, mougully ground etc.

  20. #20
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    Numbat, I also found the clearance was not enough with the standard BOB skewer end on the cassette side. I added a spacer, the blue non-turn washer for Shimano internal geared hubs (According to the supplier it was Shimano Part Number: Y34R85010). It has a tab that fits in the dropout slot.Name:  BOB Trailer Spacer above thumb.jpg
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    It gives this clearance for the derailleur.
    Name:  BOB Trailer Spacer Clearance thumb.jpg
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    This is the angle it can get to before it hits the lower parts of the derailleur. It did 4 days of the Munda Biddi Track with no problems.
    Attached Images Attached Images  

  21. #21
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    Want one so bad.......
    "At least I'm enjoying the ride"

    16' Trek 8.4 DS
    16' Farley 7
    and I'm OK admitting..
    16' Sturgis

    Minneapolis MN

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