We may have different Zefal pumps (I can't remember the size number of mine), but it fits well in my 58 cm Appaloosa. I just went with the sizing by measurement and Riv recommendation and have bounced it all over the place without incident. It may seem less secure than it actually is. On the other hand, I would have to agree with the poster who recommended the Silca, if you end up needing to buy something new...
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