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  #1  
Old 09-10-2018, 11:36 AM
jtmat jtmat is offline
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Mein Auto: 2015 435i Turbo Vert
New tire purchase -- front tires currently 255/40 though

I purchased a 2015 435i convertible (m-sport) last month... nice car.

I've searched / read this forum for months before the purchase and want to say thank you! for all the contributors.

My issue:

From what I can tell, my tire setup should be:

Front: 225/40 19
Rear: 255/35 19

What I have (what I don't understand):

Front 255/40 19
Rear: 255/35 19

I'm going with non-run flats DWS06s and have the following questions:

1) Should I keep the same size tire (255) on the front?

2) What is the upside or downside of going from the 255s to 225s on the front? I'm thinking of ride quality, grip, etc.

3) Keeping with #2, what would you do with the front tire setup?

4) Does it matter where I get the tires put on? I normally go to Walmart in Northern VA... or should I take the BMW someplace else? Walmart there sees a lot of cars, and I'd guess a lot of BMWs.


I have until the end of Oct to make a purchase.

Thank you for your answers... look forward to contributing to the forum.



Last edited by jtmat; 09-10-2018 at 12:42 PM.
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  #2  
Old 09-10-2018, 02:34 PM
Autoputzer Autoputzer is online now
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Go with what the door decal says, Front: 225/40 19 and Rear: 255/35 19 . Go on TireRack.com and learn what those tire size numbers mean. Too large of a tire can rub, especially on the front. You're also more prone to hydroplaning. I'm surprised the mis-matched tires didn't confuse the traction control and stop the car from running. That was the problem with a used Corvette a co-worker bought.

Don't take a BMW anywhere near a Walmart, parking lot or car repair shop. They'll trash your rims, maybe the whole car, and then say "Shazam! How'd that happen?" when you confront them about it.

You need to find a tire store with a lever-less tire machine that will not scratch the hell out of your rims while pulling the old tires off the rims. Tire Rack's list of local installers also lists their tire machine make and model . Google those to see if they're lever-less.

Think real hard about a donut spare and jack kit. I've read it will fit in the trunk... barely. If you get a flat, the flat tire and wheel will need to go in the back seat. Carry some large leaf bags to protect the interior. Bimmerzone.com sells donut spare tire kits for BMW's.

I had some DWS06's on a Honda. They're good, but you have to really goose up the pressure to get them to wear evenly. I've had the same issue with two sets of Conti' DW's. Michelin also makes an all-season, non-RFT performance tire. I've found Michelin's wear more evenly at lower pressures. So, they ride better and/or last longer than similar Conti's.

Last edited by Autoputzer; 09-10-2018 at 06:20 PM.
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  #3  
Old 09-10-2018, 04:20 PM
luigi524td luigi524td is offline
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Mein Auto: '17 540xDrive; '98 Z3 2.8
The previous owner must have had someone install the incorrect front tires; replace them with the "correct" size F&R with whatever UHP tires you choose. Yes, Tirerack does have good research reports on their website - I trust, to a lesser degree, the owner reports ... everyone's take on these things vary and it's next to impossible to equate their reports to your specific driving patterns and style. My preference is to stick with the top-rated tire brands. As for installation - you've been given advice already. Drive far away from tire stores that don't have the proper equipment and trained employees - it's NOT WORTH THE RISK of getting your wheels chewed up or your TPMS ripped out of the wheels ... all to save a few $$'s.
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  #4  
Old 09-11-2018, 03:08 AM
jtmat jtmat is offline
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Mein Auto: 2015 435i Turbo Vert
Quote:
Originally Posted by Autoputzer View Post
Go with what the door decal says, Front: 225/40 19 and Rear: 255/35 19 . Go on TireRack.com and learn what those tire size numbers mean. Too large of a tire can rub, especially on the front. You're also more prone to hydroplaning. I'm surprised the mis-matched tires didn't confuse the traction control and stop the car from running. That was the problem with a used Corvette a co-worker bought.

Don't take a BMW anywhere near a Walmart, parking lot or car repair shop. They'll trash your rims, maybe the whole car, and then say "Shazam! How'd that happen?" when you confront them about it.

You need to find a tire store with a lever-less tire machine that will not scratch the hell out of your rims while pulling the old tires off the rims. Tire Rack's list of local installers also lists their tire machine make and model . Google those to see if they're lever-less.

Think real hard about a donut spare and jack kit. I've read it will fit in the trunk... barely. If you get a flat, the flat tire and wheel will need to go in the back seat. Carry some large leaf bags to protect the interior. Bimmerzone.com sells donut spare tire kits for BMW's.

I had some DWS06's on a Honda. They're good, but you have to really goose up the pressure to get them to wear evenly. I've had the same issue with two sets of Conti' DW's. Michelin also makes an all-season, non-RFT performance tire. I've found Michelin's wear more evenly at lower pressures. So, they ride better and/or last longer than similar Conti's.
Thank you for your post. I appreciate it!

I know what the numbers mean... I was confused by the tires placed on the car. No rubbing so far... rain driving is fine.

I've had walmart fix/install tires since the 90s for me... never an issue. I'll think about going to a tire specialist. Unfortunately, some of the "recommended" places on tirerack I would never visit due to local reputation. Some you go in and all of a sudden the bill is $2000 more than quoted. Walmart never has that issue. Plus, last time I was there, they had a 440i putting new tires on it. They service a lot of BMWs at the location I visit. I'll think about it and research the tools used to work on tires.

I've almost ruled out a spare for full-time use. I have the tow service. Truth is I've not had a flat that left me stranded since the 70s (and I was not driving). Since the 80s, I've had to repair one tire with repair kits on side of road... another I was able to make it to a local shop for a patch. The trunk space on the verts is nonexistent anyway. I may purchase a spare for long trips in the winter though.

