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  1. #1
    RoadBikeReview Member
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    Maximum tubeless clincher tire pressure for hookless rims?

    It's hard to find road rims, carbon or alloy, below about 400g. On the mountain-biking side, though, there are plenty of options, some even below 300g. Are any of these acceptable for road use?

    Maximum acceptable pressure seems to vary with tire width. ENVE has a sliding scale for their Twenty9 XC rims (hooked, i18, 375g):

    https://enve.zendesk.com/hc/en-us/ar...ountain-Wheels

    Easton has a similar sliding scale:

    https://www.eastoncycling.com/media/...20pressure.pdf

    While they mention tubeless, they don't give a different set of numbers for it. Nor does the chart differentiate between hooked and hookless (or carbon and alloy), though they show a cross-section of a hooked rim.

    https://www.lightbicycle.com/bead-ho...ompatible.html

    LB says 40 PSI max for this hookless without listing a tire size.

    More recently, Hunt has come out with hookless road rims:

    https://www.huntbikewheels.com/blogs...rims-explained

    They're a little cagey about what makes them different from any other hookless rims.

    I see two failure modes for excessive pressure: the rim breaks or the tire blows off. The first seems improbable (the lateral force on the rim from a low-volume tire at high PSI should be similar to a high-volume tire at low PSI). The second, I don't know.

    Has anyone tried a hookless "mountain bike" rim with a tubeless road tire?

  2. #2
    RoadBikeReview Member
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    Quote Originally Posted by alexdi View Post
    It's hard to find road rims, carbon or alloy, below about 400g. On the mountain-biking side, though, there are plenty of options, some even below 300g. Are any of these acceptable for road use?

    Maximum acceptable pressure seems to vary with tire width. ENVE has a sliding scale for their Twenty9 XC rims (hooked, i18, 375g):

    https://enve.zendesk.com/hc/en-us/ar...ountain-Wheels

    Easton has a similar sliding scale:

    https://www.eastoncycling.com/media/...20pressure.pdf

    While they mention tubeless, they don't give a different set of numbers for it. Nor does the chart differentiate between hooked and hookless (or carbon and alloy), though they show a cross-section of a hooked rim.

    https://www.lightbicycle.com/bead-ho...ompatible.html

    LB says 40 PSI max for this hookless without listing a tire size.

    More recently, Hunt has come out with hookless road rims:

    https://www.huntbikewheels.com/blogs...rims-explained

    They're a little cagey about what makes them different from any other hookless rims.

    I see two failure modes for excessive pressure: the rim breaks or the tire blows off. The first seems improbable (the lateral force on the rim from a low-volume tire at high PSI should be similar to a high-volume tire at low PSI). The second, I don't know.

    Has anyone tried a hookless "mountain bike" rim with a tubeless road tire?
    Road rims are larger diameter and therefore heavier. MTB rims are assumed to be used with disc brakes and so can be made lighter. MTB rims take much lower pressure and so can be made lighter. Repeated attempts by a broad range of manufacturers have tried to make aluminum road bike rims lighter than 400 gm and all have resulted in low durability. Current consensus is that it is pretty hard to get below 420 gm or so and have a durable rim.

  3. #3
    RoadBikeReview Member
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    Lots of misinformation. Mtb AL rims have exploded. Lots of very good, light, durable, and wide AL rims. Most are segmented into down hill, cross country, enduro/all mountain and cx.

    I am using non traditional carbon wheels on 2 bikes. 1 is Santa Cruz Stigmata cross bike and the second is Trek Domane. Santa Cruz has a set of Nox carbon wheels and the Domane has a set of Derby carbon i23mm. I have 28 Schwable one on them. Tubeless and freakin awesome!!!

    Tight fight for sure but once one your good!! No tubes for me.

  4. #4
    RoadBikeReview Member
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    Maybe I'm missing something...most mtb are no longer 26 wheels. Mix of 27.5 and 29ers. The last hold has been downhill bikes. Santa Cruz is about to change all that. Rolling out a downhill v10 29er.

    I'm picking up a fat bike this september...egen that will have 27.5 wheelset with 4.5" tires

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