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 running belt fits certain Lifefitness 90T* treadmills
• Fits LifeFitness 90T, Serial#s ATR100000-Up*
• Fits LifeFitness 90T, Serial#s ATY100000-Up*
• Fits LifeFitness 90T, Serial#s TTA100000-Up*
• Fits LifeFitness 90T, Serial#s TTT100000-Up*
  
• User facing material: PVC
• User facing surface: Black Diamond
• Impregnated Lubrication
• Finger-spliced seam

Where used:

• Parts by Brand LifeFitness Treadmills 90T TTA100000-Up
• Parts by Brand LifeFitness Treadmills 90T ATR100000-Up
• Parts by Type Treadmill Belts
• Parts by Brand LifeFitness Treadmills 90T TTT100000-Up
• Parts by Brand LifeFitness Treadmills 90T ATY100000-Up