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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).
Modifications for a Silver Ghost chassis without front wheel brakes, detailing changes to wheels, steering lock, and shock dampers.

Identifier  ExFiles\Box 53\3\  Scan030
Date  15th March 1927
  
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BY12/G.15.3.27.

SILVER GHOST CHASSIS WITHOUT F.W.B.

1/- The new wire wheels with wellbase rims will fit existing hubs without alteration.

2/- The left hand lock angle should be altered from 41° to 38°, so that the tyres will clear the hydraulic dampers. The right hand lock need not be altered.

3/- Special instructions will have to be issued for fitting the hydraulic shock dampers on the chassis frame, and certain special parts will be required for fitting these.

4/- New ball pins, nuts, etc. will be required to replace the parts which will be scrapped when dismantling for the lower connection of the shock damper.

5/- To maintain our standard clearances the coachwork over the rear wheels should be cut away to the extent of ¼" which we recommend should be done in all cases if possible.

6/- The front wings will require bulging out locally to provide clearance for the top connection of the shock damper when in the maximum bump position.

7/- It is possible that some slight modifications will be required to the spare wheel carriers, but this point will have to be investigated in each case, since these have been produced by coachbuilders.

In both cases the speedometers will read approximately 3½% higher than with the original tyres.

We are looking into the question of fitting 35" x 6.6" balloon tyres on existing straight sided wheels, and will let you know what alterations, in addition to the fitting of the R.R. shock dampers, will be required.

In regard to the 20 HP, chassis, we are also carrying out similar investigations in connection with the fitting of 33 x 5.7" balloon tyres for straight
  
  


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