introduction
The crankset- left and right crank arms and
chainring(s) (Figure 1), and bottom bracket
(the axle and bearings on which the crankset
rotates)- allows your legs to pedal, transmit-
ting power to the rear wheel.
This section explains how to inspect, adjust,
lubricate your crankset and bottom bracket,
and how to check carbon fiber parts for
damage.
inspecting the crankset and
bottom bracket
Once a month, clean the chainrings and inspect them
for damage. If any teeth are bent or broken, have
the chainring replaced by your dealer. Note that on
some chainrings, a few teeth have a special shape to
enhance shifting.
Every 3 months inspect the crankset, check the
bottom bracket adjustment, and tighten the bolts.
These are maximum torque specifications:
• Crank bolts: 350 lb•in (40 N•m)
• Chainring bolts: 50-70 lb•in (5.7-7.9 N•m).
• Bottom bracket cups: 430-610 lb•in (48.6-68.9 N•m).
• Pedals: 350-380 lb•in (40.2-42.9 N•m)
Turn the right pedal clockwise, but the left pedal counter-
clockwise (Figure 3).
to check the bottom bracket bearing adjustment
1. Lift the chain from the chainrings.
2. Rotate the crank so that one of the arms is parallel to the seat tube.
3. 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.
4. 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 re-
greased by your dealer.
adjusting the crankset and bottom bracket
The Race XXX Lite crankset offers ALS (Adjustable Length System). Refer to the
Installation Instructions.
Adjustment of the bearings in the bottom bracket requires special tools and
training. These services should only be performed by your dealer.
Lubricating the crankset and bottom bracket
Once a year, re-grease the bottom bracket bearings. Some bottom bracket
bearings are permanently sealed and do not require yearly re-greasing. Re-
greasing bearings requires special tools and training, so this should only be done
by your dealer.
Whenever you are installing a threaded part, apply a small amount of bicycle
grease to the threads, except for aluminum chainring bolts. With aluminum
chainring bolts apply a drop of Loctite 222 to the threads.
Figure 2- Drivetrain parts
Chain
Crankset
Crank bolt
Pedal
Cassette
Figure 3 Tightening pedals