http://citycyclingedinburgh.info/bbpress/ CityCyclingEdinburgh Forum » Topic: CO2 pumps en Wed, 13 May 2026 05:16:29 +0000 http://citycyclingedinburgh.info/bbpress/topic.php?id=15768&page=2#post-205961 Fri, 04 Dec 2015 00:15:42 +0000 Neil 205961@http://citycyclingedinburgh.info/bbpress/ <p>Yeah....actually, thinking about it, 80 psi isn't even the minimum recommended pressure... </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=15768&page=2#post-205956 Thu, 03 Dec 2015 23:50:33 +0000 Snowy 205956@http://citycyclingedinburgh.info/bbpress/ <p>I am done with mini pumps. Inflating a 2.5" mtb tyre ten times to get me home last week was unbelievably frustrating. From now on if I've got a pannier on the mtb, I'm carrying a long pump. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=15768&page=2#post-205940 Thu, 03 Dec 2015 23:03:00 +0000 Neil 205940@http://citycyclingedinburgh.info/bbpress/ <p>Finally got round to testing the micro pressure drive. I'd read somewhere that the end of the chain breaker on the Lezyne sv10 multitool doubled as a valve core wrench to tighten valve cores. I tried this and it was possible to tighten the valve core further. I completely deflated the tyres- it took 300 strokes to get the 25c tyres to 80 psi, mostly pretty easy and quick but the last 100 were getting tough. Probably could have done more- not sure how many would have been needed to get to 100'ish? I guess it was &gt;80 since that was what my main pump read once I had disconnected the minipump and attached the other pump. Pressed the abs button and unscrewed the hose from the pump before unscrewing the hose from the valve. There was a tiny hiss when i pressed the abs button. Valve core stayed put with no hint of movement. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=15768&page=2#post-205066 Fri, 20 Nov 2015 14:26:42 +0000 acsimpson 205066@http://citycyclingedinburgh.info/bbpress/ <p>I just checked and it is in fact the pressure drive not the road drive I have too. In the worst case scenario I have considered leaving the pumps flexible tube lashed to a spoke after loosing the valve core but on giving it one last try it stuck.</p> <p>Next time I will know to release the pressure first. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=15768&page=2#post-205059 Fri, 20 Nov 2015 13:52:57 +0000 amir 205059@http://citycyclingedinburgh.info/bbpress/ <p>The Topeak Road Morph pump is really good. I've had a couple for many years and they've not let me (or my tyres) down. It's rated as able to do 160 psi and has a wee pressure gauge (has to be better than the finger test). I use it for short rides and long distance audaxes. It's so easy to use you could almost dump your track pump.</p> <p>I'm not sure that it's quite a mini-pump (though Wiggle does classify it as such) but it's very transportable. It would stick quite a way out of a jersey pocket but I keep mine either on the frame or in the saddle bag - saves forgetting it. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=15768&page=2#post-205058 Fri, 20 Nov 2015 13:36:43 +0000 kaputnik 205058@http://citycyclingedinburgh.info/bbpress/ <p>The Road Drive will do 100psi on a 700x23 tyre. Given it's entirely constructed out of aluminium and metal, you can fair feel the thing heat up with the effort of compression. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=15768&page=2#post-205029 Fri, 20 Nov 2015 09:34:44 +0000 Neil 205029@http://citycyclingedinburgh.info/bbpress/ <p>Just Googled this and the abs button is supposed to prevent this happening- just have to remember to press it before unscrewing the pump. Just like I need to remember to use the quick release on the braked before I try to remove the wheel (one of my many mental blocks)... </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=15768&page=2#post-205026 Thu, 19 Nov 2015 23:32:17 +0000 Neil 205026@http://citycyclingedinburgh.info/bbpress/ <p>It's the pressure drive mini abs I have, not road drive. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=15768#post-205023 Thu, 19 Nov 2015 22:51:51 +0000 Neil 205023@http://citycyclingedinburgh.info/bbpress/ <p>Hmmmm must practice then....I vaguely remember watching a Lezyne youtube video that showed how to use their multitool (which i also have) to tighten the valve core before attaching the pump...