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SpareTire

I'm thinking of heading down to a local "Pick and Pull" with a tape measure and search the trunks of GMs for a spare donut. If I don't find anything I'll buy new.
Maybe runflats are the answer
The thought of my wife driving her often dark commute with only a can of fix a flat and a compressor is very concerning.
So you would prefer her out trying to change tire herself or flag down some stranger to help her, rather then call free GM service to rescue her?
 
So you would prefer her out trying to change tire herself or flag down some stranger to help her, rather then call free GM service to rescue her?
Agreed, call GM service. But they will not have a spare tire to mount.
 
Agreed, call GM service. But they will not have a spare tire to mount.
I am sure they will take car to have tire repaired, if they do not have a plug or sealant to put in it.
 
If you guys want a spare that's very close to the regular tire diameter, I bought a 165/80-17 Yokohama tire from Tire Rack and had it mounted on a junkyard 17x4 Buick donut rim. The resulting donut is a very close match to the 235/50-18 at 0.4% larger, it fits and drives fine, the tall sidewall is great over potholes and the load capacity is actually higher than our full size tires. And for ~$122 delivered it's not expensive, plus it has a speed rating of 81 mph so you're not limited to 50.
The downsides: it won't fit in the stock spare well and the tread is noisier at highway speed.
https://www.tirerack.com/tires/Tire...7&rearWidth=255/&rearRatio=40&rearDiameter=17

Agree that a spare very close to the OEM diameter of 27.25" is far superior, especially since I drive out West where you might need to drive 100 miles to get a flat tire fixed. A small diameter will create a lot of spinning in the differential. Not good. I see there is a 17x4.5" rim available. Do you have a part number on the 4" rim you used? Or car it came from?
 
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Agree that a spare very close to the OEM diameter of 27.25" is far superior, especially since I drive out West where you might need to drive 100 miles to get a flat tire fixed. A small diameter will create a lot of spinning in the differential. Not good. I see there is a 17x4.5" rim available. Do you have a part number on the 4" rim you used? Or car it came from?

I don’t remember, sorry. But I looked at the rim, and this is what’s stamped into it:

FUMAGALLI F2133 05 12 30 T DOT made in Brazil 17X4 DHB
 
Agree that a spare very close to the OEM diameter of 27.25" is far superior, especially since I drive out West where you might need to drive 100 miles to get a flat tire fixed. A small diameter will create a lot of spinning in the differential. Not good. I see there is a 17x4.5" rim available. Do you have a part number on the 4" rim you used? Or car it came from?

I don't unfortunately, but here's what is stamped into the rim that I have:

FUMAGALLI F2133 05 12 30 T DOT made in brazil DHB 17X4T
 
Hello all, I have read almost all of the post on here in regards to the spare tire issue. Having a spare tire is important to me. I may never use it, I also have AAA, but you never know when the time comes and you wish you had a spare.
I ordered the jack from GM- part #23455285, I bought a 19mm ratcheting wrench, bought a gorilla breaker bar, that comes with the necessary accessories to remove the lug nuts. Now here is where things got tricky. I read that the spare from a DTS 2005 gen will work. I bought one for $50 and it came with a brand new, never used conti tire. 125/70/17. I installed the rim on the front, dropped the car down, and it rubbed on the caliper. So this did not work. Im sure it fits the back just fine, but not the front. So I bought a spare from a 2018 Equinox, same as a 2018 Impala part #560-08121 or cross reference 84095141, tire size 125/70/17. Just got it today, paid $80 shipped. It worked perfect. Drove the car up and down the street, no issues. The tire is much thinner and obviously lower than stock, so the car does lean. But its a spare, so im figuring 20-25 miles driving to get to a safer or better area, or off the highway its perfect. I had more than enough room to put the jack and the other tools in the spare tire wheel well. And the sub fits perfectly just like factory.
I hope this helps someone out.
 
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Hello all, I have read almost all of the post on here in regards to the spare tire issue. Having a spare tire is important to me. I may never use it, I also have AAA, but you never know when the time comes and you wish you had a spare.
I ordered the jack from GM- part #23455285, I bought a 19mm ratcheting wrench, bought a gorilla breaker bar, that comes with the necessary accessories to remove the lug nuts. Now here is where things got tricky. I read that the spare from a DTS 2005 gen will work. I bought one for $50 and it came with a brand new, never used conti tire. 125/70/17. I installed the rim on the front, dropped the car down, and it rubbed on the caliper. So this did not work. Im sure it fits the back just fine, but not the front. So I bought a spare from a 2018 Equinox, same as a 2018 Impala part #560-08121 or cross reference 84095141, tire size 125/70/17. Just got it today, paid $80 shipped. It worked perfect. Drove the car up and down the street, no issues. The tire is much thinner and obviously lower than stock, so the car does lean. But its a spare, so im figuring 20-25 miles driving to get to a safer or better area, or off the highway its perfect. I had more than enough room to put the jack and the other tools in the spare tire wheel well. And the sub fits perfectly just like factory.
I hope this helps someone out.
I just had a blowout, non-repairable on our 2019 TourX. I also have a 2012 Equinox with the factory 145/70/17 and if you remove the subwoofer it will fit in the spare tire space by slipping the spare at an angle under the front floor reinforcement and it sits down. Only problem is the center hole is 1/8" too small for the Buick hubs and it has 5x120 bolt spacing. The wheel could be modified by grinding the stud hole towards the center 1/8" and grind the center hub 1/8" larger diameter. The reduced stength of the wheel mounting would not bother me to drive at 50 mph for 50-100 miles to a tire store.
I searched for the 2018 Equinox/ Impala on eBay and they were all 125/70/16 (NOT 17) and bolt spacing is the same but not sure of center hub diameter. If the 16" was too small for the front, just put the spare on the rear and the rear on the front since the rear caliper is much smaller.
 
