Bike is 2006. year and almost new, but was too long without ride , or ride rarely, never greased axles. Wheels turns relative freely.There is too much effort pedaling, even in a low gearing, after shorter ride I have pains in knees , leg muscles, ,although I am in good riding condition and with other bikes could run 50-60 miles without problem.
If the wheels spin free then I would look at the bottom bracket. All of the force you use for pedaling relies on the bearings in the bottom bracket being good. Are the pedals hard to turn by hand? Do the pedals themselves spin freely? If the wheels turn, this really only leaves these two rotating points as possible suspects.
SOURCE: I need to source new
I googled "bike spokes 178mm" and a bunch came up. Same-o for 180mm.
Google "bicycle spoke calculator" and you will find many sites that help determine the lengths.
Testimonial: "I failed to get your results. I found a cycle shop that rolled spokes to order. CYCLES BRANKSOME in Poole. BH12 1DQ Tel 01202 769202 (75p per spoke)"
SOURCE: I have 3900 disc brake.
the noise from the rear disk is from a small amount of dirt lodged in the brake pad. it will clear soon and the noise will go away. You may want to check the alignment of the brakes... google "shimano disk brake alignment" then click "images" to see how.
If the tyre is not leaking any more then the repair is ok, if the tyre goes flat, you should change the tube.
Use
a flat screwdriver to unseat the tabs that hold the front top cover
in place. This will expose the flywheel and pedal arm connection
points. Rotate the flywheel by hand and determine whether lubrication
will accomplish the repairs. If the bearings are exposed, use a
grease gun with an extension nozzle and lubricate both bearings with
lithium grease. If the bearings are damaged or sealed, proceed to the
next step.
Remove
the front and side covers on the main frame. Hold the flywheel with
one hand and use a box wrench to loosen the bolts that secure the
pedal arms at each side of the flywheel. Pull the arms away from the
flywheel and remove the bearings from each side.
Test
the bearings as before. Lubricate exposed bearings with lithium
grease and reinstall them. Sealed bearings must be replaced. Reattach
the pedal arms to the flywheel. Replace the main frame covers and
front top cover to complete the repairs.
Prepare
to oil by filling a grease gun with lithium grease. Check your
owner's manual for the exact type of grease for your unit.
Locate
where it is you need to lubricate. Focus on the bearings, free-moving
joints and attachments with moving parts such as handle bars, wheels,
pedals arms and guide rails. Go to each location one by one when
greasing.
Unfasten
the bolts or screws that hold the joint or attachment that you wish
to lubricate.
Grease
each bolt and screw liberally. Tighten each bolt and screw back into
its place when finished.
Wipe
away any excess greas
Remove
the screws or bolts securing the ends of the pedals to the crank
axles. Slide the ends of the pedals off the axles. Remove any screws
or bolts securing the left and right disc shields to the base unit.
Pull or pry the disc shields off the base unit and set them aside.
Remove
any screws or bolts securing the left and right side shields to the
base unit. Detach the side shields and set them aside. Examine the
interior of the base unit and locate the drive belt.
Pull
the drive belt free of the crank pulley, flywheel and any other
pulleys. Discard the old drive belt and install a new belt in its
place. Turn the crank axles by hand to confirm that the belt will
turn smoothly when the device is in use
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