MDI - Meidai Bicycle Pumps: Do you have one and do you love it? - The Chainlink2024-03-29T14:28:22Zhttps://thechainlink.org/forum/topics/mdi-meidai-bicycle-pumps-do-you-have-one-and-do-you-love-it?commentId=2211490%3AComment%3A1134264&x=1&feed=yes&xn_auth=noA quarter century old....walk…tag:thechainlink.org,2020-05-09:2211490:Comment:11372062020-05-09T21:45:59.995ZMatt M. 18.5KMhttps://thechainlink.org/profile/MattM
<p>A quarter century old....walked away from the pump 5 minutes ago and not losing air. I actually put a bleed valve on. Enjoy!<a href="https://storage.ning.com/topology/rest/1.0/file/get/4883354269?profile=original" target="_blank" rel="noopener"><img src="https://storage.ning.com/topology/rest/1.0/file/get/4883354269?profile=RESIZE_710x" class="align-full"/></a></p>
<p>A quarter century old....walked away from the pump 5 minutes ago and not losing air. I actually put a bleed valve on. Enjoy!<a href="https://storage.ning.com/topology/rest/1.0/file/get/4883354269?profile=original" target="_blank" rel="noopener"><img src="https://storage.ning.com/topology/rest/1.0/file/get/4883354269?profile=RESIZE_710x" class="align-full"/></a></p> Sorry....not on here much any…tag:thechainlink.org,2020-02-13:2211490:Comment:11342642020-02-13T02:25:08.702ZMatt M. 18.5KMhttps://thechainlink.org/profile/MattM
<p>Sorry....not on here much anymore... I just stuck one in-line on the hose itself with a brass T. The connection is solid but of course I went nuts and put a huge easy to read 200 PSI industrial gauge on because I have been squinting to see the numbers on bike pump pressure gauges since I was 10 - and I have never really needed glasses or even reading glasses. You know what I mean.</p>
<p>As far as the overflow canister - I just left it alone. I never moved past that point. I really…</p>
<p>Sorry....not on here much anymore... I just stuck one in-line on the hose itself with a brass T. The connection is solid but of course I went nuts and put a huge easy to read 200 PSI industrial gauge on because I have been squinting to see the numbers on bike pump pressure gauges since I was 10 - and I have never really needed glasses or even reading glasses. You know what I mean.</p>
<p>As far as the overflow canister - I just left it alone. I never moved past that point. I really wanted to get my hands on more than my pump in the photos also but I never got further than that either.</p>
<p>Really nice choice with the Meidai Top Super!! Use the NPT threading I quoted if you want to get fancy with a new hose barb (which I'm almost certain should work - but carefully thread the barb in before you tighten it down) and the Thermoid Valuflex or any 1/4" air hose.</p>
<p>Good luck and have fun!</p> Hi Matt, I'm revisiting this…tag:thechainlink.org,2020-01-27:2211490:Comment:11342012020-01-27T14:04:12.348ZRobin Blackhttps://thechainlink.org/profile/RobinBlack
<p>Hi Matt, I'm revisiting this post as I recently found a Medai at a thrift store I'm going to rebuild, and I'd love your feedback as you seem to have developed a serious expertise about these pumps! I sent you a private message. I also have an SKS I purchased this fall for $15- based on my research it's over 50 years old and still going! Same thing as the Medai, I'm going to rebuild as well- new hose, repaint the base, etc. </p>
<p>The Medai is going to need a new hose, and I am going to try…</p>
<p>Hi Matt, I'm revisiting this post as I recently found a Medai at a thrift store I'm going to rebuild, and I'd love your feedback as you seem to have developed a serious expertise about these pumps! I sent you a private message. I also have an SKS I purchased this fall for $15- based on my research it's over 50 years old and still going! Same thing as the Medai, I'm going to rebuild as well- new hose, repaint the base, etc. </p>
<p>The Medai is going to need a new hose, and I am going to try to either run a pressure gauge off the base bar threat with a t-junction, or maybe even drill, tap, and run one on top of the overflow canister. Either way, I'd appreciate your advice!</p>
<p><a href="https://storage.ning.com/topology/rest/1.0/file/get/3835813336?profile=original" target="_blank" rel="noopener"><br/><img src="https://storage.ning.com/topology/rest/1.0/file/get/3835813336?profile=RESIZE_710x" class="align-full"/></a></p>
