With tire sizing it's real simple. Example (215/40-15)
1st number is the width of the tire
2nd number is the side aspect ratio
3rd number is the diameter of the wheel
The letter is the speed rating
Some tires like slicks are measure differently. Example (26/10-15)
1st number is tire height
2nd number is tire width
3rd number is the wheel diameter
To answer your question no the difference in size from the 205 to 215 is minimal so you are fine technically you will have a slightly wider tire patch which equals more traction.
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