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ROYAL ENFIELD 350cc and 500cc O.H.V. WORKSHOP MANUAL
taken that they are built the right way round into the
wheel.
13. Spokes
The spokes are of the single butted type 8-10
gauge with 90° countersunk heads, angle of bend
95°-100°, length 6.5/8 in. brake drum side, 8.1/2 in.
spoke flange side, thread diameter .144 in., 40
threads per inch, thread form British Standard Cycle.
14. Wheel Building and Truing
The spokes are laced one over two on the brake
side and one over three on the spoke flange side of the
wheel. The wheel must be built central in relation to
the faces of the nuts on the spindle. The rim should be
trued as accurately as possible, the maximum
permissible run-out both sideways and radially being
plus or minus 1/32 in.
Figs. 4A and 4B show the difference between the
lacing when using Dunlop and Palmer rims. The key
to correct lacing is the inside spokes to the large
flange on the brake drum side which must slope in the
direction shown in Fig. 4. With the Dunlop rim this
spoke goes to the middle hole of one of the groups of
three (see Subsection 12) and the rim must be built
into the wheel so that these groups of three holes are
on the right of the centre line when the brake drum is
on the left, i.e. the inside spokes to the large flange
cross from the left to the right of the centre line.
Page 56
With the Palmer rim the spokes from the large
flange on the brake drum side go to the more steeply
angled holes in the rim which must be on the left of
the centre line when the brake drum is on the left, i.e.
none of the spokes crosses from left to right of the
centre line.
15. Tyres
Standard tyres on the "250 Clipper" and "Model
S" are Dunlop 3.00-19 in. Lightweight Reinforced
and on the other models Dunlop 3.25-19 in. Ribbed.
When removing the tyre always start close to the
valve and see that the edge of the cover at the other
side of the wheel is pushed down into the well in the
rim.
When replacing the tyre fit the part by the valve
last, also with the edge of the cover at the other side
of the wheel pushed down into the well.
If the correct method of fitting and removal of the
tyre is adopted it will be found that the tyres can be
manipulated quite easily with the small levers
supplied in the toolkit. The use of long levers and/or
excessive force is liable to damage the walls of the
tyre. After inflation make sure that the tyre is fitting
evenly all the way round the rim. A line moulded on
the wall of the tyre indicates whether or not the tyre is
correctly fitted. If the tyre has a white mark,
indicating a balance point, this should be fitted near
the valve.
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