Fig O.4 The use of a tyre lever to ease the fire head from the wheel rim
O.6 THE IMPORTANCE OF BALANCE
In order to obtain good steering, it is of importance to ensure that the wheels, with tyres fitted, are in
good balance. To assist this, the tyre manufacturers are now marking their tyres with a white spot in
the neighbourhood of the bead at the lightest point of the cover; similarly, they are marking the inner
tubes with spots to indicate their heaviest point. When tyres are assembled care must therefore be
taken to see that they are assembled with the spots on the cover coinciding with the spots on the tube.
It must be noted, in addition, that special balancing discs are fitted to the inside of the cover casing in
some cases and that these should on no account be removed as the tyre balance will be upset if this
is done. These balance discs are not repair patches and do not indicate any fault in the tyre.
Special balance weights, which cover a range of weights weighing from to 1/2 oz. in steps of 1/2 oz.,
are supplied by the Dunlop Rubber Co. for attachment to the wheel rim under Part Nos. WBW/1 to 7.
The correct balance is 6 in. (dynamic) and zero (static).
The balance weights are fitted to both sides of the wheel.
O.7 FITTING TYRES AND TUBES
Inspect the inside of the cover carefully and remove all dirt. The wheel rim must be clean, free from
rust and undamaged.
Dust the inside of the cover with French chalk. Inflate the tube until it begins to round out, then insert it
in the cover.
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General