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A First World Problem for sure, but ... I'd like to get a long pump to sit under the top-tube of my road bikes (as shoving a mini-pump in/under my rackless bag proved to be too much of a liability today).
None of the frames have pump-pegs, so I'll be relying on the slightly compressed pump spring holding it in place, but I'm relaxed about having a strap involved there too to help out.
As you'd [i]probably[/i] expect, given the question 😉 the bikes are skinny steel tubed 'day bikes', all use presta valves of course, (so there's no [i]particular[/i] need for any compromised multi-valve-type malarkey).
Like their compact brethern, I'm assuming any decent long pump is fine ... but is there anything else you can especially recommend / dissuade me from please. (I've got about 530mm space to sit it in, in case anything comes up in a particular size only, and I'd quite like something likewise skinny and in-keeping (ish)).
CO2 cartidges.
No need for pump then 🙂
Nay, nay and thrice nay.
Carrying a pump under the top tube involves knocking it off every time you pick the bike up by the top tube. This is not a cool thing.
The cool answer is to buy a pump long enough to sit alongside the left seat stay. It wedges in at the seat tube/seat stay end, then the bottom end is held secure by the quick release.
Like this:
[img] 
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my topeak master blaster is lovely. much better than the 20 year old raleigh thing that came with my 20 year old raleigh.
I have no other experience though...