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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).
Remarks on wheel hub and tyre performance during a race.

Identifier  ExFiles\Box 90a\1\  Scan029
Date  16th March 1939 guessed
  
Remarks on the race.

Wheel hubs.

These were hopeless for racing changes.
Both the splines and nuts were too good a fit.
The nuts created an air cushion, which is only released via the threads. The wings were too heavy, and at rt. angles to the hub. They should have been at an angle, away from the spokes of the wheel, and as light as possible.
During the race change, these nuts had tightened up approx. an eighth of a turn.
The splines should also have a lead on the hub, and preferably half the number.
The hubs also require a pilot to receive the nut when spinning.

Tyres. Front - 5.50" Rear. - 6.00".

Dunlop special racing. Showed canvas after 13 laps (155 miles).

12 tyres in all were used, the third set finished the race, with duration of 3 laps (40 miles) left.
  
  


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