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I have some lights and a cycle computer that attach using some sort of rubber or silicone bands (or O rings - don't know what they are called). I need some replacements, but I don't know what they are called!

Best I can find on (say) Amazon are O rings that look the same but seem to be only for plumbing - not long term daily use on a bicycle.

I need various sizes as I want to move stuff between bikes - which have differing tube/handle bar diameters.

The technically right name - or a recommended supplier - would be most welcome!

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    You can get a set of common plumbing o-rings for not much money in a shop selling plumbing supplies. They work quite well, but aren't as stretchy as the ones that come with the lights, so you need to be a little more careful choosing the size. – Chris H Mar 8 '17 at 14:13
  • Depending on the length, consider shopping in the ladies' hair care aisle of your local drug store or department store. I found some nice silicone-like hair bands that are maybe 5" in circumference, perhaps 3/16" thick, and quite stretchy. Very durable too. – Daniel R Hicks Mar 8 '17 at 20:23
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    Easy to find on EBay - go to bicycles/lights section and type in 'ring'. O Rings - the ubiquitous rubber rings used in everything are not as stretchy so you need to get a closer sized fit and won't last as long, but are available at any auto or hardware shop. O Rings also don't have the little tag making it easy to take the light off. – mattnz Mar 8 '17 at 20:25
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They are usually referred to as O-Rings

Typing O ring bicycle into Google will give you plenty of options.

Depending where in the world you are would depend on where you can get them from in the UK you can get them from Halfords or LBS.

Here are some from Cateye

Here are some from Garmin

Amazon have a variety of different bands

I doubt materially the ones from a hardware store would be much different but the cycling ones would be designed to go around the standard handlebar / stem diameters. It might therefore be a bit hit and miss with some from a hardware store, i.e. too small, too big, not stretchy enough.

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    Are these any different than what you would find in the plumbing section of the hardware store? Seems like it would be cheaper and easier to get the same thing at the hardware store if they are indeed the same thing. – Kibbee Mar 8 '17 at 14:18
  • @Kibbee no idea, I'm not a plumber. I doubt materially they would be much different but the cycling ones would be designed to go around the standard handlebar / stem diameters. Might be a bit hit and miss with some from a hardware store. – Cearon O'Flynn Mar 8 '17 at 14:19
  • The hardware store ones might not last as long (thinner & less stretchy, so prone to cracking), but I'm more likely to lose than break them anyway and I'm sure I'm not alone in that. So I'd go for the cheaper option, but in a variety pack (and have) (@Kibbee) – Chris H Mar 8 '17 at 16:29
  • O-rings are industrial & normalized items. I doubt that any accessory providing companies have their own production line. globaloring.com/Downloads/… – Carel Mar 8 '17 at 19:41
  • My goto place for such things would be ebay or aliexpress. Search for "O-Ring rubber bicycle". – Greg Apr 5 at 8:10
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Have you thought about cutting an old inner tube across its length. Various thicknesses of cut give more or less stretch. Rubber versus latex, too many different size tubes to mention. Cheap as chips and your LBS will have an endless supply.

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O-rings made of Silicon/Silicone are typically orange in color. Are your o-rings orange? Are these use in a outdoor application?

Reason I ask is typical o-ring you will find in home depot or a plumbing supply house are OK they will crack over time due to ozone exposure.

Neoprene or silicone o-rings work best for those types of applications. You can purchase small quantities from the company here at https://www.alliedmetrics.com/seals/o-rings/

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