<p><a href="https://storage.ning.com/topology/rest/1.0/file/get/3835814694?profile=original" target="_blank" rel="noopener"><img src="https://storage.ning.com/topology/rest/1.0/file/get/3835814694?profile=RESIZE_710x" class="align-full"/></a></p> ...there might be a small hei…tag:thechainlink.org,2018-11-21:2211490:Comment:11101812018-11-21T02:07:16.610ZMatt M. 18.5KMhttps://thechainlink.org/profile/MattM
<p>...there might be a small height difference between the old and new washer though.....swapping on the new housing will fix this....or just use the new chuck...the new hose is really trash.</p>
<p>...there might be a small height difference between the old and new washer though.....swapping on the new housing will fix this....or just use the new chuck...the new hose is really trash.</p> Just get a new thumb lock hos…tag:thechainlink.org,2018-11-21:2211490:Comment:11100782018-11-21T01:46:59.670ZMatt M. 18.5KMhttps://thechainlink.org/profile/MattM
<p>Just get a new thumb lock hose and swap in the washer. Ebay Item <a href="https://www.ebay.com/itm/Bicycle-Pump-Hose-24-Steel-Thumb-Lock-Schrader-Hose-NEW/232988258580?hash=item363f2eb114:g:SLEAAOSwv0tVTKQV" target="_blank" rel="noopener">232988258580</a><span>. Worked great on mine: this is exactly the same part I used.</span></p>
<p>Just get a new thumb lock hose and swap in the washer. Ebay Item <a href="https://www.ebay.com/itm/Bicycle-Pump-Hose-24-Steel-Thumb-Lock-Schrader-Hose-NEW/232988258580?hash=item363f2eb114:g:SLEAAOSwv0tVTKQV" target="_blank" rel="noopener">232988258580</a><span>. Worked great on mine: this is exactly the same part I used.</span></p> Anyone know if replacement ru…tag:thechainlink.org,2018-11-20:2211490:Comment:11100552018-11-20T02:45:28.631ZCLIFTON CHANGhttps://thechainlink.org/profile/CLIFTONCHANG
<p>Anyone know if replacement rubber for the head is available anywhere? There is a picture of it below. Thank you.<a href="https://storage.ning.com/topology/rest/1.0/file/get/135870128?profile=original" target="_blank" rel="noopener"><img src="https://storage.ning.com/topology/rest/1.0/file/get/135870128?profile=original" class="align-full"/></a></p>
<p>Anyone know if replacement rubber for the head is available anywhere? There is a picture of it below. Thank you.<a href="https://storage.ning.com/topology/rest/1.0/file/get/135870128?profile=original" target="_blank" rel="noopener"><img src="https://storage.ning.com/topology/rest/1.0/file/get/135870128?profile=original" class="align-full"/></a></p> I really think this is my l…tag:thechainlink.org,2018-03-29:2211490:Comment:10930772018-03-29T00:31:51.518ZMatt M. 18.5KMhttps://thechainlink.org/profile/MattM
<p><a href="http://storage.ning.com/topology/rest/1.0/file/get/35278582?profile=original" target="_self"></a><a href="http://storage.ning.com/topology/rest/1.0/file/get/35278518?profile=original" target="_self"><img class="align-left" src="http://storage.ning.com/topology/rest/1.0/file/get/35278518?profile=RESIZE_1024x1024" width="721"></img></a> <a href="http://storage.ning.com/topology/rest/1.0/file/get/35278582?profile=original" target="_self"></a></p>
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<p><strong>I really think this is my last post on the Chainlink for MDI pumps.</strong> On the left (at 92mm mark) in the photo above is my original MDI…</p>
<p><a href="http://storage.ning.com/topology/rest/1.0/file/get/35278582?profile=original" target="_self"></a><a href="http://storage.ning.com/topology/rest/1.0/file/get/35278518?profile=original" target="_self"><img width="721" src="http://storage.ning.com/topology/rest/1.0/file/get/35278518?profile=RESIZE_1024x1024" width="721" class="align-left"/></a><a href="http://storage.ning.com/topology/rest/1.0/file/get/35278582?profile=original" target="_self"></a></p>
