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Technical Topics Wheels and Tires M340i ZTK spare

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      04-28-2019, 12:04 AM   #1
OldOne
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M340i ZTK spare

As you might now, the M340i cars optioned with ZTK do not come with the space saver spare, as the 18" donut that comes with the lesser G20s does not fit over the larger brakes that come with the ZTK package. Well, guess what: Audi makes a 19" spare in the same 5x112mm bolt pattern with the same 66.6mm bore diameter, with the correct rolling diameter. This is the A4/S4/A5 spare, 125x70R19 tire on a 19x4" wheel. It bolts right up, fits over the brakes, but touches the front of the fat caliper. A 15mm spacer to the rescue! Problem solved.

And you don't lose a lot of usable trunk space either, as you can actually fit stuff like grocery bags inside the spare, lol...
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      05-08-2019, 08:04 AM   #2
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Quote:
Originally Posted by OldOne View Post
As you might now, the M340i cars optioned with ZTK do not come with the space saver spare, as the 18" donut that comes with the lesser G20s does not fit over the larger brakes that come with the ZTK package. Well, guess what: Audi makes a 19" spare in the same 5x112mm bolt pattern with the same 66.6mm bore diameter, with the correct rolling diameter. This is the A4/S4/A5 spare, 125x70R19 tire on a 19x4" wheel. It bolts right up, fits over the brakes, but touches the front of the fat caliper. A 15mm spacer to the rescue! Problem solved.
Appreciate the info. Just got the same wheel. What spacer did you use?
Is it hub centric?
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      05-08-2019, 08:19 AM   #3
Ilyam5
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Also - what do you think is the widest tire to fit on the front?
can we use square set up with 255? or will it hit at full lock?

maybe 245 max.

It will help for the winter package as well
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      05-09-2019, 10:37 AM   #4
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These are the spacers I got:

https://www.ebay.com/itm/Pair-Of-15m...53.m2749.l2649

Hubcentric, comes with the correct length bolts, everything seems to be of decent quality.

Yes looks like square 255 setup is possible. I actually tried test fitting one rear wheel up front, and it touches the strut as is. With the same 15mm spacer, it bots on fine, with around 9mm of strut clearance measured at the closest point with the car jacked up. With the car dropped to the ground, I'd say it sticks out a little bit too much. Doesn't appear to be rubbing anywhere at full lock. I didn't drive around like this though. This is a 19x8.5 ET40 wheel, so a 15mm spacer effectively makes it ET25. I think ET30 (or a 10mm spacer) would be ideal. But you never know till you try...
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      05-09-2019, 01:23 PM   #5
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Great info. Thank you. got the spacers as well.

I have regular scissor jack i drive around and a tire plug kit. What jack are you using?
As for tires and wheels-

I,m thinking of Toyo tires for track

PROXES R888R - SIZE: 245/35ZR19 - which i think will fit just fine even on stock rims

But I would like to find a set of wheels that are not too expensive (300 a piece max) and i can use them for winters as well.
I used Apex wheels on my M3 but they do not have 5x112 yet.

Also what have you done to cover the radiator? I have bought the mesh from Lowes and was able to fabricate the cover.
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      05-11-2019, 07:48 AM   #6
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Quote:
Originally Posted by Ilyam5 View Post
Great info. Thank you. got the spacers as well.

I have regular scissor jack i drive around and a tire plug kit. What jack are you using?
As for tires and wheels-

I,m thinking of Toyo tires for track

PROXES R888R - SIZE: 245/35ZR19 - which i think will fit just fine even on stock rims

But I would like to find a set of wheels that are not too expensive (300 a piece max) and i can use them for winters as well.
I used Apex wheels on my M3 but they do not have 5x112 yet.

Also what have you done to cover the radiator? I have bought the mesh from Lowes and was able to fabricate the cover.
I'm using a Duralast aluminum floor jack from Autozone.

https://www.autozone.com/engine-and-...ack/410338_0_0

Inexpensive and works. Makes swapping wheels in your garage a breeze and is light enough to take it to track events. OEM BMW toolkit with a scissor jack in the trunk.

Yep I'm going to be needing 2 sets of wheels myself: one for the track, one for the winter. Researching the available wheel options in 19x8" and 19x8.5" right now. To be continued...

Haven't done anything about the radiator, actually... Could you share more details on your cover?
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      05-11-2019, 12:59 PM   #7
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Quote:
Originally Posted by OldOne View Post
I'm using a Duralast aluminum floor jack from Autozone.

https://www.autozone.com/engine-and-...ack/410338_0_0

Inexpensive and works. Makes swapping wheels in your garage a breeze and is light enough to take it to track events. OEM BMW toolkit with a scissor jack in the trunk.

Yep I'm going to be needing 2 sets of wheels myself: one for the track, one for the winter. Researching the available wheel options in 19x8" and 19x8.5" right now. To be continued...

Haven't done anything about the radiator, actually... Could you share more details on your cover?
Got a metal mesh from Lowes. bend it and attached to bottom.

Called IND - they do not have one fro 340 but are looking into it.

So mesh is working fine for now.
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      05-13-2019, 03:30 PM   #8
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here is the pic again
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