Bontrager 283415 Manual De Propietario

3

Correct maintenance of the crankset and other parts of the drivetrain 

will make the shift system work better and pedalling smoother, and 
increase the life of the parts. Maintenance includes Inspection, Lubrica-
tion, and Adjustment.

 check that the chain is clean, free 

of rust, and properly oiled. A dirty chain can pre-
maturely wear the chainrings. All links of the chain 
should pivot smoothly and without squeaking, and 
no links of the chain should be deformed.

, a more thorough inspection 

is recommended. Check your chain for wear with 
a chain wear gauge or a ruler. Each full link of a 
new chain measures one inch. If 12 links of your 
chain measures 12

1/8

 inches or more, it should be 

replaced. With good maintenance, a chain usually 
lasts 1000 to 1500 miles. A worn chain will cause 
the chainrings of your crankset to wear prema-
turely. Replacing the chain takes special tools and 
training and should only be done by your dealer.

Tighten the pedals into the crank arms; turn the right pedal clock-

wise, but the left pedal counter-clockwise (Figure 2): 

• Pedals: 350-380 lb•in (40.2-42.9 N•m). 

Clean the chainrings and inspect them for damage. If any teeth are 

bent or broken, have the chainring replaced by your dealer. Note that 
a few teeth have a special shape to enhance shifting. Also check the 
bottom bracket adjustment, and tighten the crank bolts:

• Crank bolt (Figure 2): 360-415 lb•in (41-47 N•m)
• Chainring bolts (steel): 70-95 lb•in (7.9-10.7 N•m) 
• Chainring bolts (aluminum alloy): 72-80 lb•in (8-9 N•m) 

Check the bearings of the bottom bracket. Lift the chain from the 

chainrings, and rotate the crank so that one of the arms is parallel the 
seat tube. Put one hand on the crank arm and one hand on the seat 
tube, and attempt to move the crank arm laterally toward and away 
from the seat tube. Then spin the cranks. If the crank feels or sounds 
loose, or if the motion stops abruptly or you hear a grinding noise 
coming from the bearings, the bearings need to be adjusted or replaced. 

Inspect the crankset for fatigue or impact damage:
• Dents
• Cracks
• Scratches
• Deformation
• Discoloration
• Noise

Figure 2  Tightening pedals

Maintenance