gear ratio

[berg]

Hello from Holland,

Do I have to chanche the gear ratio when I am installing bigger tires. 254x75x16 instead of the original 235x70x16. I own a 2006 CRD automatic 65 anniversery

 

[LibertyOrDeath]

I am assuming you mean 245/75R16. If so you don't have to change gear ratios; however, you should notice a drop in acceleration with bigger tires unless you lower the gear ratio. Might consider upgrading the brakes too.