Last post on Sep 18, 2013 at 7:28 AM
You are in the BMW Z4
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BMW Z4, Coupe, Convertible
#53 of 86 Re: winter tires [esfoad]
Dec 01, 2008 (11:11 am)
Wondering what model Z4 you're driving and what snows/rims you bought. I have 3.0 with sport package and I'm concerned about clearance issues. Thanks.
#54 of 86 Re: winter tires [2buffalo]
Dec 22, 2008 (8:48 am)
Sorry for the late reply. I have a 3.0Si non sport package. I bought the recommended size from Tirerack including the TPMS sensors. I believe they are 205/55/17's.
#55 of 86 Run flat tires
Mar 29, 2009 (5:17 am)
Just purchased a Z4 and need help understanding the run flat tires that came on vehicle. Do I understand correctly that there is a tire made by Yokohoma that is a run flat that gives you longer wear, or is it a tire that you can use to replace run flats. If I replace my tires with non run flats will this void my warranty, or cause stress on the rims in any way?
Thanks for any help you can provide.
#56 of 86 Re: Run flat tires [candy9]
Apr 08, 2009 (12:08 pm)
1. No. You won't void your warranty by using non-run flat tires. What's more, your low tire pressure warning will work with non-run flat tires too because it is based on a change between the rate the wheel spins compared to the speed of the other wheels. The wheel of a tire that is getting low on air pressure spins at a different rate. Bingo, low pressure warning still works.
2. Depending on if you have BMW install your non-run flat tires, or Joe Schmoe's Tire Shop, will depend determine to a large degree if your rims get scratched when the new tires are put on the rim. BMW service shops have a special tire machine and/or they take far better care (generally) when replacing your old tires with new and are much less likely to scratch your rims (so I was told).
3. The BMW factory Run Flats are the finest match for road grip - bar none. The down side? They only go about 20,000 miles before you start experiencing a lot of tire leaks and then losing your grip on acceleration or wet roads. If you try to drive on summer tires when the temps dip much below 37 F or especially 32 F (freezing), your car will drive as if possessed in the movie 'The Exorcist' until they warm up in 5-10 minutes (which accelerates wear on the tires - lord only knows what it does for wear on the suspension and steering linkages). I'm talking about the end of the world violent shaking of the steering wheel at any speeds over 10-25 mph. Perhaps she smooths right out at speeds over 100 mph, but I never wanted to test it - I never got over 35 mph like that (lol).
I bought a pair of non-run flats after 32,000 miles on my Factory Equipped run-flats (and they should have been replaced around 22,000 miles). But the non-run flats have about 95% of the grip on dry roads, twice the grip on wet roads and double the service life. I have 25,000 miles on my non run flats and not one single tire leak (knock on wood). I'm just getting ready to rotate them for the next 25,000 miles. Plus, they are all season radials and they go in snow (unlike the orginal BWM summer tires). I absolutely love them.
My advice, wait until you really need a new set of tires before making the switch to non-run flat. When you do, you will never look back. (oh, did I mention I got the entire set for $400 and mounted for $10/tire!). I can't tell you what a pain in the butt it was putting air in the run flat tires every few days, then using flat fix to get me through another few months. Plus, you get to laugh at the service rep at your 15,000 mile service interval that trys to sell you "Nitrogen Air Fill" for your tires to stop the likelihood of slow leaks. Since changing to non-run flats, I haven't had a single slow leak, a single problem and will never go back again. (half the price and zero of the worries - teehee)
Okay, again - if you keep "your baby" in the garage 9 months of the year and only take it out on Sundays and wipe it with a diaper - stick with the Run Flats. But if you are in the snow and ice belt and want to drive your car year round - go with non-run flat all season radials. I still take curves at twice the "suggested" limit and never have a problem (knock on wood).
#57 of 86 Re: Run flat tires [markwell]
Aug 09, 2011 (10:17 am)
I ran over a ***** pothole today and the sidewall of one of my front tires blew a hole (or tear). I'm considering a non-run flat because it seems like they perform better...(I agree...when it rains I actually don't always feel confident about the traction).
Which brand tire did u buy and I'm assuming you took it to some body shop to replace?
thanks so much!
#58 of 86 Re: Run flat tires [markwell]
Aug 23, 2009 (7:01 pm)
Excellent Tip Markwell.
I have an 05 Z4 Sport w/18 wheels. I live in Northern VA so we do get the best/worst of weathers here. Had to replace the factory RFT's (which are summer tires) recently thanks to a flat. I replaced them with All season performance Non-RFT's which were a fraction of the cost and the ride has improved tremendously. I now have Falken ZIEX 912 in the front and ZIEX 512 for the rear tires.
1) The first tire dealer I went tried to sell me All season Michelin Sports tires which were $250-$350 Front/Rear bringing the total cost to $1450 (Incl.a Difficult Installation charge of $60 for all 4 tires?! given they had to remove RFT's). I told them I would get back to them. I then proceeded to call Tires Plus.
2) Tires plus has Falken's for $140 (front tires only).I decided to take a chance with them, I had both tires replaced and discarded the RFT's. I decided to research online for the rear tires and found the Falken ZIEX 512's for $160 each plus free shipping at Discounttiredirect.com.
I'll admit I had never heard of Falken prior to purchase but having made the switch I couldn't be happier. The OEM Bridgestone RFT's were ridiculous with me having to pump air every week at least once in addition to them being prone to damage easily. The switch to Non-RFT's were definitely worth it without breaking the bank.
