If it's minimal maintenance you're after, our quality PVC belts with impregnated lubrication require less attention to make things run smoothly.
Sportsmith treadmill running belt fits ProForm Trainer 420*, Model#s 304640 and 247330

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, serial# or details as provided.