What is the TPI? 24 or 26?

Yes it can matter. I need a longer axle to put training wheels on my daughters bike, but it has a different hub/bearing system (than what is pictured here) that threads on the axle with 24 tpi (threads per inch), but uses this same standard 3/8 shaft. I have already bought one that is 26 that won't work... looking for 24. I did a rough measurement with calipers and didn't realize they had standard axles so close in TPI - now waiting another week and out $15.

Will this work on 20 inch kids bike? I need to add training wheels.

The axle itself should fit. I bought this axle to add adult training wheels to a 24" kids bike and it was just a little to short

Does it fit a 7 speed freewheel?

Yes. It fitted my 7 speed freewheel.

Alta Bicycle Multiple Speed Rear Hub Axle 3/8" x 185mm Long, Multiple Colors

产品编号: 180248359

🎨Multiple Colors

📏185mm Length

⚙️3/8" Axle

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描述

🚴‍♂️ Elevate Your Cycling Game!

SLEEK AESTHETIC - Available in multiple colors to match your bike's style and stand out on the road.
EASY INSTALLATION - Quick and hassle-free setup, so you can hit the road faster.
UNLEASH YOUR RIDE - Transform your cycling experience with the Alta Multiple Speed Rear Hub Axle.
PRECISION ENGINEERING - Crafted for durability and performance, ensuring a smooth ride every time.
VERSATILE COMPATIBILITY - Designed to fit a variety of bicycles, making it the perfect upgrade for any cyclist.

The Alta Bicycle Multiple Speed Rear Hub Axle is a high-quality 3/8" axle measuring 185mm in length, designed for enhanced performance and compatibility with various bicycles. Available in multiple colors, it combines functionality with style, making it an essential upgrade for any cycling enthusiast.

规格

Brand Name	Alta
Manufacturer	F & R Cycle Inc
Part Number	177238-177250
Size	Black

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