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BOB Trailers, Disc Brakes and Racks a Difficult Combo

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3:20 pm
October 4, 2012


Fire Chief Carlson

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posts 76

Post edited 3:27 pm – October 4, 2012 by Robin Carlson


Via BikeTrailerShop.com Email:

I purchased several Ortlieb bags tonight and will be needing front and rear racks for a Trek 4300 Series bike with a late model B.O.B. Yak trailer. The Trek 4300 has disk brakes and I already experienced a problem with a Topeak rear rack preventing the Yak to engage with its skewer. The Topeak rack has since been removed.

When trying to use both the Bob Trailer and a rack with disc brakes there are a few options.

First option: You will need to get yourself a Old Man Mountain Pioneer Rear Rack in the Disc Brake size, along with a pair of Bob Nuts 10x1".  You will need to enlarge the middle  hole on the J shaped OMM bracket to accept the 10x1" bolt that will be used to mount the Bob Nutz to the Mounting hardware.  See below images.  The next item you will need is the Bob Santana Fork, this will give you the width necessary to attach the Bob trailer to the Bob Nutz.  The Santana fork can only be used with 26" and 700c wheels, anything larger and the tire will scrub the inside of the Santana fork.  Fenders for the two acceptable wheel sizes should be fine.  The fork will need to be stretched a bit to fit over the Bob Nutz, but with a little muscle you will be able to get it to fit.

Second Option:  You will need to acquire a Tubus Disco, this rack is quite hard to get inside the US right now, but should be available in Europe.  The standard length Bob quick release should be long enough to go through the Disco brackets.  However a combination of washers and longer bob quick release might be necessary to avoid any collision between the rack and the trailer fork.  I cannot test this being we no longer have any of the Disco racks in stock.

3:46 pm
October 4, 2012


Josh Lipton

Admin

posts 344

Post edited 4:20 pm – October 5, 2012 by Josh Lipton


A few notes to add to Robins post regarding the use of Old Man Mountain Racks.  The solution can also can be accomplished with the Old Man Mountain Sherpa.

When doing this setup with the disc version of these OMM racks, we really had to spread out the Santana BOB Fork.  The best approach would be to spread the rack out a little bit with a vise, effectively cold setting it into a slightly wider position.  An aspect of this setup is that the Santana Fork will be offset slightly to the left.  This has the impact of reducing clearance for wider tires and also causes the BOB Trailer to be sitting slightly to the left as well.

When setting up a BOB Trailer to work in combination with OMM racks on nonDisc bikes , the 700/29" version of the racks can be utilized and the BOB Santana Fork will not need to be spread out in order to fit.  With this setup, the wheel will also be centered to the BOB Fork as shown in the forth photo above.

One other thing to mention is that these configurations have not been tested by OMM or BOB or ourselves for that matter.  These types of setups will likely void the warranty with both BOB and OMM.  If you are worried about damaging your gear or getting hurt, just don't bother with this complex setup.  There are plenty of other ways to carry gear on a bike.

Josh
BikeShopHub.com
1-800-717-2596

9:10 am
October 20, 2012


Gene Rodrigues

New Member

posts 1

> Second Option:  You will need to acquire a Tubus Disco, this rack is quite hard to get inside the US right now,
> but should be available in Europe.  The standard length Bob quick release should be long enough to go
> through the Disco brackets.  However a combination of washers and longer bob quick release might be
> necessary to avoid any collision between the rack and the trailer fork.  I cannot test this being we no longer
> have any of the Disco racks in stock.

I took a look at the Tubus Disco on OrtliebUSA.com and it appears to be closer to what I want. I will search around to see if I can find one in stock somewhere in my area or will order one from elsewhere.

For me, a better solution than force or heat bending the Santana fork is to fabricate a new fork from scratch based on a custom skewer of the proper length (longer than the Santana skewer). It would be a lot easier if someone built a solution but I would guess there is little demand for it.

I am not worried about losing warranties on any of the items purchased for this project, including the Trek 4300 Disc and its components. Disc brakes were required for this bike and many of my problems so far have involved finding work-around solutions for problems that never should have existed in the first place (e.g., removing mounting lugs from the bike forks designed for disc brakes, making it difficult to mount front panniers). No one builds exactly what I need, so I have had to make modifications or design and build new components as necessary.

I can post instructions for solving the problem on my site a bit later after I finish making the new assemblies.

4:51 pm
December 29, 2013


OlTrailDog

Guest

I was doing some serious cogitating on how I was going to hook up my Yakima Big Tow trailer to the rear of my Actionbent recumbent trike.  I'm revamping my plans to do the TA with my bike by using the trike instead. The trike is set up with an OMM Cold Springs rear rack and Arkel Dolphin panniers. 

 

I had decided on investigating two alternatives (1) drilling out some BOB nutz, making an extra long QR with a tap and die, and spreading the fork or (2) cutting of the aluminum boss on the OMM rack mount and replacing it with a BOB nutz and fabricted long QR.  But lo, a google search lead me right here to your glorious site with the solution, i.e. BOB nutz and a bolt in the OMM rack mount slot.   I will experiment with the Yakima BT fork knowing that I can replace it with the BOB santana fork if necessary.  What a great site.  My first visit was while searching for information about the Xtrawheel trailer that I am also considering.  Next, I happen across some information on your site about using the BOB QR or nutz for mounting the Yakima BT.  For now I will be content with making my first purchase of a pair o' BOB nutz.  Thank you, thank you, thank you!

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