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"

3dman Gt2 16toothless Bore 3mm 20toothless Bore 5mm Aluminum Timing

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€ 39.75

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Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚙️ Upgrade your 3D printer’s heartbeat with flawless belt motion!

DURABLE YET LIGHTWEIGHT - Crafted from premium aluminum weighing only 3 grams, balancing strength with minimal added weight.
PRECISION FIT GUARANTEED - 5mm bore diameter engineered for a snug, wobble-free installation on GT2 6mm timing belts.
SEAMLESS BELT PERFORMANCE - Toothless 20-tooth design eliminates layer shifts and ensures ultra-smooth 3D printing results.
TRUSTED QUALITY SUPPORT - Backed by 3Dman’s responsive customer service and hassle-free replacement or refund policy.
VERSATILE INDUSTRIAL COMPATIBILITY - Perfect for CNC machines, milling, drilling, and 3D printers—upgrade your workflow effortlessly.

The 3Dman GT2 20 Toothless Bore 5mm Aluminum Timing Belt Idler Pulley is a precision-engineered, lightweight aluminum component designed for GT2 6mm wide timing belts. Its toothless design ensures smooth, jitter-free belt movement, ideal for 3D printers and various CNC machinery. With a 5mm bore for exact fit and a durable build, it enhances print quality and machine reliability, supported by a trusted brand with excellent customer service.

Specifications

ASIN	B07RV2T54M
ASIN	B07RV2T54M
Batteries Included?	No
Batteries Required?	No
Color	20 Toothless Bore 5mm
Customer Reviews	4.5 4.5 out of 5 stars (212)
Customer reviews	4.5 4.5 out of 5 stars (212)
Date First Available	11 June 2019
Date First Available	11 June 2019
Item Weight	40 g
Manufacturer	3Dman
Manufacturer	3Dman
Manufacturer reference	20-05-0514-10
Manufacturer reference	20-05-0514-10
Material	Aluminum
Measurement System	Metric
Package Dimensions	11.5 x 8.7 x 0.9 cm; 40 g
Package Dimensions	11.5 x 8.7 x 0.9 cm; 40 g
Part number	20-05-0514-10
Size	20 Toothless Bore 5mm

Reviews

K**R

A couple of the bearing are a bit notchy, but that's not going to cause a problem for this application

8.11.2020

P**N

Upgraded my Ender 3 with these pulleys. The belt tensioners came with toothed pulleys which were a constant problem (layer shifts). The prints with these are absolutely smooth and works great. A highly recommended upgrade that's even cheap.

16.01.2024

C**O

Tutto ok

7.03.2023

J**W

Die Teile halten was sie versprechen. Top. Alles Bestens. Laufen an einem CNC-Plotter.

23.05.2025

C**P

I use these on 3d printersz and they're great for Gates GT2 6mm belts. A few of these came with dry, or rough bearings which was a pity. Otherwise they were decent quality, and the belt surface and aluminium outers were good.

15.07.2020

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