You guys notice a performance drop when upgraded to 19s?

TxBeem · 07-06-2010, 11:19 PM

I am planning on going +1 on my wheels to 19. I don't want to lose the agility and speed of my stock 335 too much. Is there a noticeable difference going from 18 to 19's? And can you guys tell me how 19's non RFT's ride compare to 18's RFT?

chromisdesigns · 07-06-2010, 11:30 PM

As long as you got the right profile, overall diameter should be the same, so no performance changes. I don't have 19's, but they CAN'T ride any worse than 18's and Bridgestone runflats, so I wouldn't worry about that!

Wake27 · 07-06-2010, 11:36 PM

Quote:

Originally Posted by chromisdesigns

As long as you got the right profile, overall diameter should be the same, so no performance changes. I don't have 19's, but they CAN'T ride any worse than 18's and Bridgestone runflats, so I wouldn't worry about that!

What about extra weight? I know its only four inches, but IIRC I saw some recent convos on how much 19s weigh and how much of a difference it makes. That may have been upgrading from 17s or even 16s though, not sure.

kfiend · 07-06-2010, 11:39 PM

I run a 08 325i with 19's on. Only the wheel diameter has changed but not the width of the tyres. Power-wise, I couldn't feel any changes with my butt dyno. But, it for sure does ride a lot better than those standard RTFs. Less noise, smoother and less jumping around (bare in mind that, we do have quite shiaty roads here in Hong Kong).

jacky822 · 07-06-2010, 11:55 PM

to be honest.. from my experience...

oem 189's 18" with 235 255 hankook vs forgestar f14 19" 225 265 hankook.. i like oem more... the 19" forgestar f14 while cornering.. feels like the car unstable...

DJKhan85 · 07-07-2010, 12:02 AM

It has been a while since I ran with the stock 18s but I can tell you for a fact that I feel a difference between my winter 17s and summer 19s. I can feel the difference in steering weight(due to change in wheel width) and initial take off. The good part is that I can take much tighter turns due to the wider stickier tires. I'm running stock 230s with Falken 452s.

In all honesty, I highly doubt you'd notice a difference going from stock 18s with rft to 19s with non rft. I remember lifting my stock 18s with rft and it had quite some heft to it. Just don't cheap out on the tires.

IN54NITY · 07-07-2010, 12:05 AM

I = mr^2

Rotational inertia. Even if your 19" rims have the same amount of mass at the rim (most likely they have more, unless they are really, really light), the 19 inchers have approximately 11% more inertia. (19^2 = 361, 18^2 = 324, 361 - 324 = 37, 37/324 = ~ .1142) Now granted your 19" tires may have less mass than the 18" tires, but aluminum weighs more than rubber (and "r" is close here).

To answer your first question, one definitely notices the increase in "I" at the track. Everyday driving not so much. I can't answer your 2nd. Sorry, I still have RFTs on my 19" wheels.

topcat87 · 07-07-2010, 12:06 AM

they ride the same.

you lose out on weight and gearing though

Wake27 · 07-07-2010, 12:10 AM

Quote:

Originally Posted by aleckzandr

I = mr^2

Rotational inertia. Even if your 19" rims have the same amount of mass at the rim (most likely they have more, unless they are really, really light), the 19 inchers have approximately 11% more inertia. (19^2 = 361, 18^2 = 324, 361 - 324 = 37, 37/324 = ~ .1142) Now granted your 19" tires may have less mass than the 18" tires, but aluminum weighs more than rubber (and "r" is close here).

To answer your first question, one definitely notices the increase in "I" at the track. Everyday driving not so much. I can't answer your 2nd. Sorry, I still have RFTs on my 19" wheels.

Dude that whole post was ridiculous.

jacky822 · 07-07-2010, 12:13 AM

Quote:

Originally Posted by aleckzandr

I = mr^2

Rotational inertia. Even if your 19" rims have the same amount of mass at the rim (most likely they have more, unless they are really, really light), the 19 inchers have approximately 11% more inertia. (19^2 = 361, 18^2 = 324, 361 - 324 = 37, 37/324 = ~ .1142) Now granted your 19" tires may have less mass than the 18" tires, but aluminum weighs more than rubber (and "r" is close here).

To answer your first question, one definitely notices the increase in "I" at the track. Everyday driving not so much. I can't answer your 2nd. Sorry, I still have RFTs on my 19" wheels.

Dude that whole post was ridiculous. x2 omg...

IN54NITY · 07-07-2010, 12:20 AM

Quote:

Originally Posted by jacky822

to be honest.. from my experience...

oem 189's 18" with 235 255 hankook vs forgestar f14 19" 225 265 hankook.. i like oem more... the 19" forgestar f14 while cornering.. feels like the car unstable...

