With reference to the final paragraph of Kent Karslake’s letter about the 1908 Grand Prix Panhard-Levassor in Vintage Postbag, published in your June edition. I have studied photographs of the three team cars taken before the start of the Grand Prix. They show clearly that the driving sprocket on Heath’s, Cissac’s and Farman’s car had 27, 28 and 29 teeth respectively.
The ease with which it is possible to change the overall ratio is, I would have thought, the most likely explanation of why Panhards reverted to Ibis method of final drive in 1908.
John Walker, Laughton