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E70 X5 M / E71 X6 M
Forum for the all-wheel-drive models BMW X5 M and BMW X6 M.

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  #1  
Old 03-08-2013, 03:24 PM
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dkreidel dkreidel is offline
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Another runflat rant

Today the skies cleared and the county plowed the roads last night, so having nothing better to do I made some comparisons with my 3 sets of wheels:

1) OEM 300M 20" with Bridgestone Dueler 275 front / 315 rear run-flats

2) BBS SV 10 x 20" square set-up with Conti 295/40 DWS conventional

3) OEM 298M 9x19" square set-up with Pirelli Scorpion Winter 255/50 conventional

Bottom line, the stock run-flats are like wagon wheels compared to either the Cont's or Pirelli Winters. I've had the snow tires on for a while and had forgotten how awful run-flats are since the other cars all had them exorcised early in their lives. I kept all the tire pressures at 38/38 just to make it a fair comparison. With the roads finally dry, I made sure Launch Control was working on the Contis and crappy run-flats... especially the run-flats

The run-flats went back in the hangar and the Pirelli Winters went back on since more snow is expected on Monday. As an aside, both the Pirelli's and Contis are much, much quieter than the stock Duelers - surprising to me given the agressive snow/ice tread patterns.

dk
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'13 X5M - carbon black over black • BBS SV • "it's our truck"
'13 X5 35i - alpine white over black • X5M wheels & tires • "it's our car"
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...and a bunch of old English motorcycles

Last edited by dkreidel; 03-25-2013 at 02:20 PM.
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  #2  
Old 03-08-2013, 05:42 PM
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There's one thing I know about a new BMW, if it comes with runflats, then it needs lighter wheels and nonRFTs. I learned this lesson twice with my 335d and 550i, so when it came time for the X5M there wasn't a second thought about swapping out the RFTs.
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  #3  
Old 03-09-2013, 10:11 AM
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Die Wolfe Die Wolfe is offline
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Quote:
Originally Posted by dunderhi View Post
There's one thing I know about a new BMW, if it comes with runflats, then it needs lighter wheels and nonRFTs. I learned this lesson twice with my 335d and 550i, so when it came time for the X5M there wasn't a second thought about swapping out the RFTs.
I don't have as much experience as you guys do with BMW and RFTs, so I don't understand why they're hated so much? I have them on my wife's 535i and my X5M but I don't know the difference? How much better will it ride/feel with non RFTs? I thought they handled well now but if it could be improved, I'd like to know how!
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Old 03-09-2013, 06:12 PM
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Originally Posted by Die Wolfe View Post
I don't have as much experience as you guys do with BMW and RFTs, so I don't understand why they're hated so much? I have them on my wife's 535i and my X5M but I don't know the difference? How much better will it ride/feel with non RFTs? I thought they handled well now but if it could be improved, I'd like to know how!
Where to start? With an RFT, you basically have a rubber coated wheel rather than a wheel and a pneumatic tire. To make matters worse, BMW needed to make the wheels to be heavier/stronger to handle the lack of cushioning. So, when you hit a pothole the shock & spring needs to absorb the entire impact. I believe that the E-Series (E70 & E90) had suspensions that weren't soft enough for the RFT set-up, so they suffer from what many around here call pothole explosions which is when the suspension bottoms out with a resounding boom. I believe the F10 was designed with a softer suspension to handle the RFTs, but swapping the RFTs out is quite common here at the Fest, which does soften the F10's ride... maybe a bit too much, but that's where stiffer springs or Dinan's shock reprogram helps F series cars recapture their classic feel. I hope to pick-up my 6er next week and I will do the obligatory tire/wheel change. If it rides too soft, then despite being equipped with sport suspension, then my theory is correct and the car will need a Dinan fix.
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  #5  
Old 03-10-2013, 08:24 AM
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I had a graphic lesson in the weight of runflats hoisting the 315 section rear tires/wheels a few inches on the rear axle the other day!

Dunderhi, I think you will find the 650 ride improves with non-runflats but not as much as E series or your X5M. My 650 was the first BMW I've owned that I didn't IMMEDIATELY ditch the runflats, and actually burnt up the not too bad Dunlop 20's that it came with. Sadly, that only took 11,000 miles but I was happy with the ride improvement with the Hankook Ventus V12's. I used to occasionally set the shocks to Comfort with the runflats, but with the 'kooks it is either Standard or Sport shock settings.

