Is this tool for 8 speed bikes.

Yes. All modern bicycle chains have 1/2" spacing, or pitch, between pins. This tool will work on an 8-speed chain.

This gauge has two measurements, 0.5 and 0.75, I have a 7 speed mountain bike. Which measurement should use for when it is time to get a new chain?

My understanding is that a 7-speed drivetrain can tolerate much more wear than newer 11- and 10-speed. My understanding is that 11-speed needs 0.5%, 10-speed is 0.75%. I would personally also use 0.75% for 9-speed, although I have gone farther to 1% without trouble in the past. But for a 7-speed chain you can certainly go to 1% wear before changing a chain. I'm sure there are chain wear tools out there that measure the larger 1% wear than this one. But if you use this one for a 7-speed chain, in my opinion you can consider the 0.75% level an early warning sign to replace the chain.

Where is this Park Tool made?

The package says USA. Based on what I learned from my bike mechanic, this is not the best choice. He showed me something that cost around $20 and just drops in and seems a little better. A chain gauge by ProGold seems like the one he has.

Alright, I must of missed something! Just what in tarnation does the size of a man's... cassette have todo with the condition of his chain?

The size of your cassette has nothing to do with the chain condition. Size doesn't matter, but using a 11X21 cassette would make you more manly! In this case the smaller the cassette the more manly ..... as opposed to the other thing .....

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Park Tool CC-3.2 Bicycle Chain Checker 5-12 Speed

Product ID: 2161598

Details

Brand
Park Tool
Item Highlight
Park Tool Wear
Item Weight
0.27 g
Item dimensions L x W x H
3.25 x 0.25 x
Material
Metal

📏0.5% & 0.75% precision wear detection

🔧Durable metal build, lifetime warranty

⚙️Fits 5-12 speed chains seamlessly

RM107

Duties & taxes included

In stock

Sold byAmazon MalaysiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚴‍♂️ Stay ahead of the pack with precision chain care!

TRUSTED DURABILITY - Crafted from premium metal with a limited lifetime warranty, this tool is built to last through every cycling season.
COMPACT LIGHTWEIGHT - Slim 3.25" design and featherlight 0.27g weight make it the perfect tool to carry on every ride or in your toolkit.
UNIVERSAL COMPATIBILITY - Engineered to fit all 1/2" pitch chains from 5 to 12 speeds, ensuring versatile use across your bike collection.
GO NO GO GAUGE SIMPLICITY - Instantly tells you when it’s time to replace your chain—no guesswork, just confident maintenance.
PRECISION CHAIN HEALTH CHECK - Accurately measures chain wear at critical 0.5% and 0.75% thresholds to keep your ride smooth and safe.

The Park Tool CC-3.2 Bicycle Chain Checker is a precision metal gauge designed to measure wear on 1/2" pitch bicycle chains compatible with 5 to 12 speed setups. Featuring a go/no-go indicator for 0.5% and 0.75% wear, it helps cyclists maintain optimal chain performance and prevent drivetrain damage. Compact, lightweight, and backed by a limited lifetime warranty, it’s a must-have tool for serious riders and bike professionals.

Specifications

ASIN	B000BR3LHQ
Best Sellers Rank	#10,561 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #19 in Bike Shop Tools
Brand Name	Park Tool
Customer Reviews	4.8 4.8 out of 5 stars (3,123)
Global Trade Identification Number	00763477001344
Included Components	Chain Tools
Item Dimensions	3.25 x 0.25 x 11 inches
Item Type Name	Tools
Item Weight	0.27 g
Manufacturer	PARK TOOL
Material Type	Metal
Model	CC-3.2
Number of Items	1
Part Number	150892
Thread Style	Unc
UPC	763477001344 744288052985
Unit Count	1 Count
Warranty Description	Limited Lifetime Warranty

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