#59 of 86 Re: Run flat tires [calvinc22]
Oct 01, 2009 (12:08 pm)
Calvin asked what brand of tire?
Answer: YOKOHAMA Avid 4's
Size: P225/50R16 91V
Car: BMW Z4 2004 (2.5 liter) still like new and I'm still milin and smilin.
Cost: $89 a tire from tire rack
Mounting and Balancing: $10/tire cash paid to one of the service guys at BJ's Wholesale Club. Satisfaction with putting the new tires on? Ya get what ya pay for. 2 of the 4 rims have a thin scratch because they didn't have the special "BMW" tool. But I was able to get 97% of the scratch off with a magic eraser pad and some heavy elbow grease.
Satisfaction with the Tires: AWESOME!!!!
I've got 38,000 miles on these tires now. I rotated them after 30,000 miles and they still grip great and have plenty of tread left. Okay, the back tires do cut loose a tad more than when new if I tromp on it on wet roads from a stop light. Apart from that, I really think I'm going to get close to 60,000 miles off these and no complaints. I can't imagine a better tire for the long haul and all season too. Price, Value, Performance - unsurpassed by any other.
#60 of 86 Twitchy, Jumpy Steering--'07 Z4 Roadster
Feb 13, 2010 (6:58 pm)
I bought a new '07 Z4 from a Denver dealer in July 2007. At about 3,000 miles, the dealer aligned the front-end. After that, the steering was sensitive to every bump, bulge or break in the road. Smooth roads at highway speeds were fine. But when driving in town between 25 and 50 mph the car was hard to handle.
On a crowned road, the steering pulls "downhill". If I hit a bump or pothole, the steering abruptly pulls to one side then the other. If there is a seam that runs parallel to the direction of travel, the wheels grab onto the seam. The steering feels jittery, twitchy and unpredictable. It's impossible to drive in town without worrying that the car may lurch into a curb or a hit parked car. So I drive with a "death grip" on the wheel.
I took the Z4 back to the dealer 4 times in 18 months, each time expecting the problem to be fixed. First the alignment was re-adjusted (apparently it was incorrectly aligned to M-model specs). On later service appointments, the alignment was checked again. Tire pressures checked. Nothing helped.
Frustrated, I took my car to an independent BMW garage. After a test drive, the shop owner confirmed the problem. He asked if the run-flat performance-rated tires (Bridgestone RFT (225/45 R17 front, 245/40 R17 rear) had ever been evaluated as a possible cause. To my knowledge, "no".
So I took the car to a second Denver BMW dealer. After hearing my concerns, the service manager said he thought the tires were causing the problem. So he swapped tires with another Z4 on the lot. After the swap, my car drove normally once again. Oh, happy day!!! But he had to swap them back. So I drove home with a jumpy car.
Now I'm headed back to the original dealer to see if I can get them to replace the tires. I think I'm entitled to new ones. The original set was covered for defects by a $750 tire policy I bought when I took delivery. The dealer may try to weasel out of that. Plus I don't know what to do about Run-Flat Tires. Does anyone have enough experience with this issue to know that RFT's are (or are not) part of the problem. Or is it the "performance" design of the tire? Or is it because they are Bridgestone tires? Or is it just a bad set of tires?
I would appreciate any advice, especially on how to get the dealer to "man-up" and take responsibility for replacing all four tires. I want to feel safe on the road and with spring just around the corner (maybe) I want to enjoy the ride again!
#61 of 86 Re: Twitchy, Jumpy Steering--'07 Z4 Roadster [steveclemens]
Feb 15, 2010 (11:23 am)
Twitchiness of the Z4 is built into the design. It is an unfortunate con to the tilt of the front wheels when you turn. The pro is that you can take tight corners at higher speeds. The con is that the car quickly pulls left or right when you get close to ridges or ruts. Once used to it, it's no big deal.
I think the issue is made worse with the run flats. Run flats let you feel the road surface more, every bump, every pull and ridge. Its all trade offs. I have 50,000 miles now on my Yokohama's AVID 4 all season radials. They grip better than ever on clean dry roads, there's still an 1/4 inch tread left - but I can't take the car out if its snowing - I mean at all. It was fine up until about 40,000 miles, but no snow/ice handling at all now. I'm trying to get them to stretch to May. I hate getting tires more often than once every 2 years - but then at $500 for a set of 4 mounted and balanced - I have no complaints.
I've got 80,000 miles on my 04 Z4 and have yet to need an alignment. I've hit some pretty bad pot holes and a curb once - but this car rides true and straight without pull or side wall wear. I think the car is a marvel of engineering perfection. Only the ridge affect is all I've noticed and it is minor since I dropped the run flats.
#62 of 86 Re: Twitchy, Jumpy Steering--'07 Z4 Roadster [markwell]
Feb 15, 2010 (11:57 am)
Thanks for sharing your views about my steering problem. In almost every other respect, I love my Z4. However I've had more than my share of problems. I'm on my third manual transmission--the first two frequently got so stuck in 6th gear I had to pull over, stop and use both hands to get the transmission into neutral! I'm also on my second radio--the first one would light up but no sound would come forth.
I wish I could agree with you about the steering. But I'd rather have predictable steering than a car that tramlines with every defect in the road. As far as I'm concerned, this is a serious safety issue. If I can't get it resolved fairly soon with new tires, this baby is going bye-bye! Why would I want to take tight corners at high speed if I end up hitting the curb or another car!