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I just had a blowout, non-repairable on our 2019 TourX. I also have a 2012 Equinox with the factory 145/70/17 and if you remove the subwoofer it will fit in the spare tire space by slipping the spare at an angle under the front floor reinforcement and it sits down. Only problem is the center hole is 1/8" too small for the Buick hubs and it has 5x120 bolt spacing. The wheel could be modified by grinding the stud hole towards the center 1/8" and grind the center hub 1/8" larger diameter. The reduced stength of the wheel mounting would not bother me to drive at 50 mph for 50-100 miles to a tire store.
I searched for the 2018 Equinox/ Impala on eBay and they were all 125/70/16 (NOT 17) and bolt spacing is the same but not sure of center hub diameter. If the 16" was too small for the front, just put the spare on the rear and the rear on the front since the rear caliper is much smaller.
Get the proper sized Cadillac spare so you don’t have to grind out your equinox spare. Not only are you weakening the wheel, you are giving it a place to rust
 
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Don't Buick sell the space saver spare as an option? It was standard fit or an option on all models in New Zealand (and I expect Australia) except the VXR. Even then I'm guessing it would work on the VXR providing only it was fitted to the rear wheels, which would mean a three way swap if you had a flat on the front.
 
Don't Buick sell the space saver spare as an option? It was standard fit or an option on all models in New Zealand (and I expect Australia) except the VXR. Even then I'm guessing it would work on the VXR providing only it was fitted to the rear wheels, which would mean a three way swap if you had a flat on the front.
I don't know if it was an option in the traditional sense like you spec it. I think maybe it was available on some of the basic models / trim levels, maybe fleet cars, but that is a guess. GM lists part number for the spare wheel as 84095141. The wheel fits several other cars and is pretty readily available from scrapped cars. 2017-2020 GM Spare Tire 84095141 | GMPartsDirect.com
 
...If the 16" was too small for the front, just put the spare on the rear and the rear on the front since the rear caliper is much smaller.

...it would work ...providing only it was fitted to the rear wheels, which would mean a three way swap if you had a flat on the front.
my thinking is that whatever distance you have to drive on that spare you would want the full size wheel/tire on the front,
so putting the spare on the rear & then moving the good rear one to the front (if the flat had happened up front) would be the best scenario anyways
🤔
 
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my thinking is that whatever distance you have to drive on that spare you would want the full size wheel/tire on the front,
so putting the spare on the rear & then moving the good rear one to the front (if the flat had happened up front) would be the best scenario anyways
🤔
Since my car is AWD, I think driving any distance with a donut might be bad for the AWD system since one of the wheels will undoubtedly be significantly smaller than the other 3. If only there were a button to switch to FWD or RWD, then I’d feel comfortable using a donut spare
 
Since my car is AWD, I think driving any distance with a donut might be bad for the AWD system since one of the wheels will undoubtedly be significantly smaller than the other 3. If only there were a button to switch to FWD or RWD, then I’d feel comfortable using a donut spare
The space saver is optioned here for the AWD models so I don't think it's smaller size is a problem. Having said that, I'm not even sure the one they supply is a smaller diameter, it may be just a narrower rim and tyre.
 
The space saver is optioned here for the AWD models so I don't think it's smaller size is a problem. Having said that, I'm not even sure the one they supply is a smaller diameter, it may be just a narrower rim and tyre.
Thanks for the tip. I will go measure my CTS spare to see how closely it matches the TourX tires/wheels. I would feel much better if the donut was indeed the same diameter.
 
Just because I’m lazy this morning, can someone please list the tire/rim size for the Cadillac spare that fits in the spare tire well with the Bose sub? Could you also post the years and models that have that spare? Since I recently had a flat, getting a spare is now a higher priority and I’d like to hit the local junkyards this weekend.
 
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Just because I’m lazy this morning, can someone please list the tire/rim size for the Cadillac spare that fits in the spare tire well with the Bose sub? Could you also post the years and models that have that spare? Since I recently had a flat, getting a spare is now a higher priority and I’d like to hit the local junkyards this weekend.
Post number 1 in this thread give you the size. Link in post number 71 gives you the fitment of the OEM wheel to other cars the wheel fits. Actual list is larger since there are other wheel part numbers that fit.
 
Post number 1 in this thread give you the size. Link in post number 71 gives you the fitment of the OEM wheel to other cars the wheel fits. Actual list is larger since there are other wheel part numbers that fit.
Thanks for that info. Do you know of any other older cars besides the 2006 Lucerne and 2006-2011 Cadillac DTS with that spare? There probably aren’t too many 2017-2020 cars at the junkyard. Seems like I remember there was also a 5-spoke spare that would fit.
 
I found this great info.
Give this Hollander Interchange number to your favorite junkyard, they should have the wheel complete with the tire.

Hollander: 8121 Size: 17x4, 5 lug, 115mm​

Applications:
EQUINOX 18-20 17x4 (opt 4GO) LACROSSE 17-19 17x4 (compact spare) REGAL 18-19 17x4 (compact spare)
REGAL 20 17x4 (opt RV9 Spare Wheel) TERRAIN 18-20 17x4 (opt 4GO)
Notes: GM 84095141 Ident: AB5 Compact spare
 
Since my car is AWD, I think driving any distance with a donut might be bad for the AWD system since one of the wheels will undoubtedly be significantly smaller than the other 3. If only there were a button to switch to FWD or RWD, then I’d feel comfortable using a donut spare
The computer is smart enough to know when a smaller tire is installed (i.e. a spare) and will disable AWD.
 
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