ProCaliber Tire Fitment- Mtbr.com
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  1. #1
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    ProCaliber Tire Fitment

    I have an XL 9.6 on the way. It will be my first boost bike so I'm wondering what's the largest tires y'all are running?
    In serving the wicked, expect no reward, and be thankful if you escape injury for your pains.

  2. #2
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    I have one with Forekaster 2.35s.

  3. #3
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    Quote Originally Posted by Stalkerfiveo View Post
    I have an XL 9.6 on the way. It will be my first boost bike so I'm wondering what's the largest tires y'all are running?
    I have a Ardent 2.4 on a 25mm ID rim in the front and a Ikon 2.35 on a 25mm ID rim in the back
    Fork is a Fox 32 SC.
    Now a 3" will not fit front of back.. I tried lol

    eb1888 will come on and tell ya a 2.20 is the largest. It's not.

    I can fit a 2.4 in the back but I see no need due to what the bike is made for
    Too Many .

  4. #4
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    That's what Trek says, not me. A 6mm clearance minimum standard on each side may be why they say that. Plus I need a 30mm inner rim minimum cause that's all I have now. Maybe you can put helicopter tape on to protect the carbon stays in case your wheel isn't perfectly true.

  5. #5
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    Quote Originally Posted by eb1888 View Post
    That's what Trek says, not me. A 6mm clearance minimum standard on each side may be why they say that. Plus I need a 30mm inner rim minimum cause that's all I have now. Maybe you can put helicopter tape on to protect the carbon stays in case your wheel isn't perfectly true.
    Not EVERYONE needs a 30MM ID rim for a XC bike dude,

    Gotta start thinking outside the box. what works for you may not work for others

    my 25mm ID rim works just fine for the usage of my Procal.

    I have no tire rub on my stays. out of all my bikes I have never had tire rub on my stays. I have had rocks try to get stuck between tire and stays but then again I do live in AZ which is mostly rock.

    Trek says what they say to cover their ass,.
    They are behind on the tire size fitment age of what people want to run

    Fuel is a 27.5x2.8 MAX, 29x2.5 MAX per Trek.
    I have not tried to fit a 3" rear on my buddies fuel yet. lol It fits the front though
    Too Many .

  6. #6
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    It's worth pointing out that the SL version is "approved" from Trek for 2.2 wide tires, the non-SL carbon and new Aluminum frames are approved for 2.4" tires.
    From the 2018 Procaliber FAQ:
    What is the max tire size?
    Procaliber SL: 29x2.20 (15.5: 27.5x2.20)
    Procaliber (carbon): 29x2.40 (15.5: 27.5x2.40)
    Procaliber (alloy): 29x2.40 (15.5: 27.5x2.40)
    Last edited by kdiddy; 07-15-2017 at 11:01 AM. Reason: added info

  7. #7
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    Quote Originally Posted by brent701 View Post
    Trek says what they say to cover their ass.
    To be fair, they say this to abide by the CPSC standards (6 mm clearance at all points), which any company their size would be smart to do.

    Quote Originally Posted by kdiddy View Post
    From the 2018 Procaliber FAQ:
    What is the max tire size?
    Procaliber SL: 29x2.20 (15.5: 27.5x2.20)
    Procaliber (carbon): 29x2.40 (15.5: 27.5x2.40)
    Procaliber (alloy): 29x2.40 (15.5: 27.5x2.40)
    That is puzzling. I thought the SL and non-SL carbon Procalibers were identical frames, except for the fanciness of the carbon.

    If true, why would the two frames have different max rear tire sizes?
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  8. #8
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    I'd be happy with 2.3-2.4

    It will come with XR1 2.2 front and 2.0 rear. Assuming I don't kill myself on those on the first ride I'll eventually upgrade those to something that still rolls nicely but has better side bite.
    In serving the wicked, expect no reward, and be thankful if you escape injury for your pains.

