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I have a Specalized drink bottle holder and was always using normal 750ml plastic bottles, but they never fit very well. I was looking online for water bottles and now I'm wondering if all bottles that can be found online (e.g. on bikester.com) will fit into my holder or do I have to be careful with what I buy? Are there different sizes of bottles and holders or all they standardized?

Thank you in advance.

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    From my observation over the years, there is no standard (as is the case with most things bicyclic). They're "supposed" to hold 73 mm bottles. But bottles aren't standard either. – andy256 Aug 28 '15 at 10:29
  • plus all the "aero" bottles, and the oversize ones. But "standard" size is only roughly standard IME – Móż Aug 28 '15 at 12:26
  • I've never seen a "standard" bike bottle (not one of those water bottles sold to girls in tights doing Tai Chi) that wouldn't fit a standard bottle "cage". (There are, of course, some weird-shaped bike bottles which come with their own holders.) I have seen some special cages designed to hold pop bottles instead of bike bottles, etc, but those should be labeled, if you study the descriptions. – Daniel R Hicks Aug 28 '15 at 12:46
  • Some holders (e.g. Topeak Modula line) are adjustable. I've used them to carry Camelbak Podium Bigchill bottles, coke bottles and coke cans without problems just by adjusting the size. – Batman Aug 28 '15 at 13:07
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The inexpensive bottle cages can be bent to make them a little smaller for a tighter fit. If the type you have is a closed loop type you can add rubber bands to the bottle for a more secure fit if it is loose. There seems to be a lot more size variation with generic "sport bottles" than the bottles marketed to cyclists.

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