- Headset seal problematic
- Compact chainset
- Seatpin bolts susceptible to rust
Price as reviewed:
Ever since man first wobbled down an unmade road on a velocipede, bike and equipment manufacturers have been trying to make the two-wheeled form of transport more comfortable.
Saddles with springs, shaped tubing and of course the pneumatic tyre have all been introduced and, to varying extents, stuck around.
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Modern adaptations are a little more sophisticated, as are the roads we ride on, but the aim is still to improve the comfort of our ride.
Pinarello has gone about solving the problem by adding an elastomer suspension damper to the top of the seatstays that bolts to the back of the seat tube. When it was launched in 2015 it was, unsurprisingly, during Team Sky’s Spring Classics campaign; a cobble-busting aero bike for the Tour of Flanders and Paris-Roubaix.
While most of us will never tackle the Arenberg Forest (at least not on a £9k bike we’d bought ourselves), is there a need for such technology in our day-to-day riding? We’ll come back to that.
Away from the elastomer suspension, this is a standard Pinarello Dogma F8 frame, with all its aerodynamic profiling and top-quality Japanese Torayca carbon.
Design-wise it is largely the brainchild of Dimitris Katsanis, coupled with carbon engineering from Jaguar and Pinarello’s bike-building know-how.
But it’s the suspension that really shines. The elastomer (basically a piece of rubber encased in that pod) gives 10mm of travel.
By flattening and widening the chainstays (called Flexstays here) just behind the bottom bracket, the movement in the damper is soaked up to avoid any damaging stresses being placed on the tube junctions (especially at the bottom bracket).
The Flexstays’ width helps maintain the frame’s rigidity.
Shimano Di2 is to be expected on a bike of this price and, as you probably know, works superbly.
A direct-mount rear brake is used, as the damper takes away the mounting space for caliper brakes.
Elsewhere Pinarello has specced its Most bars, stem and own-brand seatpost, all of which do the job without being overly fussy.
The Mavic Ksyrium Elite wheels are light and stiff with superb braking (even in the wet) thanks to the Exalith textured braking surface.
These came with matching Mavic Yksion Pro 25mm tyres that rolled nicely, gripped well and didn’t wear out too quickly.
The damper, coupled with 25mm tyres, gives a very smooth ride. It’s not like a full-sus mtb where you can feel the bike moving beneath you, but enough to give you the sensation that the road surface is better than it is.
I still felt the bumps and the potholes but the edge was taken off enough to help my lower back feel less battered and bruised than usual following a five-hour ride.
Video – Geraint Thomas Pinarello Dogma K8-S
Comfort, however, isn’t the main gain with the damper. Traction is. Take this bike on a rough or gravelly road and the suspension keeps the rear tyre firmly on the ground. This improves grip by minimising those split seconds when the rear wheel is unweighted. It means you can keep pedalling without any loss of force.
This traction also helps when descending through rough corners. On a normal, stiff carbon frame you might feel the back wheel just skipping out very slightly.
The Pinarello K8-S soaks these vibrations up, improving grip massively. It was genuinely surprising just how much better planted this bike felt when cornering.
Of course, a ‘value’ bike this isn’t; you can get two very good bikes for this price. You do, though, have to remember you are getting the very latest in technology, the best groupset on the market and a fantastic bike.
For the type of terrain you are faced with every day in the UK, something like the Pinarello K8-S does make sense, especially against its thoroughbred counterpart, the F8.
You’re unlikely to find a ride equal to this. The frame is as light and stiff as anyone could ask for, while the elastomer provides cushioning and traction that you won’t get on any other aero road frame. From crits to long days in the saddle, this bike will do it all and as such will suit those who enjoy big-distance challenge events as well as the racers out there. All great, of course, but there’s one more thing that stands out, and makes the K8-S even more praise-worthy. It is one of the most practical bikes I have ever worked on. Aero bikes, like TT machines, are renowned for fiddly bolts tucked away in hard-to-get-at places, making maintenance a nightmare. Not with the Dogma. Every bolt is easily accessible and adjustments are easy. How many top of the range bikes can you say that about? This was a design brief and they’ve nailed it
Miles ridden: 827
Weight: 6.95kg / 15.32lb
Size tested: 53cm
Sizes available: 42 - 62cm
Groupset: Shimano Dura Ace Di2
Alterations: 52/42 chainset, saddle
Gear ratios: 52/42, 11-28
Wheels: Mavic Ksyrium
Tyres: Mavic Yksion Pro
Stem: Most F-Series (alloy)
Saddle: Selle Italia
Distributor: Yellow Ltd