We still don’t really know how bicycles work

Forget mysterious dark matter and the inexplicable accelerating expansion of the universe; the bicycle represents a far more embarrassing hole in the accomplishments of physics.

Let’s be honest, a bit of the pleasure at Chris Froome’s victory in the Tour de France is down to this being our second victory in a row and to the thought that the French haven’t won it since 1985. What must be worse for them, though, is that when it comes to the science of team cycling, even the Belgians are in front.
 
At the University of Mons, researchers are developing something called the Anaconda. It’s never going to be much of a speed machine because it is, in effect, a chain of monocycles with handlebars. These units are connected, by means of hinges that allow them to snake along, to a normal two-wheeled bike at the front. Every rider in the chain can be going in a slightly different direction, which means it takes an enormous amount of control and collaboration to move the thing forward. According to Olivier Verlinden, chief engineer on the project, the main qualification for riders is to be unafraid of falling off.
 
It’s fun, apparently. The idea is to unleash it as a beach-resort bike, the kind of thing that stag and hen parties will use to terrorise seaside towns across the world. But it is also scientifically interesting. Why? Because we still don’t really know how bicycles work.
 
It is rare that most people appreciate the bicycle, but it is quite an extraordinary machine. Push a riderless bike, letting it roll freely at high enough speeds, and it can withstand pushes from the side – it will wobble a little, but quickly recover. In the conventional analysis, that is because the gyroscopic force of the front wheel, its mass and the spontaneous turn of the handlebars all act together to keep the bicycle rolling forwards. This has something to do with the gyroscopic effect, the force that keeps a spinning top upright. You can feel this by removing a wheel from your pushbike and spinning it while you hold the axle spindles. If you try to change the orientation of the wheel, you’ll feel it push back against you.
 
The first mathematical analysis of bicycles suggested that this is also what keeps a moving bike on its wheels. But although the equations were written down in 1910, physicists always had nagging doubts about whether this was the whole story.
 
The most definitive analysis came exactly a century later. It involved an experimental bicycle that had all its gyroscopic effects cancelled out by a system of counter-rotating wheels. The effort of building such a strange contraption was worth it: the resulting paper was published the prestigious journal Science.
 
The publication plunged bicycle dynamics back into chaos. It turns out that taking into account the angles of the headset and the forks, the distribution of weight and the handlebar turn, the gyroscopic effects are not enough to keep a bike upright after all. What does? We simply don’t know. Forget mysterious dark matter and the inexplicable accelerating expansion of the universe; the bicycle represents a far more embarrassing hole in the accomplishments of physics.
 
And it may not be solved any time soon; very few researchers are working full-time on bicycle dynamics and there’s very little money in it. Once we’ve discovered exactly how these contraptions work, it might be possible to come up with bold new designs of bicycle – perhaps even better than the Anaconda. But nobody is desperate for that to happen; not even the French.
 
Maybe that’s OK. In an age where we have worked out the history of the cosmos and the secret of life, it’s rather nice that the humble bicycle keeps our feet on the ground. 
 
Cyclists during the Tour de France. Photo: Getty

Michael Brooks holds a PhD in quantum physics. He writes a weekly science column for the New Statesman, and his most recent book is At the Edge of Uncertainty: 11 Discoveries Taking Science by Surprise.

This article first appeared in the 29 July 2013 issue of the New Statesman, Summer Double Issue

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The 11 things we know after the Brexit plan debate

Labour may just have fallen into a trap. 

On Wednesday, both Labour and Tory MPs filed out of the Commons together to back a motion calling on the Prime Minister to commit to publish the government’s Brexit plan before Article 50 is triggered in March 2017. 

The motion was proposed by Labour, but the government agreed to back it after inserting its own amendment calling on MPs to “respect the wishes of the United Kingdom” and adhere to the original timetable. 

With questions on everything from the customs union to the Northern Irish border, it is clear that the Brexit minister David Davis will have a busy Christmas. Meanwhile, his declared intention to stay schtum about the meat of Brexit negotiations for now means the nation has been hanging off every titbit of news, including a snapped memo reading “have cake and eat it”. 

So, with confusion abounding, here is what we know from the Brexit plan debate: 

1. The government will set out a Brexit plan before triggering Article 50

The Brexit minister David Davis said that Parliament will get to hear the government’s “strategic plans” ahead of triggering Article 50, but that this will not include anything that will “jeopardise our negotiating position”. 

While this is something of a victory for the Remain MPs and the Opposition, the devil is in the detail. For example, this could still mean anything from a white paper to a brief description released days before the March deadline.

