“If you could reduce rolling resistance in your tyre by 10% when going up a hill, you could take another bottle of water with you, for example,” says Jan. Less energy lost means greater speed or the opportunity to move at the same speed as other riders more easily.
#Roll wheel faster despotism 3k trial#
The faster you go the larger it gets, so if you are doing 50 km/h (30 mph) in a time trial the energy loss is higher than if you were commuting or going up a hill.” “The energy lost in rolling resistance is linear. If you’re a performance-orientated cyclist, rolling resistance is something that you should take a look at because there’s a lot to gain. All other factors – like your chain rubbing, the bearings – might be only 10%. “It will vary depending on the tyre, pressure, tarmac and so on, but at typical road bike speeds aerodynamic drag might account for 70% of the effect holding you back, with about 20% down to rolling resistance. “Aerodynamic drag grows exponentially with speed,” says Jan. > Why riders like you need to get more aero and wheel weight doesn't matter That’s where you are losing energy in what we call rolling resistance.” How important is rolling resistance?įrom about 20 km/h (12.5 mph) upwards, aerodynamic drag is the largest force working against you as you pedal – and Dave looked at it in detail when he visited the wind tunnel – with rolling resistance coming in as runner-up. “Material deforms in contact with the ground, molecules rub against one another creating heat that goes into the environment. “You push the pedals and this results in speed, while aerodynamic drag and rolling resistance are holding you back. “Rolling resistance is energy change,” says Jan.
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Not all of the energy used to deform the tyre is recovered when the pressure is removed. Rolling resistance is one of the forces that opposes you as you ride forward, the main reason for it being that the tyre is constantly deforming as you move (here we’re dealing with rolling resistance as it relates to your tyres we’re not looking at things like bearing friction).
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We’ll start at the very beginning… What is rolling resistance? As the BBC would say, other brands are available. Not surprisingly, that means there are lots of references to Continental products, but it’s not an ad for the German brand. This article was originally going to involve talking with multiple bike industry figures, but Jan gave us a huge amount of information that we didn’t want to waste so we’ve decided to run it as an extended interview.
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#Roll wheel faster despotism 3k how to#
Oh, and if you’ve ever wondered how much difference changing your tyres can really make out on the road, he explained how to quantify it. We spoke to Jan-Niklas Jünger, bicycle tyre product manager at Continental, who gave us valuable and at times unexpected advice for increasing speed, maintaining grip while reducing rolling resistance, and also some interesting fuel for the tubeless versus tubular tyre debate. If you want to cycle faster – or ride at a given speed for less effort – you need to choose your tyres carefully and set them up right to minimise rolling resistance.