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I'm looking to get a new bike which will require the smallest amount of maintenance.

The bike will have an internally-geared hub and I have the choice of single speed chain or belt drive.

I have been looking at the Gates Carbon Drive and investigating maintenance costs: A CDX belt is around 8 times more expensive than a chain where I live. Also the chainring and rear sprocket are round 4 times more expensive.

What is the lifespan of a Gates belt against a Single Speed chain? I've looked up online but peoples opinions are conflicting. Some say in similar conditions a belt will have a similar lifespan, while others claim up to 10 times longer use. What is the actual lifespan of a belt compared to a well maintained single speed chain in similar conditions?

I understand a belt drive is not maintenance free but much less than a chain. If a belt can last 4 times longer than chain then I would consider this worth the investment.


Also is there an expected life difference between 11 speed and single speed chains? As comparison to my current bike.

  • 1
    Welcome to the site, James! You might like to check out our short site tour for some information about how things work here but everything looks good so far. – David Richerby Mar 22 '18 at 10:50
  • Note that different chains are reputed to have different life span in similar conditions. Certain people claim that a chain of brand "C" lived about three-four times longer than a chain made by vendor "K". – Grigory Rechistov Mar 22 '18 at 18:13
  • Even if the belt system lasts 4x longer, but costs 8x as much then its still more expensive than chains. – Criggie Mar 22 '18 at 19:09
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    If you go for the belt drive, please document your mileage and so on, and come back to this question with additional results. There's future searchers out there (like yourself) who would benefit from some accurate real-world numbers. – Criggie Mar 22 '18 at 19:15
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On single sped vs. 11 speed chains. A SS chain should last a lot longer than a derailleur chain. SS chains will have wider side-plates and therefore larger bearing surfaces. The big difference is that SS chains are run with the chain ring and sprocket aligned. Derailleur chains spend most of their time being run with the chain ring and sprocket offset so the chain has to cope with lateral forces.

  • Can I get a comment on the downvote? Do you disagree? – Argenti Apparatus Mar 22 '18 at 14:02
  • Perhaps the downvoter didn't notice that the question does explicitly ask for comparisons between derailleur and single-speed chains. – David Richerby Mar 22 '18 at 14:03
  • I have never heard of a chain using bearings, most use bushings, which wear and change the effective pitch of the chain (i.e., stretch). Also the side-plate width is different from the chain width. A wider chain will have wider bushings, which should wear slower. That said, this is not a guarantee as it also depends on the materials. Anecdotally, higher speed chains tend to use materials that wear better so there isn't much effective differences between chain widths, rather its the quality of the chain that seems to predict longevity. – Rider_X Mar 22 '18 at 16:48
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    I said bearing surface not ball bearing. Bushings are a type of bearing. – Argenti Apparatus Mar 22 '18 at 17:21
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I know this discussion is almost a year old, but maybe my experience will be helpful to someone. I’ve run a gates CDX belt on an AWOL with a shimano 11 spd internal hub for over 10,000 miles, much of that on wet or dusty trails. The front sprocket is aluminum and shows considerable wear, but the rear stainless sprocket and belt show very little visible wear. I’m getting ready to replace the hub (bad 6th gear), so I’ll also replace the front sprocket and belt. Who knows the belt may go another 10k, but I’ll let someone else do that test. Ease of maintenance sold me on the belt. No one asked, but what about tension? Don’t run a belt too tight, it will wear out your BB bearings (I’ve done that test). Too tight it will squeak and too loose it will slip. Just barely tight is what I would describe.

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    Welcome to Stack Exchange. A couple things I like about your answer are how you conveyed your experience with a belt drive system, which was very specific to the question, and including a maintenance suggestion---kind of an "insider's tip." As a suggestion for improvement (and a heads-up), answers that include links to references that support said answers seem to draw more upvotes, and rightly so. Even if you could offer a torque value to your "just barely tight" practical experience, that would substantially improve the answer. – Jeff Feb 26 at 3:06
  • What is an AWOL in this context? A brand or something else? – Criggie Feb 26 at 6:30

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