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The Presta valve (Fig. 21b) has a narrower diameter and is only found
on bicycle tires. To inflate a Presta valve tube using a Presta headed
bicycle pump, remove the valve cap; unscrew (counterclockwise) the
valve stem lock nut; and push down on the valve stem to free it up.
Then push the pump head on to the valve head, and inflate. To inflate a
Presta valve with a gas station air hose, you'll need a Presta adapter
(available at your bike shop) which screws on to the valve stem once
you've freed up the valve. The adapter fits the end of the air hose fitting.
Close the valve after inflation. To let air out of a Presta valve, open up
the valve stem lock nut and depress the valve stem.
H. Bicycle Suspension
Some Mountain Bikes come equipped with suspension systems which
are designed to smooth out some of the shocks encountered in off-road
riding. There are many different types of suspension systems --- too
many to deal with individually in this Manual. If your bicycle has a
suspension system of any kind, ask your dealer to provide you with
the appropriate adjustment and maintenance instructions.
64
fig. 21B Presta Valve
valve stem
lock nut
2000 owner's manual 10/27/99 10/27/99 11:16 AM Page 64