EXPERIENCE WITH MOTOR TRUCKS. 



25 



by 4 to get the cost for four tires. According to the estimates of 

 310 men the pneumatic tires on these trucks run on the average 

 4,400 miles, and the estimates of 161 men show that the solid tires 

 run 7,700 miles. So few of the -| and f-ton trucks are equipped 

 with solid tires and so few of the owners of 1^-ton and l|-ton trucks 

 reported concerning the cost and mileage of solid tires that no figures 

 for solid tires for these sizes are given. 



Since the cost of the tires with which a truck is equipped when 

 purchased is included in the first cost of the truck, an allowance must 

 be made for the number of miles which these tires run in order to de- 

 termine the net tire cost to the user. 



According to the estimates of these men the percentage of the 

 total mileage of the trucks obtained from the tires with which they 

 are equipped when purchased is as follows : 



Pneumatic tires on the J-ton and f-ton trucks run 23 per cent of the 



total mileage. 

 Pneumatic tires on the 1-ton trucks run 25 per cent of the total 



mileage. 

 Solid tires on the 1-ton trucks run 48 per cent of the total mileage. 

 Pneumatic tires on the lj-ton and l^-ton trucks run 29 per cent of the 



total mileage. 

 Pneumatic tires on the 2-ton trucks run 22 per cent of the total mileage. 

 Solid tires on the 2-ton trucks run 36 per cent of the total mileage. 



The cost per mile as indicated by the cost of tires and the number 

 of miles which they run has been reduced by these percentages in 

 order to obtain the net cost per mile traveled. No attempt was made 

 to ascertain the cost of inner tubes for pneumatic tires, nor to obtain 

 the cost of tire repairs separately from the entire repair costs of the 

 trucks. 



Table XIX. — Tire costs. 



Size of truck. 



Kind of tires. 



Cost per 

 mile. 



Allow- 

 ance for 

 tires on 

 machine 

 when 

 bought. 



Net cost 

 per mile. 





Pneumatic (52 reports) 



Pneumatic (290 reports). . . 



80.039 

 .023 

 .022 

 .030 

 .043 

 .038 



$0,009 

 .006 

 .011 

 .009 

 .009 

 .014 



?0.'030 





.017 





.011 





Pneumatic (27 reports) 



Pneumatic (14 reports) 



.021 



2-ton 



2-ton 



.034 

 .024 









KINDS OF TIRES RECOMMENDED BY USERS. 



These truck owners were asked what kind of tires they consider 

 best for their conditions, regardless of the kind they are now using. 

 The kinds of tires which 684 men with trucks of all sizes are now 

 using and the kinds which they have decided are best are as follows : 



