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PostPosted: Thu Feb 23, 2012 10:19 am 
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Mokesta wrote:
I have done some measurements. For the rears these number definately work. For the fronts, not confirmed yet.

If you want 10x5 wheels to fit without flares on stepped drums then they should have an offset (ET) of 37mm like the LS Contessas. These give just enough clearance to the trailing arm when using A032R 165/70/10 tyres. I measured Falken FK07E 165/70/10 tyres as being 6mm wider over the sidewalls so they would tighten the gap to the trailing arms. Even this small amount may mean they rub. Any larger offset than 37mm will lead to rubbing on the trailing arms. You could probably go a few mm less offset, say to 34mm.

If you want to run Mk2 S flares (or innocenti/rover plastic ones), which on the rear give 21mm more width at the top than the standard wheel arch trim, and you want the 10x5 wheels to fill the arches then you need an offset of 16mm. Coincidently, the 'SS' or 'standard' Contessas have an ET of 17mm.

If you want to run Mk2 S flares and the widest rims possible with the tyres not sticking out more than those above, while using stepped drums, then the size should be 5.5x10 with an ET of between 23mm to 31mm.

If you want to run Mk2 S flares and the widest rims possible with the tyres sticking out just 5.5mm more than those above, while using stepped drums, then the size should be 6x10 with an ET of 24mm.

It is very disappointing that Midland and other suppliers of wheels for minis can't/don't/won't publish offsets. Any reasonable supplier for any other type of car sure does. I suggest asking them to give you the ET/offset for any wheel you are considering and check against the above.

Have you noticed how many people are buying the 10x6 Mambas then having to get bigger flares? I suspect their offset is more like 16mm when it should be 24 for the nest fit.

M


awesome - so if I was to pick up a wheel at a swap meet, and had a ruler in my hand, how would I measure it's offset against those figures?


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PostPosted: Thu Feb 23, 2012 10:46 am 
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You really need two rulers. One needs to be about 280mm maximum overall to measure wheels that have tyres on them. That one can just be a straight edge, no need for graduations. The other needs to have readins starting at the end, not a few mm in from the end like old wooden school rulers.

1/ Inside the wheel. Lay the straight edge across the edge of the rim. Use the ruler to measure the distance from the mounting surface to the straight edge. In the case of an LS Contessa this reads 112mm

2/ Outside the wheel. Lay the straight edge across the edge of the rim and use the ruler through the centre hole to measure the distance out to the straight edge from the mounting surface. This can be tricky due to the chamfer on the centre hole so another short straight edge can be used (like a pencil). In the case of LS offset contessas this dimension reads 37mm

3/ Do this calculation:

Inside measurement - (inside measurement + outside measurement)/2 = Offset

eg: 112-(112+37)/2=offset
112-(149)/2=offset
112-74.5=offset
37.5=offset

Other factoids:
The rim may not say its size (width in inches). If it has a tyre fitted it is hard to measure the inside of the bead surfaces that set the width. Typical alloys are about 11mm wider per side (22mm overall) than their tyre mounting size.

So add Inside Measurement to Outside Measurement, subtract 22mm and convert to Inches.

eg: (inside measurement + outside measurement - 22)/25.4=size
(112 + 37 - 22)/25.4 = size
127/25.4=size
5=size

Happy shopping!


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PostPosted: Thu Feb 23, 2012 9:04 pm 
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simon k wrote:
1071 S wrote:
" If you want real Minilites you need the 4.5X10 "FIA" offset version to fit over S brakes without flairs.."


I went looking on the minilite website and couldn't find references to the FIA spec, got a link?


i bought mine about 8 years ago but the Minilite web site no longer mentions the FIA spec. They do provide different part numbers for 4.5" wheels for the S and Mini/Cooper. For S discs/stepped drums I would suggest you need the S spec - but I would ask them.

Cheers, Ian


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PostPosted: Fri Feb 24, 2012 1:06 am 
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Moriarty wrote:
This gets confusing! I'm curious as to whether I could run Minilites (not Minilights / Minilifes / etc) over my standard Cooper S 7.5" discs + stepped rear drums without flares or other modifications, and how much it would affect the car's handling and braking performance relative to the same tyres fitted to 5x10 wheels. Anyone know what the "correct" offset is (i.e. which ET figure you would quote / request) ?

Would there be any problems fitting the popular 165/70/10 tyres like Dunlop D93J, Yokohama A032R or Yokohama A008?

I run 10 x 6 minilites on my standard set up GT, but they do protrude out from the flares about 1". No mods required to the calipers required. 10 x 5 would be a perfect fit! with no flares, I guess you would need the 10x4.5.

