are any of the gears 10/77 tooth and 2-1/16” diameter?

largest Gear in this 58pc bunch is 1.14" or about 30mm nothing larger,

What diameter axle is needed for these?

It varies - more or less 0.5 mm to 1 mm. I needed a press fit so I drilled one out until it was a tight fit on the shaft.

HOw many of these gears can interlink with each other ?

They are all supposed to be module 0.5, so they should all work with each other. I tried a bunch at random, and this seemed to be true.

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58PCS Small Gears Set Plastic Gears Module 0.5 for DC Motor DIY Model Toys RC Car Robot

Product ID: 105163935

📏Diameter range 3mm to 28mm

🤖Perfect for DIY robots & RC cars

⚙️58 precision plastic gears

4.63 OMR

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Description

⚙️ Unlock your inner engineer with every spin!

PRECISION MODULE 0 5 - Engineered for smooth, reliable gear meshing in motors and robotics.
VERSATILE GEAR SIZES - From tiny 3mm to robust 28mm diameters, fit every intricate build.
COMPACT LIGHTWEIGHT - Durable plastic construction keeps your builds agile and efficient.
DIY READY COMPATIBILITY - Ideal for DC motors, RC cars, robots, and model toys—unleash your creativity.
COMPREHENSIVE 58 PIECE SET - All the gears you need to power up your DIY projects and models.

This 58-piece plastic gear set features module 0.5 gears ranging from 3mm to 28mm in diameter, designed for precision and versatility in DIY projects. Perfect for enhancing DC motors, RC cars, robots, and model toys, it offers a comprehensive assortment to fuel your creative engineering endeavors.

Specifications

ASIN	B07JWDF71T
Age Range Description	Adult
Best Sellers Rank	#89,565 in Toys & Games ( See Top 100 in Toys & Games ) #19 in Toy Interlocking Gear Sets
Brand Name	URIMPAVIDO
Color	White
Customer Reviews	4.3 4.3 out of 5 stars (546)
Educational Objective	Game, play
Manufacturer	JLMetal
Manufacturer Part Number	B07JWDF71T
Material Type	Plastic
Number of Players	1
Operation Mode	Manual
Power Source	Hand-powered
Set Name	58pcs Plastic Gears Set
Size	58
Supported Battery Types	No batteries required
Theme	toys & robotics
Unit Count	58 Count

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