Tyre Question ?

[killie77]

Hi
Purchased a set of second hand Citroen Alloys for the Berlingo. they are 16 inch the tyres on these are 205 55 R16 
The ones they are replacing are the original 15 inch Steel wheels with tyres were 205 65 R15
Im wondering if the slight difference in height and profile will affect the speedo ?
Thanks for any info
Ian

[Sol]

Hi there, use this site to check, put originals in box 1 and new wheels in box 2, click calculate. Your new wheels actually are 2.4% smaller overall circumference than the old ones so your Speedo will read high by that amount. At indicated 30mph you'll be doing 29.3mph.

https://tiresize.com/tyre-size-calculator/

[killie77]

Thanks
Will give it a go.
Ian