Can you use 215 60r16 instead 205 55R16?
Yes, that smaller size should work and yes, your speedo will read a bit higher than it should due to the smaller diameter of the tires.
Can I use 205 65R16 instead of 205 55R16?
Properly, no. A 205/65R16 sized tire has a much taller sidewall compared to a 205/55R16 tire. If you used the taller sidewall tire you would very much lessen the handing, stability and control of your vehicle. In fact, you’d be all over the road.
Will 215 60r16 fit on 215 55R16?
You would have 10.75mm of extra rubber on top and bottom, which would make each tire 21.5mm taller overall, which comes out to about 0.85 inches. So – yes they will fit on your wheels. I do not know if they would fit in the wheel wells without scrubbing, but my guess is that there’s a good chance they would fit.