By 1980, after going through three prototypes, Profile Racing was in a full swing production of their classic 19mm box crank.
On the sidelines, Jim Alley began to prototype what would become the Legendary, Profile Racing Champ Pro frame.
What Jim brought to the table, deviating from the typical bmx frame designs at the time, were:
- A shift from a 1″ to an 1-3/8’s” down tube. This junction, between down tube and bottom bracket, complimented the Profile Box Cranks, and made a much more rigid drive train.
- A minimization of the standard bottom bracket width from 2-5/8″ to 2-1/2″. This also contributed to less flex put upon the cranks.
- The Champ Pro offered a much shorter tail section, cutting the standard length by 3/4’s of an inch. Through testing, this proved for better gate starts.