This interesting video explains in an easy and clear way how a four-stroke engine works and its main features.
Trial magazine specialized in trial bikes. Trialworld Magazine is a leader in trial information in all its extension, with trial news and all the latest news from the sector.
If you are interested in trial competitions, you will find a section with the follow-up of all the trial races and the riders.
At Trialworld we do trials of trial bikes and trial reports with a focus on all those contents that help the amateur evolve and learn.