First things first, this crack probably is a duplicate of
images/disk_utils/cracking/the_saltine/BC Quest for Tires.dsk
You will agree with me that it's not the first directory in which to search...
I apologize and try to do not make the same mistake twice.

Fire up a bit copy program (I use Copy II+ or Locksmith) to get a copy of the original disk
then with a disk sector editor (again I use Diskoverer or Diskfixer) look at:

track $21 is used for nibble count, to skip the check routine:
track $06 sector $07 byte $E8 change $20 $00 $96 - JSR $9600 to $EA $EA $EA - NOP NOP NOP
Or if you prefer change JSR to BIT or LDA.

Bonus:
track $04 sector $0A byte $11 is the number of tires (max 9)
                     byte $4E change $CE to $AD for infinite tires