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).
Letter from Dunlop Rubber Co. to Rolls Royce discussing the balancing of wheels and tyres.
| Identifier | ExFiles\Box 28\4\ Scan330 | |
| Date | 21th August 1925 | |
| Copy The Dunlop Rubber Co.Ltd. Fort Dunlop, Erdington. Birmingham. Development Supt. 21st August, 1925. Messrs Rolls Royce Ltd. Derby. Dear Sirs, Balancing Wheels and Tyres. ----------------------- Your two letters of the 17th and 18th inst. This subject has had our close and continuous consideration. We have been carrying out tests here and have been in continuous touch with your Technical Staff at Derby. We quite appreciate the importance of the most effective balancing of the various units of tyres and wheels. We are arranging to take the following steps:- a/- To ensure that the wheels themselves are in the most perfect balance as manufactured. b/- To test all covers for balance, and to only issue to you covers which shall be within an agreed error of balance. c/- Inner tubes - The method of manufacture provides a tube which in itself will not be more than 1-1/4 ozs. out of balance. That includes the valve seating and the join, but as you will appreciate the tube cannot be well treated except in conjunction with the valve which in itself is responsible for an error of balance of at least 3 1/2 ozs. We do not think the valve can be satisfactorily balanced in the tube, but submit that the most practicable way to balance the valve is by providing a suitable dummy bolt attached to the rim opposite to the valve, and in balancing the valve at this point the 1-1/4 ozs. error in the tube itself can quite readily be taken care of. Contd. | ||