stormsaw
Posts: 27
Joined: Mon Aug 18, 2014 10:38 am

Winter Tires - CAUTION: DON'T MAKE THIS MISTAKE

Wed Dec 09, 2015 9:09 am

Hi Folks,
Had an interesting event yesterday. I ordered the Nokia snow tires from TiresByWeb (strongly recommend) for my wife's i3 Rex Giga. She doesn't like the aftermarket wheel options nor does she like the base wheels that BMW offers as part of their snow package, so I elected to have the Nokia's mounted on her existing wheels. For the Rex, the normal set-up has 155's in the front and 175's in the rear. The winter set-up calls for 155's on all four wheels. Note #1: you don't need a complete wheel set that is specific to 155's; the 155's will mount just fine on the rear wheels. Note #2: THIS IS THE IMPORTANT ONE... THE REAR WHEELS HAVE A DIFFERENT OFFSET THAN THE FRONT WHEELS. I took my tires to Mr. Tire to have them switched out. Mr. Tire inadvertently remounted the rear wheels on the front, and the front wheels on the rear. When I picked up the car and drove off, the winter tires seemed to be markedly noisier than the summer tires. I was surprised at the difference, but chalked if off to the tread difference. That was a mistake. In fact, the front tires were rubbing against the coil springs, due to the now-incorrect wheel offset.

Result: Smoking front tires, stuck on the side of a busy freeway in the dark while waiting for AAA.

Epilogue: In the dark I didn't know what had happened. Had it towed to Rockville BMW (Maryland). The next morning their service was great, and their charges were reasonable. They wrote something up for me to use at Mr. Tire. Mr. Tire agreed to reimburse for both of the shot tires as well as the bill from Rockville BMW.

SSi3
Posts: 230
Joined: Mon Sep 15, 2014 7:55 am
Location: Ontario, Canada

Re: Winter Tires - CAUTION: DON'T MAKE THIS MISTAKE

Wed Dec 09, 2015 10:30 am

Image
2015 i3 REx - born electric 4/25/15

stormsaw
Posts: 27
Joined: Mon Aug 18, 2014 10:38 am

Re: Winter Tires - CAUTION: DON'T MAKE THIS MISTAKE

Wed Dec 09, 2015 11:24 am

LOL! Thank you. You cheered me up.

rsplodge
Posts: 13
Joined: Fri Dec 11, 2015 12:29 pm

Re: Winter Tires - CAUTION: DON'T MAKE THIS MISTAKE

Fri Dec 11, 2015 1:17 pm

That's crazy!

However, I just wanted to confirm then that it is possible to mount the winter tires on both the front 5" and the back 5.5" rims?, as I've read some conflicting things about that.

I presume that is true for either the Nokians or the Blizzaks (?).

Did you bother with TPMS?

Thanks, ..Roger

jadnashuanh
Posts: 4199
Joined: Thu May 22, 2014 2:07 pm
Location: Nashua, NH USA

Re: Winter Tires - CAUTION: DON'T MAKE THIS MISTAKE

Fri Dec 11, 2015 2:49 pm

rsplodge wrote:That's crazy!

However, I just wanted to confirm then that it is possible to mount the winter tires on both the front 5" and the back 5.5" rims?, as I've read some conflicting things about that.

I presume that is true for either the Nokians or the Blizzaks (?).

Did you bother with TPMS?

Thanks, ..Roger

My car (a BEV) came with the staggered 19" rims and tires. THe BMW OEM winter tire set uses 5" for both the front and back (the tires are directional...make sure you get 2 of each, mine were mounted all for the right side!). Generally, a narrower tire works better in snow. IOW, narrower works in the rear, wider does not work in the front!

Depending on where you live, not having functional TPMS could mean failing an inspection. If they aren't there, the car will put up annoying warnings once it detects they aren't responding. Having that warning message/light up when you drive in to get the car inspected may cause it to fail.
Jim DeBruycker
2011 535i x-drive GT, 2014 i3 BEV

rsplodge
Posts: 13
Joined: Fri Dec 11, 2015 12:29 pm

Re: Winter Tires - CAUTION: DON'T MAKE THIS MISTAKE

Fri Dec 11, 2015 3:06 pm

jadnashuanh wrote:
rsplodge wrote:That's crazy!

However, I just wanted to confirm then that it is possible to mount the winter tires on both the front 5" and the back 5.5" rims?, as I've read some conflicting things about that.

I presume that is true for either the Nokians or the Blizzaks (?).

Did you bother with TPMS?

Thanks, ..Roger

My car (a BEV) came with the staggered 19" rims and tires. THe BMW OEM winter tire set uses 5" for both the front and back (the tires are directional...make sure you get 2 of each, mine were mounted all for the right side!). Generally, a narrower tire works better in snow. IOW, narrower works in the rear, wider does not work in the front!

