Seat height and angle
1. Adjust seat height. With a wrench or socket and ratchet, loosen seat post nut. Hold rear wheel between your legs and lift out seat, twisting as you pull.
2. After wiping post clean, mark a safety line 2-1/2 in. from its bottom. After adjustment, line must not show above seat tube. If it does, get a longer post.
3. Reinsert post into seat tube. With pedal crank arm parallel to tube, set seat so your heel rests on pedal when your leg is extended. Check safety line.
4. Loosen seat clamp nut under saddle and tilt seat so that either it is parallel to the ground or its front end is slightly higher than its back end.
Handlebar height
1. After adjusting seat, loosen expander bolt on stem; turn counterclockwise until head is 1/4 in. (but no further) above stem. 2. Place wooden block on bolt head and tap on wood until the bolt is driven down flush with stem. This loosens expander inside stem.
3. Holding front wheel between your knees, lift the handlebar free. Wipe stem. Inspect expander; if damaged, buy a replacement. 4. Mark a safety line 2-1/2 in. from stem bottom (see Step 2, above). Set bar height so that expander bolt is level with front of seat.
Handlebar angle
To adjust handlebar angle, (1) loosen binder bolt on handlebar stem; (2) If your bicycle has an upright bar, set it so that your wrists are straight when you grasp the grips while sitting in an upright position; (3) If your bicycle has a dropped bar, adjust it so that the top of the bar is parallel to the ground or tilted down slightly. Finish by tightening the binder bolt.