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  1. #1
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    Stan's Grail and 42c tires, possible?

    Anyone running 42c tires on Grails?

    Stan's website says up to 40c, but looks like others are running wider with no issues.

    I wanted to use WTB Resolutes, which are 42c.

    Thanks!

  2. #2
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    https://weightweenies.starbike.com/f...36644&start=30

    Down toward the bottom of that page, there's a 42mm Gravel King comment.

  3. #3
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    Quote Originally Posted by tangerineowl View Post
    https://weightweenies.starbike.com/f...36644&start=30

    Down toward the bottom of that page, there's a 42mm Gravel King comment.
    Nice!

    Thanks for the link. Look like I'm good then.

  4. #4
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    I don't have any experience at all with the gravel king, resolute, or grails.

    There's a couple issues. The most obvious is that tires dramatically wider than their rims have a lightbulb shape and they handle funny. More significantly, some tire beads err on the tight side and some on the loose side. The difference is less than a mm, but at high pressures (and especially with lightweight noodly rims like grails) that can lead to a sudden blow off under the right circumstances.

    As a bigger guy whose experienced multiple blow-offs on supposedly compatible mtb tires/rims, the thought of a blow-off on a road/gravel bike is terrifying. I wouldn't assume that since a oversize tire from a different manufacturer was ok that anything similar was alright. 2mm of advertised width is meaningless, it's not even the etrto measurement.


    I don't mean to be some nannying ninny, just be careful.
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  5. #5
    jrm
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    Im rolling 43/48c on crests..

  6. #6
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    Quote Originally Posted by jrm View Post
    Im rolling 43/48c on crests..
    Crests are a mtb rim. Road tubeless rims are designed around higher pressures and aren't so worried about a wide tire pulling the bead hooks outward.
    "Things that are complex are not useful, Things that are useful are simple."
    Mikhail Kalashnikov

  7. #7
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    Iím pretty sure I had 45c riddlers on my grails when I had them without any issues whatsoever.
    I now have a set of the new crests. Less aero, but way lighter.

  8. #8
    jrm
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    Quote Originally Posted by scottzg View Post
    Crests are a mtb rim. Road tubeless rims are designed around higher pressures and aren't so worried about a wide tire pulling the bead hooks outward.
    yup and with smaller tires i use tubes...YMMV

  9. #9
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    Quote Originally Posted by scottzg View Post
    Crests are a mtb rim. Road tubeless rims are designed around higher pressures and aren't so worried about a wide tire pulling the bead hooks outward.
    I donít understand this. Crests are wider, and both are rated for the same tubeless psi.

  10. #10
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    Quote Originally Posted by Chippertheripper View Post
    both are rated for the same tubeless psi.
    They are not rated for the same size tubeless psi at anywhere close to the same size tire. Crest is rated for up to 40psi and a 64mm tire, Grail is rated for up to 116psi and a 32mm tire. Completely different.

    Ignore the manufacturer's recommendations at your own risk.
    "Things that are complex are not useful, Things that are useful are simple."
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  11. #11
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    116psi is for a 23mm tire.
    For 32mm+, youíre looking at 45psi.
    Which, from my seat is close enough to being the same as a crest, since the op was asking about a 42ís.

  12. #12
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    Quote Originally Posted by Chippertheripper View Post
    116psi is for a 23mm tire.
    For 32mm+, youíre looking at 45psi.
    Which, from my seat is close enough to being the same as a crest, since the op was asking about a 42ís.
    Not sure why you're struggling with this. Tire pressure loads a rim in a different manner than tire width. Make assumptions at your own risk.
    "Things that are complex are not useful, Things that are useful are simple."
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  13. #13
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    I used to run 26" Roval Control SL rims with a 16.5mm inner width with 2.25" tyres no problem.

    They were designed for 1.9-2.25".
    Now my road rims are wider and I worry about 32mm tyres being too big...

  14. #14
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    Currently running Resolutes on Grail rims, no problem at all.

    Sent from my Pixel using Tapatalk

  15. #15
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    Quote Originally Posted by SLCpowderhound View Post
    Currently running Resolutes on Grail rims, no problem at all.

    Sent from my Pixel using Tapatalk
    Thanks!

    Stan's also got back to my email and said it was OK.

  16. #16
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    Quote Originally Posted by steinercat View Post

    Stan's also got back to my email and said it was OK.
    Game on!
    "Things that are complex are not useful, Things that are useful are simple."
    Mikhail Kalashnikov

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