Fitting 15in rims on S60 2.5T Topic is solved

[yanga001]

Yes you can do this...

I received a lot of conflicting information across the board about this, however at the end of the day it boils down to what kind of brake rotors you are running. In my case, my 2008 base model (2.5T is the base in this year) runs the ~286mm rotors and the Terra 15 inch rims i have fit on and cleared the brake calipers. One thing was that the clearance was close enough to rub on some stick on tire weights which seemed to have gotten snagged. I took off the weights and will eventually get these tires rebalanced.

This worked out nicely for me as my 98 V70 ran the same bore and offset as the 08 s60 on both summer and winter rims. Saves me a good chunk of change from purchasing a new set of tires and 16in rims.

This does mean i cannot run the big brake kit as the rims would not clear the larger brake set.

If you are hours into research then the easy answer is measure your rotors, if they are smaller then yes. It will fit on a p80 15 inch 5 lug alloy.

[dikidera]

Sorry for the big brain time, but just because brakes are larger doesn't mean squat. Maybe less heat but the entirety of the car stopping is due to the tyres themselves.

The cons of the 15 inchers is lower top speed and higher RPM. But probably slightly better/comfier ride

[chrism]

Sorry for the big brain time, but just because brakes are larger doesn't mean squat. Maybe less heat but the entirety of the car stopping is due to the tyres themselves.

The cons of the 15 inchers is lower top speed and higher RPM. But probably slightly better/comfier ride

I”ll have to respectfully disagree. The larger diameter the rotor is, the less pad force is required to bring the wheel to a stop. As an exaggerated example try this: Jack up a front wheel and get it spinning by hand. Using one finger against the outer edge of the rim bring the wheel to a halt- fairly easy, eh? Now spin the tire again and with one finger pressing against the wheel near the hub try to stop the spinning wheel again - much harder to do this time.

Also, about the change in speedo reading, it’s all about the outer diameter of the tire. When a smaller rim is fitted a taller profile tire can be used to keep the overall diameter equal to original.

[yanga001]

Sorry for the big brain time, but just because brakes are larger doesn't mean squat. Maybe less heat but the entirety of the car stopping is due to the tyres themselves.

The cons of the 15 inchers is lower top speed and higher RPM. But probably slightly better/comfier ride

Also, about the change in speedo reading, it’s all about the outer diameter of the tire. When a smaller rim is fitted a taller profile tire can be used to keep the overall diameter equal to original.

I am running this exact scenario. 205/65/R15's which are maybe a few mm taller than my previous tire. The michelins are a quieter tire, and the ride is much smoother.

[dikidera]

Sorry for the big brain time, but just because brakes are larger doesn't mean squat. Maybe less heat but the entirety of the car stopping is due to the tyres themselves.

The cons of the 15 inchers is lower top speed and higher RPM. But probably slightly better/comfier ride

I”ll have to respectfully disagree. The larger diameter the rotor is, the less pad force is required to bring the wheel to a stop. As an exaggerated example try this: Jack up a front wheel and get it spinning by hand. Using one finger against the outer edge of the rim bring the wheel to a halt- fairly easy, eh? Now spin the tire again and with one finger pressing against the wheel near the hub try to stop the spinning wheel again - much harder to do this time.

Also, about the change in speedo reading, it’s all about the outer diameter of the tire. When a smaller rim is fitted a taller profile tire can be used to keep the overall diameter equal to original.

Ok, you will stop the rotor. There is still inertial mass, this will entirely get absorbed by the friction of the rubber.