Ride with 17's and 18's

m88str · 04-09-2011, 06:43 PM

Hi All,

Spoke to someone that has the 17" M sport wheels on now got the 18" MV3's . . he says that the ride with 17's seemed alot more harder and bumpier then 18's

Has anyone else found this ?

I would have thought a 17 with a 45 profile tyre would have been better then an 18 with a 40 profile tyre.

John_01 · 04-09-2011, 08:03 PM

Were the 17s using runflat tires?

ceb · 04-09-2011, 08:15 PM

Quote:

Originally Posted by m88str

Hi All,

Spoke to someone that has the 17" M sport wheels on now got the 18" MV3's . . he says that the ride with 17's seemed alot more harder and bumpier then 18's

Has anyone else found this ?

I would have thought a 17 with a 45 profile tyre would have been better then an 18 with a 40 profile tyre.

If both cars have the same tire then the 17" will have a softer ride.

HighlandPete · 04-10-2011, 05:20 PM

If we are talking run-flats, stange as it may seem, some models on 18" wheels are a smoother ride than on 17", or even 16" wheels. It is the type of ride, a 17" can be more of a jiggle and feel bouncy. Some of this is down to the sidewall spring rate, it is reported that some 18" RFT's have a lower spring rate than the 17" RFT. Another aspect to consider is the suspension harmonics, some sizes work better on a given suspension set up. So the dynamics do not always conform to what we expect.

HighlandPete

04-09-2011, 06:43 PM	#1
m88str New Member 0 Rep 6 Posts Drives: e90 Join Date: Mar 2011 Location: England iTrader: (0)	Ride with 17's and 18's Hi All, Spoke to someone that has the 17" M sport wheels on now got the 18" MV3's . . he says that the ride with 17's seemed alot more harder and bumpier then 18's Has anyone else found this ? I would have thought a 17 with a 45 profile tyre would have been better then an 18 with a 40 profile tyre.
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04-09-2011, 08:03 PM	#2
John_01 Colonel 232 Rep 2,643 Posts Drives: E90 325i, E82 135i Join Date: Mar 2009 Location: Sydney, Australia iTrader: (0)	Were the 17s using runflat tires?
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04-10-2011, 05:20 PM	#4
HighlandPete Lieutenant General 6659 Rep 15,858 Posts Drives: BMW F11 535i Touring Join Date: Mar 2007 Location: Scotland, Highland Region iTrader: (0)	If we are talking run-flats, stange as it may seem, some models on 18" wheels are a smoother ride than on 17", or even 16" wheels. It is the type of ride, a 17" can be more of a jiggle and feel bouncy. Some of this is down to the sidewall spring rate, it is reported that some 18" RFT's have a lower spring rate than the 17" RFT. Another aspect to consider is the suspension harmonics, some sizes work better on a given suspension set up. So the dynamics do not always conform to what we expect. HighlandPete
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