  9. #9
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    Quote Originally Posted by Stalkerfiveo View Post
    I'd be happy with 2.3-2.4.
    Same. If there is reasonable clearance for a 2.4" XR3, I'll be perfectly happy.

    On a related topic, anybody have any insight as to when the higher Procaliber models (9.8 and 9.9) might hit the U.S. website? I'm only seeing the aluminum ones at this point.
    Whining is not a strategy.

  10. #10
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    Quote Originally Posted by kosmo View Post
    To be fair, they say this to abide by the CPSC standards (6 mm clearance at all points), which any company their size would be smart to do.



    That is puzzling. I thought the SL and non-SL carbon Procalibers were identical frames, except for the fanciness of the carbon.

    If true, why would the two frames have different max rear tire sizes?

    I understand the CPSC thing with them. A 2.35 Ikon fits and fits well.


    and, yes it is kind of odd the Sl vs non-SL frame for tire size.
    Too Many .

  11. #11
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    Quote Originally Posted by kosmo View Post
    Same. If there is reasonable clearance for a 2.4" XR3, I'll be perfectly happy.

    On a related topic, anybody have any insight as to when the higher Procaliber models (9.8 and 9.9) might hit the U.S. website? I'm only seeing the aluminum ones at this point.
    I know of only 1 person that runs the XR1's and likes them. He happens to own the Trek shop I ride for.
    I can't run them. I removed them the day I got my Procal.
    Too Many .

  12. #12
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    Quote Originally Posted by kosmo View Post
    To be fair, they say this to abide by the CPSC standards (6 mm clearance at all points), which any company their size would be smart to do.



    That is puzzling. I thought the SL and non-SL carbon Procalibers were identical frames, except for the fanciness of the carbon.

    If true, why would the two frames have different max rear tire sizes?
    Given the SL has the Control Freak routings always assumed there was a different process there. Now why there is a width difference is beyond me.

  13. #13
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    The larger tire allowance for the lower Procal bikes is good news.
    It makes the bikes more versatile.
    It would be worthwhile to get a picture and/or measurement of the non SL chainstay inner widths of the carbon and aluminum bikes. 75, 80, 85mm or whatever.
    Setting those bikes up for more trail use-- that is important info. This isn't about straight XC use.
    Everyone sets their bike up for what they need.
    Tire and rim combos on a hardtail affect rear compliance for guys with rockier terrain.
    Wider rims with higher volume tires at lower pressures equals more comfort/compliance They affect rear traction and rolling speed.
    It's a balancing of tradeoffs.
    The tuning options let the bike be set up however the terrain demands.
    I've avoided the SL frame because of the terrain I've got. Rocky/rooty. But medium ups and downs without high speeds that need fs.
    I'm going for more out of a hardtail while keeping weight low.
    No way to get enough rear vertical compliance out of the SL when the frame has got zero to start. The prior Superfly 9.6-9.8 frame has 11mm. but only 75mm of chainstay width.

  14. #14
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    IDK if it's been mentioned, but boost is rear hub spec and not directly related to max tire size you can fit. Some boost bikes don't have a lot of tire clearance.
    What, me worry?

  15. #15
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    Quote Originally Posted by Lone Rager View Post
    IDK if it's been mentioned, but boost is rear hub spec and not directly related to max tire size you can fit. Some boost bikes don't have a lot of tire clearance.

    I agree with that. It wasn't really meant to be able to run larger tires.
    Too Many .

  16. #16
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    Quote Originally Posted by kosmo View Post
    Same. If there is reasonable clearance for a 2.4" XR3, I'll be perfectly happy.
    I have a lightly used set of Ardent 2.4's hanging on the wall. I am hoping they squeeze in because the XR1's that come on it look like death traps.
    In serving the wicked, expect no reward, and be thankful if you escape injury for your pains.

  17. #17
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    Quote Originally Posted by Stalkerfiveo View Post
    the XR1's that come on it look like death traps.
    Not death traps but there's definitely room for improvement...

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