@Triad That 125cc GasGas is a bargain if it is 700.00 Euro with those new parts fitted . The only real difference between a 125 and the 250/280/300 bikes is the cylinder, piston ,con rod length . flywheel and stator plus the CDI unit then some minor differences such as exhaust parts depending on manufacture year 2004 especially had different exhaust parts Everything else is common to the larger cc bikes such as frames, wheels, brakes ,gearbox ,clutch etc , the same on all the versions 125 weighs almost as heavy as the larger bikes but feels lighter when riding it . If you are not serious about being a Trials pilot then the 125 has enough power to play and your best gearing will be 9Z gearbox Sprocket and 44Z Rear Wheel Sprocket for trail rides. You also need to mix your Fuel with more oil for play Trail rides such as 40:1 or 50:1 to help against seizures. Trials ratio is 80:1 or 100:1 , The price and the new parts fitted says to you BUY ME! Good luck whatever you choose to do. Regards Alan.