If it's minimal maintenance you're after, these quality PVC belts with impregnated lubrication require less attention to make things run smoothly.
This Sportsmith treadmill walking belt fits Reebok 8100 ES* treadmill Model# RBTL696080

User facing material: PVC
User facing surface: Black Diamond
Impregnated Lubrication
Finger-spliced seam
1-ply
*Some machines with the same name can use different parts. This is why you should always match your model# or serial#.