E30 M3 9Jx16 rims |
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Topic: E30 M3 9Jx16 rims Posted: 27-November-2004 at 15:26 |
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Having finally had some daylight to get to know my new M3 I've discovered the BBS split rims are at the front 8Jx16 on 225/45 tyres and at the rear 9Jx16 on 245/45 tyres. The fronts are correctly sized, but obviously a 45 profile on a 245 section rear tyre is not. When giving it some beans on a back road I could hear the rears rubbing slightly. I'm not sure if this is a function of the too high profile, or the width, or both. Can anyone tell me what the ideal size for 9Jx16 rims is? I suspect 225 will be too narrow for a 9J rim? You can see from this pic the rear profile is too high. |
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Darren M
Really Senior Member II Joined: 31-October-2002 Location: United Kingdom Status: Offline Points: 533 |
Posted: 27-November-2004 at 16:01 | |
I think it is hard to keep the rolling circumference the same when using a 245`s on the rear. A 45 profile is closest and it`s better to go slightly bigger than smaller.
On my old car I fitted 225 *45`s after ditching the 245`s and it looked fine, I was concerned how they would look on a 9inch rim(stretched!) but it didn`t look bad at all. Nice car by the way Edited by Darren M |
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215m3
Really Senior Member II Joined: 10-May-2003 Location: Bathgate Status: Offline Points: 2118 |
Posted: 27-November-2004 at 16:02 | |
Tim
Not sure if you can see from this picture, 9" wheel, the 225 is a little narrow and the edge curves in slightly. |
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Guests
Guest |
Posted: 27-November-2004 at 16:08 | |
Thanks for that Toby. Think I'll go 225/45 both ends in that case, I'd rather having it look a little bit stretched than rub the arches.
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Robbie Bradford
Really Senior Member II Joined: 16-July-2004 Location: Co. Laois, Ireland. Status: Offline Points: 2124 |
Posted: 27-November-2004 at 16:12 | |
I'm a sucker for those rims, by far the best looking wheels for the M3 IMO, nice car BTW, as are all of what i've seen on this forum
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Guests
Guest |
Posted: 27-November-2004 at 16:14 | |
Cheers, yeah they are the t*ts eh! Some more pics of my car here: http://www.timskipper.net/E30M3 |
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m3Cecotto
Bavarian-Board Forum Sponsor Joined: 29-September-2003 Location: Scotland Status: Offline Points: 791 |
Posted: 27-November-2004 at 16:16 | |
225 45 16 gives a rolling diameter of 23.97 inches. Your current fitment of 245 45 16 on the rear gives a rolling diameter of 24.68. Therefore your ride height will be increased by about 9mm and speedo readings etc. will be out by about 3%. 245 is OK on a 9" rim but it is at the the widest acceptable width. 225 is plain wrong on a 9J. Best compromise for rolling diameter and rim width is 260 40 16, a rolling diameter of 24.19inches; ride height increased by 3mm and final drive out by about 1% This is all theoretical. I don't know if you can get 260 under the arches. Hope this helps.
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Mike 90 M3
Really Senior Member I Joined: 08-July-2004 Status: Offline Points: 320 |
Posted: 27-November-2004 at 16:19 | |
(aka Caneswell on evo and s14.net forums) You've found this forum now then tim! Car still looks good. My car has the same size wheels and came with 225 45s allround, which looked fine in my opinion. They are now bald and will be replaced with the same size. I don't think you want to upset the balance by having wider tyres on the back. No one likes understeer! |
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Robbie Bradford
Really Senior Member II Joined: 16-July-2004 Location: Co. Laois, Ireland. Status: Offline Points: 2124 |
Posted: 27-November-2004 at 16:21 | |
Clean as a whistle old chap. I'm also a fan of those smoked headlamps had them on a previous car....nice and aggressive!
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UweM3
Moderator Group Joined: 11-February-2003 Location: United Kingdom Status: Offline Points: 5445 |
Posted: 27-November-2004 at 16:37 | |
225/45 ALL corners with 8J front and 9J rear is PERFECT.
This is how this set of rims was delivered. I had the same combination and still regret it sometimes that I have sold them! Keeping in mind that my rims would have needed a fair amout of money to be sorted. This set of rims is still the best looking rim for the M3 IMHO. I once thought to have the blistering idea of putting 245/45 on the 9J rears, but it was absolutly useless. It was rubbing on the inside and the increased circumference was slowing the car down. But it looks impressive! |
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E61 520d, slow and buzzy but my wallet likes the mpg.....
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m3Cecotto
Bavarian-Board Forum Sponsor Joined: 29-September-2003 Location: Scotland Status: Offline Points: 791 |
Posted: 27-November-2004 at 18:29 | |
I'll bow to your experience Uwe, but my recollection is 225 is not a recommended size for a 9J rim. I'll dig out my ERTA list sometime and check it, it's a while since I did all these calculations regularly but I did check recently that 245 is a prescribed fitment for 8" to 9.5" - therefore I would expect 225 to be approved for 7" - 8.5". ? However if you know that they fit and work, that'll do for me. :-) |
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UweM3
Moderator Group Joined: 11-February-2003 Location: United Kingdom Status: Offline Points: 5445 |
Posted: 28-November-2004 at 06:50 | |
if Schitzer sold them on 8 and 9" rims I believe there can't be much wrong.
