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 Austin Mini Cooper S 1275 MK1 Front & Rear Track

 Created by: Bel1
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 Posted: Feb 10, 2022 04:35AM
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Hi,
thank you all for the answers!
We found the first problem:
- we have two wheels type 3.5 x 10 but whit wrong Offset: OE Number 21A881 & 21A2744 whit Offset 24/ 29
the right wheels is 21A1282 ET 45 = 30-40mm less track!

The front track is ok.
We still have a problem on the rear: our Mini has spaced drum whit 1" spacer inegrated. In 2 different website i found 2 different information.
On limora.com website the 1" spaced drum is indicated as standar for Cooper S
https://www.limora.com/it/marchi-inglesi/mini/mini-1959-2000/sistema-frenante/freni-posteriori.html
On Somefordmini.co.uk is the integrated space only 3/4"  for Cooper S
https://www.somerfordmini.co.uk/rear-brakes
Can somebody tell me which one the right is? Whit the 3/4" the rear track is whit the indicated.
Thank you!
Roberto

 Posted: Feb 8, 2022 08:52PM
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Sorry about the duplicate info...

If your car is standard I suspect you are not measuring correctly (just like the authorise who rejected my car). Or you need a new tape measure :)

If your track is indeed almost 70mm wider than stock then the wheels will be poking well out beyond the bodywork (depending on whether you have separate wheel arches or not)???

I hope this is not too rude..... but you do realise that track is measured to the centre of the tyre patch ...not the outside???

With standard (S) wheels in either 3.5 or 4.5 width the outer edge of a 145x10 tyre will sit inside the edge of the arch. The outer edge (usually the side wall but not the tread) of some 165x10 tyres on a standard 4.5 inch wheel will stick outside the standard body work. While the track will be different for each wheel size it will not change if you use a differently sized tyre..... even though the 165 tyre may stick outside the bodywork.

Cheers, Ian

 Posted: Feb 8, 2022 12:42AM
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According to my workshop manual (AKD4935 printed 6/67) the track dimensions are as follows:

F (3.5 inch rim) ...1207mm F (4.5 Inch rim)....1233mm

R (3.5 inch rim) ...1176mm F (4.5 Inch rim) ...1202mm

Standard Mini dimensions quoted are F 1205mm R 1164mm.

I have had similar arguments with our registration authorities ...including having to explain how the track is measured ... huge roll eyes :)

Note that the front track changes with ride height....

Cheers, Ian

 Posted: Feb 7, 2022 11:32PM
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GB
Have a look for Michael Moule of Rosslin Racing - he's in Switzerland and will be able to help without a language and time barrier.

 Posted: Feb 7, 2022 09:15AM
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Hi Kim,
thank you very much for your answer!
But i think i 've a problem: the track of my car are front 1270mm & 1240 rear. Whit 3.5" wheel ...
I wonder that a cooper that use spaced drum (1" more every side = 50.8 mm larger) the same track (13mm more) as a Saloon.
Ok, wheel Offset ist 10mm more = 20 mm, but it's a difference of 30 mm..
Tomorrow i'll mesure all once again. & the Cooper MK2 998 of my father too.
Thank yuo again,
Roberto

 Posted: Feb 6, 2022 12:27PM
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Hi! 
Can't seem to be able to attach a pdf.  But I have the BMC Workshop manual from then (copyright 1966).  It list the tracks for a regular Saloon 1205mm Front and 1164mm rear.   For the Cooper S it is 1207mmFront/ 1176mm R with 3.5" rims and 1233mmFront/ 1202mm Rear with 4.5" Rims.  That matches another source for '64-'67 Cooper S - The Complete Mini 35 years of Production History by Chris Rees (copyright 1994)

 Hope that helps. 
Kim 

 Posted: Feb 6, 2022 08:23AM
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Hi Mini Specialist,
I'm a mechanic based in Switzerland and we are taking care of a wonderful Austin Mini Cooper S 1275 MK1 , 1967.
Sorry for my English... we have a problem that we can't solve.
We was on Friday to the official Swiss register to register the car as original Oldtimer car.
The technician say us, that front and rear track don't have the original dimension. We are 35 mm to large.
They tell us 1210 mm front track and 1160 rear track as original dimension.
I've seen in BMW/Mini historical register that this dimension the same is to the Mini of 1959 ( not Cooper, 4 drill brakes) and is indicated for our vehicle to!
But the Cooper S hat spaced drum rear, front 7.5 brake disc...
How can be the same track?
We tried whit original 3.5" wheel Offset 35 and Offset 45, but we are really too far for this dimension.
Can somebody tell me, if the indicated dimension for the Cooper S version is?
Car it's total original, no idea how we can smaller the track like this...

Thank you,
Roberto