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PostPosted: Fri Feb 24, 2012 3:18 am 
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I just ordered 5.5"x15" Minilites for my MGB. No problem at all discussing backsets with them by email. The 15"s will come with the appropriate backset for 195x60 tyres. Russ is very approachable by email!

I bought seven (7) 5"x10" Minilites for my Mini & trailer because I was using City Flairs. With S brakes and no flairs I would have bought the 4.5"x10" Minilites (for "S" aplication).

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PostPosted: Thu Mar 01, 2012 8:33 am 
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I sent the Minilite company an email asking about the difference between the standard and S wheels they sell in the 5x10 size, this is the reply:

Tech-Del Ltd wrote:
We supply two different offsets on both the 4.5x10 and 5.0x10 Minilite wheels the D being for the standard drum braked Minis and the DS for the Cooper S or Minis that have been converted to disc brakes on the front and Minifin drums on the rear with the inbuilt 10.0mm spacer.

The 4.5x10 wheels will fit inside the bodyline without flares but the 5.0x10 requires the fitting of the small flares.

So, as suspected, the S fitting has a different offset, but this is only to adapt it to the front caliper and rear stepped drum which stick out further than plain ol' drums front and rear (I'm heaps technical :wink:)- they still protrude the same distance from the car body. The diagram at http://minilite.co.uk/technical.htm should help if that doesn't make sense.

Thanks everyone for your technical contributions :D

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PostPosted: Thu Mar 01, 2012 10:02 am 
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So why can't they just quote the offsets in their reply instead of just saying they are different to suit different brakes? Frustrating.


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PostPosted: Thu Mar 01, 2012 1:18 pm 
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Yeah, I did specifically ask for the offset numbers, how far they sit outside the body of the car and any fitting issues, but I'll take what I'm given :wink:

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PostPosted: Thu Mar 01, 2012 1:53 pm 
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Mokesta wrote:
So why can't they just quote the offsets in their reply instead of just saying they are different to suit different brakes? Frustrating.

That midland wheels site does list offset. One of the better parts sites I've seen really.


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PostPosted: Thu Mar 01, 2012 3:20 pm 
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I've checked the 5x10 wheels on the MWS site, it doesn't actually list the offset figure. It just says "offset: ET", which is the same as saying "offset: offset" (ET is an abbreviation of the German word for offset, Einpresstiefe. It should read ET +/- XX millimetres eg ET +50 or ET -10

I did find an outdated webshop that listed the "Minilite 4.5X10 Cooper S FIA wheel", so that joins those dots.

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Last edited by Moriarty on Fri Mar 02, 2012 9:19 am, edited 1 time in total.

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PostPosted: Fri Mar 02, 2012 8:09 am 
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Hey guys,

I'm considering a couple different wheels but just trying to understand how they will fit my mini (998 ini 850 shell with std drum brakes), i've sent a couple emails to suppliers so while i wait i thought i see your opinions (and just noticed this thread):

The ones i like are the starmag 6x10, but thinking they will be too wide, the offset on a couple sites say they are +7.

And the other ones are the mambas 5x10 (offset s appears to be 0)

Cheers,
Mark


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PostPosted: Fri Mar 02, 2012 1:24 pm 
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Kuross (Mark),

For non-spacered drums your 6x10s will probably have the tyres hitting the trailing arm (if the offset of 7mm is in the direction I think) a 5mm smacer would be the minimum you'd need but then the wheels would stick out more than even Mk2 Cooper S or standard black plastic flares would cover. If the offset is the other way around to what I think then they'll stick out even more. Scratch those ones.


5x10 with zero offset will sit out 17mm and need flares.

Std Contessas (10x5 ET17) or 4.5 inch Jelly Beans (10x4.5 ET12) are the best fit with no flares on a drum front and no-spacer drum set-up.

*Disclaimer - I'm on pain killers after surgery and my brain has stepped out for lunch so all of this could be BS.


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PostPosted: Fri Mar 02, 2012 1:51 pm 
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Standard (non-LS) 10 x 5 Contessas on standard drums fill out the guards of an 850, Deluxe or K nicely without needing flares.

Cheers,

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PostPosted: Fri Mar 02, 2012 1:53 pm 
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bnicho wrote:
Standard (non-LS) 10 x 5 Contessas on standard drums fill out the guards of an 850, Deluxe or K nicely without needing flares.

Cheers,


but you've gotta watch out with fatter 165's that they don't rub on the radius arms at the back


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PostPosted: Fri Mar 02, 2012 2:34 pm 
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Thanks guys,

I have some flares to put on so sticking out a little is fine, i might have to measure up over the weekend.

Cheers


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