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MikeJXE

Then place an order online with Suzuki,  get the info you need and cancel 

Ayr_Rage

Download the full vehicle manual and the size should be listed in there even if your own vehicle came with a can of gunk and a pump.

fatbelly

What's the tyre size on the car?

What size is the space saver?

facade

Space savers are comedy sized. They are an emergency measure to get you to a tyre repairers (at low speed). They shouldn't be fitted at the front as the massive difference in tread will cause issues with hard braking.

Anyway, the recommended spacesaver is nothing like the original diameter, it only has to go on the hub without fouling the brakes or anything and fit in the tiny space in the boot. (you can't store the original in that space, so leave extra room in the boot for it )

As suggested, the tyre size for the spacesaver ought to be in the driver's handbook for the car.

(As an aside, some spacesavers come with shorter bolts as using the original bolts with the thin wheel damages the hub Mercedes A class was one example)

SiliconChip

Surely the sensible way to proceed is tell us exactly what vehicle it is and then hopefully somebody can give you the answer.

Ayr_Rage

If the vehicle only gets gunk the abbreviated locally supplied handbook may not have the details, try a download from the manufacturer, I found a lot more info for my vehicle that way.

facade

The 125 will be 4.7% under diameter, which should be fine on the back (of a 2wd), the 115 will be 7% under diameter, it might be ok on the back. If it was a choice between fitting the 115 or walking 10 miles/waiting 2 hours for breakdown I'd put it on the back- there is no traction control to get upset.

https://www.tacomaworld.com/tirecalc?tires=185-55r16-115-70r16

Post on a suzuki swift forum, and see if someone has the correct wheel for the 185/55 R16 and can tell you the size. The 4wd is different to the 2wd

Willberry

I'm on my second Suzuki Swift. The spacesaver which I purchased from the dealer is 135/70/R15. The tyre pressure is 60 psi. I also purchased a bracket which fits inside the rear offside wing to hold the jack rather than have it bouncing about in the back. Hope this helps. 

facade

A 145/70 R16 would be pretty much spot on the diameter, but I don't think they are available.

A 135/70 R16 would be within 2.5%, but I bet it won't fit in the space- If it did you could just get the proper wheel & tyre for the car as a spare in the first place, then you wouldn't be limited to 50mph and could just swap the puncture out, no shuffling to get the spare on the back.

The spacesaver for my woeful Renault Nissan is ridiculously small compared to the proper tyre, I got a proper spare and the only way it fits in the spare wheel space is with the tyre deflated. Yes it is deeper, but that isn't a problem.

I'd just use the one you have- it will probably never need to be fitted.