Lapierre Shows the 2014 Pulsium, Takes on Classics with Built in Shock Absorber


While the new Lapierre Aircode is all about cheating the wind, the second Lapierre bike designed for FDJ is all about beating the cobbles. The Pulsium saw its first race at theGrand Prix E3, where the FDJ team put the bike to the test. Developed for the notorious conditions of famous classics like Paris-Roubaix and Tour of Flanders, Lapierre joins a few other companies in offering a bike with borderline rear suspension using an elastomer ring to soak up the bumps. Built with thier Power Box design, the bottom of the bike is all business and super stiff for power transfer, while the upper section of the bike is designed to be as compliant as possible.

More than just a comfy bike, the Pulsuim has a neat little trick to fit massive tires for a road bike…


In the drawing above, the red section of the frame represents the Power Box, a design borrowed from their Xelius EFI. Similar to other bikes on the market, the headtube/downtube/BB/and chainstays are all designed to be oversized and as massively stiff as possible, which allows the upper blue section to be built much more forgiving. The frame also uses an upgraded carbon layup with 40, 30, and 24 ton high modulus carbon fiber. The fork has been tweaked for increased fore-aft flex with increased offset, going from 50-43mm, and the top tube and seat stays are curved to aid in the flex of the frame. 2015-lapierre-pulsium-endurance-road-bike-preview2

Combined with the 27.2 seatpost and the elastomer ring that is hidden in the top tube, the frame claims to soak up as much of the road buzz as possible. We should get a better view of the Pulsium and its elastomer suspension at Sea Otter, so we’ll have a better idea of how the elastomer actually works. Other changes to the frame include longer chainstays than the Xelius EFI for better stability, shock absorption, and tire clearance, as well as a 15mm longer head tube.


Most “comfort” road bikes can fit 28mm tires these days, but how about 32mm? The Modular rear brake caliper can run long reach brakes with the included adapter which will be capable of fitting 700x32c tires. Nothing is mentioned about the fork though. Other features include an aero integrated seatpost clamp for a standard round post, and an internal housing guide to keep the noise down for the internal routing. More from SOC.


24 thoughts on “Lapierre Shows the 2014 Pulsium, Takes on Classics with Built in Shock Absorber

  1. Carbon based object….. so basic building block of the universe. Sigh… when are these guys going to do something new.

  2. I like it. All this moaning about disc brakes? You guys need to move south to where the sun shines and people are happy.

  3. Elastomers worked great for forks in the early 90s….for about 3 weeks, until they crapped the bed.

    Makes TOTAL sense to put them in a frame!

    SOOOOO last century.

    Also, from a physics stand point, where exactly is the pivot point in that mess of a frame that allows it to utilize the (again, terrible idea) elastomer?

  4. Alot of the compliance comes from backwards engineering and using the 27.2 seatpost. Most bike builders went overboard with stiffness for the sake of aero using ISP and bladed seatpost.

  5. Only 12 Lapierre stickers from this veiw,I’m sure there’s at least other 6 we are missing. Thanks for the stickers folks,I thought it was a Synapse for a second.
    Lapierre have been the worst bikes I’ve ever owned.

  6. I think the problem is people are so quick to visualize the shock absorber as a typical unit with a pivot and stroke. That kinda is the case (pivot being the extra top segment above the TT), but you won’t see much visible movement because it’s catering to road buzz as opposed to larger oscillations from cobbles etc. Weight on the saddle (I think) pushes the the seat tube ever so slightly forward. As mentioned, it’s a round 27.2 seatpost so presumably there’s a bit of give shock unit. It’s not quite like the Domane.

  7. @Ventruck, stop trying to be rational by putting thought into things. It’s much more fun to just yell about stickers and assume that since it’s an elastomer it must be based up the same elastomer technology as the 90s.

  8. Yeah Ventruck, stop making sense. Just because the article said it reduces road buzz doesn’t mean it’s not supposed to add 1″ of travel with an advanced wheel path anyway. Plus, where’s the lower pivot?

  9. Ohh…its about road buzz…..

    Im sure someone still has some brass bar plugs that were “designed” to dampen road buzz.

  10. I think you can only get road buzz in Colorado. At least legally. It should sell like hotcakes, er, brownies, in that state.

  11. I’d be more impressed with them doing a titanium (no pivot) softail, but that bike has already been done. This is a big piece of plastic that can’t be recycled. It is designed to fail.

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