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 lj-ton and 1^-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 i-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 l|-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 
er 
tires on 
machine 
when 
bought. 
039 
SO. 009 
023 
.006 
022 
.011 
030 
.009 
043 
.009 
038 
.014 
Net cost 
per mile. 
Hon and f-ton. . 
1-ton 
1-ton 
1^-ton and l£-ton 
2-ton 
2-ton 
Pneumatic (52 reports). 
Pneumatic (290 reports) 
Solid (79 reports) 
Pneumatic (27 reports). 
Pneumatic (14 reports). 
Solid (14 reports) 
•?0.030 
.017 
.011 
.021 
.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 : 
