Will a full size tire/wheel mount where a compact spare was on a 05 srx

The temporary spare is very narrow as will be the space available for storage. If you want an answer then I suggest you measure the storage compartment HEIGHT WIDTH AND LENGTH and come back and pose your question.
The first problem you will have is to get a wheel that will fit the car that is not too wide for the wheel storage area. If the available wheels are all too wide then you will will not be able to store a full size spare in the storage compartment. For that vehicle the available full size wheels in the correct bolt pattern will not be less than 6 or 6.5 inches wide.

if it came with a space saver tire chances are the compartment was designed for a smaller diameter wheel. measure the spare compartment hole diameter and height and then measure a full size tire the same way for your car, to see if it will fit. not likely though.

can be either option for full size when buying vehicle look at tire if looks different than what is on vehicle its a donut spare if looks like the other tires its a full

I had the same question and I finally did replace my tires with the same size and I am very happy with the results. The reason they are different sizes was to increase the performance of the SRX. I have 18" wheels and put on ( 245-60R-18 Michelin Lattitude) tires. The reason I selected this size was to minimize the speedo error to 1 mile per hour. I did that by going on line to a tire calculator and compare the original size to the replacement I selected. Now, depending on your rim size you might find that you may have to select a different tire then I. The rule is to keep the spreedo error under 3 MPH. The ride quality was greatly improved with my selection.

If the vehicle came with a spare tire then yes you can use it. As to whether or not it is a full size spare tire I wouldn't be able to answer that, as on some models a full sized spare is an option and I have no way of knowing if that option was purchased or not.

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Hello, If you will check on the drivers door fram there should be a placard telling you the size and pressure and if I'm correct they should be directional tires. Yes I would take it back to the dealer. Cadillac recommends the proper tires for thi car

Full size- 35psi Mini-compact spare- It should be marked on the side of the tire. If you can't find a pressure, fill it to 50psi.

Hello.

Do you have a full-size spare tire? If so, it too is checked via the Tire Pressure Warning System. Perhaps it is low, this is quite commonly omitted when setting tire pressures. If you have a temporary spare tire, it is not checked. If you have no full-size spare, one of the TWPS sensors may have been damaged by your tire changer. This can happen very easily, if the changer is not careful whilst dis-mounting the tires. A Toyota dealership has a special service tool that will check each of the sensors for output, while on the car. If a sensor is found to be bad, the tester will find it.

If I understand you correctly, you are requesting a tire size which will fit on your original temporary spare rim?

This should not be done, as it may not be safe. You can replace your spare tire with a full size version that would normally be found on your vehicle, though. No harm will come of that.