2. Parts of a bike
 The wheels
 The frame
 The cranks, sprocket and chain
 The seat
 The stem
 The handlebar and grips
 And the change of speed control is there
is one

3. Types of cycling:
 Route cycling
 Track cycling
 Mountain cycling
 Trial cycling
 Freestyle cycling

4. -Route cycling:
http://www.youtube.com/watch?v=rkv8krkrRNM
-Track cycling:
http://www.youtube.com/watch?v=9UafA2541c
4
-Mountain cycling:
http://www.youtube.com/watch?v=MwgiN4J2dXA
&feature=related
-Trial:
http://www.youtube.com/watch?v=Cj6ho1-
G6tw&feature=related
-Freestyle.:
http://www.youtube.com/watch?v=DoHMzC97F
SE