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<p><strong>I really think this is my last post on the Chainlink for MDI pumps.</strong> On the left (at 92mm mark) in the photo above is my original MDI hose barb. In the middle (at 113mm center mark) is an "Action" replacement hose threading. On the right (at 130mm mark) is an 1/8" NPT swivel connector for pipe. My original MDI barb still works on my pump after using the 1/8" NPT connector for over a year (as does the entire assembly). Please use the metric ruler for reference. If the "Action" replacement hose threading works on an MDI pump, please let me know which one it will fit on. There are two MDI Top Super pumps in a local bike shop near my home which also have the same threading as mine and this leads me to believe the "Action" replacement hose is not appropriate for many MDI bicycle pumps.</p>
<p><em>Additional information from the past few days:</em></p>
<p>From BikeForums - the <a rel="nofollow noopener" href="https://www.topeak.com/global/de/products/upgrade-kits/223-smarthead--upgrade-kit" target="_blank">Topeak Smarthead Upgrade kit</a>. Will it work??? We would all like to know. I considered purchasing this at the beginning of my project in 2016, but I decided that the Topeak would not be as nice as having my MDI thumblock back, especially when combined with a Silca presta chuck.</p>
<p>If you are fighting with your MDI because it doesn't hold air either the air check valve has failed in your pump (which is something I'm not even sure really exists) or your hose has some kind of issue. I suppose a <a rel="nofollow noopener" href="http://www.viaircorp.com/fittings/checkvalves/" target="_blank">VIAIR 92823</a> check valve might be a solution to the problem but this is something I'm still investigating (it's the one with the red thread compound on it).</p> https://www.bikeforums.net/bi…tag:thechainlink.org,2018-03-24:2211490:Comment:10927092018-03-24T20:24:09.445ZMatt M. 18.5KMhttps://thechainlink.org/profile/MattM
<p><a href="https://www.bikeforums.net/bicycle-mechanics/316914-meidai-top-super-pump-parts-2.html" target="_blank">https://www.bikeforums.net/bicycle-mechanics/316914-meidai-top-super-pump-parts-2.html</a></p>
<p></p>
<p>"Hello - - - I fully investigated all options for repairing my CyclePro MDI - please see my article on The Chainlink - [U]MDI - Meidai Bicycle Pumps: Do you have one and do you love it?[/U]. Here is the short version: Threading for the pump hose to the base is 9.5mm coarse…</p>
<p><a href="https://www.bikeforums.net/bicycle-mechanics/316914-meidai-top-super-pump-parts-2.html" target="_blank">https://www.bikeforums.net/bicycle-mechanics/316914-meidai-top-super-pump-parts-2.html</a></p>
<p></p>
<p>"Hello - - - I fully investigated all options for repairing my CyclePro MDI - please see my article on The Chainlink - [U]MDI - Meidai Bicycle Pumps: Do you have one and do you love it?[/U]. Here is the short version: Threading for the pump hose to the base is 9.5mm coarse thread (according to Yellow Jersey) but 1/8" NPT pipe threading works fine and does not cross-thread, strip out, or loosen when tightened. You can find 1/8" NPT threaded hose barbs, pipe, etc. at many hardware stores, Home Depot, etc.</p>
<p>If the Pyramid / Sunlite Model M / Yellow Jersey after market replacement hoses aren't a good match for you, or simply too cheaply made, you can step up to Silca's Replacement Hose with clamps kit with 3/16" inside diameter and 7/16" outside diameter or to HBD Thermoid VALUFLEX/GS rated at 250 PSI with 3/16" inside diameter and 7/16" outside diameter from McMaster Carr (item # 5304K42). In order to use Silca's kit or the Valuflex tubing you need to upgrade your hose barb to make sure the hose stays put on the pump - this can be a 3/16" hose X 1/8" NPT steel barb or stainless steel barb. You may also use a 3/16" hose X 1/8" NPT brass hose barb to connect to the pump base but you have to keep it away from moisture and grease the threads before installation because brass connected to steel will rust. If you decide against Silca's kit and purchase the Valuflex tubing instead, be sure to purchase Oetiker stainless steel clamps (known also as pinch clamps and ear clamps) McMaster Carr (item # 5435K12) .</p>