Die Wolfe - it looks like the X5M will be migrating South to Morgan Hill for the Dinan tune so you are welcome to put my Conti DWS on your ride for a couple of hours to see the difference.

Dick
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'13 X5 35i - alpine white over black • X5M wheels & tires • "it's our car"
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...and a bunch of old English motorcycles
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  #6  
Old 03-11-2013, 06:14 AM
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dkreidel, thanks man! Let me know when you roll down!
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  #7  
Old 03-13-2013, 01:53 PM
scotts10x5m scotts10x5m is offline
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I just sold my near-takeoff RFT Dueller's and bought a set of performance Nittos in the stock size. . . and got the wheels redone in matte black. . . and got the windows tinted. . I pick it up tomorrow afternoon in SF, can't wait to see it!
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  #8  
Old 03-13-2013, 03:09 PM
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Die Wolfe Die Wolfe is offline
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Originally Posted by scotts10x5m View Post
I just sold my near-takeoff RFT Dueller's and bought a set of performance Nittos in the stock size. . . and got the wheels redone in matte black. . . and got the windows tinted. . I pick it up tomorrow afternoon in SF, can't wait to see it!
Nice! I definitely wanna see how they look with the non RFTs....
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Old 03-13-2013, 04:28 PM
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Quote:
Originally Posted by scotts10x5m View Post
I just sold my near-takeoff RFT Dueller's and bought a set of performance Nittos in the stock size. . . and got the wheels redone in matte black. . . and got the windows tinted. . I pick it up tomorrow afternoon in SF, can't wait to see it!
So a black/black/black X5M. That will be pretty mean looking.
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  #10  
Old 03-23-2013, 10:53 PM
Norefjell Norefjell is offline
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What do you guys use as a spare?
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  #11  
Old 03-24-2013, 06:57 AM
Fm750i Fm750i is offline
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You don't really need a spare. Just buy a BMW Mobility kit or something similar. I took the run flats off of my 750 and it was a different car. Traded the 7 for a new X5M. Just replaced the RFs on a 2011 328xi and it rides much better. Replaced the Bridgestone run flats with Nitto Motevo's. So far I don't see any downside about the switch. The biggest challenge with the X5M is the limited selection of tires in the stock size. I'm looking at both the Continental DWS or the Nitto Motevo's both are all season rated.
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  #12  
Old 03-24-2013, 06:52 PM
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My X5M came with a spare under the cargo area.
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Old 03-24-2013, 07:56 PM
Fm750i Fm750i is offline
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Yea. If you ordered it or the dealer ordered it. It's probably the only option I didn't get! Wish I had.
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  #14  
Old 03-25-2013, 02:16 PM
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Quote:
Originally Posted by Fm750i View Post
Yea. If you ordered it or the dealer ordered it. It's probably the only option I didn't get! Wish I had.
Me too

Quote:
Originally Posted by dunderhi View Post
My X5M came with a spare under the cargo area.
Any chance on posting a couple of pics on what's in the spare compartment? I really want to understand how the space saver wheel copes with the differences in centerbore front and rear. I've got the Mobility kit from an old M3 and a new can of slime but am not sure if I'd have the guts to use it.
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'13 X5M - carbon black over black • BBS SV • "it's our truck"
'13 X5 35i - alpine white over black • X5M wheels & tires • "it's our car"
'11 Z4 - mojave over beige • 6 speed manual • Mόnich delivery

...and a bunch of old English motorcycles

Last edited by dkreidel; 03-25-2013 at 02:19 PM.
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  #15  
Old 03-26-2013, 06:07 AM
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Any chance on posting a couple of pics on what's in the spare compartment? I really want to understand how the space saver wheel copes with the differences in centerbore front and rear. I've got the Mobility kit from an old M3 and a new can of slime but am not sure if I'd have the guts to use it.
I took a shot before Mrs D took off for work this morning. I will take a closer look tonight to see if there is a centering ring, which I suspect there will be.

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As you can see, I have the compressor from BMW mobility kit and a safety vest. There is also a plug kit and can of Fix-a-Flat in that bin. This is what I carried in the 335d which had nonRFTs and no spare. I didn't have anything else to planned for that equipment, so just transferred it over to the X5.

Now going off-topic: I'm having doubts that Spring will ever get here, so here's a pic I took yesterday of the snow tires from the 335d. I'm not sure if this was how I was supposed to use them.

