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I am hoping to buy one of these in the next few weeks:

Specialized Roubaix SL4 Expert Disc Di2 2014 Road Bike

But I will be using it for commuting and need some luggage so I need to fit a pannier rack (I'm going to ignore all the shouts of horror about using this bike for commuting or putting a rack on it).

Initially I thought that this was not possible and I was looking at getting a custom Titanium frame made with the same components. I have now found a couple of options though.

There is the Tubus set of pannier racks. I have used a Tubus rack before on a bike with no eyelets and it seemed to work very well. If I use the Tubus Clamp Set For Seat Stay Mounting and the Tubus Adapter Set For QR-Axle Mounting I think that'll work won't it? I am unsure if the rack will clear the disc brakes though...

There is also the Axiom set of racks as shown in the video. They specifically make a rack for road bikes with disc brakes which sounds very promising. I can't see how the rack will attach to the frame at the top with no eyelets and no caliper brakes. I could use the Tubus Clamp set though (which I have on my current bike)

So, Will mounting this to my bike damage the carbon frame? Any recommendations about which rack / mounting system I should go for?

Thanks

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I think you have to be careful when mounting extra onto carbon frames - they're often designed with very specific loads in mind, and might not be very strong in other directions. On the other hand, it might work fine. –  7thGalaxy Feb 26 at 10:13
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Carbon is especially problematic with clamping forces, so be careful if you need any clamps on frame tubes. –  arne Feb 26 at 11:08
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A Carbon Fiber Roubaix Di2 for commuting is insane, unless by commuting you mean participating in the Paris-Roubaix. Generally, race bikes don't take well to racks, either due to geometry or just not having the proper mounts and strength in the right places (especially with carbon). –  Batman Feb 26 at 13:24

2 Answers 2

I would recommend getting a second bike for commuting. The Specialized Roubaix is a racing machine. It would also be foolish to leave it locked outside a shop (in case you considered doing that).

Most likely you will void the warranty by using clamps on seat stays. To get that low weight, carbon frames are strong only in certain directions and may be relatively weak in others.

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Why not use a Roubaix for commuting? Seriously I am wondering why people are so against this. I never leave the bike locked up outside, it is locked up in the underground car park in my building. Over the year I commute around 6,000 miles. I probably do less than 500 weekend miles so there is no point having a nice bike for the weekend. If I have a nice bike I want to use it and enjoy it. The main impetus for change was getting disc brakes, I am fed up with mini cabs pulling out in front in the wet and my brakes not working! –  Roaders Feb 26 at 16:20
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I would just like to point out that you could have a "nice bike" that also has a steel/aluminum/titanium frame. Those two criteria are not mutually exclusive. Buy a nice frame that's designed to accomodate racks, and go crazy on the rest of the components if you want. Surly makes a few quality frames that support racks, disc brakes, and basic road bike geometry. There are plenty of other manufacturers as well. –  Kibbee Feb 26 at 16:39
    
Another option that I am considering is a custom made Titanium frame with the same component set on. I want the hydraulic brakes and the electronic gears. This is pretty much the only bike off the shelf that has them. If I can't get a good pannier rack solution for the Carbon bike then I will go with the Titanium. At the moment I am weighing up the options. –  Roaders Feb 26 at 16:57
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The geometry isn't suited for using panniers or a rack period. Commuting destroys bikes with road salt, water, snow, stuff kicked up from cars, etc. along with the occasional get hit by a car (which a carbon fiber Roubaix will likely not survive), so you don't want to run expensive components unless you're Bill Gates. The theft issue is also a (very) big one which people don't really realize until they've had a bike or two stolen. And I can almost guarantee in London, a Roubaix (especially a high end one) will get stolen pretty quickly. –  Batman Feb 26 at 21:24
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This is the most important part of this answer: "Carbon frames are strong only in certain directions and may be relatively weak in others." Theft is a secondary concern, albeit a real one. The lateral forces generated by a rack with panniers will likely fatigue the carbon leading to catastrophic failure. Don't put racks on this bike. It'd be easier and less disappointing to just pull money out of your wallet and tear it in half. –  jimirings Feb 27 at 1:53

Ignore the nay sayers - I've been commuting on a carbon frame for 3000 miles - 20 miles per day plus 50 at weekends.

It's been absolutely fantastic. Just don't bunny hop curbs and it'll stay good.

Even if I wrecked it I'd still replace it with another carbon frame. If it makes such a difference on a track, why not get that benefit during the times by far and away you use it the most?

I just wish I could attach panniers easily to it too!

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Does not answer the question. –  mattnz Jun 23 at 0:09

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