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  1. #1
    Living the Dream
    Reputation: Alpenglow's Avatar
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    lezyne pump issues warning

    Just wanted to make folks aware of an issue I've found with my lezyne alloy drive mini pumps. The flex hose with threaded presta connection seems like a good idea until you realize that it removes threaded valve cores on presta stems. Really bad news with a tubeless setup.
    "And I shout that your all fakes and you should have seen the look on your face"

  2. #2
    Rogue Exterminator
    Reputation: kjlued's Avatar
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    Had a guy use my adapter for presta at the trail. In unscrewing it, the same thing happened.
    It seems any threaded presta valve can be a bad idea with tubeless. Of course not an issue with tubes.
    Just stick it in granny and start grinding.

  3. #3
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    I've been in the habit for years of just over-tightening the valve core with pliers on first use. Don't kill it in case you want to add more sealant later, but make it more than finger tight and there's not an issue

  4. #4
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    Purple Loctite. Problem solved.

  5. #5
    Plays with tools
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    This is a problem with all Leyzen pumps. The pump is virtually perfect except for that horrid **** show of a pump head. I cut the stock head off and replaced it with an SKS, smooth trouble free inflation ever since.

  6. #6
    Nouveau Retrogrouch SuperModerator
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    lezyne pump issues warning

    Quote Originally Posted by Alpenglow View Post
    Just wanted to make folks aware of an issue I've found with my lezyne alloy drive mini pumps. The flex hose with threaded presta connection seems like a good idea until you realize that it removes threaded valve cores on presta stems. Really bad news with a tubeless setup.
    I do not like any thread on tire pump head.
    mtbtires.com
    The trouble with common sense is it is no longer common

  7. #7
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    Quote Originally Posted by Raddamant View Post
    I've been in the habit for years of just over-tightening the valve core with pliers on first use. Don't kill it in case you want to add more sealant later, but make it more than finger tight and there's not an issue
    This has been my solution as well, it inspired me to buy one of those cool Stans valve core tools so I could easily (but firmly) tighten my valve cores down so that they would not back out when unthreading the Lezyne hose. Problem solved.

  8. #8
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    While I think this is a lesser issue than is being implied, Lezyne does make a presta-only hose for their handpumps with a slip fitting on one side. They are standard with the road drive pumps, but can be purchased separately here

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