Thanks for the advice on Michelin... I'll take a look. I purchased the DWS06s for my mustang and they were a dream... and people on this site recommend them for their BMWs. I tend to go with what I know.
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Last edited by jtmat; 09-11-2018 at 03:15 AM.
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  #5  
Old 09-11-2018, 03:12 AM
jtmat jtmat is offline
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Join Date: Jul 2018
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Mein Auto: 2015 435i Turbo Vert
Quote:
Originally Posted by luigi524td View Post
The previous owner must have had someone install the incorrect front tires; replace them with the "correct" size F&R with whatever UHP tires you choose. Yes, Tirerack does have good research reports on their website - I trust, to a lesser degree, the owner reports ... everyone's take on these things vary and it's next to impossible to equate their reports to your specific driving patterns and style. My preference is to stick with the top-rated tire brands. As for installation - you've been given advice already. Drive far away from tire stores that don't have the proper equipment and trained employees - it's NOT WORTH THE RISK of getting your wheels chewed up or your TPMS ripped out of the wheels ... all to save a few $$'s.
Thank you for your post.

At first I thought the dealer installed the tires. After reading your post, I read the paperwork again last night and it seems the dealer hit the previous owner (leasing) with having to replace two rear tires and "one front tire to match existing front tire".

You are probably right about the tires and the dealer did not fix the issue.

Does not matter much.... hopefully I can still sell these tires...
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  #6  
Old 09-11-2018, 07:00 AM
Autoputzer Autoputzer is online now
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Location: NW Floriduh
 
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Mein Auto: 2014 535i + 2018 X3 30i
Low profile tires are hard to dismount without scratching the rim. Being RFT's makes it even more difficult. I had an E46 M3. They didn't make a mini-spare for it, so I carried a full size front tire (with a space and longer bolts for installing it on the back) in the trunk. It took up the whole trunk. I learned to live out of duffle bags on road trips. Having that spare saved me when I had a blow-out on one of those road trips, though. It was also handy when I had a puncture that only leaked slowly. I could install the spare, and take the flat tire in for service in my other car. I only let my BMW dealer, 95 miles away, do my tire work, even on my Chevy Cobalt. I wouldn't make that 95 mile trip in a car without a spare.

Removing and installing a tire without scratching up the rim is child's play if they use a lever-less machine... literally:

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  #7  
Old 09-11-2018, 10:20 AM
jtmat jtmat is offline
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Join Date: Jul 2018
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Mein Auto: 2015 435i Turbo Vert
Quote:
Originally Posted by Autoputzer View Post
Low profile tires are hard to dismount without scratching the rim. Being RFT's makes it even more difficult. I had an E46 M3. They didn't make a mini-spare for it, so I carried a full size front tire (with a space and longer bolts for installing it on the back) in the trunk. It took up the whole trunk. I learned to live out of duffle bags on road trips. Having that spare saved me when I had a blow-out on one of those road trips, though. It was also handy when I had a puncture that only leaked slowly. I could install the spare, and take the flat tire in for service in my other car. I only let my BMW dealer, 95 miles away, do my tire work, even on my Chevy Cobalt. I wouldn't make that 95 mile trip in a car without a spare.

Removing and installing a tire without scratching up the rim is child's play if they use a lever-less machine... literally:
Thanks for your posts...

After further research, I agree with you.

Took me a while to read wrap my head around what you were saying. I think it was this post that made me look further. I've never had low-profile tires or RFT before.

Again, thank you for being persistent... I learned something and you possibly saved me from a headache.

I actually agree also on the spare tire for long distance trips. When I'm around the DCMetro, I'm never far from a friend/family and they have 5 dealers in my area... and 1000s of tire shops (or so it seems).

Great info... site made a "newbie" feel welcome. Thank you again...

Answers to my questions...

) Should I keep the same size tire (255) on the front? No... going with 225s.

2) See #1.

3) See #1.

4) Does it matter where I get the tires put on? Going to a Mr Tire in my area.... they have touch-less with force road balance. Great reviews and they also work on a lot of BMWs (if their google reviews can be believed).
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  #8  
Old 10-12-2018, 08:00 PM
jtmat jtmat is offline
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Mein Auto: 2015 435i Turbo Vert
Finally had the non-run flats DWS06s installed... wow... now I have a BMW.

I'd read it changes the car for the better. I always thought my car drove like it did in corners because of the extra weight of the vert top (along with mechanics to make it work). It drives like a dream in corners now... The car feels so much better all around... no more loud thumps when going over small bumps in the road. The RFT were like driving with concrete tires.


I went with Mr. Tire... they still provided a small rash on the rear rim... guy said the tires were difficult to remove while he was working -- I was standing outside watching him every now and again. Not bad though... matter of fact, I won't even notice in my everyday. They quoted $129 to install but then only charged $88 when I got there.

One guy tried hard to talk me out of putting the DWS06s on my car... said I would live to regret it, he promised (short story, he was worried about a blow out and damaged rims). Anything can happen.... won't discount what he said. I appreciated the warning.

Now if I could fix the brakes.... they are so loud when stopping. I hate having the top down and stopping... m brakes are the worse noise I've ever heard on a car... unless they needed work. I'll take it back to the dealer even though they already said "that is the way BMWs are". Has anyone ever had the m-brakes removed? Maybe different pads? I honestly can't deal with the noise. I've already tried bedding the brakes, washing off the brake dust, etc... I've read a lot of threads. I drive at a quick clip so I warm them up...

Edit: oh, one big win with the new tires.... my speedometer (according to multiple apps and a street mph sign) is now correct.
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Last edited by jtmat; 10-12-2018 at 08:07 PM.
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