Specifications
5
Caution: Never touch the chain with a cloth our your hand while the chain is moving. Use the 4-
mm Allen wrench to remove the 3 screws of the outer chain guard and take off the guard. Use the 14-mm
wrench to loosen each of the axle nuts. Use the 10-mm wrench to turn each of the chain tensioner bolts to
the left 2 half turns. This will loosen the chain tension enough to facilitate removal later. Carefully take the
chain off the right crank sprocket. Remove each crank bolt using the 8mm Allen Key wrench. Be certain to
remove the crank bolt washer from the crank arm before proceeding with the next step. Insert the ISIS
Insert plug into the BB spindle, thread into spindle using 8mm Allen Key until it is flush with the end of the
spindle. Screw the crank puller into the right crank arm snug the crank puller to the crank using an
adjustable wrench, turn the arm of the puller clock-wise until the crank slides off (repeat this step for the left
crank arm). Use your Bottom Bracket tool for ISIS Overdrive (#71717) with you adjustable wrench to
remove the “non-drive side” BB cup first. (The non-drive side BB is right hand threaded). Turn the wrench
counter clock-wise (left) to remove the cup. Repeat this step on the “drive side” of the bike (sprocket side),
this time turning the wrench clock-wise (right) to loosen the cup. (This cup is REVERSE threaded.) Before
putting the new bottom bracket into the frame, it is a good idea to inspect the threads for damage and to
apply blue LocTite to the cups for best results.
Install the new BB by threading the cartridge in from the drive side first. Carefully thread the BB in by hand
to ensure you do not cross the threads (remember the drive side threads are REVERSE, so turn the BB
counter clock-wise to tighten.) Use your torque wrench and BB tool to apply 570 lbf/in. (48 lbf/ft.). Repeat
this step on the non-drive side, remember the non-drive side BB threads are standard and tighten in the
clock-wise direction. Torque non-drive side BB cup to 570 lbf/in. with the torque wrench. Replace the crank
arms and torque crank bolts to 480 lbf/in . Carefully rotate the chain back onto the sprocket and retighten
the chain tensioner bolts. Be sure to tighten each bolt evenly so the flywheel stays aligned with the frame.
Reinstall the chain guard, make sure the chain tension and flywheel alignment are correct, (for instructions
on this, see the procedure on how to change a chain above.)
HOW TO CHANGE THE LEFT CRANK ARM OF THE SCHWINNINDOOR CYCLING BIKE
Tools needed
1. Pedal Wrench (SCHWINN Part -#71695)
2. 8-mm Allen wrench
3. Torque Wrench
(#74523) w/ 8mm Allen Key
Socket
4. Crank Puller (#71699)
5. Adjustable Wrench
6. 3/8” Socket Wrench
7.
ISIS Insert Plug for Crank Puller, M12 x 1.0
(#71715)
Procedure
Remove the left pedal using the 15-mm side of the pedal wrench, by turning wrench (clockwise) toward the
back of the bike. Remove the crank bolt using the 8mm Allen Key wrench, be careful to also remove the
washer from inside the crank arm before proceeding to the next step. Insert the ISIS plug into the spindle,
using the 8mm Allen Key wrench, thread the plug into the spindle until it is flush with the spindle end.
Thread the crank puller into the left crank arm, snug crank puller down using an adjustable wrench. Rotate
the handle of the puller clockwise until the left crank comes off. Apply a liberal amount of grease to the
spliced ends of the ISIS Overdrive spindle, it is MANDATORY that these splines be well greased before
installing the crank arm. Place the new left crank onto the bottom bracket. Grease the threads of the crank
bolt and tighten the crank bolt to 480 lbf/. Re-lube the threads of the left pedal and tighten turning the
pedal wrench toward the front of the bike (counterclockwise).
HOW TO ADJUST THE NEW ADJUSTABLE SMART RELEASE™MECHANISM
Tools needed
1. Smart Release™ Adjusting Tool (SCHWINN Part -#71709)
Procedure