Changing rim sizes

sccpa · 08-05-2022, 09:38 AM

I have a 740i M package that has 20" rims. I want to go to a 19" M rim. Does anyone know of any issues or changes that would have to be made? May be a stupid question, but thought someone may know.

kasrar · 08-05-2022, 12:01 PM

As long as the wheel specs fit, everything should be fine. You can also adjust the ride height accordingly if you wish to, through ISTA. It should be fine to drive without adjusting it as well.

Not a stupid question, everyone learns somehow!

Atavus · 08-05-2022, 12:45 PM

Ride height doesn’t change with the wheels.

kasrar · 08-05-2022, 11:28 PM

Quote:

Originally Posted by Atavus

Ride height doesn’t change with the wheels.

If you open ISTA actually, there is an option to "adjust ride height" in order to set it to OEM specification, it does ask what the diameter of the wheel is. On the majority of other cars, you're right that it shouldn't have to change and it still doesn't have to on the 7, but I'm just saying that if he wanted to go the extra mile that he could set it to factory BMW specifications depending on the wheel diameter.

Atavus · 08-06-2022, 01:32 AM

You’ll be aware that in that software the measurement is from the edge of the lower rim, not the ground. That’s the reason the wheel diameter matters. Not because the ride height needs to differ.

kasrar · 08-06-2022, 02:21 AM

Quote:

Originally Posted by Atavus

You’ll be aware that in that software the measurement is from the edge of the lower rim, not the ground. That’s the reason the wheel diameter matters. Not because the ride height needs to differ.

Ah, I believe we're actually thinking of the same thing. I don't mean that the car would need to be lowered or raised, but just that if he wanted to re-calibrate it. I personally do so every now and then when I feel that maybe it's not properly self-levelling. But yes, I am aware that it is measured from the lowest part of the wheel's rim.

Anyways, I'm sure this all answered his question. To keep it simple, there's nothing you need to change.

Qsilver7 · 08-11-2022, 09:37 AM

Nothing if you stay with the BMW wheel/tire specs for each size you spoke of. The 19" & 20" tire info is in your owners manual (or it used to be) ...or on your driver's door jamb.

Roboschjr · 09-06-2022, 02:43 PM

I have changed rim sizes a few times with no issues. More importantly, I still have my stock 19" M-Sport Rims if you are in the market?

08-05-2022, 09:38 AM	#1
sccpa Registered 1 Rep 3 Posts Drives: 2011 BMW 528i Join Date: Jul 2011 Location: south carolina iTrader: (0) Garage List 2019 BMW 740i [0.00]	Changing rim sizes I have a 740i M package that has 20" rims. I want to go to a 19" M rim. Does anyone know of any issues or changes that would have to be made? May be a stupid question, but thought someone may know.
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08-05-2022, 12:01 PM	#2
kasrar Enlisted Member 7 Rep 33 Posts Drives: 2016 BMW 750i M-Sport Join Date: Apr 2021 Location: Toronto, Ontario iTrader: (0)	As long as the wheel specs fit, everything should be fine. You can also adjust the ride height accordingly if you wish to, through ISTA. It should be fine to drive without adjusting it as well. Not a stupid question, everyone learns somehow!
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08-05-2022, 12:45 PM	#3
Atavus Private First Class 75 Rep 133 Posts Drives: BMW M760Li Join Date: Jul 2021 Location: Slough iTrader: (0)	Ride height doesn’t change with the wheels.
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08-06-2022, 01:32 AM	#5
Atavus Private First Class 75 Rep 133 Posts Drives: BMW M760Li Join Date: Jul 2021 Location: Slough iTrader: (0)	You’ll be aware that in that software the measurement is from the edge of the lower rim, not the ground. That’s the reason the wheel diameter matters. Not because the ride height needs to differ.
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08-11-2022, 09:37 AM	#7
Qsilver7 Major General 4412 Rep 7,449 Posts Drives: F06 650ix GC / F15 X5 50i Join Date: Oct 2016 Location: Indiana, USA iTrader: (0)	Nothing if you stay with the BMW wheel/tire specs for each size you spoke of. The 19" & 20" tire info is in your owners manual (or it used to be) ...or on your driver's door jamb. __________________ 2015 F06 650ix Gran Coupe`(Moonstone/Cohiba Brown)\| 2014 F15 X5 50i MSport (Space Gray/Mocha) Become a BMW CCA member! Click HERE to join and feel free to use my BMW CCA member #191509 as a referral.
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09-06-2022, 02:43 PM	#8
Roboschjr Registered 0 Rep 1 Posts Drives: 2016 BMW 740i M-Sport Join Date: Sep 2022 Location: Naples, FL iTrader: (0)	I have changed rim sizes a few times with no issues. More importantly, I still have my stock 19" M-Sport Rims if you are in the market?
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