qube

Mini Cooper Wheel Fitment (Stud Bolt Issue)

17 posts in this topic

Came across an annoying issue recently thought I'd ask if anyone knows more about it.

Basically I got some wheels 4x100 to fit onto my Mini Cooper.

Later I found out that the bolt holes on the mags itself are only M12 and the mini uses M14x1.25 bolts so the bolt doesnt even fit through the hole.

option 1: get a machine shop to drill out 16 holes bigger to fit the m14 bolts (will it be perfectly centered if done so? worrying..)

option 2: bolt to bullet stud and nut conversion? Do they even have bullets that go from m14 down to m12??

What a pain in the a**.. why do they make wheels/cars with different sized bolts? as if having different PCD is not annoying enough as it is...

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Any half decent machine shop should be able to drill the holes out perfectly, you would need to be happy that it won't compromise tbe strength of the wheels doing so.

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have seen this already thanks dave.. but for its over $200.. for a problem that shouldnt exist in the first place..

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2 hours ago, M3AN said:

#2 is the only viable option for the reasons you mention about #1.

Nope, Wrong #1 is the best option because it is meeting the manufacturers specs, that is BMW / Mini determined that 14mm was the required stud size, 

Any decent wheel shop like Arrow  wheels does this on a daily basis  sometimes they install steel inserts only time it wont work is with a large centre bore and small PCD 

Even if ( and they won't be) slightly out it is the HUB centre that is what defines wheel centering not the studs, thats assuming you have matiching hub and centrebore diameters 

Reducing stud size increases load and any failure is outside manufacturers spec and could be considered an unsafe mod 

Its not a common problem  it is a common error - people not doing their homework and buying un suitable wheels. 

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Okay Bill.

 

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I have looked at so many wheels and not once had a problem with bolt hole sizes before..

Since I encountered this problem I have looked high and low but no spec sheet specifies a wheels' bolt hole size anywhere..

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3 minutes ago, qube said:

I have looked at so many wheels and not once had a problem with bolt hole sizes before..

Since I encountered this problem I have looked high and low but no spec sheet specifies a wheels' bolt hole size anywhere..

I also assumed they were all the same and most seem to be 12mm which is obviously enough for most applications. Why BMW/MINI went for 14mm is beyond me. Any normal person could make this grievous error I'm sure. 

I'd still rather spend the $ on the studs than a machine shop.

 

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11 hours ago, M3AN said:

I'd still rather spend the $ on the studs than a machine shop.

 

Dave, there are reasons why wheels are not square and new cars don't come with studs and it's not an anti American conspiracy - put the spade down and stop digging .

Modern well engineered cars have wheel bolts for good reasons  and if you are concerned about saving nanoseconds in wheel changes you simply install a locating dowel. 

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4 hours ago, 3pedals said:

Modern well engineered cars have wheel bolts for good reasons  and if you are concerned about saving nanoseconds in wheel changes you simply install a locating dowel. 

Curious as to what those reason are?

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7 hours ago, 3pedals said:

Modern well engineered cars have wheel bolts

Still yet to come across any Japanese cars with bolts, so not all "Modern well engineered cars" have them. Or are you just showing your ignorant bias and meaning European cars?

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it doesnt matter if its a bolt or a stud does it?.All i know is if i google "mitsubishi pajero wheel specs it tells me it has m12 x 1.5 

If i google toyota landcruiser 200 series it tells me it has M14 x1.5 so the information is readily available but wether that information always goes with the wheel is another matter.

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3 hours ago, KwS said:

Still yet to come across any Japanese cars with bolts, so not all "Modern well engineered cars" have them. 

Kelvin , all we can conclude from that is the Japanese don't engineer their wheel / hub connections as well as the Europeans. Do the mechanical engineering analysis 101 and you should be able to work out why it is a superior system. 

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Please explain it to us.

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No, come on guys, do the mechanical engineering analysis 101, duh!

Anybody making even a casual scientific observation (or having a rational state of mind) would realise that in real-world applications it DOESN'T MAKE A F'ING DIFFERENCE.

Sigh.

 

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What year mini do you have? Likey reason is that the early ones, R56 etc, were a Rover design so probably used different wheel bolt sizes. I suspect the newer Fxx Minis have the same as BMW. 

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2008 R56. 

You may find it interesting to know that some BMW's also use the "odd" m14x1.25 bolts. Such as the new 2 series.

 

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