</p> <p>What psi do you think you can you reasonably reach with the micro (with 25c) tyres? It wasn't that difficult at all to get &gt;80psi with the Topeak </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=15768#post-205020 Thu, 19 Nov 2015 22:47:26 +0000 gembo 205020@http://citycyclingedinburgh.info/bbpress/ <p>I have lezyne too. Can pull the top of the valve out, so watch out (you can just put it back in but it is a faff) </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=15768#post-205019 Thu, 19 Nov 2015 22:47:00 +0000 kaputnik 205019@http://citycyclingedinburgh.info/bbpress/ <p><em>I read there a risk with the screw on attachment of accidentally removing a valve core?? </em></p> <p>Oh yeah, if you have removable valve cores, make sure you tighten them tighter than the factory tightness, I've had the insta-deflate experience before with it. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=15768#post-205018 Thu, 19 Nov 2015 22:45:41 +0000 Snowy 205018@http://citycyclingedinburgh.info/bbpress/ <p>Cheaper but also high-pressure and highly robust is the Topeak Pocket Rocket. Sale price at <a href="http://www.wiggle.co.uk/topeak-pocket-rocket-pump/">Wiggle</a> just now.</p> <p>Though I have to say that after the recommendations above, I'm highly tempted to try out cartridges...! </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=15768#post-205017 Thu, 19 Nov 2015 22:42:57 +0000 Neil 205017@http://citycyclingedinburgh.info/bbpress/ <p>Good to hear the Lezyne recommended....I bought one (the micro) to replace a broken Topeak but not actually used it yet. Really must try it out at home before I have to use it in anger- no idea how long it would take to pump up to a usable psi and I read there a risk with the screw on attachment of accidentally removing a valve core?? </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=15768#post-205007 Thu, 19 Nov 2015 19:51:24 +0000 acsimpson 205007@http://citycyclingedinburgh.info/bbpress/ <p>+1 for the road drive. Solidly built and as Kaputnik will handle the pressure if you really need more than "enough to get you home" psi. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=15768#post-205003 Thu, 19 Nov 2015 18:24:25 +0000 Dave 205003@http://citycyclingedinburgh.info/bbpress/ <p><em>I'm not convinced by the weight saving but it's the convenience factor that pushed me to them.</em></p> <p>+1 my gateway was last winter, when I had a Revolution mini pump on the saddle bag but chucked in a CO2 cartridge just to save me spending ages freezing my hands off in the snow. It will even blast up a chunky studded Marathon to enough-to-limp-home pressure in half a second. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=15768#post-204997 Thu, 19 Nov 2015 17:57:25 +0000 kaputnik 204997@http://citycyclingedinburgh.info/bbpress/ <p><em>Any decent mini pumps that you'd HIGHLY recommend?</em></p> <p>Lezyne Road Drive. It's screw-on rather than clamp on, some people don't like that but personally it's the whole reason I got it; no more fighting to get the thing to bind on different valve neck designs, no chance of ripping the valve out and just plain easier to hold the pump at a useful angle and position for the hard work of pumping. Will do 100-110psi, although I found I had to take mine apart once and reassemble with replacement (and greased) seals as although the component quality was great, assembly wasn't up to the same scratch. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=15768#post-204996 Thu, 19 Nov 2015 17:40:53 +0000 Edinburgh Cycle Training 204996@http://citycyclingedinburgh.info/bbpress/ <p>Thanks everyone. Defo food for thought.</p> <p>Any decent mini pumps that you'd HIGHLY recommend? </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=15768#post-204984 Thu, 19 Nov 2015 15:53:26 +0000 Murun Buchstansangur 204984@http://citycyclingedinburgh.info/bbpress/ <p>I found an unexpected benefit of CO2 the other weekend on the Innocent path - had a 'quick' puncture (tyre completely flat before I came to a halt). Didn't have a spare tube with me so patched it and inflated with canister - at half pressure I could hear the unmistakable sound of gas rapidly escaping - patch mustn't have taken fully. Decided to press on quickly and the quick addition of pressure must have clamped the patch against the tyre and the repair has held ever since, probably well cured now. Not sure I'd have managed that with a hand pump. