175/65R14 VS. 175/70R14

[Stustu07]

Hi guys, my name is Stuart. So I'm no stranger to forums, I did some searching and didn't come up with anything that directly answered my questions. I'm asking these questions on behalf of my girlfriend. So she has a 2007 manual 4-door Hatch (Canadian Car), that currently has 175/65R14's on the car. I wanted to know how much of a change would there be on the speedo if she changed to 175/70R14's. She's staying with a 14" steely as these are for winter driving (better in snow compared to 15's), and she wants a nicer ride feel. I know 14's ride nicer than 15's comfort wise (depends the person and other suspension components). The reason I'm asking is because I have really no idea how changing tire sizes effects the Yaris.. I know on my car I have 2 speedo gears, one on the trans and one on the actual speedo; changing tire sizes if not done correctly would cause me to have to change 1 of the 2 gears to get the right reading on the speedo. All help/info is appreciated, thanks!

(Btw I use this site when comparing tire size changes tire size comparing site)