How Tight Should a treadmill Belt Be?

How Tight Should a treadmill Belt Be? It is a common question posed by folks who are obsessed with losing weight or staying fit and enjoy running on a treadmill.

Treadmills not only help you stay in shape, but they also significantly reduce the risk of injury associated with outside running. As we all know, many components go into making a treadmill, but the most important is the running belt, which must be properly adjusted so that you may use the treadmill securely.

Just lift the belt a little bit at the edge of the treadmill in the center of the deck, to determine whether the belt is properly tightened. It should be able to lift by 3 to 4 inches if it is tight enough. On the other hand, if you feel the belt is too snug and if it raises less than 3 inches and too loose if it lifts more than 4 inches.

After conducting some study on the treadmill, I wrote this article on how it should be tightened or loosened, so you may handle it easily at home without any professional assistance.

What Does a Treadmill Belt Do? 

If you don’t know the answer let me inform you that when the treadmill is turned on, the treadmill belt spins around the base, and the belt moves even when the base remains stationary. It allows the user to walk as if on a street rather than on the treadmill’s fixed base.

Why a Treadmill Belt Should Be Tight?

We have seen a rise in the number of people buying treadmills to use at home instead of running or walking outside or going to the gym in recent years. 

Together with your purchase and the freedom to exercise whenever you want comes the word ‘responsibility.’

Maintenance is essential for extending the life of your machine and when your treadmill is in good working order, you can relax knowing that your workout will be both safe and effective.

Making sure the treadmill belt tension is adequate is one aspect of machine maintenance. As a result, comprehending how to adjust a treadmill belt is essential.

It’s time to begin looking at why a treadmill belt could need tightening, how to tell if it does, and how to do it.

How to Adjust Your Treadmill Belt?

How to Adjust Your Treadmill Belt

To do this task, basically you won’t need much equipment to adjust the treadmill belt except a good wrench available. There is something else you need to keep in mind some treadmills will necessitate the use of an Allen wrench.

More importantly, you shouldn’t be able to lift the belt more than 4 inches off the edge in the center of the deck when the treadmill belt is properly tensioned, not slack. 

1. Turn Off the Treadmill

For safety your device must be switched off before being unplugged from the power source.

2. Find the Roller Bolts  

There are basically two roller bolts are present which you will find on the back of your treadmill, one you will on the left side and another one is on the right. 

3. Unscrew the Bolts  

To loosen the bolts, the first thing you have to do is with the help of your wrench, turn the bolts to the left one quarter turn at a time. Remember that, if you don’t loosen both bolts in the correct order, there is no doubt that you could damage your treadmill’s belt.

4. Examine the Belt  

Lastly, all you have to do is carefully turn on both bolts after each quarter. Now it’s time to double-check the belt. You have to continue above process until you cannot lift the belt and place your hand beneath it.

How Tight Should Your Treadmill Belt be?

At this stage, how tight should your treadmill belt be at this point? The solution can be found by lightly lifting the belt at the treadmill’s tip in the middle of the board to see if it is the appropriate tightness level. 

It should be capable of pulling up by three to four inches if it is adequately tight. If you see that you can rise the best less than 3 inches or more than 4 inches, it is regarded to be excessively stiff or floppy.

Types of Treadmill Belts

There are many various treadmill models available on the market, but generally speaking, all of the belts are made of rubber and have three distinct thickness options below I mention 3 treadmill belts models description:

Types of Treadmill Belts

Single Ply  

This ply is one of the simplest and least expensive alternative belts, and a single piece of rubber that is wrapped around your treadmill deck.


A top layer consists of rubber or rubber PVC, and a bottom layer is used made of cotton, polyester, urethane, or occasionally monofilament for this 2-Ply. These materials are enough to make the belt significantly heavier, but they also make it much more durable. However, the belt is quieter thanks to the bottom layer, making it perfect for a home gym. 


