Operating instructions

AX-Lightness cranks can be mounted with the stand-
ard shaft into the BB 386 Evo bottom bracket shell.
With a special shaft, they can also be mounted in
standard BB 30 shells.
I
If you have any questions regarding com-
patibility, please contact your AX-Lightness
and engage dealer, call our service centre on
+49 (0)9270 / 91513-0 or send us a mail to
[e-mail] or
[e-mail]
Mounting the cranks in all bottom brackets
Mount the BB30 or BB386 Evo bottom bracket in the
bicycle frame according to the manufacturers‘ in-
structions.
If you have BSA/BSC bottom bracket shells, you must
mount the AX-Lightness bottom bracket rst, as
described in the chapter “Mounting the bottom
brackets in BSA or BSC bottom bracket shells”.
Apply a little high-quality bearing grease onto the
bottom bracket shaft (a).
Insert the shaft from the crank side into the bearing
until the shaft collar is in contact with the bearing (b).
Performing this movement should be free of play, but
not require any force. If it is not free of play, contact
your AX-Lightness and engage dealer. It is possible
that the bottom bracket shell lacks dimensional accu-
racy. In this case it requires a reworking with special
tools, if necessary.
Apply a thin layer of high-quality grease on the spline
shaft section and the crank arm bolt
(c). Approach the
crank to the shaft and make sure the section engag-
es accurately. Turn the bolt by using an Allen key
(d)
and observe, as the crank moves on the shaft. Turn-
ing the bolt should not require any force during the
rst rotations. As soon as the force you need for turn-
ing increases, the AX-Lightness and engage crank is
pre-mounted.
Position the shaft locating washer on the other side
(e) and pre-mount the left crank, as described. Care-
fully check whether the cranks are freely movable and
make sure they do not collide with another compo-
nent.
Finally, tighten both cranks to the recommended
torque value
(f). Lightweight riders can opt for the
minimum torque value whereas stronger and heavier
riders should opt for the maximum torque value.
Finish by checking carefully once again whether the
cranks are easily and freely movable and make sure
they do not collide with another component.
Mounting the bottom brackets in
BSA or BSC bottom bracket shells
AX-Lightness bearing cups are designed for BSC
threads (identier BC 1.37 x 24).
Apply some grease to the bottom bracket shell in the
frame and to the threads and contact surfaces of the
bearing cups (g).
Start by turning in the right side (drive side) three to
four turns by hand. Please note that the right side
has a left-hand thread. Turn in the bearing cups an-
ticlockwise. Then turn in clockwise the cup on the
left side. Once the cups are turned in on both sides
by several rotations, position the AX-Lightness special
tool
(h) on the drive side to tighten them to the re-
quired torque value with a torque wrench. With 35 to
50 Nm the bolted connection of the bottom bracket
requires the highest torque value of all bolts on the
bicycle. Therefore, be sure to use a torque wrench in
this area, too.
Tighten the second cup, as well. Check whether the
cups are accurately seated in the shell. If the cups
are not in full contact, the bearing shell thread must
be re-worked and the surfaces milled to make them
plane-parallel.
Mount the cranks, as described in the chapter
“Mounting the cranks in all bottom brackets”.
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Crank systems - Pedals
a
b
c
d h
g
f
e