From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Design drawing for a 6.50/17 tyre tread pattern.
| Identifier | ExFiles\Box 157\6\ scan0165 | |
| Date | 1st May 1927 | |
| BORING MILL ENGRAVING M/C 2.398" 1.671 .187 .078 STARTING LINE 6.1236 = 1/2 SECTION 12.2473 = 1 SECTION KNIFE CUTS AS INDICATED THIS DIMENSION MEASURED ALONG 25 1/4 DIA. Pattern Labels: 1A, 2A, 3A, 4C, 5C, 1B, 2B, 3B, 1C, 2C, 3C, 1/2 1B, 1/2 2B, 1/2 3B, .85T & S.3A, .88T & S.5C Dimensions: .25, .125, 5 1/8, 5 1/16, 5 3/8 R, 6 1/4, 5.325 ARC, 1/32, 3/32, 1/16, 3/8, 31 1/16 DIA, 30 1/4 DIA, 25 1/4 DIA. Table 1: PITCH TYRE SIZE 6.50/17 DIMENSION X, Y PITCH OR BUTTON LETTER A, B, C Column 1: 1.3472, 1.3472, 1.3472 Column 2: 1.5309, 1.5309, 1.4391 Column 3: 1.7146, 1.7146, 1.5309 Table 2: BUTTON PITCH S: 1.6827, 1.7146 1: 1.0972, 1.1597, 29° 30M, 29° 30M, 1.1597, 1.0972 2: 1.2809, 1.2586, 28° 30M, 28° 30M, 1.2586, 1.2809 3: 1.4646, 1.3484, 27° 37M, 27° 37M, 1.3484, 1.4646 4: 1.6484, 1.4352 5: 1.5271 Bottom Row: 24.02, 25.92, 27.82, 29.72, 31.62 Title Block: THE INDIA TYRE & RUBBER COMPANY LTD. INCHINNAN, SCOTLAND TITLE: INDIA SUPER 'BENTLEY' 6.50/17 TREAD DESIGN DATE: 1-5-27 SCALE: FULL SIZE DR: W.H.M. D.R.: S.R. 127/17 B | ||