With the same Hankook tire? This is interesting, with Bridgestone Potenzas I had the opposite experience with 18" vs 19". 19"s had ever so slightly slower turn in, but once initiated I liked the 19"s. 19"s were ~slow~ due to weight/inertia. What you mention Car & Driver also mentioned in their tire test. They had greatest lateral acceleration on the 18"s, even over the 19"s.

IN54NITY · 07-07-2010, 12:25 AM

Quote:

Originally Posted by Wake27

Dude that whole post was ridiculous.

You should reread your own signature. The OP had a question that physics can answer. I provided that.

Minefield · 07-07-2010, 12:27 AM

I have the 19" Linea Corse 8.5/10 in. There is definitely a noticeable and IMO too much understeer. I can't say whether it is the 19" that contributes to the understeer or the stagger size but I actually prefer my OE 18" 8/8.5 in terms of steering.

jacky822 · 07-07-2010, 12:30 AM

Quote:

Originally Posted by aleckzandr

With the same Hankook tire? This is interesting, with Bridgestone Potenzas I had the opposite experience with 18" vs 19". 19"s had ever so slightly slower turn in, but once initiated I liked the 19"s. 19"s were ~slow~ due to weight/inertia. What you mention Car & Driver also mentioned in their tire test. They had greatest lateral acceleration on the 18"s, even over the 19"s.

probably because of the front tire?? the car is very naughty when cornering
I have:

19x8.5 225 35
19x10 265 30

rex5272 · 07-07-2010, 01:34 AM

Quote:

Originally Posted by aleckzandr

I = mr^2

Rotational inertia. Even if your 19" rims have the same amount of mass at the rim (most likely they have more, unless they are really, really light), the 19 inchers have approximately 11% more inertia. (19^2 = 361, 18^2 = 324, 361 - 324 = 37, 37/324 = ~ .1142) Now granted your 19" tires may have less mass than the 18" tires, but aluminum weighs more than rubber (and "r" is close here).

To answer your first question, one definitely notices the increase in "I" at the track. Everyday driving not so much. I can't answer your 2nd. Sorry, I still have RFTs on my 19" wheels.

Wake27 · 07-07-2010, 01:46 AM

Quote:

Originally Posted by aleckzandr

You should reread your own signature. The OP had a question that physics can answer. I provided that.

Ridiculous in a good way, not bad.

IN54NITY · 07-07-2010, 01:55 AM

Forgot to mention that's a significant inertia and (even just) weight gain for the (4) wheel set that must be overcome! FWIW, even the BMW e92 M3 GTRs "only" ride on 18" wheels.

IN54NITY · 07-07-2010, 01:58 AM

Quote:

Originally Posted by Wake27

Ridiculous in a good way, not bad.

Ahhh, ok.

Kayani_1 · 07-07-2010, 02:28 AM

I actually like 19" as the overall grip seems a bit more due to wider aspect ratio front and rear.

HTran · 07-07-2010, 02:35 AM

Quote:

Originally Posted by aleckzandr

Ahhh, ok.

good post man. I was wondering the same thing as the OP, and you proved it.

Morpheus · 07-07-2010, 05:54 AM

http://www.caranddriver.com/features...sted-tech_dept

E90 87ss · 07-07-2010, 10:30 AM

i have csl reps 19x8.5 and 19x9.5 compared to 16 inch wheels with rft i find the handling a little softer. But that's a good thing... The 19s are .5lbs lighter than the 16s with RFTs.

