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Mini dirt bikes can be either gas or electric. Gas mini bikes also called pit bikes, are small off road style motorbikes, which are usually more powerful than mini motos.

These bikes often have a manual gearbox and gears and therefore are also slightly harder to ride. These bikes are raced on and off road and are great fun to ride!

Pit bikes start off at 50cc, but you can purcahse larger engined bikes, the majority of them being 125cc with a lot of power. Top speed of a standard pit bike is usually 50+ mph! Therefore these pit bikes are not for the feint hearted.
Some of the most popular dirt bike engine sizes are between 250 - 450cc so therefore will be a lot quicker than mini motos and pit bikes. However they are built for a different kind of racing and therefore need to have this extra power and strength.

If you are young and want to get into dirt biking, dirt bikes do start at 50cc automatic bikes, so everyone can get involved. And then as the rider gets older and more experienced the bikes become larger and more powerful. There are many racing leagues set up for dirt bike riders, starting with the junior classes (50-85cc) working up to the endurance cross country races on 900+cc dirt bikes, so there is a league for everyone to race in.

The new stiff fork has legs of Ø 25mm, made of chromed steel (so no more 24mm). Feet are in aluminium light alloy. The new upper and lower yolk plates are in alloy and are milled from a block. The new fork makes the front side of the 911 GP4 Reverse stronger. It has been improved: stability, when turning, handling and the precision when setting out onto the track. This improved handling means a higher safety level.

The expansion and the end silencer are brand new and with a racing style. The exhaust system goes through the upper side of the frame and it ends under the rear seat. It improves the acceleration and the power output at every rpm. It is part of the new Technical Rules of the photometric tests of the Italian and European Minibikes Championship. The expansion chamber is made of P04 steel at low carbon content. The end silencer is in light alloy. It is serviceable: it let you change the deadening material easily.

December 2003: less than 3 years later its debut, the legendary GP3 reverse Polini minibike opens a new chapter. Similar to the old model in its conception, the new 911 GP4 Reverse Polini minibike is completely different in all the other parts: fork, chain eye, ignition and electronic box, exhaust system, end silencer to end with the details. According to the most advanced technology, the engineers of the factory of Bergamo concentrated themselves on the details that could give the best advantages. These efforts come out not only from improvement of the engine performance, that now has a power of 14hp, but also from the handling and safety driving.