Track tyre size

[sam55]

I know that the preferred size of tyre on a 15" wheel is 195/50, but I've come across some track rubber for free but they're 195/55. Just wondering if that's ok? I assume the 5mm shouldn't cause any issues but just checking?

Cheers

 

[Fletcher]

What tyres are they?

 

[sam55]

Not sure of the tyre name but they're Dunlops, used in the Mini Championship

 

[Fred@BTM]

its not 5mm, its 5%

you'll be fine i would think, we run 205/50 15's

 

[sam55]

Ah didn't know that, didn't even think about size just assumed mm ha. Thanks for that, that's a big amount of money saved for my 1st track day then!

 

[Fred@BTM]

195 - width in mm
50 - % aspect ratio or whatever you call it

 

[sam55]

Just looked up how to figure out the height using the aspect ratio, if I've got it right my tyres are about 9.75mm taller than a 195/50 tyre. I'm guessing that'll be fine, if I was a serious racer it would probably go against handling but for a track day should be cool