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X5 E70 (2007 - 2013)
E70 BMW X5 produced between 2007 and 2013. Discuss the E70 X5 with other BMW owners here.

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  #1  
Old 03-22-2013, 10:49 PM
DCC DCC is offline
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Another RFT vs Non RFT

My question is alittle different...
For those of you with this knowledge, please share your opinion:

On a 35i without AD, will a set of 214s on regular tires ride the same/better/worst than the stock 19s with RFTs?

Thanks in advance
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  #2  
Old 03-22-2013, 11:55 PM
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IMPOSSIBLE without knowing which tire models you are comparing!!
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Old 03-23-2013, 06:36 AM
DCC DCC is offline
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Here are the 2 tire models

19" = http://www.tirerack.com/tires/tires....odClar=Premium

20" = http://www.tirerack.com/tires/tires....vity%20Package

The 19s are RFT and the 20s are not
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Old 03-24-2013, 09:24 AM
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I think the question here is "what are you looking for?".

Given the cars listed in your sig, I would say you will be happier with the Contis. I can't speak for 20s since my '08 is a work truck and I have 19s with non-RFTs. The 20s add a different dimension IMO that precludes bouncing around jobsites and everyday use. I could be wrong but they looking "waxer-esque" to me.

I had the Bridgestones for the first 30K miles. I am at 109K and on my second set of Toyo Proxes STIIs. Less unsprung weight and better grip over the RFTs.
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Old 03-25-2013, 05:51 PM
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I guess i really was trying to get an opinion on whether the 19 run flats ride harder than a set of 20s non run flats...or is it pretty much the same trade off with the difference in sizes.
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Old 03-25-2013, 06:07 PM
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Originally Posted by DCC View Post
I guess i really was trying to get an opinion on whether the 19 run flats ride harder than a set of 20s non run flats...or is it pretty much the same trade off with the difference in sizes.
I wouldn't have the 20s. They are pretty, but really I see no way that they enhance the performance of the vehicle. Now if you are just cruz'n ...................
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Old 03-25-2013, 08:47 PM
ard ard is online now
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Quote:
Originally Posted by DCC View Post
I guess i really was trying to get an opinion on whether the 19 run flats ride harder than a set of 20s non run flats...or is it pretty much the same trade off with the difference in sizes.
People treat "RFT" like it is ONE tire. There are many versions of runflats by many vendors. You cannot make a sweeping generalization.

Michelin has a superior runflat design, IMO. Wouldnt you then be forced to say 'Mich RFT in 19 versus _______ in 20" which is better?'.

If I had to opine I'd say the 19" rft would be superior in handling and ride to the same mich model in the 20.

But totally opinion. Trying to find an informed opinion from people who have actually driven what you are seeking to compare will be a challenge. Especially with "ride harder" as the metric you are trying to define.

I seem to recall that tire compliance varies dramatically with sidewall- it is at least square root and perhaps a higher order...

Sounds like you want to be told "yeah, upgrade to 20s and go non-rft and you'll be fine"
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Old 03-25-2013, 08:58 PM
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You must be referring to the Michelin Latitude Touring model right? I may have to read up on them more, sounds like you are a big fan of them.
I am considering the larger wheels, but not at the expense of giving up more ride comfort from the 19s RFT.
So either size works for me, as long as ride comfort is considered.
Thanks
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Old 03-26-2013, 02:18 AM
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ductman ductman is offline
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Quote:
Originally Posted by DCC View Post
You must be referring to the Michelin Latitude Touring model right? I may have to read up on them more, sounds like you are a big fan of them.
I am considering the larger wheels, but not at the expense of giving up more ride comfort from the 19s RFT.
So either size works for me, as long as ride comfort is considered.
Thanks
My X came with the Michelin RFT ( 18in ) , I was happy to see them instead of the Bridgestone's, I found the Michelin's noisy and harsh riding and just chaulked it up to it being a RFT, I needed new tires around 30k back in DEcember however the Michelin's were on backorder till April, I had no other choice in RFT and purchased the Bridgestones, I have approx 5k on them and find them quieter, smoother and much more responsive than the Michelin's ever were and yes I do remember how the Michelin's felt when they were brand new. Just my opinion, the Michelin's are not worth the extra 100 dollar per tire entrance fee.
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