September 1, 1919. 



THE INDIA RUBBER WORLD 



689 



CARRYING CAPACITY OF SOLID TIRES. 



This subject has been before the Tire and Rim Division and 

 the Truck Standards Division of the Society for some time, and 

 progress has necessarily been slow as the subject is important 

 from the viewpoints of legislation, truck manufacture and opera- 

 lion and fire manufacture. 



The Tire and Rim Division has approved the following rccom.- 

 mendation in the belief that it represents good engineering prac- 

 tice and presents it for adoption as S. A. E. Standard: 



In presenting this recommendation. Mr. Carlton said that 

 many of those present would remember that when a recom- 

 mendation on the subject of carrying capacity of solid tires 

 was made by the Tire and Rim Division some years ago it was 

 voted down at a society meeting after having been approved 

 by the Standards Committee ; that the last proposed standard 

 is the result of 3 or 4 years of careful e.xperimentation by 

 the rubber companies, and that he believed it deserved the sup- 

 port of the Society; that every manufacturer of solid tires is 

 now in favor of this table, and he hoped the proposal would 

 be approved because it had been difficult to reach a compromise 

 that everyone was satisfied with. As he understood the mat- 

 ter, the carrying capacities recommended in the Division report 

 would be printed in the price-lists of all manufacturers of solid 

 tires, and were in fact being so printed by most of them. 



THE DISCUSSION. 



L. R. Davis: — These are carrying capacities that we have. been 

 using for the past 2 years, except that we have a 3,'4-inch size 

 instead of S'/z. 



C. C. Carlton: — I would like to ask a question of the rubber 

 men present. It is my understanding that solid tires will not be 

 guaranteed for replacement by any manufacturer if they are 

 subjected to greater carrying loads than those given in the re- 

 port. Is that correct? 



Mr. Davis:— That is correct. 



RussEi-L HooPES : — I was a member of the Division when we 

 had the discussion years ago, and it seems to me, now that the 

 tire companies have agreed on this, that it would be a pity not 

 to put it through as an S. A. E. Standard. 



SOLID TIRES FOR SINGLE AND DUAL WHEELS. 



The Division recommends the following definite front and 

 rear wheel application of the proposed solid tire sizes as supple- 

 mentary to the proposed standard list of sizes : 



TIRES FOR SINGLE WHEELS. 



TIRES FOR DUAL WHEELS. 



ale tire fits 36x4 dual wheel) 



nt:le tire tits 36x5 dual wheel) 



40x5 40x10 (.Single tire fits 40x3 dual wheel) 



40x6 40x12 f. Single tire fits 40x6 dual wheel) 



40x7 40x14 (Single tire fits 40x7 dual wheel) 



Mr. Carlton explained ihat this "application" table includes 

 the solitf tire sizes recommended for standard. They are, how- 

 ever, classified in this table to indicate preferable installation 

 for front and rear wheels. Such application would, he said, 



work no hardship upon truck manufacturers and would greatly 

 assist wheel makers who want standards to work to. 



BASE BANDS FOR SOLID TIRES. 



As the proposed solid tire standard includes a 3-inch size, 



the Divis 

 in the pr 



recommends that the 3-inch base band be included 

 It S. .\. E. Standard for base bands for solid tires. 



FOR Solid Tires. 



23/32 344 ±1/32 5/16 16 0.181 2 20/32 3,^ 5/64 



3/4 4'A ±1/32 11/32 18 0.191 3 7/16 3^ 1/16 



25/32 4H ±1/32 3/8 20 0.196 3 59/64 4,^ 9/12S 



27/32 5^ ±1/32 7/16 26 0.189 4 59/64 S-fs 9/128 



27/32 6% ±1/32 7/16 32 0.185 5 59/64 6,V 9/128 



27/32 7U ±1/32 7/16 36 0.192 6 39/64 7 ie 9/128 



7/8 S^A ±3/64 7/16 40 0.196 7 27/32 8 5/64 



7/8 10?S ±3/64 7/16 50 0.196 9 27/32 10 5/64 



7/8 12J^ ±3/64 7/16 60 0.197 11 27/32 12 5/64 



7/8 14H ±3/64 7/16 70 0.197 13 27/32 14 5/64 



tho 



adopted by the War Service 



U. S. A. 



Chairman Bachman stated that at the annual meeting in Feb- 

 ruary this list was adopted and that the proposed action con- 

 templated adding only the dimensions for the 3-inch band size 

 which corresponds to the 3-inch tire just approved. 



SOLID TIRE AND WHEEL DIAMETERS, WHEEL CIRCUMFERENCES. 



In the past there has been some confusion owing to the in- 

 clusion of general information in this standard. In view o£ 

 this the Division has revised the standard so as to include data 

 on the standard solid tire diameters only, and therefore recom- 

 mends the following revised standard for adoption: 



Nominal Outer Actual Diameter 'Actual Circumfer- 



Diameter of Tires. Over Steel Bands. ence Over Steel Bands. 



.\l.i 



26 



Mr. Carlton e.xplained that this recommendation involves 

 merely a revision of page 8, S. A. E. Handbook. Vol. 1, adding 

 no new information and eliminating mention of sizes other than 

 those now adopted as S. A. E. Standard. 



SOLID TIRE SECTIONS. 



The Division recommends that the 3-inch solid tire sectional 

 area be included in the present standard so that it will conform 

 to the proposed solid tire standard. 



'Minimum Total 

 Solid Tire Sectional Area of 



Widths, in. Rubber, Square Inches. 



i'4 6.75 



4 7.75 



5 10.75 



6 13.75 



7 16.75 



8 19.75 



10 25.75 



12 31.75 



14 37.75 



Note — The above values 

 liviiion, .War -Service (~on 

 = !-"ither mill corrugated o 

 ■These felloe circumfcrei 

 ileiances arc shown at tli? 



correspond to those adopted by the Solid Tire 

 mittee of the Rubber Industry of the U. S. A. 



dovetail facings may be used. 

 :es are given with the tolerances neglected. The 



bottom of page 8a. S. A. E. Handbook, Vol. I. 



'Includes both hard and soft rubber. 



