Deutsch English Français Italiano |
<vvpd8q$159o$1@dont-email.me> View for Bookmarking (what is this?) Look up another Usenet article |
Path: news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail From: bp@www.zefox.net Newsgroups: rec.bicycles.tech Subject: Re: Two stage tire pump? Date: Sun, 11 May 2025 05:40:42 -0000 (UTC) Organization: A noiseless patient Spider Lines: 22 Message-ID: <vvpd8q$159o$1@dont-email.me> References: <vvnqvu$3je8g$1@dont-email.me> <vvnroj$3jd92$1@dont-email.me> Injection-Date: Sun, 11 May 2025 07:40:44 +0200 (CEST) Injection-Info: dont-email.me; posting-host="6846ab7c1b526b8b27058e9cc87ff337"; logging-data="38200"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1+OWCFTs/V2EHbCmneshynRoO6GZCncs9M=" User-Agent: tin/2.6.4-20241224 ("Helmsdale") (FreeBSD/14.2-STABLE (arm64)) Cancel-Lock: sha1:jWAVolg/1V1V4pVUg3HqKhC9dI0= AMuzi <am@yellowjersey.org> wrote: > On 5/10/2025 10:22 AM, bp@www.zefox.net wrote: >> Are there any two-stage tire pumps on the market? I'm looking > Such exist: > > https://giyopumps.com/blog/what-is-a-2-stage-bike-pump/ If I'm reading right, that's a 2-mode pump, not 2-stage. The selector gives it away. A real 2-stage pump has no selector; the first stage delivers output to the second stage, the second stage delivers output to the receiver (tire, in this case). No need for a selector. If the first stage pressure exceeds that of the tire, the air just passes through the second stage. If the tire pressure is higher than the first stage delivers, the air pauses in the second stage to be compressed again on the return stroke. Thanks for writing, bob prohaska