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CycleWheels and tyres
96
The tyres allow the cycle to grip the road, transmit the drive and brake forces to the road
surface, and provide cushioning when the road is uneven. Various types of tyre may be
fitted depending on how the cycle is used.
Tyre size is indicated on the sidewall of each tyre. A variety of specifications may be re-
corded here, such as:
The ETRTO size, which is given in millimetres. If 52-559 is indicated on the tyre, then
the inflated tyre is 52 mm wide with an internal diameter of 559 mm. (ETRTO stands
for the European Tyre and Rim Technical Organisation).
The size in inches. If 26 × 2.35 is indicated on the tyre, then the inflated tyre is 2.35"
wide with an internal diameter of 26".
With the exception of tubular tyres and UST tyres, the tyre and rim alone are not airtight.
An inner tube is used to keep air inside the tyre, and this is filled via a valve.
10.1.1 Valve types
Cycles may be equipped with one of the following valve types (see “Illustr.: Valve types”):
Presta valve (PV): secured with a tappet
in the valve, rim hole 6.5 mm/0.26".
Dunlop valve (DV): secured with a union
nut, rim hole 8.5 mm/0.33".
Schrader valve (SV): secured with a tap-
pet in the valve, rim hole 8.5 mm/0.33".
All three valve types have a valve cap to pre-
vent the valve getting dirty.
12
4
3PV DV SV
Illustr.: Valve types (example)
1 Knurled screw
2 Valve tappet
3 Lower knurled nut
4 Upper knurled nut
120


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