690 



THE INDIA RUBBER WORLD 



[September 1, 1919. 



SECTION DIMENSIONS OF SINGLE AND DUAL SOLID TIRE 

 WHEELS. 



The Division recommends that the steel hand thickness for 

 the felloe bands for the 3'/^ and 4-inch tires be changed from 

 34 to 5/16-inch. This action is taken in view of the difficulty 

 experienced by wood wheel manufacturers in having the bands 

 of lighter section stretch on application to the wood wheels, 



thus leaving the felloe bands over 



revised standard reads as follows : 



Noiiiinal 



after appHcation. The 



Mr. Carlton stated that this proposed change called for a 

 steel felloe band thickness for the 3^ and 4-inch sizes of 5/16- 

 inch. This has the unanimous approval of all the wood wheel 

 builders, their contention being that after years of experience 

 it has been found that it is impossible to hold wheels under 

 proper compression with the J4-'nch thick steel band, particu- 

 larly in the case of the larger diameter wheels. 



The table is enlarged to include all present-day information. 

 A slight change in the list of minimum thicknesses of felloe is 

 recommended, to place the minimum thickness of felloe for 

 dual wheels on a 2-inch basis. The minimum thickness of felloe 

 for the 4-inch single size has been changed to 15/^ inches. A 

 resolution was passed at a meeting of the Automotive Wood 

 Wheel Manufacturers Association recently, asking that this 

 change be made in the S. A. E. Standard. 



No tolerance has been recommended by the Division in con- 

 nection with felloe thickness. In machining wood it is neces- 

 sary to have some tolerance. This matter has been very thor- 

 oughly discussed by wood wheel makers. A 2-inch plank, say, 

 is used green in the beginning. When it is dry and the neces- 

 sary planing has been done, it is next to impossible to get a 

 full l^-^-inch thickness. The wood wheel manufacturers request 

 that in addition to this table a thickness tolerance of ± ;4-inch 

 be adopted for all sizes. 



ed list of pneu- 



The Division recommends the following 

 Matic tire and rim sizes for passenger c 

 ►ehicies : 



and commercial 



Type 



Tyi 



of R: 



Note — These tire and rim sizes conform 

 •.he National Automobile Chamber of Comm^ 

 18, 1919) and the Rubber Association of America 

 they will be the only sizes used by automobile 

 I, 1920. 



"The tolerance for the felloe is ■+■ t^-inch. 



Clincher 



Straight side 



Straight side 



Straight side 



Straight side 



Straight side 



Straight side 



Straight side 



Straight side 



he joint recommendation of 



(Bulletin No. 267, February 



hich contemplates that 



acturers after January 



WOOD FELLOE DIMENSIONS FOR PNEUMATIC TIRE RIMS. 



The Division recommends that the dimensions for the sizes 



marked with an asterisk be included in the present standard as 



given in the following table : 



Wood Felloe Dimen'sions. 



anTilim Sue. Width. Depth. 



30x3'/2 l!i VA. + 1/16.—0 



32x3'A I'A 154,-fl/16,— 



*32.x4 m l<A.+ \/i6.-^ 



33x4 m 154,4-1/16.-0 



'32x4-^ 2'A l>^,-fl/16,— 



34x4j4 2'A 154,-1-1/16.— 



36x6 3-A 1H±1/16 



38x7 3 29/32 1^±1/16 



4i.xS 4'A IH±1/16 



•44x10 55-4 IH±1/16 



Dimensions in inches. 



Notf — The above values correspond to those adopted by the Automotive 

 Wood Wheel Manufacturers' Association. 



CARRYING CAPACITIES AND INFLATION PRESSURES OF 

 AUTOMOBILE PNEUMATIC TIRES. 



The Division recommends for S. A. £. Standard the following 

 revised and expanded table of carrying capacities for fabric and 

 cord passenger tires and for cord commercial vehicle tires. 



Fabric Tires for Cord Tires for Cord Tires for 



Passenger Cars. Passenger Cars. Commercial Vehicles. 



Corre- Corre- Corre- 



Maxi- spond- Maxi- spond- Maxi- spond- 



Tire mum Load ing Air mum Load ing Air mum Load ingAir 



Size. Per Tire. Pressure. Per Tire. Pressure. Per Tire. Pressure. 



570 



50 



4/ l.lOn 75 1,200 70 1,200 75 



5 " 1,500 85 1,700 80 1,700 80 



fi . . ... 2,200 90 



7 . . ... 3,000 100 



8 .. ... 4.0O0 110 



89 .. ... 5,000 120 



nu .. ... .. 6.000 130 



SOLID AND PNEUMATIC TIRE EQUIPMENT FOR COMMERCIAL 



VEHICLES.' 



As it is desirable for all tire manufacturers to make identical 

 tire equipment recommendations, this matter has been the sub- 

 ject of frequent discussions, and at this time the Division feels 

 that it can present a table which will more or less summarize 

 the result of past activities and represent good practice. 



In this table in the columns headed "Maximum Weight per 

 Wheel" the figures given are the result of very careful investi- 

 gation as to actual weights of trucks in use at the present time. 

 It was found that trucks of light weight capacity did not deviate 

 much on the average weight figures, so that it is felt that while 

 the tire equipment stated for each weight truck will not be 100 

 per cent correct, it will cover more than 95 per cent of the cases. 

 Front. Rear. 



Maximum Pncu. Maximum Pneu. 



Size Wt. per Tire Solid Tire Wt. per Tire Solid Tire 



Trucli. Wheel. Size.^ Size. Wheel. Size.' Size. 



54 800 33x4 or None 160O 35x5 None 



35x5 



1 1000 34x4 J4 34x3 J^ or 2100 36x6 34x5 or 



36x3 J4 36x5 



11/ 1200 r4x4'A 34x3'/! or 3000 38x7 36x6 



36x3^ 



2 1500 35x5 34x4 or 3500 40x8 36x7 



36x4 

 2yi 1800 36x6 36x5 4000 40x8 36x7 



3 20OO 36x6 36x5 520O 44x10 36x5D 



36x10 



lyi 2100 36x6 36x5 570O 44x10 40x5D 



40x10 



4 2300 38x7 36x6 6500 48x12 40x6D 



40x12 



5 2700 38x7 36x6 7800 48x12 40x6D 



40x12 



''The loads and pressures for these sizes are S. A. E. recommended prac- 

 tice ouly. 



'This report has been referred back to the Tire and Rim Division. These 

 data are submitted, however, as general information only, as representing 

 good present-day practice. 



*A11 pneumatic tires to be of cord construction. 



