19" Wheels

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Sep 26, 2004 | 10:31 PM

AverageJoe

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From: Portland, OR USA

Hi,

I want to get some feedback on wheel and tire changes to the "stock" 545 Sport Package. I currently have on the front (245/40/18) and on the rear (275/35/18).

I want to use a 19" wheel/tire from the current 18" but still keeping the 40 series front tire and 35 series rear tire. Roads here in OR aren't that smooth. My question is if I go with a 245/40/19 front and a 275/35/19 rear, my questions are:

* How much off will the Speedometer be
* Will there be any tire rubbing
* Do I need to upgrade the brakes
* How does this affect the DSC and DTC systems
* What changes to the current handling will I notice

Thanks.

Sep 27, 2004 | 07:06 AM

Lomag

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Your speedo will be too slow, meaning if it says your going 50 mph your acctually going like 53 mph. About 4% slower. Rubbing could be a problem since your not downsizing the tire itself but I'm no expert in that. I'd seriously stick with the recommended tire sizes when going up or down rim sizes.

See URL:
http://www.miata.net/garage/tirecalc.html

Sep 27, 2004 | 10:51 AM

Don Juan

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From: South Florida -

Plus it may affect the handling because thecar will ride higher. I have 19s and have hit a couple of potholes here in florida. Still no shaking . If you llok there is still plenty of rubber there.. go with BMWs approved sizes..can not go wrons

Sep 27, 2004 | 02:26 PM

Guest

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i had 19" hartge classics on my 8 series til recently!

Sep 27, 2004 | 07:49 PM

wolverine

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From: Cincinnati, Ohio

Quote:

Originally Posted by AverageJoe' date='Sep 27 2004, 12:31 AM

Hi,

I want to get some feedback on wheel and tire changes to the "stock" 545 Sport Package.? I currently have on the front (245/40/18) and on the rear (275/35/18).?

I want to use a 19" wheel/tire from the current 18" but still keeping the 40 series front tire and 35 series rear tire.? Roads here in OR aren't that smooth.? My question is if I go with a 245/40/19 front and a 275/35/19 rear, my questions are:

* How much off will the Speedometer be
* Will there be any tire rubbing
* Do I need to upgrade the brakes
* How does this affect the DSC and DTC systems
* What changes to the current handling will I notice

Thanks.

[snapback]38441[/snapback]

Sorry to put it this way, but you are absolutely out of your mind if you go with that tire and wheel combination. Maybe with a beater car you drive when you're in high school, but not with a BMW!! If you don't believe me, please talk to an expert. You will change the handling, ride, speedometer, gearing, braking, suspension settings, accelleration, cornering, center of gravity, and god knows what else.

The good news is if you go with 19" wheels, and substitute good quality non-runflats, your ride will actually improve over the 18" wheels with runflats.

Sep 28, 2004 | 07:51 AM

AverageJoe

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From: Portland, OR USA

Thanks for all the response. I was thinking of filling the wheel wells with bigger/taller tires as opposed to having to lower the car. From the responses, it seems like increasing the wheel diameter may not be the right way to go.

Sep 28, 2004 | 07:56 AM

530E60NL

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My Ride: [i][b][u]Since 19 august 2004[/u][/b][/i]: [color=red][b]530i[/b] High Executive[/color], Silvergray with beige interior, Popular wood, Servotronic, Sportssuspension, electric foldable and dimmed mirrors, dimmed interior mirror, pappelmaser braun wood, cupholders, styling 123 18" wheels, Logic 7, Steptronic, alarm class 3, electric sunscreen in the rear and suncreens for sidewindows, Comfort seats, heated seats, Xenon with headlightwashers, Adaptive corner lights ALC, Advanced airconditioning, lightpackage, Nav Pro, 6 cd changer, side airbags rearseats, bluetooth siemens S55, chrome kidneys, gearlever with wood, voice recognition retrofit, front windshield with green band. Waiting for trunkopener button from Hobi :)

I think so too.. Just keep it the way BMW designed it, I think you'll be much more satisfied.