Sempre Pro with a pannier rack?

Discussion in 'Road Cycling' started by zill1, Dec 17, 2013.

  1. zill1

    zill1 New Member

    Dec 17, 2013
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    I recently bought a Bianchi Sempre Pro and am very happy with it.

    However, I am also a commuter and would like to replace my old commuting bike. There are pannier racks out there that can be fitted to a road bike with no rack mounts (e.g. but is the Sempre Pro strong enough to carry a pannier bag on a daily basis that could range between 10kg to 40 kg?

    I have heard positive things mentioned about the construction of the Sempre Pro and how it is stronger than most other carbon bikes such as on this website

    The paragraph below is from this site:

    "Bianchi has incorporated a few proprietary construction methods to the Sempre's carbon design. For one, it's been made stronger by using Bianchi's Carbon NanoTube technology. This process involves adding nano-scaled particles to the resin. By doing so, the particles reduce the microcopic gaps between the resin and the fibers of the carbon. Ultimately, this increases the strength and fracture-resistance by 49% compared to using standard epoxy resin systems."

    But does that make the Sempre Pro able to carry a potentially heavy pannier rack?

    Please note that I usually cycle on a flat bike path for about 2 hours each day.


  2. oldbobcat

    oldbobcat Well-Known Member

    Aug 31, 2003
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    Carbon fiber tubes are very strong against torsion and bending forces. They are very weak against impact and compression. Carbon fiber frames are optimized to resist the forces of the weight of the rider, the torsion and bending of pedaling, cornering, and harsh roads. To a lesser extent they'll take the impact of small flying rocks, the sort kicked up by wheels. Tubes are strongest at junctures--head, seat, bottom bracket, and dropouts. I presume you would be mounting the rack using P-clamps on the seat stays and/or a mono-stay adapter on the carbon seat post, introducing bending and crushing forces where they were not anticipated in the design.

    The blather in the competitive cyclist website about the relative strength of the Sempre Pro is their interpretation of Bianchi's marketing of nanotechnology. Basically, as carbon frames got lighter they used more carbon fiber and less resin, the stuff that bonds it all together. Most carbon frame failure has been the result of resin failure, so bike companies use and tout whatever they're doing to improve the integrity of the resin or use it more effectively. Bianchi's calling card is "nanotechnology," nano-particles that fill micro-gaps in the resin.

    So, beyond using an alloy seat post and attaching a seat post rack to it, I would not mount a rack to a Bianchi Sempre Pro or any other bicycle with a lightweight frame (carbon, aluminum, titanium, or steel) that does not have mounts and is not designed for attaching a rack.