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  #1  
Old 11-28-2018, 08:14 AM
Coconutpete Coconutpete is offline
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Is anyone using a 125/80/16 spare?

Well, the stock size 125/90/15 tire seems to be extinct. You can go without spare, put on your 17 year old donut and cross your fingers, or buy another (old) one off eBay and THEN cross yoru fingers.

BMW part # 36116750006 is for a 16" rim and with the Kumho spare tire in size 125/80/16, that lands the dimensions about as close to identical as possible.

After inspecting my donut. I'm not going to put it back in!

I'm thinking about pulling the trigger on this setup. Is anyone running it?

125/90/15
Diameter: 23.9"
Width: 4.9"
Sidewall: 4.9"
Circumference: 74.9"
Revs/Mile: 846


Replace with: 125/80/16
Diameter: 23.9"
Width: 4.9"
Sidewall: 3.9"
Circum: 75"
Revs/Mile: 845
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  #2  
Old 11-28-2018, 12:46 PM
zed3coupe zed3coupe is offline
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Just go without a spare. Had a spare on my Z3 3.0 and never used it. Now have a M coupe with no spare. Doesn't really stress me out, just add towing on your insurance policy or get AAA.

I like your "Zeds Dead" tagline! I have a euro plate with that!
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Old 11-28-2018, 01:56 PM
Coconutpete Coconutpete is offline
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Quote:
Originally Posted by zed3coupe View Post
Just go without a spare. Had a spare on my Z3 3.0 and never used it. Now have a M coupe with no spare. Doesn't really stress me out, just add towing on your insurance policy or get AAA.

I like your "Zeds Dead" tagline! I have a euro plate with that!
In "6 to 8 weeks" I'll have a U.S. vanity plate with it :-D
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  #4  
Old 11-28-2018, 02:44 PM
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vintage42 vintage42 is offline
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Mein Auto: 1997 BMW Z3 1.9 5MT
Quote:
Originally Posted by Coconutpete View Post
... the stock size 125/90/15 tire seems to be extinct... BMW part # 36116750006 is for a 16" rim and with the Kumho spare tire in size 125/80/16, that lands the dimensions about as close to identical as possible... Is anyone running it?
125/90/15
Diameter: 23.9"
Width: 4.9"
Sidewall: 4.9"
Circumference: 74.9"
Replace with: 125/80/16
Diameter: 23.9"
Width: 4.9"
Sidewall: 3.9"
Circum: 75"
I did not know such a perfect replacement was available. Or heard of anyone using it. I assume the BMW part # means the wheel fits on the Z3 hub.

My original donut was like new, but I bought one of the last new donuts and mounted it. Old donut is for sale, and looks absolutely fresh and new.

Continental T125/90R15 compact spare tire. The tire is from a 1997 BMW Z3 that I bought in 2013 with 32,000 miles. The car (and tire) had evidently been garaged all its life. Tire is in new condition and has never been used. Except for the date of manufacture on it, this tire cannot be told from a new tire made in 2010 that I bought in 2013 to replace it. Both have the same whitish waxy preservative coating that I was unable to completely rub off of either tire; some residue remains around some lettering. Price: $75, including shipping to continental US.
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  #5  
Old 11-29-2018, 06:02 AM
Coconutpete Coconutpete is offline
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My tire "looks" ok as well, but if you get all up close n' personal with it, you can tell it's 18 years old. Doesn't really make me want to rush to put it back on.

In order to get some "order" back in the workshop I did put air in it last night and put it back in. Once I"m done w/ the stereo install I'll check it again and see if it holds air.
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Old 11-29-2018, 09:21 AM
ZEEBOY ZEEBOY is offline
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Guess I'm scratching my head on this one...if it's a spare tire you typically only drive it 5/10 miles until you can get your regular tire repaired/replaced. I check my spare tire pressure a couple times a year and add accordingly. Although it is good to be pro active on new rubber I guess....btw....am I the only one who does not understand the significance of Zeds Dead??
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Old 11-29-2018, 10:54 AM
leiniedude leiniedude is offline
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Kind of new here, so I would like to be in on the joke also ZEEBOY.
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  #8  
Old 11-29-2018, 10:58 AM
zed3coupe zed3coupe is offline
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Quote:
Originally Posted by Coconutpete View Post
In "6 to 8 weeks" I'll have a U.S. vanity plate with it :-D
Nice! yeah I still need to get plates on the M. Been contemplating getting vanity plates.
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  #9  
Old 12-10-2018, 05:08 PM
WANGDM WANGDM is offline
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Follow up report...

Bought a wheel from Pelican Parts ($52) and tire from Discount Tire ($120 including various fees and charges). The good news: the new spare fits in the "tub." The bad news: It just barely, and I mean barely, fits. I'm going to carry a pry tool of some sort because once the new tire is snugly in the tub it does not want to come out with out substantial help. Would not be fun on a dark and stormy night in the middle of nowhere albeit better than a flat tire and an 18 year old spare that pops when you try to use it...

Bottom line: If I could find an exact replacement for the original tire I'd go that route. However, a fair amount of searching on my own and by a local tire dealer failed to turn up any orginal size tires. If you want a spare (I do), the Kumho T 125/80 D16 97M will work for you.
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  #10  
Old 12-10-2018, 06:26 PM
Blacklane Blacklane is online now
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Thanks for sharing that.
Maybe if you let the air out, it would fit better...

Last edited by Blacklane; 12-11-2018 at 07:45 PM.
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  #11  
Old 12-11-2018, 05:55 AM
Coconutpete Coconutpete is offline
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Location: Charlotte, NC / Denmark
 
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Quote:
Originally Posted by WANGDM View Post
Follow up report...

