The CVT belt is an integral part of your automatic Scooter, Go Kart or ATV transmission. Scooter CVT belts (continuously variable transmission) are made by multiple companies and come in various compositions.
Premium grade CVT belts are available from Gates and Bando and other brands like Polini and Naraku. Aramid is a generic name for a certain bulletproof fabric that is strengthened for more strength and long life. It is used in the premium Gates and Bando.
With so many scooter drive belts and CVT belt sizes, it gets confusing, which is the correct belt size, and which are the right scooter belt sizes to match an automatic scooter’s needs or your ATV’s transmission. Add in varying compositions, and you can compare belts for hours. In our guide, you can quickly use a 50cc scooter drive belt size chart to get all the information you need.
By the end, you’ll be able to pick out the correct part number for the suitable model for your dirt bike, ATV, or machine from the scooter belt size chart.
What Size Belt Does A 50cc Moped Take?
Longcase Covers for 50cc full-size scooters are widely available in CVT Drive Belt Size 72917.730. (Read Spark Plug Size Chart)
However, there is more to it than that. Scooter CVT belts are available from multiple companies and in varying compositions.
You can find premium quality CVT belts from Gates and Bando, Polini and Naraku, and more.
You’ll find premium Gates, and Bando is Aramid, a bulletproof fabric reinforced for high strength and long life.
CVT belts are measured in 3 dimensions.
- 669 = Pitch length of the belt in millimeters
- 18 = Width of the belt in millimeters
- 30 = Angle of teeth on the inside of the belt
Finding out what it has presently is one of the simplest ways to determine what belt you require.
Drive belts typically have a part number, a length, or both printed on them, though this can wear off over time or be difficult to determine if the belt snaps.
If you have a part number, try searching for your favorite search engine’s belt listing or specifications. For example, if it’s a Yamaha or Honda part, you should be able to get a replacement through a dealership or internet parts store listing.
The most typical way to describe belt size is with three numbers, for as 788 17 28.
- The first number shows the length of the belt in millimeters.
- The Width of the belt in millimeters is the second number, and the third is to express the angle of the belt’s sides.
It can be tough to find an identical match, but you should find something relatively close. For example, when looking for a 729-18-30, you might come across a 729-17.7-30.
Size variations of a few millimeters or less are frequently acceptable. If you can’t locate what you’re searching for, try to remain within a few millimeters on the first number, 0.5 millimeters or less on the second, and 2 degrees on the third.
If you’re using the current belt to decide on a replacement, double-check that it fits the CVT snugly, just in case a prior owner or mechanic placed the incorrect belt.
The belt should be long enough to reach or come close to the outer borders of the rear pulley while sitting comfortably against the driving boss in the front pulley. (Learn How To Fix Car Sun Visor)
When closed, it should be wide enough to reach the outer edges of the pulleys, and when open, it should be thin enough to reach the center of the pulleys.
The angles should be as similar as possible to the angles of the driving faces. If any of this appears to be inaccurate, use the additional methods stated in this section to confirm the correct belt size.
For some scooters, the needed belt part number or size may be found in the owner’s manual or in a service manual. You may find the sizes of some Chinese scooters in the table below. However, it’s still a good idea to compare your present belt length if you can because some engines have less common versions that need different belts.
| Engine Platform | Belt Case Length & Details | Belt Size |
|---|---|---|
| 139QMB/GY6 50 | Short (8 Bolts in CVT cover) | 669-18-30 |
| 139QMB/GY6 50 | Long (10 Bolts in CVT cover) | 729-18-30 |
| 139QMB/GY6 50 | QJ Long (VentoMotoMojo) | 891-17-30 |
| 139QMB/GY6 50 | 139QMB w/Minarelli 2T Style CVT(QJ1P39QMB-3) | 836-17-30 |
| 1E40QMB/Minarelli Clone | Short & Long | 788-17-28 |
| 1E40QMB/Minarelli Clone | Adly Long (Stretched version of a short case) | 878-17-28 |
| GY6 125-150 | Short | 743-20-30 |
| GY6 125-150 | Long | 842-20-30 |
In your search, you may come across belts in various pricing ranges and brands.
You may spend a lot more money replacing a bunch of cheap belts than you would on a decent one that will last a long time. Gates and Bando belts are well-known brands.
Be warned that some Chinese clones of high-quality belts, such as Bando, exist.
The belt you’re looking at maybe a knockoff if it doesn’t match other belts of the same make and number, especially if the price seems too good to be true.
Quality replacements are also available from performance component manufacturers such as Malossi, Polini, Stage6, and others.
If your belt is supplied through the original Japanese or European manufacturer’s dealers (Yamaha, Honda, Piaggio, etc.), it should be of good quality.
How Do You Read a CVT Belt Size?
There are three dimensions to CVT straps. Here are some examples of numbers found in 66980-30 belts: The pitch length of the belt is 68.69 mm. 18. Millimeters of belt width The tooth angle on the inside of the belts is 31 degrees.
Belts for CVT transmissions. It is specifically developed for various motorized CVT applications, including scooters and go-karts that are allowed on the street. The performance of a standard belt is OEM-equivalent or better.
