This updated guide explains why the treadmill belt matters, how belts are constructed, and what routine care they need. It covers cleaning, using manufacturer-recommended silicone lubricants, adjusting tension and tracking, choosing appropriate belt size for running vs. walking, and symptoms that indicate replacement or professional service.
Why the belt matters
The walking or treadmill belt is one of the two components most likely to need replacement (the other is the deck). A worn belt increases friction, stresses the motor, and changes ride feel. Replacing or maintaining the belt extends the life of the entire machine.
Construction and replacement cost
Belts are built in layers (plies); more plies generally mean greater durability. Consumer models use thinner, lighter constructions while commercial-grade belts use thicker, multi-ply materials for heavy use.
Replacement belts vary by length, width, and construction. Typical consumer replacement belts can range widely in price depending on size and brand; many fall in the low hundreds of dollars, while commercial belts cost more.
Routine care: cleaning and lubrication
Keep the belt and the deck clean. Dust, hair, and grit trapped between belt and deck increase wear. Vacuum under and around the treadmill regularly and wipe the belt edges with a dry cloth.
Only use lubricants recommended by your treadmill manufacturer. Most manufacturers specify a silicone-based treadmill lubricant. Do not use household oils, heavy greases, or petroleum-based products - these can break down the belt material, attract dirt, and void warranties.
Tension and tracking: alignment basics
A properly tensioned belt should move smoothly without slippage or excessive drag. Check tracking (side-to-side alignment) regularly. If the belt wanders, most treadmills provide rear roller bolts to adjust tracking; make small adjustments and test before doing more.
Do not overtighten the belt. Excess tension increases wear on bearings, rollers, and the motor. If you hear knocking, grinding, or loud unusual noises, stop using the treadmill and inspect the belt and rollers. When in doubt, contact a technician.
Sizing for your stride
Pick a belt length and width that suit your primary use. Runners generally need longer, wider belts while casual walkers can use shorter, narrower models. Many runners prefer a belt 20 inches wide or wider; walking-only users sometimes see 17-inch belts on compact machines. 1
When to replace the belt
Replace the belt if you see frayed edges, visible cracking, excessive slipping that can't be fixed by tensioning, or if the belt has become thin and glossy from wear. Regular inspections - monthly for heavy users, quarterly for light users - help catch problems early.
Quick troubleshooting checklist
- Noise: check rollers, deck condition, and belt tracking.
- Slipping: verify tension and lubrication is up to date.
- Uneven wear: inspect for debris and proper alignment.
Final note
Treadmill belts require simple, regular care: keep them clean, use the correct lubricant, maintain proper tension and alignment, and choose a belt size suited to your workouts. Doing so reduces replacement frequency and keeps the treadmill running smoothly.
- Confirm current price range for consumer and commercial replacement treadmill belts (typical low-high prices in 2025).
- Verify recommended minimum belt widths and lengths for walking vs. running (industry manufacturer guidance, e.g., 17" vs. 20" thresholds).
- Confirm typical lubrication intervals recommended by major treadmill manufacturers in 2025.
- Verify common ply counts and typical differences between consumer and commercial belt constructions.
- Confirm recommended inspection frequency for heavy vs. light users (monthly vs. quarterly guidance).