COST 334

Table 4.12 to Table 4.16 give information from various sources on footprint size forseveral tyre types. Please note that substantial differences may occur between tyres of thesame nominal size but of different manufacturers or even of different types (structure,tread pattern, materials) for the same manufacturer. Due to constant development, thesevalues may also change over the years. Differences between the given values may also bedue to differences in measurement methods between authors, or to measurementvariability.Table 4.12 - Tyre footprint size of some Michelin tyres (Penant 2000b)Tyre size Fitment Load pertyre (kg)P (bar) Width 1(mm)Length 1(mm)Area 1(cm²)295/60R22.5 dual 2250 8 258 155 399295/60R22.5 dual 2875 10 259 165 427295/80R22.5 dual 2250 7 243 170 413315/80R22.5 dual 2250 6.5 253 179 453315/80R22.5 dual 2875 8 253 193 490385/65R22.5 single 4500 10 284 202 574385/65R22.5 Energy single 4500 10 302 193 583495/45R22.5 single 4500 8 425 161 686495/45R22.5 single 5750 10 426 173 7371 Width and length values are averaged over the contact area envelope, soArea = width*lengthTable 4.13 - Tyre footprint size of some Michelin tyres (Theis 2000)Tyre size Fitment Loadper tyreInflation Max.pressure width 1Max.length 1Grossarea 1(kg) (bar) (mm) (mm) (cm²)Netcontactarea (cm²)Net/grossarea(%)295/60R22.5 dual 2875 9.5 258 205 472 309 65.5315/80R22.5 dual 2875 7.5 258 247 532 351 66.1385/65R22.5 single 4500 9.5 283 232 579 415 71.7385/65R22.5 single 5750 9.5 283 256 681 505 74.1495/45R22.5 single 5750 9.5 427 213 709 535 75.41 NB! Gross contact area or footprint area is considerably smaller thanmax.width*max.length, mainly due to strongly irregular footprint length50version 29 November 2001