The CVT (Continuously Variable Transmission) belt is an integral part of your automatic Scooter’s, Go Kart or ATV’s transmission.
CVT drive belts for scooters are made by a variety of vendors and come in various compositions.
Many offerings stock Gates and Bando high-quality CVT drive belts and their own brand.
The premium Gates and Bando are reinforced with Aramid (a generic name for a certain bulletproof fabric), offering high strength and durability.
CVT drive belts are measured in 3 dimensions. For example, here is what the numbers of a 669-80-30 belt mean:
- 669 = The Pitch Length of the belt in millimeters
- 18 = The Width of the belt in millimeters
- 30 = The Angle of the teeth on the interior of the belt
Here you can find a complete CVT belt size chart that offers all the sizes you may ever have to order if not included on the smaller chart above. To buy, it should be straightforward once you have the model and part number needed, be it Brando, Gates, or another brand. (Learn How To Remove Stripped Hex Bolt)
Scooter Drive Belt Size Table
| Scooter Drive Belt Sizes | Model and Application |
|---|---|
| 350-5m 15mm | Exkate powerboard x-24 electric skateboard - drive belt |
| 384-3m-12mm | X-Treme X-010 |
| Xcooter 50 - electric scooter drive belt | |
| Alpha electric scooter drive belts | |
| Step 'n Go scooter drive belts | |
| Master Shine scooter drive belts | |
| Spartan Sports ES-200 - electric scooter drive belt. There is a 14mm wide belt, but this works without issue | |
| 399-3m-12mm | Step 'n Go scooter electric scooter drive belt |
| Master Shine scooter electric scooter drive belt | |
| 400-5m-12mm | Bubba electric scooter drive belt |
| 420-3m-12mm | X-treme X-140 electric scooter drive belt |
| 447-3m-12mm | Razor E100 electric scooter drive belt |
| Lazor E100 electric scooter drive belt | |
| 475-5m-12mm | Exodus X8 scooter drive belt |
| 535-5m 15mm | Vapor X24 Electric Scooter drive belt |
| Zappy 1 Electric Scooter drive belt | |
| Amplifier A7 Electric Scooter drive belt | |
| Tomb Raider Electric Scooter drive belt | |
| Street Jammer Electric Scooter drive belt | |
| E-boarder Electric Scooter drive belt | |
| 550-5m 15mm | Vapor x-24 electric scooter drive belt |
| Z-Cruiser electric scooter drive belt | |
| ROY electric scooter drive belt | |
| 550-5m 18mm | Zappy 2 electric scooter drive belt |
| Zappy Turbo electric scooter drive belt | |
| 560-5m 15mm | Razor E-200 |
| 575-5m 15mm | Hubble electric scooter drive belt |
| Sporty 24 electric scooter drive belt | |
| Spartan sports electric scooter drive belt | |
| Tornado Mini electric scooter drive belt | |
| Huffy Buzz electric scooter drive belt | |
| Star II e-scooter drive belt | |
| Street Cruiser electric scooter drive belt | |
| Tornado Mini electric scooter drive belt | |
| 579-3m 12mm | Citybug Model 420 electric scooter drive belt |
| Huffy Buzz (with seat) electric scooter drive belt | |
| 579-3m 15mm | Citybug 420 electric scooter drive belt (new models) |
| Citybug Helper electric scooter drive belt | |
| 600-5m 15mm | Vapor |
| X-Treme X11 | |
| HCF 701 E-Raser electric scooter drive belt | |
| HCF 705 Pacelite electric scooter drive belt | |
| ETEK force electric scooter drive belt | |
| Reflex electric scooter drive belt | |
| POWER SCOOT electric scooter drive belt | |
| City Mantis electric scooter drive belt | |
| Rad2Go ZZ Rider and other models | |
| 600-5m 18mm | SE-Zappy scooter drive belt |
| 606-3m 12mm | Silver bomber electric scooter drive belt |
| 612-3m 12mm | Hearthland America electric scooter drive belt |
| Silver Bomber scooter drive belt | |
| 670-5m 15mm | Badsey Hot Scoot electric scooter drive belt |
| 700-5m 18mm | Scoobug scooter drive belt |
| 700-5m 20mm | Charly electric scooter drive belt |
| 750-5m 15mm | EV Scoota electric scooter drive belt |
| HYC XCaliber electric scooter drive belt | |
| 800-5m 15mm | Cute electric scooter drive belt |
| Nomad electric scooter drive belt | |
| NORICAR electric scooter drive belt | |
| Escort electric scooter drive belt | |
| HCF 002 electric scooter drive belt | |
| HCF 301 electric scooter drive belt | |
| 825-5m 15mm | XPort SLX electric scooter drive belt |
| HCF 707 electric scooter drive belt | |
| Pacelite 707 electric scooter drive belt | |
| 835-5m-19mm | Vego SX 600 electric scooter drive belt |
| 920-8M-20 | EGO Cycle drive belt |
| 980-5m-15mm | Vego iQ 450 Electric scooter drive belt |
| XL 0180-037 | Kysor Jet scooter drive belt |
| XL 0140-035 | Sharper Image X2 drive belt |