Depending on where you live, not having functional TPMS could mean failing an inspection. If they aren't there, the car will put up annoying warnings once it detects they aren't responding. Having that warning message/light up when you drive in to get the car inspected may cause it to fail.


Thanks, but that's not my question. My question is if you can stick with the staggered rims (5" and 5.5") and mount the one size 155/70 R19s winters on both those size rims. The first post seemed to indicate that is what he did. Someone in the FB group also mentioned having done that.

Yup we're fine in Ottawa, Canada without TPMS in terms of inspection, or at least it's never been an issue for me. We've done it on other cars. The only inspection we have is a drive-clean test every 2 years or a safety inspection upon purchase. Yes the light can be annoying.

...Roger

jadnashuanh
Posts: 4199
Joined: Thu May 22, 2014 2:07 pm
Location: Nashua, NH USA

Re: Winter Tires - CAUTION: DON'T MAKE THIS MISTAKE

Fri Dec 11, 2015 8:28 pm

The reason the tires differ on the i3 with staggered wheels is to keep the OD the same. Putting the narrower tire on the wider wheel should be within the tire's capabilities, but it will make the OD smaller, affecting the odo putting on more miles than actually covered, and making the speedo show even higher speeds than actual.

Don't Canadian vehicles get the pressure check via tire rotation verses TPMS? If so, it probably won't be issuing any errors verses those markets where they use an in-wheel TPMS module.
Jim DeBruycker
2011 535i x-drive GT, 2014 i3 BEV

rsplodge
Posts: 13
Joined: Fri Dec 11, 2015 12:29 pm

Re: Winter Tires - CAUTION: DON'T MAKE THIS MISTAKE

Sat Dec 12, 2015 6:39 am

jadnashuanh wrote:The reason the tires differ on the i3 with staggered wheels is to keep the OD the same. Putting the narrower tire on the wider wheel should be within the tire's capabilities, but it will make the OD smaller, affecting the odo putting on more miles than actually covered, and making the speedo show even higher speeds than actual.

Don't Canadian vehicles get the pressure check via tire rotation verses TPMS? If so, it probably won't be issuing any errors verses those markets where they use an in-wheel TPMS module.


I assume the i3 here uses the TPMS sensors like many other newer cars in Canada. I know there are some cars that do it based on other means like in my Mini Cooper a Clubman but most use TPMS I thought.

jadnashuanh
Posts: 4199
Joined: Thu May 22, 2014 2:07 pm
Location: Nashua, NH USA

Re: Winter Tires - CAUTION: DON'T MAKE THIS MISTAKE

Sat Dec 12, 2015 10:45 am

rsplodge wrote:
jadnashuanh wrote:The reason the tires differ on the i3 with staggered wheels is to keep the OD the same. Putting the narrower tire on the wider wheel should be within the tire's capabilities, but it will make the OD smaller, affecting the odo putting on more miles than actually covered, and making the speedo show even higher speeds than actual.

Don't Canadian vehicles get the pressure check via tire rotation verses TPMS? If so, it probably won't be issuing any errors verses those markets where they use an in-wheel TPMS module.


I assume the i3 here uses the TPMS sensors like many other newer cars in Canada. I know there are some cars that do it based on other means like in my Mini Cooper a Clubman but most use TPMS I thought.

It's easy to check...if your stems are metal...you have TPMS, if they are rubber, you do not.
Jim DeBruycker
2011 535i x-drive GT, 2014 i3 BEV

stormsaw
Posts: 27
Joined: Mon Aug 18, 2014 10:38 am

Re: Winter Tires - CAUTION: DON'T MAKE THIS MISTAKE

Tue Dec 15, 2015 8:21 am

Hi Roger,
Yes, you are correct. I mounted the 155 Nokia's on all four wheels (155's in the front wheel, 175's in the rear wheel). I have now replaced the two Nokia's that were trashed when Mr. Tire put the rear wheels on the front and the front wheels on the rear. They work just fine (I have 100 miles on them since yesterday).

Had another experience that illustrates how different the i3 setup is compared to anything else that a tire shop routinely experiences. They filled all four tires to 33 psi, following the door label which specified 33psi for the 155's and 41psi for the 175's. In this instance the tire width doesn't matter; the spec is for 41psi in the rear, regardless of tire size. Of course the tpms flagged 'low pressure' but the system has a long time constant... it didn't indicate low pressure until a good 3 or 4 miles down the road. Easy fix of course.

For all the hassle I experienced with a franchise tire outfit, I think I will go to bmw for the tire swap in the future. The extra few bucks are worth the hassle savings. The extra bucks are also a factor to consider when you are pondering whether or not to purchase a complete winter wheel set. In our case my wife simply doesn't care for any of the wheel options that are presently offered - either the bmw wheel package or the Tire Rack aftermarket option. 'tis her car, so there you go. Hopefully other aftermarket options will show up next year.

Side note: I swear the regenerative braking felt differently when the rear tires were at 33psi. It seemed to be noticeably weaker.

-Syd

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