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Which rear rack works for DRT 4.1 fat tire bike?

Hi

i see Rack’s from Tubus Surly Axiom Blackburn Topeak salsa and others     
some say they’re not for fat bikes with asymmetric rear stays and some specify rear numbers like 190 and 197.  Some say yes for disc brakes some say no.  Not sure that’s an issue here given the stays on this frame.  
please guide me which of these racks will work for this bike.  I’m especially interested in the axiom but would Take any of the above that’ll work. Thanks in advance 

hank

Superusers do not speak on behalf of REI and may have received
one or more gifts or other benefits from the co-op.
18 Replies

Hi @HankG - Thanks for reaching out! We’re going to connect with our product specialists to find out some more info for you on which rear racks are compatible with your DRT 4.1 bike. When we hear back, we’ll be sure to let you know. Thanks!

At REI, we believe time outside is fundamental to a life well lived.
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@HankG Thanks for reaching out!

@ryanjohnson and I had a brief discussion about fitting a rear bike rack to his bike on the conversation (that you started, thank you!) How can I get more information about the Co-op Cycles DRT 4.1 Fat Tire Bike? In it, I share some considerations about braze-ons for a rear cargo rack on the frame of the bike as well as letting him know that Tubus Fat and Blackburn Outpost Fat Rear Rack racks both fit on the back. If I am recalling correctly he had a rack he was planning on putting on his DRT 4.1, Ryan, did that ever work out for you?

Hopefully this helps, thanks!

At REI, we believe time outside is fundamental to a life well lived.
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@REI-JohnJ Hello John thank you for writing and I do remember that early conversation about Ryan’s rear rack. Regarding the tubus and black burn racks, the tubus spec sheet says it will accommodate a tire up to 4.8 inches, and can be 8.1 to 9.2” at the Lower attachment point.  Do you know if the 8.1 to 9.2 fits on our 4.1? And regarding the black burn their spec sheet says it’ll accommodate a tire up to 3 inches wide. I am I  looking at the correct rack? And they describe width adjustability so I’m surprised if it won’t accommodate our tire. Your thoughts? And of the two different ways that the tubus and blackburn attach to the bike at the bottom, is there one of those two attachment methods that you think is superior?
hank

Superusers do not speak on behalf of REI and may have received
one or more gifts or other benefits from the co-op.
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@HankG 

Thanks for the follow up! Both of those racks will work with the Co-op Cycles DRT 4.1. I just measured the rear fork on my 4.1 and it looks like the mounting points are right at the 9" mark. In terms of the Blackburn listing 3" as the 'up to' width, I think that is a mis-print on their part. I looked at a couple of other racks on their site and they have that exact phrasing in the 'features' section so it looks like they just copied it over to the fat tire rack page because it has a similar design but forgot to change the specs. 

Either one of these racks will work great on your DRT 4.1. Do bear in mind that this a HUGE bike tire on the DRT 4.1 so whichever you choose it will be a close fit. The main difference between the two seems to be the adjustability of the Blackburn Rack. It not only can adjust in width (if you ever want to put it on a different bike with a narrower tire) but is also able to attach to the front of a bike as well. The Tubus seems to be a simpler design without as many moving parts or adjustments that can be made. Lastly, the weight limit of the Blackburn is 70 lbs, where the Tubus is 57 lbs. 

Hopefully this helps, come back and let us know how it goes!

At REI, we believe time outside is fundamental to a life well lived.
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John thanks as usual for a very thorough informative response. Do you have any knowledge of the axiom streamliner fat liner? It’s specs say that it’ll handle the tire up to 5 inches so I was hoping that would give me a slight more of a margin, it can hold 110 pounds, and it weighs less. Sounds intriguing. I wonder about the 190 mm spacing and if that works?

hank

Superusers do not speak on behalf of REI and may have received
one or more gifts or other benefits from the co-op.

@HankG 

You're welcome! I had to dig in on the Axiom Streamliner Fat Liner rack to find out some more information. The over locknut dimension (OLD) measurement for the hub spacing on the DRT 4.1 is 197mm. As such, it does not fit the dimensions of the Axiom rack you are looking at. 

Thanks!

At REI, we believe time outside is fundamental to a life well lived.
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Amazing service thanks John.  I’m leaning towards the Tubus.  Its simplicity is calling me and I won’t  need the blaburns ability to change widths Because this rack will be dedicated for the fat bike

Superusers do not speak on behalf of REI and may have received
one or more gifts or other benefits from the co-op.
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John

some racks mention that they are incompatible with asymmetric rear stays. I don’t know what that is, can you tell me if our bike is considered symmetrical or asymmetrical rear stays?

thanks

hank

ps I’m getting out early tomorrow morning on a trail still working on my handlebar width I expect to cut them down tomorrow and if that doesn’t work with the bar end grips and stem raiser that my local REI store put on I think my next step is a Jones bar with a 2 1/2 inch rise which are currently out of stock

Superusers do not speak on behalf of REI and may have received
one or more gifts or other benefits from the co-op.
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@HankG 

Thanks for reaching out with this great question! In case we have other folks reading along who are also curious about bike terminology, I've worked up this photo with labels for parts of the frame:

Screen Shot 2020-11-14 at 9.04.07 AM.png

The term 'stays' refers to the rear 'triangle' of the bike frame, made of the 'chain stay', 'seat stay', and the 'seat tube' (as a side note, both sides of the rear stays are called the same thing; even though the chain is only on one side). Most frames are symmetrical, meaning that on either side of the bike (left or right) the frame is identical. Bikes with asymmetric rear stays have different shapes of stays on the left and right side, which would make it challenging to fit a rack to, particularly if you're working with braze-ons or rack mounts. Because one side of the rear bike frame has the rear gear cog and the other side has the disc brake (if so equipped) there is no rule that says a frame has to be identical on both sides. While somewhat uncommon, typically you'll see asymmetric stays on downhill or full suspension mountain bikes.

All of that is to say: the Co-op Cycles DRT 4.1 bike has symmetric rear stays. Sorry that got a bit longer than I expected! I hope your ride this morning was great and you're getting closer to dialing in your handlebars!

At REI, we believe time outside is fundamental to a life well lived.
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