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  1. #1
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    Tubes for 40 MM Tires

    Anyone happen to know of a tube that can be used with a 40MM tires that has a smooth valve? Because I'd rather not threaded if it can be avoided.

    It seems all the bigger ones are threaded. I'm not at all hesitant to use a smaller tube that, on paper, won't work with a 40 but I'm afraid something that tops out at 25mm might be pushing it with a 40mm tire. Although I have used 23mm tubes with 35mm tires so maybe I'll try it.

    I did find some 38mm zipp tubes but the valve is shorter than I want and it sounds like they went weight weenie on the stems which sounds stupid to me if that at all impacts durability and function. (see description below)


    "is designed to improve rotational stability by decreasing rotational mass at the valve body. It features a lightweight, smooth aluminum Presta-valve body, 37 mm length with a removable valve core."

  2. #2
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    Here's a couple but only rated into the 30's.

    25-35 with smooth 48mm valve

    https://www.amazon.com/Diamondback-7...x38c+bike+tube

    These are 25-32 with a smooth 40mm valve.

    https://www.amazon.com/Michelin-Airs...CJ823MQVWGNQ6M

    I don't know about the diamondback tubes but I've been using, and happy with, Michelin tubes for a number of years now. In 700c only up to 25mm's but in my 650b wheels I've used Michelin tubes in both 650b and 26" rated for 40mm tires to good effect.

    I have used 700X25 Michelin tubes in my wifes wheels with 32mm tires mounted and that works just fine. And she rides "heavy". I'll trust you not to mention to her that I said that.
    Too old to ride plastic

  3. #3
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    I got to thinking about this since writing the last post and came up with a maybe.

    Like I said, I've used 26" tubes in my 650b with no issue. That's 559 ETRTO in place of 584 ETRTO. It's a bigger difference, but maybe you could try a 650b(27.5) tube in your wheel. 584 ETRTO in place of 622 ETRTO.

    https://www.modernbike.com/michelin-...27.5-x-1.9-2.6

    https://www.ebay.com/itm/Kenda-650b-...MAAOSwNURbRyrI
    Too old to ride plastic

  4. #4
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    Thank you. Both are what I want and didn't turn up in my search so I appreciate it.

    Another option in case anyone else is looking for the same thing is: https://www.excelsports.com/main.asp...jor=1&minor=31

    They are latex though. I like and use latex tubes on my road bike but the 40mm tires bike in addition to gravel and trail rides gets used almost daily during the week sometimes just for quick grocery runs so I don't want to have to pump up every ride with that bike. They'd be a great option for those using bigger tires just for performance type ride and not frequent utilitarian rides though.

  5. #5
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    Quote Originally Posted by velodog View Post
    I got to thinking about this since writing the last post and came up with a maybe.

    Like I said, I've used 26" tubes in my 650b with no issue. That's 559 ETRTO in place of 584 ETRTO. It's a bigger difference, but maybe you could try a 650b(27.5) tube in your wheel. 584 ETRTO in place of 622 ETRTO.

    https://www.modernbike.com/michelin-...27.5-x-1.9-2.6

    https://www.ebay.com/itm/Kenda-650b-...MAAOSwNURbRyrI
    Thanks. I hadn't seen this when I first responded. The first two you posted should work but I'll look into what you're saying here if I have problems with one of those (likely the Diamonback).

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