Page 299 - Automotive Engineering Powertrain Chassis System and Vehicle Body

CHAP TER 1 0. 1 Tyres and wheels

Fig. 10.1-19 Designs of Continental tyre. (Top) Summer tyre (tyre foot prints, see Fig. 10.1-9) EcoContact EP (size 185/65 R14T) and Sport
Contact (size 205/55 R16W). (Below) Winter tyre WinterContact TS760 (size 185/65 R14T) and WinterContact TS770 (size 235/60 R16H).

10.1.3 Wheels the standard DIN 7824. The designation for a standard
rim, suitable for the 145 R 13 tyre (Fig. 10.1-1) for
10.1.3.1 Concepts example is:
DIN 7824 drop base rim 4:00 B 13
Tyresaredifferentiatedaccordingtotheloads to becarried,
the possible maximum speed of the vehicle, and whether This type of rim used on passenger cars up to around
a tubed or tubeless tyre is driven. In the case of a tubeless 66 kW (90 PS) has only a 14-mm high rim flange and is
tyre, the air-tightness of the rim is extremely important. identified with the letter B. The DIN standard can gen-
The wheel also plays a role as a ‘styling element’. It must erally be dropped.
permit good brake ventilation and a secure connection to In order to make it possible to fit bigger brakes
the hub flange. Figure 10.1-20 shows a passenger car rim (Fig. 10.1-10), more powerful vehicles have larger di-
fitted with a tubeless tyre. ameter rims as follows:
00
series production passenger cars: 14–17 rims
00
10.1.3.2 Rims for passenger cars, light sports cars: –18 rims.
commercial vehicles and trailers
The J rim flange applied here is used on rims from 13 00
For these types of vehicle only well-base rims are pro- upwards and is 17.3 mm high. The rim base can (as
00
vided. The dimensions of the smallest size, at 12 and shown in Fig. 10.1-1) be arranged symmetrically or
00
00
13 diameter and rim width up to 5.0 , are contained in shifted outwards. The rim diameter, which is larger on
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