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6 cyl Bristol cars Type 400 to 406 - restoration, repair, maintenance etc

403 Wheel Stud PCD

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Old 30-07-09, 04:57 PM
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Default 403 Wheel Stud PCD

Could anyone tell me the PCD of the wheel studs on a 403

A client of mine has purchased wheels with a 4 1/2" PCD which is a bit on the large side.

Basic measurements would suggest it may be 112mm? 4 3/8" is too small

Thanks Jason
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Old 30-07-09, 08:08 PM
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Default 403 Wheel Stud PCD

Jason,
although I have never measured it , I believe 112mm is correct .
In the BOC Bulletin 41 (Summer 1976) there is mention of 112mm.
It is certainly the same as M Benz of about 10 years ago as a few owners
have sucessfully fitted MB wheels to 401, 403, 405 & 407 here in Australia.
The offset and width is different between the various MB Models .
I assume the 112mm is a carry over from the BMW 326 of 1936, probably a
common German PCD.
Hope this helps
Geoff Dowdle
I
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Old 31-07-09, 05:14 AM
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On the assumption that there are five studs and not four (otherwise measurement would be very easy), the pcd is 1.701 times the distance between two adjacent studs. If the pcd is 112mm the distance between studs should be 65.83mm.
HTH
James
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Old 31-07-09, 05:44 AM
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Thanks for the replys

I have tried the center didtance of two studs (not didtance between) and get 2.572" not 2.591" (65.83mm)

I have machined up a template to 112mm using Zeuz tables to position the holes so will see if this fits

Thanks, J
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Old 31-07-09, 06:06 PM
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Just a quick update.

The 112mm template I made just fitted, but was a bit tight, this was probably due to the holes being 9/16" so no clearance on the threads.

But with a little more measurement the problem became clearer, as James suggested a dim of 2.591" should be obtained by measuring the centers of two adjacent studs. The pair I had previously measured were 2.572 which is what was throwing me.

Measureing all 5 pairs I got 2 at 2.59, two at 2.58 and one at 2.57, so the studs are a bit out but 112mm seems the right size.

Hopefully my clients split rims can be salvaged if he gets them rebuilt with new billet centers to the right spacing.

Thanks, Jason
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