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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⚙️ Elevate your 3D printing game with precision pulleys that keep you ahead of the curve!

PRECISION FIT - 5mm bore diameter guarantees a snug, wobble-free fit on your 3D printer or CNC machine shafts.
BULK PACK ADVANTAGE - Get 10 high-quality pulleys in one pack—perfect for upgrades, replacements, or multiple projects.
DURABLE LIGHTWEIGHT - Crafted from premium aluminum, each pulley weighs just 3g, combining strength with minimal added weight.
SEAMLESS BELT MOVEMENT - Toothless 20-tooth design ensures whisper-quiet, frictionless timing belt operation.
TRUSTED QUALITY SUPPORT - Made in the USA with responsive customer service offering replacements or refunds within 24 hours.

The 3Dman GT2 20 Toothless Bore 5mm Aluminum Timing Belt Idler Pulley pack includes 10 lightweight, durable pulleys designed for 6mm wide GT2 timing belts. Engineered for smooth, quiet operation with a precise 5mm bore, these aluminum pulleys are ideal for 3D printers, CNC machines, and other precision equipment, ensuring reliable performance and easy installation.

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Ali H.

Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

Farhan Q.

The delivery time was excellent, and the packaging was secure.

2 months ago

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Brand	3Dman
Manufacturer	3Dman
Country of Origin	USA
Colour	20 Toothless Bore 5mm
Item Weight	40 g
Package Dimensions	11.5 x 8.7 x 0.9 cm; 40 g
Item part number	20-05-0514-10
Are batteries included?	No

3Dman GT2 20 Toothless Bore 5mm Aluminum Timing Belt Idler Pulley for 3D Printer 6mm Width Timing Belt (Pack of 10pcs)

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