Although these belts are the heaviest and thickest on the market, they can also be the priciest. Despite being used regularly; glue is occasionally counted as a 4-ply layer. The padding makes them quieter and keeps the belt cool by aiding in heat dissipation. The extra weight has the disadvantage of possibly straining your mechanism and reducing the treadmill’s lifespan.

Causes of Treadmill Belt Slippage

It’s very important for the users to understand each cause of the treadmill belt problem before they could fix it. The following are the main causes of your treadmill belt slipping, which I mentioned beneath:

Drive Belt Could Be Slack

The front roller is connected to the motor by the driving belt, and this roller might start to sporadically slow down, or speed up if this becomes loose. There is a vast chance that it could put the user in danger by causing the treadmill belt to slip. So I can assure you that basically there is no alternative option so tighten or replace the drive belt to fix this problem is must.

Possibly Losing Grip is The Front Roller’s Pulley

The pulley’s purpose is to keep the weight evenly distributed and the belt in alignment, thus if it somehow lost control, the belt might begin to sag and slip. If the treadmill’s entire belt finally comes loose if it is not maintained in control, any user runs a serious risk.

For Walking, The Belt Ban Be Too Loose

An abnormally loose walking belt, which develops over time as the rubber stretches, is the most likely culprit for slipping. As a result, the belt may begin to slack; if this happens, the treadmill may cease to function entirely. If the walking belt can be raised more than a few inches above the treadmill surface, it may be too loose and it needs to be tightened before use.

Lubricating The Belt Is Necessary

The bottom has been lubricated to make it easier for the treadmill belt to glide over the rollers. Silicone is frequently used to lubricate this, however, it only works for a brief period before drying out. While you are wearing the belt, if the lubrication begins to dry out, it could jolt or slip, threatening your safety

Dangers of Too-Loose Treadmill Belt

We get this complaint from consumers the most often: “The treadmill belt is slipping and what are the dangers of a too-loose treadmill belt?” It is something that should always be taken very seriously because, in addition to making it difficult for the user to get a proper workout also offers a significant risk to safety. It happens because, if the treadmill belt continues to slip while the machine is in use, there could also be major falls and accidents.

On the other hand, the treadmill’s performance can suffer if the belt is too floppy or if you’re walking belt is twisted. However, a loose belt could require the treadmill motor to work harder to turn the back roller and front roller properly.

Tread Belt Tension Adjustment

In the sections below, I’ll show you how to use the treadmill’s belt tension to make walking more efficiency step by step.

  • You must initially hold the belt as slowly as you can by adjusting the treadmill’s belt tension.
  • Once the treadmill has started, you have to press “START” button to adjust the speed to 1 km/h.
  • You must now unfasten the strap that is firmly attached to the steering wheel. Increasing your weight on the seatbelt now is important, think that as if you were about to fall. Remember that the belt could slip if there is a significant break.
  • Just halt using the treadmill, turn both screws a quarter turn clockwise. You have to repeat the previous steps 1-2 if necessary if the belt begins to slip.

Important Note: Don’t let the strap of the treadmill become too stretched. Stop when the strap can’t move anymore. On the other hand, if you see it still slips, you have to change the belt.

When to Replace a Treadmill Belt?

Here I will give you a visual inspection is the greatest approach to determine when it’s time to think about a replacement. Every 150 miles or three months, when you lube the belt, it is very important for every user to look for curling, fraying, rips, and seam stability so your treadmill can serve you for a long time without having any serious issues.


Above, I have clearly discussed why your treadmill belt might need to be tightened, how tight should a running machine belt be, and as well as the warning signs that it does. I have already mentioned how to adjust your treadmill belt through step-by-step instructions for performing this maintenance.

When performing maintenance on your machine, please unplug it from the power supply for your and your family’s safety.

Always adhere to the manufacturer’s recommendations for your individual machine. I will highly recommend seeking advice from a professional if you are unsure about what you are doing or suspect there may be a wider problem.

Please feel free to contact us if you have any treadmill tips or important comments, or if you have a question for us!!!

James Manley

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