If it's minimal maintenance you're after, these quality PVC belts with impregnated lubrication require less attention to make things run smoothly.
Sportsmith treadmill walking/running belt fits Horizon T101, serial#s TM659 and TM621
User facing surface: Black Diamond
User facing material: PVC
Impregnated Lubrication
Finger-spliced seam
*Some machines with the same name can use different parts. This is why you should match your brand, model name, model#, serial#, SKU details as provided. Details for your machine can be found on a label attached to the frame. Label is commonly found near the main power switch for the machine.