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Original Dunlop D1 Offset


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#1 Mini Manannán

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Posted 15 May 2024 - 04:43 PM

Does anyone know what the offset on original D1's is? Been looking but can't find the numbers.  I know the modern JBW copies are 25mm, are they the same?



#2 GraemeC

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Posted 15 May 2024 - 05:54 PM

They were designed for drum braked cars, so needed arches to run on a Cooper S.
+17 or +19 are the figures that come to mind, but I've nothing to base that on other than a hazy memory!



#3 Lplus

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Posted 15 May 2024 - 08:02 PM

Does anyone know what the offset on original D1's is? Been looking but can't find the numbers.  I know the modern JBW copies are 25mm, are they the same?

modern JBW 5x10 D1s are 17mm.
 



#4 timmy850

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Posted 15 May 2024 - 09:42 PM

Fitting a 5x10 wheel to a drum braked mini with no arches mean they need to be in the 15-20 offset range as mentioned by Graeme. 

 

One strange thing to note about the original Dunlop LP922 alloys is the bead profile is "C". Most normal passenger cars are "J" and some other mini wheels are "B" profile. 

 

https://mk1-performa...uk/Dunlop-D.pdf

https://www.ebay.co....tm/285847090756

Attached File  bead-profiles.jpg   27.7K   2 downloads



#5 Mini Manannán

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Posted 16 May 2024 - 05:31 AM

 

Does anyone know what the offset on original D1's is? Been looking but can't find the numbers.  I know the modern JBW copies are 25mm, are they the same?

modern JBW 5x10 D1s are 17mm.
 

 

 

Not according to JBW's site?: https://johnbrownwhe...1-4x1016-5012D1



#6 Mini Manannán

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Posted 16 May 2024 - 05:41 AM

Perhaps I should have mentioned I'm using the standard 8.4 disc set up and the D1s I have fit nicely. But they're dated as 1969 and are starting to show their age. I'm thinking of a new set of shiny wheels hence the question.



#7 GraemeC

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Posted 16 May 2024 - 06:28 AM

Ah! 12" D1s then. 

I'd assumed you were asking about 10" - I don't think the 12" were meant for the Mini back in '69.

 

Are the ones you have 5" or 4.5"?

If 5" they are probably Hillman Imp wheels, if 4.5" they are probably Austin/Morris 1100/1300.

 

If you have the wheels can't you measure the offset?

 

https://mk1-performa...uk/Dunlop-D.pdf


Edited by GraemeC, 16 May 2024 - 06:34 AM.


#8 timmy850

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Posted 16 May 2024 - 08:24 AM

The AD016 used a different bolt pattern, so wouldn’t fit a mini. Hillman imp or possibly Vauxhall viva?

#9 Mini Manannán

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Posted 16 May 2024 - 01:27 PM

Ah! 12" D1s then.
I'd assumed you were asking about 10" - I don't think the 12" were meant for the Mini back in '69.

Are the ones you have 5" or 4.5"?
If 5" they are probably Hillman Imp wheels, if 4.5" they are probably Austin/Morris 1100/1300.

If you have the wheels can't you measure the offset?

https://mk1-performa...uk/Dunlop-D.pdf

Doh, didn't mention 12"X5" vital statistics. We had a go at measuring the offset but 8mm seems a little low. Maybe?

Edited by Mini Manannán, 16 May 2024 - 01:27 PM.


#10 Lplus

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Posted 16 May 2024 - 04:22 PM

 

Ah! 12" D1s then.
I'd assumed you were asking about 10" - I don't think the 12" were meant for the Mini back in '69.

Are the ones you have 5" or 4.5"?
If 5" they are probably Hillman Imp wheels, if 4.5" they are probably Austin/Morris 1100/1300.

If you have the wheels can't you measure the offset?

https://mk1-performa...uk/Dunlop-D.pdf

Doh, didn't mention 12"X5" vital statistics. We had a go at measuring the offset but 8mm seems a little low. Maybe?

 

Seems exremely low unless you have wheel spats.   Measuring method here.

 

https://www.oponeo.c...ffset-explained

 



#11 Midas Mk1

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Posted 16 May 2024 - 06:09 PM

I’ve got 12” d1’s from an imp, far greater negative offset than the repos. You’d be disappointed going to them,far less of dish on the spokes.




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