What's the difference between the seventh and ninth choices in this listing?

The seventh is - 40 teeth/8mm bore, the ninth 60 teeth/8mm bore. The 60 teeth is bigger diameter than 40 teeth.

Can I use this for a Velec electric bike chain?

This is a Timing Belt Idler Pulley made from Aluminum. I did not use it on my project, but used pair of flanged ball bearings for the pulley I need. If your bike chain made from steel metal I wouldn't recommended to use as a pulley for it. Aluminum will be worn out very quick.

What is the flange diameter on these?

Flange diameter is 0.704" Flange thickness is 0.039" Belt Hub diameter is 0.473" Belt Hub width is 0.255"

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Description

⚙️ Elevate your machine’s rhythm with flawless timing!

BULK PACK ADVANTAGE - Includes 10 high-quality idler pulleys—perfect for upgrades, repairs, or multiple projects.
DURABLE YET LIGHTWEIGHT - Crafted from premium aluminum alloy, balancing strength with minimal weight (3g each).
PRECISION FIT GUARANTEED - 5mm bore diameter engineered for exact compatibility with standard GT2 shafts.
VERSATILE INDUSTRIAL USE - Ideal for 3D printers, CNC machines, milling, drilling, and other mechanical transmissions.
SEAMLESS BELT PERFORMANCE - Toothless 20-tooth design ensures whisper-quiet, frictionless timing belt movement.

The 3Dman GT2 20 Toothless Bore 5mm Aluminum Timing Belt Idler Pulley is a precision-engineered component designed for GT2 6mm wide timing belts. Made from lightweight yet durable aluminum alloy, each 3g pulley features a 5mm bore for perfect shaft alignment and a toothless 20-tooth design for smooth, quiet operation. Sold in packs of 10, these pulleys are essential for enhancing performance in 3D printers, CNC machines, and various mechanical transmission systems.

Reviews

M**9

Work great!

They arrived in good shape and work for an Ender3 belted Z axis upgrade.

9.06.2024

T**N

They seem to work as stated

These work like they're supposed to. Thumbs up

31.08.2025

J**U

Quality Product and Timely Delivery

A well-made product. Timely delivery (overnight than the expected time). Packaged well. Will recommend.

11.03.2024

P**N

Great price

Great price on pulleys that are useful in Middle and High School science projects. These can be used with string or twine instead of a toothed belt.

27.11.2024

J**E

Nice paired set of pulleys

This is a good set of pulleys that is very useful for a quick gear change ratio. I use them for getting a bit more resolution on telescope focusers controlled via stepper motors. They are true to size and can be bored out a bit larger if necessary depending upon your shaft OD. The included belt is fiber-based and flexible, not the steel core type that is prone to failure.

31.07.2023

M**E

Perfect fit

Works for my 3D printer build.

22.04.2023

B**5

Perfect!

Exactly the right size for the Y axis motor on my Ender 3 Pro as my replacement motor did not have a gear attached to it

10.01.2023

R**4

Works great

Fits perfect on my ender 3 pro

25.12.2023

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