[Jetcab]

I just bought new tires for my 2001 PT Limited Edition.
Michelin MXV4 PLUS XSE All season performance 215/55HR16 93H.
(It came with 205/55HR16)
The car handles better, however the speed now does a funny movement now, when I speed up the speedometer arm goes to what seems the proper speed read out, then when I slow down the speedometer drops dramtically down. I was told as long as I didn't change the height of the tire I wouldn't have any issues with the speedometer. Is that's what going on...the tires are 215 rather than 205's...?

Thank you for your help.
Jetcab