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=15768#post-204978 Thu, 19 Nov 2015 14:39:56 +0000 deckard112 204978@http://citycyclingedinburgh.info/bbpress/ <p>I'm not convinced by the weight saving but it's the convenience factor that pushed me to them. Particularly in winter when inflating a tyre in literally a couple of seconds if far more preferably to hammering away with a mini pump for ages. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=15768#post-204901 Wed, 18 Nov 2015 17:43:08 +0000 amir 204901@http://citycyclingedinburgh.info/bbpress/ <p><em>Or you don't want the assembled waiting persons entertaining themselves by critiquing your tyre-fixing skills or bicycle riding fashion sense ;) </em></p> <p>Don't worry, @kaputnik, you've been judged :) </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=15768#post-204897 Wed, 18 Nov 2015 17:37:20 +0000 fimm 204897@http://citycyclingedinburgh.info/bbpress/ <p>"<em>Anyway, just how much lighter is an inflator plus 2 or 3 cartridges than a semi-decent track pump?</em>"<br /> A lot?<br /> Unless you can get track pumps that are significantly smaller than ours!<br /> Boyfriend of Fimm has used CO2 in triathlons. I've never tried them. My understanding is that they are quicker. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=15768#post-204896 Wed, 18 Nov 2015 17:28:28 +0000 kaputnik 204896@http://citycyclingedinburgh.info/bbpress/ <p><em>Good too for sportives and club rides when you don't want to keep people waiting.</em></p> <p>Or you don't want the assembled waiting persons entertaining themselves by critiquing your tyre-fixing skills or bicycle riding fashion sense ;) </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=15768#post-204892 Wed, 18 Nov 2015 16:59:40 +0000 Cyclingmollie 204892@http://citycyclingedinburgh.info/bbpress/ <p>They were great when mini pumps weren't able to put more than 60-70psi into a tyre. Good too for sportives and club rides when you don't want to keep people waiting. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=15768#post-204891 Wed, 18 Nov 2015 16:59:39 +0000 Klaxon 204891@http://citycyclingedinburgh.info/bbpress/ <p>Aluminium, so recyclable, but single use. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=15768#post-204890 Wed, 18 Nov 2015 16:54:33 +0000 unhurt 204890@http://citycyclingedinburgh.info/bbpress/ <p>Are the empties refillable/recyclable? </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=15768#post-204889 Wed, 18 Nov 2015 16:49:16 +0000 kaputnik 204889@http://citycyclingedinburgh.info/bbpress/ <p>CO2 is denser than atmospheric air, therefore tyres pumped up to the same pressure will be heavier when filled with CO2 than with air. -1 for the weight weanies. </p> <p>Anyway, just how much lighter is an inflator plus 2 or 3 cartridges than a semi-decent track pump? </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=15768#post-204882 Wed, 18 Nov 2015 16:17:27 +0000 wingpig 204882@http://citycyclingedinburgh.info/bbpress/ <p>Carbon dioxide molecules can dissolve their way through (butyl) inner tubes, whereas oxygen and nitrogen molecules have to physically batter their way out. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=15768#post-204878 Wed, 18 Nov 2015 16:01:25 +0000 Nelly 204878@http://citycyclingedinburgh.info/bbpress/ <p>@amir</p> <p>I usually blow up the new tube with my mouth before seating it.....but I might be odd that way !</p> <p>One cartridge = one road tyre to very hard. I guess you could use less?</p> <p>Also, even when you pump up using CO2, you still need to use the track pump when you get home, because the tube will have lost some CO2 by the next day and feel softer (I'm sure a scientifically minded person could explain why). </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=15768#post-204875 Wed, 18 Nov 2015 15:34:18 +0000 amir 204875@http://citycyclingedinburgh.info/bbpress/ <p>A couple of queries for users:</p> <p>- can you pump up the inner-tube a little bit, as you should do before fitting it in the tyre?</p> <p>- how many refills = one pump? I only ask because sometimes on a ride you need to deal with multiple p****s (not usually me cross fingers) </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=15768#post-204862 Wed, 18 Nov 2015 13:55:40 +0000 Cyclingmollie 204862@http://citycyclingedinburgh.info/bbpress/ <p>Years ago my daughter screwed the adapter onto a threaded cartridge and got such a shock when it started hissing that she ran to the back door and threw it into the back garden. Took ages to find. </p>