<p>Lastly, if the head of the hose where you attach the valve isn't working you may replace it with a variety of options available from Silca or other manufacturers, but if you want to hang on to the original MDI part you may rebuild it with parts from other hoses. I used the head from Monarch Bicycles on Ebay; the item number for this hose on Ebay always changes but the auction title is always the same "Bicycle Pump Hose 24" Steel Thumb Lock Schrader Hose NEW!" (Monarch is not currently selling on Ebay, though...) . The "Sunlite Universal Thumb Lock Hose End" on Amazon item number B00629RMZE is a bit cheaper and it's likely you only really need the washer in the head (which clamps on to your tire valve) and perhaps the housing to keep your old MDI head going - I haven't tried it but for $6.25 and free shipping it seems like it's worth a try.</p>
<p>But there are some advantages to moving to 1/4" inside diameter hose since that is most common in auto shops. The following from Lumiteco is a 1/4" inside diameter hose head with steel thumb lock is Amazon.com item B076F2PL5H " 1/4"Lock On All Metal Air Chuck,Mini Air Compressor Portable Tire Inflator Tire Chuck, Hose End with Barb Connector for Hose Repair Inflate Chuck--2Pack". It may be the Lumiteco head also has all the parts you need, save for the 1/4" barb, to repair your MDI head. Also I have become a huge fan of the air chucks with steel lock for 1/4" from Interstate Pneumatics (specifically the T02 - Amazon item B011LBZQ7I ) since it works beautifully with my Presta head from Silca resulting in no pressure loss on my MDI bicycle pump. Bear in mind that moving to 1/4" hose means you need a 1/4" hose barb and slightly larger pinch or ear clamps unless you are happy with getting standard hose clamps from the hardware store.</p>
<p>As far as the leather pump washer, or "cup packing", which is housed inside the cylinder of your pump (it's what puts air through the pressure gauge and the pump hose), there are a couple of options as discussed in BikeForums and elsewhere. 1. (This first one is from my article on The Chainlink) Buy one from Silca - it's could be the Silca 741 (30mm diameter) but measure your pump cylinder before you order (the dimension for my MDI pump cylinder is 29.8mm and I am using the Silca 741 - it's great). 2. Find one somewhere- - sometimes they show up on Ebay. 3. Contact Monarch-McLaren, Ltd. in Wisconsin and have them make a couple of them for more than you probably care to pay. 4. Make your own- you might learn a new skill! You MUST use Silca's Pump Blood to install a new pump washer or it will crack and become useless. I also think a combination of leather conditioner and some light oil would do as people have been using this solution for many years. Clearly no lubricant which will clog the pump's airways should ever be used to install the pump washer.</p>
<p>Happy Cycling,</p>
<p>Matt M"</p> I finally found an inexpensiv…tag:thechainlink.org,2017-08-06:2211490:Comment:10709332017-08-06T18:45:01.059ZMatt M. 18.5KMhttps://thechainlink.org/profile/MattM
<p><span>I finally found an inexpensive but well made close relative to the Continental Tubing from SILCA - - 3/16" ID 250 PSI tubing sold at $0.60 per foot, 7/16" OD, Thermoid VALUFLEX/GS </span><a href="https://www.mcmaster.com/#5304k42/=18tq3p8" rel="nofollow" target="_blank">McMaster SKU 5304K42</a><span> - made in Ohio, USA. These dimensions are identical to the tubing in SILCA's kit. I edited the discussion heading above to reflect this discovery (or rediscovery because I just don't…</span></p>
<p><span>I finally found an inexpensive but well made close relative to the Continental Tubing from SILCA - - 3/16" ID 250 PSI tubing sold at $0.60 per foot, 7/16" OD, Thermoid VALUFLEX/GS </span><a rel="nofollow" href="https://www.mcmaster.com/#5304k42/=18tq3p8" target="_blank">McMaster SKU 5304K42</a><span> - made in Ohio, USA. These dimensions are identical to the tubing in SILCA's kit. I edited the discussion heading above to reflect this discovery (or rediscovery because I just don't remember if I saw it when I started the discussion / project). I doubt you'll find anything else close to it or better than Thermoid Valuflex unless you order through SILCA.</span></p> New Ebay Item # 382124648049…tag:thechainlink.org,2017-06-27:2211490:Comment:10632082017-06-27T02:18:30.711ZMatt M. 18.5KMhttps://thechainlink.org/profile/MattM
<p>New Ebay Item # 382124648049 and now only $7.62 with shipping included.</p>
<p>New Ebay Item # 382124648049 and now only $7.62 with shipping included.</p>