Andrew Trevitt

At the recent MotoGP event in Austin, Tex., Repsol Honda rider Marc Marquez became the youngest-ever rider to win a premier-class Grand Prix race, displacing Freddie Spencer from the record he had held for more than 30 years. It was the young Spaniard's second MotoGP race, and after two rounds…

Almost lost in BMW's celebration of Chaz Davies winning both World Superbike races at Motorland Aragon in Spain was Sylvain Barrier's victory aboard a BMW in the FIM Superstock 1000 Cup race at the same event. Barrier's win itself was not unexpected - the Frenchman is the reigning champion in…
In the current issue of Inside Motorcycles, my article covers some of the electric racing motorcycles and how improving battery technology is leading to some very different design paths from what we consider conventional. One electric bike I find particularly interesting from a chassis design point of view is the…
If you watch MotoGP racing you have no doubt noticed almost all the riders hanging their inside legs off the footpeg and to the side of the motorcycle at the entry of many turns. It has become quite common over the last few years and has more recently spread to…

Using countersteering to turn your motorcycle is a well-understood and easily grasped technique: Turn the bars to the right, and the motorcycle will fall to the left; turn the bars to the left, and the motorcycle will fall to the right. We learn this instinctively from the first time we…
For both street and track riders, the ability to turn quickly is an important skill. On the race track, that skill will allow you to go through chicanes at a higher speed. On the street, turning quickly can mean the difference between avoiding an obstacle or not.
My last two blogs have focused on the braking and throttle control aspects of riding smoothly; this week, I will look at how the same concepts can be applied to cornering and lean angle to maximize corner speed.

In my last blog I talked about the importance of being smooth when opening the throttle on corner exits. Another aspect of riding smoothly is how you apply - and, just as importantly, release - the brakes entering the turn. Many riders use the brakes more as a simple on/off…
Over the past year, many MotoGP riders and watchers have noted how smooth Jorge Lorenzo rides, and that it is one key to his success in 2012. There is no question you have to be smooth to ride a 260-horsepower MotoGP bike, but the same can be said of any…
Your body position on the motorcycle plays a large part in its handling; where you have your weight in a corner, or how you shift your body in a chicane to help steer the bike, for example, can make a huge difference. But, like most aspects of riding a motorcycle,…

At the EICMA show in Milan, Italy last month, Marzocchi introduced its semi-active suspension system. The company plans to offer the system in the near future as an OEM fitment as well as aftermarket versions of the electronic forks and shocks. The Marzocchi semi-active suspension shares characteristics with both Ducati…
In the current issue of the magazine, my article covers in detail the semi-active suspension systems recently introduced by Ducati and BMW, along with a brief primer on active suspension. While semi-active or adaptive systems have become more prevalent in the motorcycle industry in recent years there has been little…
At the final Grand Prix event of the year, Yamaha traditionally holds a press briefing and discloses some information about that year's YZR-M1 machine and its development. This year was no different, and at the recent Valencia round Kouichi Tsuji, MotoGP Group Leader and YZR-M1 Project Leader, gave this year's…

Quite often when the subject of gearing comes up, many riders and tuners talk about anti-squat at the same time. Gearing and anti-squat are related, and when you change gearing you may also have to make a chassis change to keep anti-squat characteristics the same. When your bike is accelerating,…
As with any setup decisions made at the track, it's nice to have some data to look at to confirm what the rider is saying or even make a change with no input required. A rider may say that he needs taller final gearing after a session, but with some…
In the latest issue of Inside Motorcycles, my article discusses some of the advantages of changing your motorcycle's final-drive gearing. This can make a significant difference, especially on late-model sportbikes that are equipped with tall gearing and very close-ratio gearboxes. For track-day riders and racers, there are some additional subtleties…

Another data channel that shows a significant amount of information about the rider's habits - and is easily generated in almost any data acquisition system - is braking G. This channel shows actual deceleration in units of g, as opposed to brake pressure, which shows what's happening at the lever…
One of the more useful channels to look at when using data to improve your riding is lean angle. This channel can show some interesting detail about what’s happening on the track, and it’s easy to visualize what is actually going on from looking at the data in graphical format.…
Over the last few weeks, several people have asked about the tire's contact patch, and how it plays a role in trail - especially given that the tire is constantly deforming and the contact patch is very much a dynamic feature itself. As most riders know, tires play a huge…

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