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01-12-2010, 05:19 PM | #1 |
craig2859 Black .... all the way !! 58Rep 601Posts Drives: [Previous]2006 330d M-Sport Join Date: Aug 2009 Location: UK-Dorset iTrader: (4) Garage List2006 E90 330d M-Sport [0.00] | Wheels & sizes - confused... Help I am "confused" .... lol Have been watching and looking at all the "wheel" threads over the last few months, and it seems such a minefield, ie spacers, clearance etc, etc. I am clueless with what wheels I need myself, and do not want to steal anyone's thread, so am asking for some "clear" advice here. In the next few months I will be looking at getting some new wheels - style not 100% on yet, and thats not the point of this post. However what I would like to know is what wheels do I need to look for size wise - so I need 2 sets of figures really: 20" Wheels - what is the complete size I will need, and also what tyres should I be looking for to match, also will I need any spacers, etc, etc? 19" Wheels - what is the complete size I will need, and also what tyres should I be looking for to match, also will I need any spacers, etc, etc? Like I say if someone can let me know in laymans terms exactly what size to look for and what additional bits I may need - with tyre sizes for both sizes that would be great - I can then start looking My Car is a 06 330d M Sport - 4 door saloon, no suspension mods or anything. Thank you |
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01-12-2010, 10:31 PM | #2 |
E92Fan Moderator 334Rep 5,493Posts Drives: . Join Date: Aug 2007 Location: . iTrader: (0) | So many wheel threads recently Right, here goes... There are three essential things when it comes to deciding what wheels to get - 1) Size in diameter (eg 17", 18", 19") 2) Size in width (8J, 9J, 10J etc... ps.. 8J = 8" wide) 3) Offset For an E9x, the bolt pattern or PCD must be 5x120 - this never changes regardless of the alloy wheel you put on. Point 1 The most important goal, ignoring the style of the wheel, is that the wheel fits underneath the arches without complication. The actual diameter of the wheel is not actually that important - there are other aspects that should be given greater consideration to. In theory, assuming other parameters of the wheel stay constant (ie. width and offset) you should be able to get even a 21" wheel to fit underneath the arches on a 3 series. The reason is that the entire diameter of wheel and tyre together can be maintained at a roughly constant figure by altering the sidewall profile of the tyre. In other words, if you have a 19" wheel with x mm of tyre sidewall, and want to increase to a 20" diameter wheel, you can reduce the sidewall dimensions of the tyre so that the overall size doesn't change. The downside is obviously less compliance in the tyre, amongst other things. The diameter of the wheel is actually the least important aspect when it comes to choosing a wheel that will fit. Points 2 and 3 above are connected and should be considered together. The overall width of the OEM rear 19" wheel on a BMW 3 series is 9J, or 9 inches. The wheel itself sits in the space between the spring/damper and the inner rear wheel arch. There is a finite amount of space between the two items, within which the rear wheel must be able to turn freely under full load and compression. If you start increasing the size of the rear wheel in terms of its width, ie. go from a 9J to a 10J (or 10 inch) wheel, then you will use more of the available room between the strut/damper and the inner wheel arch. If you go to a 12J wheel, there probably isn't enough physical space. That's the first, basic aspect of wheel size to consider. Now look at this offset diagram below You can see that the offset effects the position of the mounting point of the wheel onto the hub. If the offset is ZERO, the mounting point to the hub is in the centre line of the wheel, and therefore the inner and outer wheel faces are equidistant either side of the hub surface. A wheel with a positive offset (ET > 0) will move the mounting point to the right of the centre line, therefore moving the entire wheel inwards towards the strut/damper. Let's take this example -
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01-13-2010, 04:10 AM | #3 | |
doughboy Major General 1578Rep 8,971Posts Drives: 2018 M2 Comp 6MT Join Date: Jan 2009 Location: UK iTrader: (2) | Quote:
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01-13-2010, 07:02 AM | #4 | ||||
E92Fan Moderator 334Rep 5,493Posts Drives: . Join Date: Aug 2007 Location: . iTrader: (0) | Quote:
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01-13-2010, 07:20 AM | #5 |
