P80 1998 1999 2000 DIM CDM calibration for tire/wheel size possible

Post by **abscate** » 23 Jan 2026, 02:34

I’ve got a couple sets of 15 inch and 16 inch wheels and rubber, can I graduate ftom a post it note onthe dash with new Speedo calibrations somehow? Is there a VIDA adjustment possible ?

Written wearing a 75 pound Labra-Dane lying on me, bonding after a business trip

Post by **scot850** » 23 Jan 2026, 08:33

Why are you needing to calibrate the speedo? With the correct tires, the speed would be the same as they would have the same rolling circumference.

15" wheels (been a while since I used those) had something like a 195/60/15 tire (I may be wrong and winters had a 185mm recommended), but I ran up to a 205.

16" is where Volvo made a change to the tire recommendation after a number of complaints of sidewall damage and changed the tire from a 50 to a 55 profile tire. No speedo calibration change was made.

The other issue is people using tires for a V70 XC on a standard V/S70 which had a taller sidewall. That will throw off the calibration a bit. There are several websites that you may be aware of that compare tires and the affect on indicated speeds. This website also lists variants for P80's:

https://www.wheel-size.com/size/volvo/v70/1998/

Neil

454cid · Post by **454cid** » 23 Jan 2026, 08:49

scot850 wrote: ↑23 Jan 2026, 08:33 Why are you needing to calibrate the speedo? With the correct tires....

I think that's the issue. The tires aren't the OEM size for the car, but he's wanting to use them up without having to remember his speedometer is a bit off. I've been in this same situation with my Cadillac. I have Deville rims/tires on my CTS so I have to remember I'm going slightly faster than the speedometer is telling me. I got a great deal on the combination, for the rims, and didn't want to waste the tires. This coming spring, I'll likely get new tires because I want to return to the factory ride (higher aspect tires are a bit floaty) and accurate speedometer.

This might be something that 850OBD2 app can do. There are several newer features that saw last time I used it, but have not explored. Right now, I'm not connected to my car so poking around is kind of limited.

Post by **scot850** » 23 Jan 2026, 14:47

This typically not a problem for me. I never wear a set of tires out any more with the low mileages we drive now we are retired. Bigger issue is they rot out long before they wear out!

Neil.