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@EEI
^ That sucks. I actually wanted to upgrade to Open Corsas for the Zipps and use a proper valve extension where I can replace the core.
At the moment I use Sram ones and I can't pump them up well with my Lezyne pump (they're fine with my previous pump which broke down). I can pump them up with a hand pump but the end bit on my track pump doesn't want to go around the extension's tip. Am I doing something wrong or I'm retarder?