I haven't come across any thief, who keeps spare tire with him, and takes two minutes only to remove the nuts of the tyre rim and tyre and then put the other tyre, fix the nuts again and off he goes. It will definitely take him some time and thieves normally prefer looking for easy prays, as they don't have enough time risking to remove the tyre, and put other one. I agree that not every security is full proof, that's why I have bought the clutch pedal lock as well to use it in combination with grip wheel lock. Check Amazon and you will be amazed to see users giving this product 4.5 stars out of 5 stars.