Retrofit kit is to convert from Leeson to McMillan drive motor on certain Cybex/Trotter treadmills.  You must also purchase a flexonic drive belt along with this retrofit kit.

Fits Cybex/Trotter treadmill models:

• 515T Sport + by Trotter (Cybex) S/N prior to A09
• 530T Pro + by Trotter (Cybex) S/N prior to A09
• 500T Sport by Trotter (Cybex) S/N prior to A09
• 520T Pro by Trotter (Cybex) S/N prior to A09
• 450T Trotter Elite (Cybex) S/N prior to A09