2. Parliament will get a say on converting EU law into UK law

Davis repeated that the Great Repeal Bill, which scraps the European Communities Act 1972, will be presented to the Commons during the two-year period following Article 50.

He said: “After that there will be a series of consequential legislative measures, some primary, some secondary, and on every measure the House will have a vote and say.”

In other words, MPs will get to debate how existing EU law is converted to UK law. But, crucially, that isn’t the same as getting to debate the trade negotiations. And the crucial trade-off between access to the single market versus freedom of movement is likely to be decided there. 

3. Parliament is almost sure to get a final vote on the Brexit deal

The European Parliament is expected to vote on the final Brexit deal, which means the government accepts it also needs parliamentary approval. Davis said: “It is inconceivable to me that if the European Parliament has a vote, this House does not.”

Davis also pledged to keep MPs as well-informed as MEPs will be.

However, as shadow Brexit secretary Keir Starmer pointed out to The New Statesman, this could still leave MPs facing the choice of passing a Brexit deal they disagree with or plunging into a post-EU abyss. 

4. The government still plans to trigger Article 50 in March

With German and French elections planned for 2017, Labour MP Geraint Davies asked if there was any point triggering Article 50 before the autumn. 

But Davis said there were 15 elections scheduled during the negotiation process, so such kind of delay was “simply not possible”. 

5. Themed debates are a clue to Brexit priorities

One way to get a measure of the government’s priorities is the themed debates it is holding on various areas covered by EU law, including two already held on workers’ rights and transport.  

Davis mentioned themed debates as a key way his department would be held to account. 

It's not exactly disclosure, but it is one step better than relying on a camera man papping advisers as they walk into No.10 with their notes on show. 

6. The immigration policy is likely to focus on unskilled migrants

At the Tory party conference, Theresa May hinted at a draconian immigration policy that had little time for “citizens of the world”, while Davis said the “clear message” from the Brexit vote was “control immigration”.

He struck a softer tone in the debate, saying: “Free movement of people cannot continue as it is now, but this will not mean pulling up the drawbridge.”

The government would try to win “the global battle for talent”, he added. If the government intends to stick to its migration target and, as this suggests, will keep the criteria for skilled immigrants flexible, the main target for a clampdown is clearly unskilled labour.  

7. The government is still trying to stay in the customs union

Pressed about the customs union by Anna Soubry, the outspoken Tory backbencher, Davis said the government is looking at “several options”. This includes Norway, which is in the single market but not the customs union, and Switzerland, which is in neither but has a customs agreement. 

(For what it's worth, the EU describes this as "a series of bilateral agreements where Switzerland has agreed to take on certain aspects of EU legislation in exchange for accessing the EU's single market". It also notes that Swiss exports to the EU are focused on a few sectors, like chemicals, machinery and, yes, watches.)

8. The government wants the status quo on security

Davis said that on security and law enforcement “our aim is to preserve the current relationship as best we can”. 

He said there is a “clear mutual interest in continued co-operation” and signalled a willingness for the UK to pitch in to ensure Europe is secure across borders. 

One of the big tests for this commitment will be if the government opts into Europol legislation which comes into force next year.

9. The Chancellor is wooing industries

Robin Walker, the under-secretary for Brexit, said Philip Hammond and Brexit ministers were meeting organisations in the City, and had also met representatives from the aerospace, energy, farming, chemicals, car manufacturing and tourism industries. 

However, Labour has already attacked the government for playing favourites with its secretive Nissan deal. Brexit ministers have a fine line to walk between diplomacy and what looks like a bribe. 

10. Devolved administrations are causing trouble

A meeting with leaders of Scotland, Wales and Northern Ireland ended badly, with the First Minister of Scotland Nicola Sturgeon publicly declaring it “deeply frustrating”. The Scottish government has since ramped up its attempts to block Brexit in the courts. 

Walker took a more conciliatory tone, saying that the PM was “committed to full engagement with the devolved administrations” and said he undertook the task of “listening to the concerns” of their representatives. 

11. Remain MPs may have just voted for a trap

Those MPs backing Remain were divided on whether to back the debate with the government’s amendment, with the Green co-leader Caroline Lucas calling it “the Tories’ trap”.

She argued that it meant signing up to invoking Article 50 by March, and imposing a “tight timetable” and “arbitrary deadline”, all for a vaguely-worded Brexit plan. In the end, Lucas was one of the Remainers who voted against the motion, along with the SNP. 

George agrees – you can read his analysis of the Brexit trap here

Julia Rampen is the editor of The Staggers, The New Statesman's online rolling politics blog. She was previously deputy editor at Mirror Money Online and has worked as a financial journalist for several trade magazines.