Joined: Aug 2017 Posts: 1,746 Threads: 42
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Location: Malvern, Victoria, Australia
By Jove I think you have it- the rear assembly would require a centering peg through those strange front holes when the front disc is held on by the plated nut.
I understand the discs were removed after a few test runs.
Joined: Aug 2017 Posts: 2,748 Threads: 31
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Location: Auckland, NZ
31-05-2020, 05:40 AM
(This post was last modified: 31-05-2020, 07:29 AM by Bob Culver.)
If I have got it correct, the tripod thingy must be removable but tensioned against the wheel centre, yet seems to be just twisted wire. All has to be accurately centred, repeatable and secure to obtain and retain balance, hence the drilling. At 100 mph in a Seven would have enough else to worry about without a disc possibly flailing loose.
Joined: Aug 2017 Posts: 926 Threads: 74
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Location: Essex
It may even be a small bolt passes from the inside to secure the small central disc before attaching the rear disk with the three struts... but there is definitely no need for a captive nut.
Joined: Aug 2017 Posts: 3,394 Threads: 106
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Location: Darkest Bedfordshire
I reckon Nick is right. That hole certainly isn't going to do a lot for brake cooling!
Joined: Nov 2017 Posts: 250 Threads: 2
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Had a feeling this hole business has come up before on the Friends site. Doubt all the previous theories (especially the racing or sports connection) except perhaps the stacking idea. Have come across dozens of drilled wheels over the years - too many to have any competition connection? Cheers, Bill in Oz
Joined: Aug 2017 Posts: 919 Threads: 18
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Location: North Yorkshire
I would think that many wheel centres were drilled to take the dummy 'knock-on' aluminium spinners.
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Montauk 1939.
Regards,
Stuart