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19
TUNING THE GEARS - FRONT DÉRAILLEUR
|
LIMIT SCREWS
Limit screws stop the inward and outward travel of the front dérailleur. Limit screws are marked
“L”
&
“H”
.
The L-screw will stop the motion of the dérailleur toward the smallest sprocket. The H-screw will stop the
motion of the dérailleur toward the largest chain ring.
|
ADJUST UPPER LIMIT
Shift the dérailleurs to the largest chain ring on
the rear gears, and the smallest sprocket on the
front gears.
Turn the low gear limit on the top of the dérailleur
with the Phillips head screwdriver to adjust the
dérailleur so that it prevents the chain from coming
off the smallest sprocket. You are looking for a very
small gap.
|
ADJUST LOWER LIMIT
Shift the dérailleurs to the smallest rear sprocket
and the largest front chain ring.
Turn the high gear limit on the top of the dérailleur
to adjust the dérailleur cage so that it just clears the
chain on the largest sprocket.
UPPER LIMIT SCREW (H)
LOWER LIMIT SCREW (L)
STEP
STEP
INFLATING THE TYRES
|
SCHRADER VALVE (SV)
(Sometimes referred to as an American Valve [AV])
A Schrader valve is commonly found on mountain bikes and hybrids. It is also used on cars.
The valve stem is surrounded by a threaded valve cylinder; to press down on the stem, you need to use a tool
like a pen cap or your thumbnail.
Schrader valves are typically wider in diameter and shorter than Presta.
|
VALVE TYPE
To open a Schrader valve, simply unscrew the cap at
the top.
Place the pump on the valve, pump to the required
pressure and remove the pump.
|
PRESSURE
The required pressure is printed on the side wall of
the bicycles tyres
MIN.50/MAX.85 PSI
(Pressure per Square Inch) – This means that the pressure required in your tyre
is no less than 50 PSI and no more than 85 PSI. To accurately see this pressure, you will require a pump
with a pressure gauge.
