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PROBLEM POSSIBLE CAUSES SOLUTION
Chain won’t reach...
• The smallest rear sprocket
• The largest rear sprocket
• The smallest front chainring
• The largest front chainring
• Rear derailleur high (H) limit is too tight
• Rear derailleur low (L) limit is too tight
• Front derailleur high (H) limit is too tight
• Front derailleur low (L) limit is too tight
• Turn high (H) limit bolt counter clockwise
• Turn high (L) limit bolt counter clockwise
• Turn high (H) limit bolt counter clockwise
• Turn high (L) limit bolt counter clockwise
Chain skips • Chain is worn out
• One or many sprockets worn out
• One or many chainrings worn out
• Sprocket or chainring has a broken tooth
• Replace chain
• Replace sprockets
• Replace chainrings
• Replace sprocket or chainring
Weak braking • Brakes are not properly adjusted
• Brake pads are worn out
• Rim or disc is dirty
Hydraulic disc brakes
• Brake fluid is missing
• Air bubble in the hydraulic line
• Adjust brakes
• Replace brake pads
• Clean rim or disc
• Add brake fluid
• Bleed the hydraulic line
Vibrations while braking • Loose headset bearings
• Brake are not properly adjusted
• Brake pivots are loose
• Rim or disc rotor wobbling
• Front wheel not properly attached
• Adjust headset bearings
• Adjust brakes / Add an angle (toe-i n)
• Tighten brake pivots
• Align or replace rim or disc rotor
• Align and tighten front wheel into fork
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