Have you ever wanted to do tricks on a cool bike? You will learn where the sport came from, and how to ride a BMX bike. Learn about some very thrilling and challenging sports including wind surfing, BMX biking, inline skating, river rafting, rock climbing and if you dareā¦ skydiving! BMX Bikes is one of 6 books in a set called X Sports, which is part of the Sound Out Phonics Based Chapter Books series. X Sports (Sound Out Levels 5 and 6) focus on the following skills: contractions, one-syllable spelling patterns, tense endings, word endings, compound words, prefixes and suffixes, and simple two-syllable words. Readers will not be able to tell that each book is written using controlled vocabulary.