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!

COMPACT DIMENSIONS - Measuring 11.5 x 8.7 x 0.9 cm, it fits effortlessly into your setup.
LIGHTWEIGHT DESIGN - Weighs only 40g, ensuring minimal impact on your machinery's performance.
PRECISION ENGINEERING - Crafted for optimal performance in 3D printing and machinery.
DURABLE ALUMINUM BUILD - Engineered from high-quality aluminum for long-lasting use.
VERSATILE COMPATIBILITY - Perfectly fits GT2 6mm wide timing belts for seamless integration.

The 3Dman GT2 16 Toothless Bore 3mm and 20 Toothless Bore 5mm Aluminum Timing Belt Idler Pulley is a precision-engineered component designed for use with GT2 6mm wide timing belts. Weighing just 40g and featuring a compact design, this durable aluminum pulley is ideal for a variety of machinery applications, including milling machines and CNC lathes, ensuring reliable performance and longevity.

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Manufacturer	3Dman
Part number	20-05-0514-10
Item Weight	40 g
Package Dimensions	11.5 x 8.7 x 0.9 cm; 40 g
Manufacturer reference	20-05-0514-10
Size	20 Toothless Bore 5mm
Color	20 Toothless Bore 5mm
Material	Aluminum
Measurement System	Metric
Batteries Included?	No
Batteries Required?	No

3Dman GT2 16Toothless Bore 3mm 20Toothless Bore 5mm Aluminum Timing Belt Idler Pulley/Double Head for 3D Printer 6mm Width Timing Belt 20 Toothless Bore 5mm 20-05-0514-10

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