CSC SG250 - Wheel and Tire Inspection; Wheel and Tire Troubleshooting; Fixing Flat Tires

SG250 Owner’s and Service Manual
www.CSCMotorcycles.com
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Rear wheel installation is the reverse of removal. The rear axle nut should be torqued to 35 ft-lbs.
When the rear wheel is installed, the chain should be adjusted and the rear wheel should be
aligned. These maintenance activities are addressed in the chain adjustment and wheel alignment
section of this manual.
Wheel and Tire Inspection
Check if the tire air pressure is at the specified value (40 psi front and 36 psi rear). Inspect the valve
stems for security, and valve stem condition. Do not operate the motorcycle without the valve stem cap
in place. Inspect the tire condition. Warning! Replace any tire with tread that is worn down to the
tread wear indicator (or if the tread remaining is less than 2mm), if the tire exhibits cupping, or if the tire
has any other defects.
Inspect the spokes on both the front and the rear wheel. If any spokes are loose, tighten them and
check for wheel trueness. If any spokes are missing, replace them. The entire wheel should be relaced
at the next available opportunity.
Check the rims for dents. If the rim is dented, it should be replaced.
When the wheels are removed from the motorcycle, check the grease seals, the wheel bearings, and
other components. If the grease seals are cut or torn, they should be replaced. If the wheel bearing
inner races are loose, gritty when rotated, or noisy, replace the bearing.
Place the wheels on a truing stand and inspect them for runout and ovality. If either exceeds 1.0mm,
true the wheel by adjusting spoke tension.
Balance the wheel and tire on a dynamic balancer.
Wheel and Tire Troubleshooting
Item
Symptom
Cause
Vehicle Effect
Maintenance Action
Wheel and
Tire
Vibration
Deformation, out of balance
condition, worn tire, wheel
trueness or ovality outside of
spec limits, worn bearing,
motorcycle load
Drift,
handlebar
shake,
vibration
True wheel, check bearings, check
inflation pressure, check tire
condition, balance tire and wheel,
check for proper loading of
motorcycle
Tire
Premature
wear,
cupping
Out of balance, misaligned rear
wheel, worn bearing, under or
over inflated.
Premature tire
wear
True wheel, check bearings, check
inflation pressure, balance tire
and wheel, check for proper
loading of motorcycle
Fixing Flat Tires
If your motorcycle has a flat tire, check for any obvious causes on the outside of the tire (it will make
finding the leak in the tube easier).