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 20 Toothless Bore 5mm Aluminum Idler Pulley 6mm

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Description

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

BULK PACK ADVANTAGE - Includes 10 pulleys to keep your projects running without interruption—stock up and stay ahead.
DURABLE ALUMINUM ALLOY - Crafted from lightweight yet robust aluminum for long-lasting mechanical reliability.
PRECISION FIT GUARANTEED - 5mm bore diameter engineered for flawless alignment with GT2 6mm wide timing belts.
SEAMLESS BELT PERFORMANCE - Toothless 20-tooth design ensures whisper-quiet, frictionless timing belt movement.
VERSATILE INDUSTRIAL COMPATIBILITY - Perfect for 3D printers, CNC machines, milling, drilling, and gear forming applications.

The 3Dman GT2 20 Toothless Bore 5mm Aluminum Idler Pulley is a high-precision, lightweight component designed for GT2 6mm wide timing belts. Made from durable aluminum alloy, this 10-pack of pulleys ensures smooth, quiet operation across a variety of mechanical transmission systems including 3D printers and CNC machines.

Specifications

ASIN	B07RV2T54M
Batteries Required?	No
Batteries included?	No
Best Sellers Rank	84,337 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 39 in 3D Printer Timing Belts
Colour	20Toothless 5mm Bore
Customer Reviews	4.5 4.5 out of 5 stars (232)
Date First Available	14 May 2019
Guaranteed software updates until	unknown
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

Reviews

K**R

Does the job

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

8.11.2020

C**P

Ok, but some with bad bearings.

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

B**L

they worked

2.08.2022

P**N

Great upgrade to my old Ender 3

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

R**4

Works great

Fits perfect on my ender 3 pro

25.12.2023

C**O

Tutto ok

7.03.2023

J**W

Top

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

23.05.2025

M**A

Läuft super!

Alles gut!

28.02.2020

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¥4003

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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TrustScore 4.5 | 7,300+ reviews

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Excellent communication throughout the order process. Product is perfect.

2 weeks ago

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

Description

Specifications

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Common Questions