07-06-2010, 11:19 PM	#1
TxBeem Captain 93 Rep 651 Posts Drives: 2008 E90 Join Date: Jul 2010 Location: Dallas iTrader: (6)	You guys notice a performance drop when upgraded to 19s? I am planning on going +1 on my wheels to 19. I don't want to lose the agility and speed of my stock 335 too much. Is there a noticeable difference going from 18 to 19's? And can you guys tell me how 19's non RFT's ride compare to 18's RFT?
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07-06-2010, 11:30 PM	#2
chromisdesigns Lieutenant Colonel 45 Rep 1,754 Posts Drives: 2008 BMW 335i sedan Join Date: Jan 2010 Location: San Francisco iTrader: (0)	As long as you got the right profile, overall diameter should be the same, so no performance changes. I don't have 19's, but they CAN'T ride any worse than 18's and Bridgestone runflats, so I wouldn't worry about that!
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07-06-2010, 11:39 PM	#4
kfiend Second Lieutenant 6 Rep 285 Posts Drives: E90 325i & F10 550i Join Date: Apr 2010 Location: Hong Kong iTrader: (0)	I run a 08 325i with 19's on. Only the wheel diameter has changed but not the width of the tyres. Power-wise, I couldn't feel any changes with my butt dyno. But, it for sure does ride a lot better than those standard RTFs. Less noise, smoother and less jumping around (bare in mind that, we do have quite shiaty roads here in Hong Kong).
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07-06-2010, 11:55 PM	#5
jacky822 First Lieutenant 48 Rep 393 Posts Drives: E60 M5 Join Date: Dec 2009 Location: Seattle, WA iTrader: (2)	to be honest.. from my experience... oem 189's 18" with 235 255 hankook vs forgestar f14 19" 225 265 hankook.. i like oem more... the 19" forgestar f14 while cornering.. feels like the car unstable...
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07-07-2010, 12:02 AM	#6
DJKhan85 Major 24 Rep 1,190 Posts Drives: 2011 4dr 6mt Golf GTI Join Date: Jun 2009 Location: Boston Massachusetts iTrader: (1)	It has been a while since I ran with the stock 18s but I can tell you for a fact that I feel a difference between my winter 17s and summer 19s. I can feel the difference in steering weight(due to change in wheel width) and initial take off. The good part is that I can take much tighter turns due to the wider stickier tires. I'm running stock 230s with Falken 452s. In all honesty, I highly doubt you'd notice a difference going from stock 18s with rft to 19s with non rft. I remember lifting my stock 18s with rft and it had quite some heft to it. Just don't cheap out on the tires. __________________ 2011 VW GTI 4dr-6mt-Sunroof-Nav-Xenons OLD: 08 335i AW/CR/Poplar 6mt-ZSP-ZPP-ZCW-iPod-iDrive-PDC-Style 230s w/FK 452-Dinan LSD
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07-07-2010, 12:05 AM	#7
IN54NITY Major nutz 86 Rep 1,488 Posts Drives: '09 n54 e92xi, 6mt, kw v3 Join Date: Sep 2009 Location: Colorado, USA iTrader: (0) Garage List 2009 335xi [8.89]	I = mr^2 Rotational inertia. Even if your 19" rims have the same amount of mass at the rim (most likely they have more, unless they are really, really light), the 19 inchers have approximately 11% more inertia. (19^2 = 361, 18^2 = 324, 361 - 324 = 37, 37/324 = ~ .1142) Now granted your 19" tires may have less mass than the 18" tires, but aluminum weighs more than rubber (and "r" is close here). To answer your first question, one definitely notices the increase in "I" at the track. Everyday driving not so much. I can't answer your 2nd. Sorry, I still have RFTs on my 19" wheels. __________________ KWs - Vorshlags - APEX EC-7s - "My garage" has suspension install pictures. _____________________
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07-07-2010, 12:06 AM	#8
topcat87 Banned 35 Rep 356 Posts Drives: F30 Join Date: Sep 2009 Location: Here iTrader: (3)	they ride the same. you lose out on weight and gearing though
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07-07-2010, 12:27 AM	#13
Minefield Colonel 44 Rep 2,730 Posts Drives: Car Join Date: Aug 2008 Location: Location iTrader: (1)	I have the 19" Linea Corse 8.5/10 in. There is definitely a noticeable and IMO too much understeer. I can't say whether it is the 19" that contributes to the understeer or the stagger size but I actually prefer my OE 18" 8/8.5 in terms of steering.
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07-07-2010, 01:55 AM	#17
IN54NITY Major nutz 86 Rep 1,488 Posts Drives: '09 n54 e92xi, 6mt, kw v3 Join Date: Sep 2009 Location: Colorado, USA iTrader: (0) Garage List 2009 335xi [8.89]	Forgot to mention that's a significant inertia and (even just) weight gain for the (4) wheel set that must be overcome! FWIW, even the BMW e92 M3 GTRs "only" ride on 18" wheels. __________________ KWs - Vorshlags - APEX EC-7s - "My garage" has suspension install pictures. _____________________ Last edited by IN54NITY; 08-09-2010 at 07:57 PM.. Reason: Removed math error, I had incorrectly multiplied 11% by 4 to 44%, it is 11% for all four wheels as well
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07-07-2010, 02:28 AM	#19
Kayani_1 Lieutenant Colonel 81 Rep 1,656 Posts Drives: BMW E92/E60 Join Date: Oct 2009 Location: Houston iTrader: (1)	I actually like 19" as the overall grip seems a bit more due to wider aspect ratio front and rear.
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07-07-2010, 05:54 AM	#21
Morpheus Captain 25 Rep 941 Posts Drives: 335i Titanium Silver Join Date: Sep 2008 Location: Cockaigne iTrader: (1)	http://www.caranddriver.com/features...sted-tech_dept
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07-07-2010, 10:30 AM	#22
E90 87ss Captain 37 Rep 608 Posts Drives: ! Join Date: Sep 2009 Location: NJ/Philly iTrader: (1)	i have csl reps 19x8.5 and 19x9.5 compared to 16 inch wheels with rft i find the handling a little softer. But that's a good thing... The 19s are .5lbs lighter than the 16s with RFTs.
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