COST 334

Table 4.65 - TCF values for steering axlestyrewidthcont.areawidthtotalwidthTyre Configuration FactorPrimary Secondary roadsroadsprimaryruttingdiameterweightedaverageprimaryruttingsecondaryruttingfatigueTyre size Fitment mm mm mmRef. tyre dual 235 470 570 1059 1.00 1.00 1.00 1.00 1.0011.00R20 1 single 207 207 207 1086 3.76 7.51 3.76 13.51 3.3812R22.5 single 201 201 201 1085 3.95 8.02 3.95 14.57 3.51295/60R22.5 single 244 244 244 924 3.44 5.55 3.44 8.85 3.32295/80R22.5 single 235 235 235 1059 3.14 5.72 3.14 9.75 2.97315/70R22.5 single 253 253 253 1024 2.89 4.93 2.89 8.06 2.82315/80R22.5 single 247 247 247 1085 2.81 5.08 2.81 8.58 2.72385/55R22.5 single 329 329 329 998 1.91 2.78 1.87 3.98 2.04385/65R22.5 single 285 285 285 1071 2.23 3.64 2.19 5.76 2.251 Used frequently in the past, now almost obsolete4.8.5 Overview of average TCF values of the common current and possible futuretyresTable 4.66 summarizes per axle type the average values of the contact area width, the tyrediameter and the according TCF values for the common current and possible future tyres(with 19.5 and 22.5 inch rim).The calculation of the average values is based on the range of tyres as used in the previoustables, with the exception of the following tyres:• the obsolete tyres which have been marked with a footnote in the previous tables,• the 11R22.5 dual tyre for use on driven axle, because of the very low share (lower than5%) of this tyre (see Glaeser 1998 and Nieuwsma 1999), in combination with the largedifference in TCF value with the more popular ones.• the 315/80 dual tyre for use on towed axle because of a very low share of this tyre incombination with the large difference in TCF value with the more popular ones.140version 29 November 2001