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08-07-2007, 04:17 PM | #1 |
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Disadvantages of 19's...
I'm worried that going with the 19's will make the ride too harsh for these horrible NH roads I have to drive on. Can anyone tell me if there is a huge difference in ride quality between 18's and 19's?
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08-07-2007, 05:34 PM | #2 |
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a little bumpier..but youll regret not getting them every time you see another m3 with them. i bought mine after i purchased the car and lost tons of dollars!
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08-07-2007, 10:39 PM | #3 |
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I have 20's on my ML350 and they're fine. 19s look better than 18s and there is little difference in ride quality. Put snows on your 18s and you're set.
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08-08-2007, 12:05 AM | #4 |
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Performance in general
In general 18s for performance and 19s for looks.
That being said the amount of performance decline you will experience with 19s compared 18s will be small but measureable. The basic reason is weight and moment of intertia. Rotating mass in a vehicle is more of a performance hinderance than non rotating mass because it takes more energy to get a rotating mass translating and rotating than to simply get a non-rotating mass translating. This obsession with rotating mass can be seen in all sort of design areas and many in cars. Engine designers are quite keen to lower rotating bodies mass and moment as well. Next thing about an objects moment of inertia is that it rises very quickly with its size - as the square of it's radius in fact (meaning double the radius = 4 times larger moment). These priciples explain the extra work brakes have to do in decelerating a vehicle as well as the hinderance larger wheels play in its acceleration. The next area the heavier wheels (and tires) hurt you is in suspension performance. Anything that moves with the wheels is part of the vehicles so called "unspring weight". High unsprung weight is a huge detriment to vehicle suspension performance because all of that mass has a high inertia and can not respond as quickly nor as effectively to roadway force and profile inputs as a low mass/low inertia system. OK, enough technical blah, blah, blah. Some pratical information: Wheel weight varies significantly by manufacturer and design. It is quite possible for a nice, weight consciously designed, forged 19" to be significantly lighter than a crappy 18". However again, apples to apples, with a similar design the 18 will be lighter and a lower moment of inertia. Also to back up this claim I specifically remember an article that tested 18s vs. 19s on the M3 and they did measure better acceleration, braking and ride with the 18s. Last but not least I personally can not stand how much the 18s pale in comparison in the looks department to the 19s, so I will comprimise. I'll go for 19s but will consider weight in my criteria. However, if I can't find a design I really like to look at I will also just eat the performance differences. Hope that all helps. |
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08-08-2007, 05:31 PM | #5 | |
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10-02-2007, 12:11 AM | #7 |
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No the ride and the hadnling only improves wiht 19" rims. I have a bmw 328xi coupe. After i put the rims on it i was scared that the ride would be harsh but it wasnt. My friend who has the smae car as me put 20' rims on his car and he is looking to sell them know deep dish crome. Becuase he went to big and he feels liek he is in a suzuki his ride sucks... So dont hesitate wiht the 19' rims
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11-05-2007, 08:15 AM | #9 |
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11-05-2007, 11:57 AM | #11 | |
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Since we all know RS is the performance version of standard Audi cars. And the CSL is the performance driven version of a standard M3. Why would BMW put 19" wheels on an M3 CSL if 18" wheels would perform better?
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11-05-2007, 09:53 PM | #12 |
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cast or forged?
Does anyone know if the 19' and 18' wheels are cast or forged? Mine is 18' and a mechanic at a shop here says both weigh similar. He has already dealt with a few 92M3. Thanks.
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11-06-2007, 08:30 AM | #13 | |
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Wheels
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light alloy wheels. The tyres are also specifically selected for the M3. The Michelin Pilot Sport (PS2*) is currently fitted." BMW Aftersales Training Information So, yes, it is likely they weigh about the same, with the forged probably being stronger.
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11-06-2007, 11:35 AM | #14 | |
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Good question
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11-06-2007, 04:22 PM | #15 | |
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11-06-2007, 05:09 PM | #16 | |
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So what I am trying to say is you can only truly optimise a car for one wheel size, so this explains why the CSL was able to run 19" wheels and perform amazingly and yet in the M3 it always felt like a compromise. |
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11-06-2007, 06:04 PM | #17 | |
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Let's say the following statements are true. (18" wheels perform better than 19" wheels, and the CSL is the performance brand for BMW's M division. CSL owners are more interested in performance than standard M3 owners.) If it were merely a matter of sacrificing aesthetics for performance, why not give the option for both? I submit that there is always the exception in every case and I'm hardly an expert, but this one seems to fall right in that category.
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11-06-2007, 08:36 PM | #18 | |
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18s vs. 19s
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11-07-2007, 07:39 AM | #19 | |
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11-07-2007, 08:41 AM | #20 | |
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BTW: nice write-up swamp. |
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11-07-2007, 09:08 AM | #21 |
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Stock wheel weight
I'd like to see confirmation of that. The 18s on the E46 M3 are 24 lb. front 26 lb. rear, if I remember correctly (or is it 26 & 28?).
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Greg Lake Oswego, Oregon, USA 2023 M2 Coupe - Brooklyn Grey/Cognac/CF, 6MT; 2020 MB GLE 450 Last edited by GregW / Oregon; 11-07-2007 at 09:29 AM.. |
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11-07-2007, 11:23 AM | #22 |
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I will never buy cast wheels, ever. New Orleans' shitty roads *demand* forged wheels. My E46 19" wheels have taken some serious abuse....
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