We investigate suspension in road frames and ask is it worth the investment?

With the cobbled Classics underway, road suspension is a hot topic. Pinarello already has production bikes with rear suspension in its range and one of the pioneers of carbon frame design, Craig Calfee, has been quoted as saying that suspension will revolutionise road bikes. Could this be the start of a new era for road cycling?

The benefits

Mention suspension and most riders will cite comfort as the main benefit. “Suspension helps with the pain of a long ride. Reducing the pain allows the mind to focus on pedalling and keeping cadence high and constant, enabling the body to recover quicker,” explains Mark Swift of British brand USE, whose Vybe suspension seatposts have become increasingly popular in recent years.

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A suspended frame or fork also helps the wheel to maintain contact with the ground over rough roads. As the contact remains more consistent, grip levels through cornering and accelerations are higher. This should lead to fewer crashes.

It is also easy to see how this ground tracking could aid climbing as the suspension helps the rear wheel ‘dig in’. Also, as the rider is not moving so much on bumpy roads, more energy can be put into forward momentum, leading to higher average speeds.

Active and passive

fabian cancellara trek domain bike trade branch

Fabian Cancellara’s Trek Domane with IsoSpeed from Strade Bianche. Photo: Graham Watson

Most designs can be split between active and passive styles. An active design normally utilises some form of shock absorber within the frame to yield more controllable movement.

Typically with road frames these units tend to be situated at the top of the seatstays, close to the rider. Designs can then use pivots to allow the frame to move or, more likely, chain and seatstays that can flex. Suspension travel tends to be limited to 10-20mm. The Pinarello Dogma K8-S and Calfee Manta are good examples of this.

A passive system has no traditional moving parts or dampers. These designs work mainly through the inherent qualities of materials used in frame construction. Differing grades and amounts of carbon are incorporated within thinner or flatter shaped tubes to add shock absorption. Most carbon manufacturers employ this system.

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Other manufacturers fit shock-absorbing rubber or elastomer inserts to frames to eliminate ‘road buzz’, working much like wrapping a tuning fork in a rubber band.

Specialized has the Zertz, Lapierre has SAT. Trek has been using the IsoSpeed Decoupler pivot to allow the seat tube of its Domane and Madone frames to flex back and forth considerably; as Jez Loftus from Trek UK pointed out, this style of suspension allows the rider to stay in the saddle for longer.

Bauke Mollema’s pro bikes

Despite the apparent numerous advantages of a suspended design, most major manufacturers admit that active, rear suspended systems are low on their list of priorities.

With the increased costs of suspension frames and even the best systems having slight power transfer disadvantages, most of the big players are focused on carbon manipulation.

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Trek is working with NATO-spec carbons ‘unavailable to the Taiwanese market’ in its higher-end, US-built frames. Bianchi is focused firmly on Countervail carbon development to tune the ride of its bikes.

Despite these issues, the technologies are still growing and hopefully we might see other big names at the cobbled Classics sporting new designs.

Our take

Pinarello K8-S crop

Pinarello is a pioneer of active road bike suspension

It may just be a reoccuring fad but in many ways suspension makes sense. Britain’s notoriously poor road surfaces and the rise of gravel road riding means riders are increasingly looking towards designs centred on comfort.

As with many new technologies, such as disc brakes, it is often acceptance by pro racers that limits the widespread uptake.

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With most of the big names pushing carbon manipulation rather than suspended designs, it will be probably be some time before we see ‘proper’ production suspension in the mainstream.

But, like disc brakes, technology keeps rolling forward, and with companies such as Pinarello pushing to reduce the power transfer losses and costs, it might not be too long before more brands join in the fight.

King Kelly talks cobbles

Is road bike suspension the future?

Craig Calfee, designer and frame builder at Calfee Design

Suspension is faster and safer. It offers better traction for acceleration and cornering, reduces fatigue from vibration and the suspension itself reduces movement of the rider’s mass vertically (over bumps) so more energy can be focused on moving forward. It’s safer and race leaders will crash on high-speed descents less often.

Gruffudd Lewis, pro rider, Madison-Genesis

Personally I love the aesthetics of a traditional-looking frame. I think adding suspension can possibly take it a step too far. It would be a shame one day to see a road bike that looked nothing like the bikes of the past. There are advantages for the cobbled Classics, absorbing much of the ‘bone shaking’. But that’s why these races have such a reputation, why take it away?

  • Gronck

    Not so. I switched to a Trek Domane from a Madone(pre de-coupler)exactly as it is more comfortable and enables me to ride longer.

  • tldr; yes, suspension on typical road bikes is just a cash cow for the manufacturers

  • Charles Lindsey

    Passive and active road bike suspension will become additional road bike options offered by the manufacturers. A little over six years ago, you mainly had two choices in the bike shop, time trial or road bike. (And before Greg LeMond’s victory in the ’89 Tour with his prototype time trial bike, cyclists really had one choice, road bike). Today, you have lightweight road, endurance/comfort road, aero and time trial bikes. The product lines are steadily being extended. Today bike shops look more like car lots. You may not like suspension, so you simply move down the aisle to the aero model, say.

  • Dave2020

    The short answer to the headline is ‘yes’ because the conventional designs used are only a slightly different compromise to the easier alternative of reducing tyre pressure by a couple of ‘bar’.

    The orthodox delusions described by Craig Calfee are just the usual marketing spiel and peculiar to the mountain bike in any case. If there were any truth in his claims, he would make a full sus’ road bike and prove that it works. i.e. Get everybody riding it, the same way that everybody races on a full sus’ mtb!!!!!!

    Today’s full sus’ bikes are as compromised by design convention as they were back in 1994 when Bianchi tried out a bike that was – “very comfortable but a real pig when it came to climbing. Thankfully it was only used at Roubaix, not the Tour of Flanders”.

    We’ll only see a return to a suspension road fork if it’s made to the ’80’s design principle illustrated top left. Design engineers didn’t understand it a quarter of a century ago and they still don’t get it. Reactive Suspension improves the frame’s response, never needs a lockout and does it all without any damping.

  • J1

    The K8-S is a mere £7799 tbf, I’ll take two!…..or ya know Rule 5.

  • PavoFahrer

    I’m with Gruffudd, although Treks Decoupler (as used on Svens ‘crosser) and Specialized Zertz inserts keep aesthetics and bring a little comfort 🙂

  • Jay

    Whether manufacturers use carbon layering, fork and seat stay shaping and geometry or mini suspension actuators like the Pinarello, you still loses power to the back wheel simply due to flex and force dissipation through these systems.

    Having suspension should improve a bike’s handling as it is more stable. Actuators are probably better as you could lock them out like MTBs, but what’s the point when this is a perfect excuse for another ‘n+1’ bike!

  • Andy

    Can’t say I’m that uncomfortable on a modern road bike to think ‘ I wonder what a suspension bike will feel like ‘ . Disc brakes and suspension don’t appeal to me. Leave that to the MTB riders.

  • MrHaematocrit

    Is there any real data or evidence at this time to suggest or support suspension bikes as being safer on general roads? I’m not aware of any which supports this without massive cost to road performance & efficiency
    I wonder if Craig Calfree considers full suspension MTB’s to be safer than road bikes due to his statements/marketing blurb
    If the claims being made by Craig are true why are these suspension bikes not ridden in the grand tours where fatigue plays a major role in performances.

  • llos25

    An expensive gimmick by the manufacturers.

  • Bob

    Technology moves on. Today’s bikes look nothing like the ones in the (quite near) past anyway, and anything to make them safer and more comfortable can’t be a bad thing IMHO