Iveco speed problem

[stixo]

Hi. I have problem in iveco daily. speed is different from the gps around 13km/h. ex. i have 60 km/h gps is 72km/h. the faster the bigger the difference. someone will help?

[Klaudas1331]

Speed may differ because of tyre size. Do you use the manufacturer recommended Tyre size, height, width?

[stixo]

I have 185/75 r16

[greyg]

Rear axle ratio problem. Year of prod. Daily?