Is the quick link supplied with the chain a re useable one?

I know KMC do sell reusable links but not sure if this chain is supplied with one. What I can say is I have used these chains for years and never had an issue reusing the link after removing the chains once a week for a deep clean. I ride 200 miles weekly so my chains only last approx 2 months, not sure if there would be issues on a longer timescale. Great chains!

Do these chains have quick links?

Yes, one Gold joining link included

I bought a rockrider st520 bike, it came with this chain (kmc z7), but the bike is 8 speeds. is this chain for 8 speeds?

You would need the Z8, however there is negligible difference between the 6,7,8 speed chains so it would probably be ok. Please inspect the chain rings and cassette for wear as a new chains don't always mesh well with worn teeth.

I have an old apollo javelin 12 speed - is that chain compatible ? current one is 113 links

You should go for a z6 but the z7 would probably do. Watch for wear on the rings and cassette as a new chain doesn't always mesh well with worn parts

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KMC Bike Chain Performance Bicycle Chain, Quality & Highly Compatible

KMC Bike Chain Performance Bicycle Chain, Quality & Highly Compatible

Product ID: 100910810

Details

Brand
KMC
Item pitch
0.5 inches
Load capacity
1.1E+3 lbf
Material
Alloy Steel
Plate thickness
0.03 Inches

⚡lightweight 200g for speed

🔗alloy steel durability

⚙️114 links precision fit

€ 25.45

Duties & taxes included

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Description

🔗 Shift Faster, Ride Stronger, Own the Road.

BUILT TO ENDURE - Crafted from premium alloy steel, designed to withstand 1,100 lbf load capacity for relentless durability on every ride.
FEATHERWEIGHT POWER - At just 200 grams, this chain slashes weight without sacrificing strength—accelerate faster and push harder.
TRUSTED INDUSTRY LEADER - Backed by KMC’s 40+ years of innovation and a 2-year warranty, ensuring peak performance and peace of mind.
UNIVERSAL COMPATIBILITY - Effortlessly pairs with all major 5-7 speed drivetrains including Shimano, SRAM, and Campagnolo—one chain to rule them all.
SEAMLESS SHIFTING MASTERY - Chamfered inner plates engineered for ultra-smooth, whisper-quiet gear changes that keep you in the flow.

The KMC Z7 Bicycle Chain is a high-performance, lightweight (200g) alloy steel chain with 114 links, designed for 5 to 7-speed systems. Featuring chamfered inner plates for smooth, quiet shifting, it’s compatible with all major brands like Shimano, SRAM, and Campagnolo. With a robust 1,100 lbf load capacity and backed by over 40 years of KMC expertise plus a 2-year warranty, this chain delivers durability and speed for city, touring, and fixed gear riders alike.

Specifications

ASIN	B07JVBH1C6
Best Sellers Rank	1,814 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) 2 in Cycling Chains
Brand	KMC
Country Of Origin	China
Customer Reviews	4.6 out of 5 stars 1,536 Reviews
Global Trade Identification Number	04715575890869
Included Components	6/7 Speed Chain, 1x Joining Link
Item Length	1447.8 Millimetres
Item Type Name	Kmc Z7 Chain
Item Weight	200 Grams
Item pitch	0.5 inches inches
Load Capacity	1.1E+3 lbf
Load capacity	1.1E+3 lbf
Manufacturer	KMC
Manufacturer Part Number	BZ07GB114
Material	Alloy Steel
Model Number	BZ07GB114
Number of Items	1
Pitch	0.5 inches inches
Plate Thickness	0.03 Inches
Plate thickness	0.03 Inches
Product Warranty	2 year manufacturer
Recommended Uses For Product	Bicycle
Recommended uses for product	Bicycle
Roller Diameter	0.47 Inches
Specification Met	ANSI B29.1
Strand Type	Single
Unit Count	1.0 count

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