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Name:	 <a href='http://www.tirerack.com/a.jsp?a=AB2&url=/winter/index.jsp' target='_blank' class='gal'>Snow  <a href='http://www.tirerack.com/a.jsp?a=AB2&url=index.jsp' target='_blank' class='gal'>tires</a></a>.jpg
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Old 03-26-2013, 07:20 AM
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dkreidel dkreidel is offline
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Thanks for the pics! I too suspect there must be a centering ring for using the spare on the rear - or BMW figures the conical seat lug bolts will center up the spare "good enough" for a few miles.

It's interesting the "fuzzy" spare compartment liner is MIA on your car; there must not be enough clearance for the liner and the spare. I really don't understand why dealers don't order every X5 with a spare for a measly $150. I have the same compressor, a can of official BMW slime, a yellow vest and a SIG 226 .40 S&W in the cubby.

We missed the last storm in MT - so it's rain and light flurries here for the next month or two. That's an amazing amount of Spring snow you have there. Just light up the BBQ to defrost it and you're all set to grill and chill

Dick
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'13 X5M - carbon black over black • BBS SV • "it's our truck"
'13 X5 35i - alpine white over black • X5M wheels & tires • "it's our car"
'11 Z4 - mojave over beige • 6 speed manual • Mόnich delivery

...and a bunch of old English motorcycles

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Old 03-26-2013, 05:06 PM
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Hmm...I thought a SIG was for making holes not patching them up. Maybe you should keep in in a different compartment, before you end up putting holes in your already flat tire.
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Old 03-26-2013, 05:43 PM
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Hmm...I thought a SIG was for making holes not patching them up. Maybe you should keep in in a different compartment, before you end up putting holes in your already flat tire.
It's for these

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...and a bunch of old English motorcycles
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Old 03-26-2013, 07:33 PM
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I wrestled one of those back when I was in my early twenties. They're not so tough. Well, uh... I didn't quite win and he was muzzled, but I lived to tell the tale.
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Old 03-26-2013, 10:06 PM
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I wrestled one of those back when I was in my early twenties. They're not so tough. Well, uh... I didn't quite win and he was muzzled, but I lived to tell the tale.
I hope you weren't wrestling with a griz with paws like this 1,300# bruin...

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...and a bunch of old English motorcycles
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Old 03-27-2013, 05:05 AM
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I hope you weren't wrestling with a griz with paws like this 1,300# bruin...

It was a little East Coast bear - with a claimed weight of 600lbs (other accounts claim 450). I think those long pointy things at the end of his paws where missing... yup pretty sure of it. Anyway, the bear was well trained and after it dispatched the four fools (me included) he took a bottle of coke which was handed to him be a scared little girl and drank it down. It was a bit interesting since as a wrestler, I thought it would be easy to knock the bear of its balance, by throwing my shoulder into his shoulder and grabbing a front leg. Unfortunately, it went downhill from there, since I couldn't get his front leg to budge off the ground. It was solid. The bear then grabbed-up one of my legs (easily) and proceeded to spin me around in a circle. I had outstanding balance back then and staid upright. The trainer broke us up and encouraged me to hit the bear low to encourage him to stand upright (a crowd pleaser). I wanted to win (a car was at stake) so I kept trying to wrestle him properly, but to no avail and the trainer called it a draw. The other guys each got the bear to stand up and each one was crushed like a paper cup on the way to being pinned by the bear. They held a drawing for us losers and someone else got the car. Too bad. Anyway, activities like those are long gone, replaced by things like bungee jumping and extreme sports.
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Old 03-27-2013, 07:48 AM
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Wow! What a great story and memories! We had a medium-sized brown bear wander onto the deck last year so we all moved quickly into the house to wait him out. Can't imagine wrestling a bear as they are incredibly quick and strong - as you found out. Hopefully, the pistol will remain dormant in the trunk of the X5M but in rural NW Montana wildlife is an everyday occurrence and firearms are de rigueur.

EDIT: plenty of wildlife in SoCal too but most of it is the two-legged variety

dk
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'13 X5M - carbon black over black • BBS SV • "it's our truck"
'13 X5 35i - alpine white over black • X5M wheels & tires • "it's our car"
'11 Z4 - mojave over beige • 6 speed manual • Mόnich delivery

...and a bunch of old English motorcycles

Last edited by dkreidel; 03-27-2013 at 07:49 AM.
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