craig2859 Black .... all the way !! 58Rep 601Posts Drives: [Previous]2006 330d M-Sport Join Date: Aug 2009 Location: UK-Dorset iTrader: (4) Garage List2006 E90 330d M-Sport [0.00] | Thanks Tony, very informative indeed, your post would be a good sticky actually? So the biggest and widest I can practically go (not saying I will of course), without any work, ie Buy and fit would be this example you posted: Example 3 Front - 8.5J x 20" = 235/30/20 tyre with Rear - 10.5J x 20" = 275/25/20 tyre and if I where too stick with 19" Example 1 Front - 8J x 19" or 8.5J x 19" = 235/35/19 tyre with Rear - 9J x 19" or 9.5J x 19" = 265/30/19 tyre Both of these set ups would be a case of simply buying them and fitting them as normal (not to bothered about discussing ride quality etc - at this point, I will ask that question when I know what to go for) ? . |
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01-13-2010, 08:20 AM | #6 | |
E92Fan Moderator 334Rep 5,493Posts Drives: . Join Date: Aug 2007 Location: . iTrader: (0) | Quote:
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01-13-2010, 08:38 AM | #7 |
dxb335d The Tarmac Terrorist 1011Rep 29,344Posts Drives: 997.2 GT3 Join Date: Mar 2007 Location: ''Fandango Towers'' iTrader: (3) Garage List2010 Porsche 997.2 GT3 [9.50]2003 BMW E46 M3 [6.00]2007 BMW E92 335D [5.50] | 275 tyre will fit a 9j rim. Close to rubbing though. 265 is fine. __________________ 997.2 GT3 |
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01-13-2010, 10:05 AM | #8 |
craig2859 Black .... all the way !! 58Rep 601Posts Drives: [Previous]2006 330d M-Sport Join Date: Aug 2009 Location: UK-Dorset iTrader: (4) Garage List2006 E90 330d M-Sport [0.00] | cheers for all the info everyone, at least I know what to be looking for now. My plan is once I get some new wheels and tyres to replace my current OEM 19s I will change them to a winter set of tyres for next year (leaving my new ones for summer use), any suggestions on decent "winter" tyres, while its fresh in peoples minds with this current weather ? |
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01-13-2010, 10:19 AM | #9 |
doughboy Major General 1578Rep 8,971Posts Drives: 2018 M2 Comp 6MT Join Date: Jan 2009 Location: UK iTrader: (2) | These be your fellas: http://tyremen.myshopify.com/collect.../19inch-winter |
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02-19-2010, 04:14 PM | #10 |
BeemerNI New Member 4Rep 11Posts Drives: 335iSE Join Date: Oct 2009 Location: N Ireland iTrader: (0) | some great advice here! Sorry for asking a stupid question, but why do BMW put 255wide on their 9J rears - that is whats on my current rear wheels - if 265 fits good as well. I imagine it would give better edge protection to the alloys too?? I only ask cause I was looking to change to a 230 style wheel and would consider the wider rear if you guys thought it was better (ie for grip/tyre choice etc). Also, would going from 255/30 to 265/30 be a problem as it would slightly increase the over rolling circumference of the wheel? Cheers all. |
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02-19-2010, 05:04 PM | #11 | |
YvesD Lamininist 89Rep 1,030Posts Drives: Carbon Black X5M Join Date: Apr 2008 Location: United Kingdom iTrader: (3) | Quote:
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02-19-2010, 05:42 PM | #12 |
BeemerNI New Member 4Rep 11Posts Drives: 335iSE Join Date: Oct 2009 Location: N Ireland iTrader: (0) | On the fronts I have 225/35/19 and on the rear it is 255/"30"/19 not 35. Otherwise I take your point - the wider tyre isnt affected by going from a 35 to 30 profile as the overall circum is the same, but i'm already there on a 30 rear tyre...... |
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02-19-2010, 05:51 PM | #13 |
marcel b Lieutenant Colonel 137Rep 1,898Posts Drives: F31 340i Join Date: Jun 2009 Location: Europe iTrader: (0) | 265/30 is no problem, slightly larger diameter but should be no problem. gets more tricky when you are lowered. |
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02-20-2010, 12:12 PM | #14 |
- Paul - Major General 755Rep 7,308Posts Drives: see above. Join Date: Apr 2005 Location: Yorkshire, UK iTrader: (5) Garage List2005 320D SE [10.00]2005 645 [9.00] | My BBS rims that I'm selling were listed as 8.5 but I have just measured them and they are 9" - is this normal? Is there a special way of measuring the rim width? __________________ My Photos |
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02-21-2010, 08:24 AM | #15 | |
doughboy Major General 1578Rep 8,971Posts Drives: 2018 M2 Comp 6MT Join Date: Jan 2009 Location: UK iTrader: (2) | Quote:
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02-21-2010, 08:53 AM | #16 | |
- Paul - Major General 755Rep 7,308Posts Drives: see above. Join Date: Apr 2005 Location: Yorkshire, UK iTrader: (5) Garage List2005 320D SE [10.00]2005 645 [9.00] | Quote:
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04-12-2016, 06:37 PM | #17 |
blau808 Second Lieutenant 118Rep 273Posts Drives: E90, F31, X5 Join Date: Dec 2012 Location: PNW iTrader: (0) | This is the best post for wheel and tire size explanation evah! |
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