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

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

Product ID: 134101803

🔩5mm precision bore for perfect fit

⚙️20 toothless design for smooth belt glide

🛠️lightweight aluminum alloy, durable & corrosion-resistant

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$28.19

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Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚙️ Elevate your 3D printing game with precision and durability!

BUILT TO LAST - Crafted from premium aluminum alloy for lightweight strength and long-lasting corrosion resistance.
BULK PACK ADVANTAGE - 10-piece set keeps your projects running smoothly without frequent replacements.
PRECISION FIT GUARANTEED - 5mm bore diameter engineered for exact alignment with GT2 6mm belts—no slip, no fuss.
SEAMLESS BELT PERFORMANCE - Toothless 20-tooth design ensures whisper-quiet, frictionless timing belt movement.
VERSATILE INDUSTRIAL COMPATIBILITY - Ideal for 3D printers, CNC machines, milling, drilling, and other mechanical transmissions.

The 3Dman GT2 20 Toothless Bore 5mm Aluminum Idler Pulley is a high-quality, lightweight aluminum component designed for GT2 6mm wide timing belts. Its 20 toothless design ensures smooth, quiet belt operation, while the precise 5mm bore guarantees a perfect fit. Widely compatible with 3D printers and various CNC and mechanical machines, this 10-piece set offers reliable performance and durability for professional-grade projects.

Specifications

ASIN	B07RV2T54M
Batteries Required?	No
Batteries included?	No
Best Sellers Rank	72,713 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 29 in 3D Printer Timing Belts
Colour	20Toothless 5mm Bore
Customer Reviews	4.4 4.4 out of 5 stars (380)
Date First Available	14 May 2019
Item Weight	40 g
Manufacturer	3Dman
Manufacturer reference	20-05-0514-10
Material	aluminum
Measurement System	Metric
Package Dimensions	11.5 x 8.7 x 0.9 cm; 40 g
Part number	20-05-0514-10
Size	20 Toothless Bore 5mm

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