Bosch BULLS 650-185, Operating Instructions Manual

Page: 89 / 238

88
Operation
6.5.8
Tires
It is not possible to offer a general
recommended
tire
pressure for a particular
ebike
or
tire
. The correct
tire
pressure largely depends
on the weight load on the
tires
, mainly
determined by body weight and baggage.
Unlike cars, the weight of the vehicle has only a
small impact on the total weight. Moreover, the
personal preferences for low rolling resistance or
a high degree of suspension comfort vary a great
deal. It is important to remember that
•
T
he higher the
tire
pressure is, the lower the wear,
rolling resistance and the risk of breakdown are.
• The lower the pressure in the
tire
is, the greater
the comfort and grip that the
tire
offers is.
In the case of
ebikes
used on the road, the rule is
the greater the
tire
pressure is, the lower the
tire
rolling resistance is. The risk of breakdown is
also lower when the pressure is high.
A permanently excessively low
tire
pressure often
leads to premature wear in the
tire
. Cracking in
the side wall is a typical consequence of very low
tire
pressure. Abrasion is also unnecessarily
high.
On the other hand, a
tire
can absorb road impacts
more effectively at a low pressure.
As a general rule, wide
tires
are operated at a
lower
tire
pressure. They provide the
advantages of the lower
tire
pressure without
the serious disadvantages it causes with regard
to wear, rolling resistance and
flat
protection.

Never exceed or go below the minimum and
maximum pressure limits indicated on the
tire
.
1 Pump the
tire
to the recommended
tire
pressure.
Figure 87: Correct
tire
pressure. The
tire
is barely
deformed under the load of the body weight
Figure 88: Much too little
tire
pressure
Tire
width
Tire
pressure in bar for body weight
about
130 lbs
about
175 lbs
about
240 lbs
25 mm 6.0 7.0 8.0
28 mm 5.5 6.5 7.5
32 mm 4.5 5.5 6.5
37 mm 4.0 5.0 6.0
40 mm 3.5 4.5 6.0
47 mm 3.0 4.0 5.0
50 mm
/2.0"
2.5 4.0 5.0
55 mm
/2.1"
2.0 3.0 4.0
60 mm
/2.35"
2.0 3.0 4.0
Table 33: Recommended
tire
pressure for Schwalbe
2 Perform a visual check on
tires
.