Makes me wonder why to put in a full size spare and make any modifications to the car... How often you need a spare? Once in a lifetime maybe? And in any case, the spare one, even if same size with other wheels, will not be equally worn compared to all other three remaining wheels under the car so you will be going to replace it (or two tyres) anyway 
I've used my spare three times this year
Having a full size spare enables me to continue working, carrying passengers in safety with no restrictions on tyre speed, which in turn means no impact on journey times
Let's say you've got a cab booked to take you to the airport but you've only left the bare minimum of time to get there, ie 20mins for a 20 mile journey. I turn up on time and you're not quite ready, suddenly I've got 15 mins to drive 20 miles. You then get in the car and the first thing that I say is: "Good morning, just to let you know that I had a puncture last night and have a space saver spare fitted. It's perfectly safe but I can only drive at a maximum of 50mph".
How pisst off will you be and how stupid do I then look 
But there is no limitation whatsoever for an genuine Omega spare wheel; you still can drive it up to 210 km/h as it is the very same tyre as was fitted in the factory to all basic spec Omegas. Speed limitations only apply to cars with "life-saver" spare wheels and it is required that they have stickers on them telling the limits.
This is where it gets interesting... I 100% agree that the tyres used on Omega stare wheels are normal tyres as fitted to basic spec Omega's and have the correct speed and load ratings to allow them to be used for normal driving. However, the wheels do have stickers on them warning to travel at a maximum of 50mph. This is also stated in the owners manual.
I can only conclude that the restrictions are there because of the imbalance of tyre performance across an axle with the spare fitted (ie. 235 on one side and 195 on the other).
Yes and no. Manual says limitation ONLY in case original tyre size is 235/45/17 in which case it is recommended to use it only as temporary. However, the wheel it self is the same so no tyre-related limitations, only due huge difference in width and rim size
edit: as I have never seen live an Omega from factory with 17" wheels I can not tell if they have some kind of a special spare wheel, my post is only based on 15" and 16" factory fit wheel cars and owners manual.
Actually you are right. All of the spare wheels I have that have the warning labels on, have come from elite or MV6 spec cars with factory 17" wheels. The spare I got from a 2.2 CD with factory 16" wheels had an identical spare, except no labels.
For reference, my own car is a 2003 Elite estate with factory 17" wheels, and the spare is a 15" steel with a 195 width tyre.
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Topic: Full size spare. (Read 3739 times)