If it's minimal maintenance you're after, our quality PVC belts with impregnated lubrication require less attention to make things run smoothly.
This Sportsmith treadmill running belt fits ProForm 525 EX*, Model#s PFTL52580 and PETL52590

User facing surface: Black Diamond
User facing material: PVC
Impregnated Lubrication
No need to apply lube during belt replacement

Finger-spliced seam
1 ply

*Some machines by the same name can use different parts. This is why you should always match your model#, SKU, and serial# details as provided.