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KMC Z51 Bicycle Chain (6 & 7 Speed , 1/2 x 3/32-Inch)

4.7 out of 5 stars 79 customer reviews
| 13 answered questions

Price: $8.93 & FREE Shipping on orders over $49. FREE Returns. Details
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  • It fits 6/7/8 speed
  • It is 1/2 x 3/32 Brown
  • It is IG compatible
  • For 6, 7, and light 8 speed use
  • Compatible with 6-12-18-21-24 speeds
47 new from $5.90
$8.93 & FREE Shipping on orders over $49. FREE Returns. Details In Stock. Ships from and sold by Amazon.com. Gift-wrap available.

Frequently Bought Together

  • KMC Z51 Bicycle Chain (6 & 7 Speed , 1/2 x 3/32-Inch)
  • +
  • Oumers Universal Bike Chain Tool With Chain Hook, Road and Mountain Bicycle Chain Repair Tool, Bike Chain Splitter Cutter Breaker, Bicycle Remove And Install Chain Breaker Spliter Chain Tool
Total price: $18.92
Buy the selected items together

Technical Details


Product Description

X10SL: superlight chain for use with 10 speed Campagnolo or Shimano, 240g. X9SL: superlight chain for use with 9 speed, 252g. Z9000: stretchproof, super-narrow chain for use with 9 speed. Z72: chamfered inner plates with Bulls-eye rivets for 7-8 speed. Z51: standard bushingless, chamfered plate chain for 5-8 speed. Z30: economy bushingless chain for 5-6 speed.

Product Details

  • Product Dimensions: 3.4 x 3.4 x 0.6 inches ; 2 pounds
  • Shipping Weight: 8 ounces (View shipping rates and policies)
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item can be shipped to select countries outside of the U.S. Learn More
  • ASIN: B000AOA3PS
  • Item model number: KMC032
  • Average Customer Review: 4.7 out of 5 stars  See all reviews (79 customer reviews)
  • Amazon Best Sellers Rank: #17,772 in Sports & Outdoors (See Top 100 in Sports & Outdoors)

Customer Questions & Answers

Customer Reviews

Top Customer Reviews

Verified Purchase
I had this chain installed stock on my Tonino Lamborghini Motagna mountain bicycle. I have absolutely no complaints. The chain was absolutely excellent all the way through. I put over 4,000 miles into it. I'm talking about HARD riding, high gear, low cadence cycling. Tugging very hard. I had pegs on my mountain bike (Yes, it's unheard of, but I did it) and I used to ride my cousin around on trips of 20 miles and up, going up hills, and ripping it up. The chain never ever gave up.

I had to replace it after I bottomed out into a pot hole while racing down a hill at 37 MPH. The spokes caught the derailleur and ripped it clean off snapping the dropout hanger like a twig. I had to replace the derailleur and the hanger. The chain never broke though. It never even warped in the slightest.

I decided to change it because I didn't want to clean it when I replaced the rest of the drivetrain and I had already put in so many miles...

Of course, I replaced it with this same one.

Do keep in mind, you might want to change the chain more frequently than I did and be very observant of chain "stretch." I had to replace my SRAM cassette because the old chain "stretched" and the cogs on the shredded cassette weren't snugging with the new chain so I had to replace the SRAM cassette as well...

If you replace your chain and feel skipping when you tug, chances are there is a stiff link, or like in my case, the cassette is worn and you'll need to replace it as well.
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Verified Purchase
I've replaced hundreds of bicycle chains in my line of work. My opinion is that Sram and Shimano chains are not noticeably smoother or of any better quality, and are not worth paying roughly twice as much for. I prefer KMC's master links to Sram's master links, or Shimano's stupid rivet system.

When using a master link you can very easily take your chain off the bicycle for your monthly drive train cleaning. If you install the master link properly you will not have problems under load. I know this; because I operated a pedicab for a number of years. Pedicabs weight 180 lbs without a single passenger. Add 3 passengers to that, and you might start to get my point.

If you're busting chains under load. There is only one possible thing that can cause that. You're in to high of a gear and you're pedaling up an incline. All you need to do to stop this problem is to switch into a lower gear, probably on your left hand.

Please do not give this chain a 1 or 2 star review it deserves much better than that. KMC's Z51 has been a very loyal part in my shop for several years.
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Verified Purchase
The seller was Bike Towne. I paid about 10 bucks including shipping.

My old chain was still okay, but after almost 20 years of casual biking, I decided it was time to change it. I measured the old chain to determine how much it may have stretched; thankfully, it hadn't stretched (or at least it didn't stretch enough to be noticeable to me). To remove the old chain, I just broke it with pliers.

The new KMC chain was lightly oiled. It was longer than my original chain; a coworker who has bike tools was kind enough to shorten it for me; it was easy for him to remove the excess chain with the tool he had.

The new chain was very easy to install. I threaded it onto the cassette and the rear derailleurs, and then attached the master link. The master link fit so easily that I did not have to step on the pedal to lock it into place. My mountain bike is a 21 speed (7 gears in the back, 3 in the front).

Time will tell if the chain will hold-up as well as my prior chain. I'll update this review again as needed.
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Verified Purchase
Not the lightest, but comes lubed and scentless with a missing link of the two identical halves variety.

It shifts very silently and has so far not made any noise. Overall, it more than exceeded what I had been expecting for a chain this cheap.
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Verified Purchase
Was a perfect fit/replacement for my worn out chain. It did have a few more links than my old chain so had to remove those for it to fit properly but other than that, was perfect. Comes with the KMC "missing link" which is the master link to connect it together. I was used to the old fashioned master links but like this type much better and is very easy to connect and reconnect.
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Verified Purchase
This chain was pretty easy to install, even without a special tool for the master link. The special tool is recommended for opening and closing the master link. You must have a chain breaker tool, unless you are certain you won't have to shorten the chain to fit! If you are a klutz, you might want to get an extra master link just in case. Since I had to trim the chain to fit, the master link had to be opened three times. Being inexperienced, I just took out two links at a time, just to be safe. The instructions recommend replacing the master link after about three openings. Mine seemed robust after three times, so we are using it.
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Verified Purchase
My Giant Escape 3 is about 1 year old and started to make metal scrubbing noise. After doing online research and found out it is caused by stretched chain. A website says a chain should be replaced roughly every 2,000 miles. My Cyclometer APP indicates I rode at least 3,000 miles.
I bought Park Tool CT-5, which is a tool to disconnect chain link, along with this chain. KMC website posts instruction of chain replacement.
The replacement was easy, disconnect the old chain link, replace the chain and connect the new chain using missing link. You do not need tool to connect the missing link.
My bike stopped making the noise and gear shifting became smooth. I however found out the the cassette is extensively worn out and does not take the gear I used the most. I order a new cassette. Thank you KMC, vender and Amazon.
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KMC Z51 Bicycle Chain (6 & 7 Speed , 1/2 x 3/32-Inch)
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