Bontrager Race XXX Lite instruction manual Crank arm removal and installation

Crank arm removal and installation

To remove a crankarm with self-extracting crank bolts, turn the crank bolt until the crank bolt threads disengage from the crankarm. The arm will then slide off the bottom bracket splines.

For cranks without self-extracting bolts, remove the standard bolts and use a crank puller to remove the cranks.

To install a crankarm

1.Lubricate the threads and the bottom bracket axle splines.

2.Align the splines of the axle with the crank arm, and slide the arm onto the axle.

When installing a crankarm, note the alignment of the opposite crank arm.

3.Carefully engage the splines, then start the threads of the crank bolt.

4.Tighten as in Inspect the crankset and bottom bracket.

Bottom bracket removal and installation

A conventional crankset is comprised of a left crankarm, right crankarm, and bottom bracket (Figure 5).

To remove a bottom bracket

1.Remove the crankarms.

2.Using the proper tool, loosen and remove the left ("adjustable") bottom bracket cup.

The left cup is right-hand threaded, and the right cup is left-hand (reverse) threaded.

3.Using the proper tool, loosen and remove the right ("fixed") bottom bracket cup.

To install the bottom bracket	Figure 5- Splined bottom
	bracket axle

Make sure the bottom bracket threads of the frame are clean and in good condition. If necessary, chase and face the threads.

Lubricate all threaded surfaces, the bearing surfaces of the crank bolts, the interfaces between the bearings and axle, and the axle splines. Torque sepcifica- tions are on page 2.

1.Install the right bottom bracket cup with the axle, and tighten.

2.Install the left bottom bracket cup, and tighten.

3.Attach the crankarms and tighten the crank bolts.

4.Check the left crankarm for play.

If there is play, remove both crankarms, grease the contact between the bottom bracket axle and the bearings, and reinstall. It may require installing the cranks several times to eliminate all play.

Additional steps

After installing a crankset, check that there is at least 3mm between any part of the crankset and any part of the frame. If not, a longer bottom bracket axle is required to provide adequate clearance. Also check the adjustment of the front derailleur.