A Sole ST90 treadmill making a rhythmic clicking noise while you walk or run is one of the most common calls we get on this machine, and it almost always comes back to the slat belt deck, not the drive motor. The ST90 uses an interlocking slat belt instead of a continuous rubber belt, and that design changes what actually breaks and where the noise is coming from.
Common Symptoms
- A click that repeats once per belt rotation: the same clicking sound at a consistent interval no matter how fast or slow you go, which points to one specific slat or connector rather than the whole deck.
- Clicking that gets louder under load: quiet when the deck is empty, noticeably worse once you start walking or running on it.
- A clicking or tapping sound near the front or rear roller: localized to one end of the deck instead of spread evenly across the belt.
- An intermittent click that comes and goes: often tied to speed changes or incline adjustments rather than being constant.
- A metallic click paired with a slight vibration underfoot: usually felt through the slats themselves, not just heard.
- Clicking that started after moving or reassembling the treadmill: a strong sign something shifted out of alignment during the move.
Root Causes: What Is Actually Happening
- A worn or cracked slat connector: the ST90's deck is built from interlocking slats joined by connector pins. When one connector wears down or cracks, that single slat rocks slightly out of plane with its neighbors and taps against the deck frame or the next slat on every rotation. This is the single most common cause of a repeating click on this model.
- A bent or warped individual slat: if one slat gets bent, usually from stepping on hard while dismounting or from something getting caught underneath, it no longer sits flush and catches the side rail as it comes around.
- Debris lodged between slats: small objects, screws, or hardened dust and lint can wedge into the gap between two slats and click against the frame every time that section passes through.
- Worn front or rear roller bearings: the rollers that drive the slat belt around ride on sealed bearings. As those bearings wear, they develop play that shows up as a clicking or tapping sound concentrated at whichever end has failed.
- Loose side rail or deck frame hardware: the bolts holding the deck frame and side rails together can work loose over time, especially after transport, letting metal parts tap against each other under load.
- A worn motor drive belt: less common, but a glazed or slightly stretched internal drive belt connecting the motor to the front roller can slip and click at certain speeds, distinct from the slat-related causes above.
What NOT to Do
- Spraying silicone lubricant on the slats: the ST90's slat belt is designed to run dry. Lubricant attracts dust and debris straight into the connector joints, which makes clicking and wear worse, not better.
- Tightening the deck bolts without finding the source first: cranking down every visible bolt can pull the frame slightly out of square and introduce a new noise on top of the original one.
- Running the treadmill at high speed to try to identify the click: a loose slat or worn bearing under load can fail suddenly. Diagnose at a slow, controlled speed first.
- Ignoring an intermittent click because it isn't constant: a connector that's starting to crack often clicks intermittently before it fails completely. Waiting usually turns a small repair into a full slat replacement.
Professional Treadmill Repair in Dallas Fort Worth
2EZ TEK diagnoses and repairs Sole treadmills all over Dallas Fort Worth, and the ST90's slat belt design is different enough from a standard belt treadmill that it genuinely helps to have a tech who has worked on this specific deck before. We isolate which slat, connector, or roller is actually making the noise before we touch a single bolt, so you're not paying for parts that were never the problem.
We work directly in homeowners' garages and home gyms, not just commercial facilities. A lot of repair companies treat residential calls as an afterthought. At 2EZ TEK, home gym equipment is most of what we do, and we show up with the parts and tools to get a slat belt deck back to running quiet the same visit whenever possible. We service all major brands, including NordicTrack, ProForm, Life Fitness, and Precor, with same-week appointments across the DFW metroplex.
If you want to look up your own ST90's specs or service documentation before we arrive, 2EZ TEK also maintains a free manual library at 2eztek.com/manuals with assembly guides and owner manuals for most major equipment brands.
Frequently Asked Questions
Is a clicking noise on my Sole ST90 dangerous to keep using?
A steady click by itself usually isn't an immediate safety issue, but a cracked slat connector or worn roller bearing gets worse under continued load. If the click is getting louder or more frequent, it's worth having it looked at before it turns into a bigger repair.
Can I fix a clicking slat myself?
Identifying which slat or connector is the source is straightforward, but replacing individual slats on the ST90's interlocking deck requires removing and realigning the surrounding sections correctly, which is easy to get wrong without the right approach. Most homeowners have us handle it after locating the general area themselves.
How much does this kind of repair typically cost?
It depends on whether it's a single slat connector, a full slat replacement, or a roller bearing issue, since parts and labor differ for each. We diagnose on site and give you a clear price before doing any work.
Get Your Treadmill Running Again
If your Sole ST90 has developed a clicking noise, call 2EZ TEK for same-week diagnosis and repair anywhere in Dallas Fort Worth.