Question on driver changes

[culvert]

Have a 97MTNMax. Went from a 9 tooth driver down to an 8 tooth fit fit a 2" track. How much does this affect the speedo?

Just wondering how fast the sled is really going.

Thanks.....Culvert

 

[Ding]

Speedo reading * 8 / 9 . . .
or
Speedo reading times 8 divided by 9 . . .
or
8 9ths of what it reads . . .