I agree that 9" is on the bigger end of the scale for that tyre. But it was road legal in Germany and they are quite strict as everything has to last on full speed Autobahn (which it did ) Edited by UweM3 |
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E61 520d, slow and buzzy but my wallet likes the mpg.....
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rr_ww
Really Senior Member II Joined: 04-May-2003 Location: Location Location Status: Offline Points: 971 |
Posted: 28-November-2004 at 07:55 | |
Uwe
On the thread for the 17" splits you said that 245 would be a preference with regards to the 9J rears? Link (go to 14th post down) Obviously 9J is 228.6mm So why go slightly smaller? Surely +/- 5% larger would be better? On a related note what size wheels/tyres are your BBS Ch's? |
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Rich.
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UweM3
Moderator Group Joined: 11-February-2003 Location: United Kingdom Status: Offline Points: 5445 |
Posted: 28-November-2004 at 09:29 | |
Because of the width/heigth ratio. If 245/40/16 would be available (maybe some brands do)than it's fine. But the 45 ratio of the 16" will require 225 to get the correct circumference. Same for the 17". You have to use the 245/35 because of the circumference. Based on the rim width you have to work your way round to find the correct tyre within the specs.
8.5 x 17 ET15 all corners. 215/40/17 front and 245/35/17 rear. Good for looks but not the best set up for cornering. (Understeer!) |
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E61 520d, slow and buzzy but my wallet likes the mpg.....
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rr_ww
Really Senior Member II Joined: 04-May-2003 Location: Location Location Status: Offline Points: 971 |
Posted: 28-November-2004 at 09:58 | |
Thanks Uwe Should really have known that
How would you like to counter the understeer? |
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Rich.
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texas2201
Really Senior Member I Joined: 27-July-2004 Location: United Kingdom Status: Offline Points: 278 |
Posted: 28-November-2004 at 11:54 | |
HI Tim Car looks very good - seats do not look like anyone has sat in them. how many miles has it done?
Martin
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Martin - www.iconicmotorcars.co.uk
E30 M3 now sold :-(/Lotus Elan SE Turbo/Lotus Excel SE/Lotus Excel SA/Audi A8 - now Tow Barge - Quattro 4.2 |
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Guests
Guest |
Posted: 28-November-2004 at 11:56 | |
148,000 km - pretty good condition for the mileage I'd say!
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UweM3
Moderator Group Joined: 11-February-2003 Location: United Kingdom Status: Offline Points: 5445 |
Posted: 28-November-2004 at 12:42 | |
By ignoring it. You can't really do a lot against it without messing other things up (like tyre wear). For "normal" Road use it doesn't really matter and for track days I have a set of 8x16 anyway. I bought the CH's only for the looks. |
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E61 520d, slow and buzzy but my wallet likes the mpg.....
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UweM3
Moderator Group Joined: 11-February-2003 Location: United Kingdom Status: Offline Points: 5445 |
Posted: 28-November-2004 at 12:44 | |
Tim,
when do you get rid of that green cone thingie? |
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E61 520d, slow and buzzy but my wallet likes the mpg.....
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m3Cecotto
Bavarian-Board Forum Sponsor Joined: 29-September-2003 Location: Scotland Status: Offline Points: 791 |
Posted: 28-November-2004 at 14:27 | |
Probably, but not necessarily. I can confirm from personal experience that one major car manufacturer was selling at least one non-approved wheel and tyre combination on one of its highest selling ranges. These are usually sales driven - nice looking wheel - good deal on the tyres - can they be physically fitted (forced) on to the wheel in testing? Excellent - put them in the options list. Fortunately it was detected at point of fit (where they are fitted in batches normally and problems become apparent fitting 75 not 2) and withdrawn before any got to market, but not without an awful lot of pressure from the vehicle manufacturer to fit them. I have had dealings with seven separate vehicle manufacturers in the area of OE tyre fitment (3 passenger car and 4 commercial vehicle) and all bar one have had "issues" with inapproriate fitments - usually detected at point of fit and always sales driven. I have seen a new tyre being forced on to a new wheel for a new commercial vehicle using the forks of a forklift to break the bead as there was no other way to do it. This fitment (though not the method - they don't care how it is fitted but moan like hell if the rim or tyre is damaged) was specified by the manufacturer and to say they were loathed to delist it is an understatement. The same manufacturer insisted that a previous OE tyre fitting contractor design, develop, commission and pay (£225,000) for a machine specifically to fit a tyre wheel combo that was impossible to inflate. Again this fitment was not approved by tyre and wheel manufacturers and in this case all three fought like fury to retain the fitment even after the ETRA refused to sanction it, and four tyres came off the rims in PDI. I have seen a vehicle manufacturer specify inner tubes for tubeless tyres to overcome problems caused by incorrect fitments. Get the vehicle signed out to hell with the consequences is often the mantra. I still think 225 is to narrow for a 9J rim. :-) My 2ps worth over.
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