Hi all,I have a 2005 octavia 4x4 running on 15" rims,would it do any harm to put 16s on it,I know it will knock the speedo out a bit but didn't know if it would affect anything else.

Nope. Should be fine. Mines on 16" and the scout gets 17". Perhaps find someone to reset speedo calibration with VCDS?

provided the tyre has the same rolling radius it won't put your speedo out.

Agree with rob_e on that front.

Google tyre size calculator, there's loads out there.

For starters....

195/65/15 = 205/55/16

Thanks for your help and info guys,much appreciated.

I run 205/55/16 with winter tyres and the standard 205/60/15 in summer without issue on my 4x4.