Bought a wheel from Pelican Parts ($52) and tire from Discount Tire ($120 including various fees and charges). The good news: the new spare fits in the "tub." The bad news: It just barely, and I mean barely, fits. I'm going to carry a pry tool of some sort because once the new tire is snugly in the tub it does not want to come out with out substantial help. Would not be fun on a dark and stormy night in the middle of nowhere albeit better than a flat tire and an 18 year old spare that pops when you try to use it...

Bottom line: If I could find an exact replacement for the original tire I'd go that route. However, a fair amount of searching on my own and by a local tire dealer failed to turn up any orginal size tires. If you want a spare (I do), the Kumho T 125/80 D16 97M will work for you.
Nice follow up! Thank you.

I (like you) want to have some sort of spare. Based on your report I think I'm actually OK proceeding with this. If it's a dark and stormy night on the side of the road, I'll call AAA. If it's daytime and there's a parking lot nearby, I'll change it - so I'm OK using this method.


Quote:
Originally Posted by ZEEBOY View Post
Guess I'm scratching my head on this one...if it's a spare tire you typically only drive it 5/10 miles until you can get your regular tire repaired/replaced. I check my spare tire pressure a couple times a year and add accordingly. Although it is good to be pro active on new rubber I guess....btw....am I the only one who does not understand the significance of Zeds Dead??
It's from a great movie called Pulp Fiction. Younger members may not have seen it.

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Last edited by Coconutpete; 12-11-2018 at 05:56 AM.
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  #12  
Old 12-11-2018, 08:19 PM
ptony101 ptony101 is offline
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Location: Central CT
 
Join Date: Mar 2010
Posts: 9
Mein Auto: 2006 328xi
Quote:
Originally Posted by WANGDM View Post
Follow up report...

Bought a wheel from Pelican Parts ($52) and tire from Discount Tire ($120 including various fees and charges). The good news: the new spare fits in the "tub." The bad news: It just barely, and I mean barely, fits. I'm going to carry a pry tool of some sort because once the new tire is snugly in the tub it does not want to come out with out substantial help. Would not be fun on a dark and stormy night in the middle of nowhere albeit better than a flat tire and an 18 year old spare that pops when you try to use it...

Bottom line: If I could find an exact replacement for the original tire I'd go that route. However, a fair amount of searching on my own and by a local tire dealer failed to turn up any orginal size tires. If you want a spare (I do), the Kumho T 125/80 D16 97M will work for you.
Thanks for this feedback. I've been thinking about this too. Can you elaborate on why it was so snug in the tub? The diameter and thickness are the same so it seems like it should have fit the same as with the original 15" setup.

In my case, 2001 2.5, the spare is already on a 16" rim (115/90-16). If I put a 125/80 on, the diameter is smaller (23.9 vs 24.1) but thicker (4.9 vs 4.5).
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  #13  
Old 12-11-2018, 08:50 PM
WANGDM WANGDM is offline
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Mein Auto: 2002 Z3 3.0
Overall diameter is the issue rather than "thickness." As noted in earlier post, the new spare fits but is really tight in the tub. Reducing air pressure could help but then I'd need a 12 volt pump or some kind of compressed air sealant to bring the tire back up to a usable pressure. Either alternative is not much different than using a plug to fix a flat and then pumping the tire back up to pressure (which is what I'd have to do on my 911 but that's another story).

Not sure it makes any difference but my Z3 is a late production (May 2002) 3.0. I'm the original owner.
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  #14  
Old 12-12-2018, 06:21 AM
Coconutpete Coconutpete is offline
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It's odd how they put a 16" rim on the later models with a 115/90-16 tire on it when a 125/80/16 tire would be closer to the dimensions of the original earlier Z3 spare.
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  #15  
Old 06-17-2019, 08:14 PM
ptony101 ptony101 is offline
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So, I pulled the trigger on the Kumho 125/80-16. Yes, it's tight in the tub; I'm thinking it must be due to the pressure. Shop inflated it to spec 60psi. I'm sure my old spare was in the 30's. Anyway, the tub is very flexible so it jammed in okay.

Since my wheel was already 16", I only needed the tire. Got it on Amazon for $60-ish. $25 for mounting at my local shop. I feel better.
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  #16  
Old 06-18-2019, 07:25 PM
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CarterTG CarterTG is offline
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Direction of this thread is making me wonder out loud...

Recalling one of the monthly sermons given by the local BMWCCA eons ago, TireRack had mentioned they offered a tire-shaving service for track folk.

https://www.tirerack.com/tires/tiret...&affiliate=TX3

Looking at their site, this is apparently still being offered where the factory tread depth is cut from 10/32" to 4/32". Might this be enough to alleviate some of the snugness?
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  #17  
Old 06-19-2019, 06:42 AM
caricamento caricamento is offline
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Guess I'm a little late, but I have l have a
T125/80D-15 KUMHO SPARE TIRE T121 from Tire Rack per the suggestions of my tire guy. It's definitely tight but it seems good. Haven't had to use it, thankfully.
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  #18  
Old 06-19-2019, 04:53 PM
ptony101 ptony101 is offline
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Location: Central CT
 
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Quote:
Originally Posted by CarterTG View Post
Direction of this thread is making me wonder out loud...

Recalling one of the monthly sermons given by the local BMWCCA eons ago, TireRack had mentioned they offered a tire-shaving service for track folk.

https://www.tirerack.com/tires/tiret...&affiliate=TX3

Looking at their site, this is apparently still being offered where the factory tread depth is cut from 10/32" to 4/32". Might this be enough to alleviate some of the snugness?
I've got to believe it's due to the higher pressure in the new spare. Spec wise, it has a smaller diameter (very close, but smaller) so it shouldn't be that. That said, even though it's tight, the tub is very flexible so it isn't much of an issue IMHO. I don't think it's worth having it shaved down. Just my opinion.
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