DH tires - knob size for dry & dusty- Mtbr.com
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  1. #1
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    New question here. DH tires - knob size for dry & dusty

    My question is...when the mountain is EXTREMELY dry and dusty (loose over hardpack), will a shorter knob profile grip better than taller knobs? I remember reading about some dudes cutting their treads to make a lower profile.

    Lets assume both have a low "tacky" compound.

    It seems that the taller knobs on my Minion were "washing" out in the soft dry soil.

    So I was thinking of trying something new.

  2. #2
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    I think when you shave off the knobs, you increase the contact of the rubber to the surface, knobs are there to clear dirt, and if you increase the tire's contact patch you get more grip...

    I don't know the impact of shaving your tire's knobs, sorry.

    for tires with low knobs, IMO the Nokian Gazzaloddi aka Gazza North Shore works well.
    Hunter, Simmons, Berrecloth, Watson,Vanderham, Semenuk, Schley, Gulevich, Bourdon, Smith, Moreland, Shandro, Boyko... Bieber.

  3. #3
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    so...

    Quote Originally Posted by suicidebomber
    I think when you shave off the knobs, you increase the contact of the rubber to the surface, knobs are there to clear dirt, and if you increase the tire's contact patch you get more grip...

    I don't know the impact of shaving your tire's knobs, sorry.

    for tires with low knobs, IMO the Nokian Gazzaloddi aka Gazza North Shore works well.

    so you believe that a shorter knob will grip better in extremely dry situations?
    I'm not interested in cutting treads, I just remember reading about it last week.

  4. #4
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    Contact surface will increase grip on slick hardpack. Taller knobs provide penetration into loose dirt. It depends on how deep the loose stuff is over the hardpack.

    The Minions might be washing if you are trying to corner on the "channel" they have between the center and sideknobs (I'm assuming you're using the Minion F) - lean the bike more so the sideknobs are digging straight down.
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  5. #5
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    Durometer/compound?

    Quote Originally Posted by DHidiot
    Contact surface will increase grip on slick hardpack. Taller knobs provide penetration into loose dirt. It depends on how deep the loose stuff is over the hardpack.

    The Minions might be washing if you are trying to corner on the "channel" they have between the center and sideknobs (I'm assuming you're using the Minion F) - lean the bike more so the sideknobs are digging straight down.

    I'm looking at some cheap Hutchinson Bulldog 2.5's which are tubeless.
    I notice they have much shorter knobs (and are avail in 2 different durometers...sticky and a harder compound).

    Do you think a harder compound (durometer) is best for dry conditions?
    I love super tacky's...but the dry conditions destroy my tread after 1 day of riding.

  6. #6
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    I have a good page in decline mag (issue 19 dec, 2005) on page 40 about tire cutting, it has the minion(s) showed with all the cuts for specific things (including loose over hardpack) my camera will be back on wednesday so I can take a picture of it then if you PM me to remind me...
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  7. #7
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    All I know is my intense 909 works really well in really dusty dry conditions, and that has really tall knobs

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    I haven't heard much about Bulldog 2.5s, but the smaller sizes were The 2.5 might be ok on the rear, but if you like having front control, try something proven there.
    Gazza 2.6, Nevegal 2.7, Michelin 2.8, Intense 909, etc.

    When it's dusty (or snowy for that matter), I like Gazza Jrs - spiky tread with huge corner knobs and they don't slide out like a lot of other tires. They also don't have that "gap" like Maxxis and some others, so they are totally predictable on turn in.

  9. #9
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    tubeless

    Quote Originally Posted by fsrxc
    I haven't heard much about Bulldog 2.5s, but the smaller sizes were The 2.5 might be ok on the rear, but if you like having front control, try something proven there.
    Gazza 2.6, Nevegal 2.7, Michelin 2.8, Intense 909, etc.

    When it's dusty (or snowy for that matter), I like Gazza Jrs - spiky tread with huge corner knobs and they don't slide out like a lot of other tires. They also don't have that "gap" like Maxxis and some others, so they are totally predictable on turn in.
    I've tried all variations of the brands you referenced...but now I run UST tubeless tires only.
    I love the tubeless concept, and the ease of fitting them to the deemax.

    I'm thinking of trying the bulldog because it is $20 and UST. PLUS its knobs are WAY smaller than anything I have ever tried.
    If it sucks...oh well $20 gone.

    Intense 909, Gazzy, Nevegal....none are UST (except for maybe XC specific).

  10. #10
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    I run the 909 with stans. Ut works pretty well

  11. #11
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    909 tubeless

    Quote Originally Posted by Rover Nick
    I run the 909 with stans. Ut works pretty well
    which rims are you running with the 909's and Stans?

  12. #12
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    If you want the 909 in tubeless just run the Michi Comp 32 - nearly identical tread pattern except it has one more intermediate knob and is UST I believe.
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  13. #13
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    WTB TimberWolf 2.5
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    Be carefull on those Bulldog's. I purchased a set of 2.3's and the actual tread width was barley 2.0.

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    Quote Originally Posted by dogonfr
    WTB TimberWolf 2.5
    Are good for making a chainstay protector out of.....if that.
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  16. #16
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    Quote Originally Posted by freeriderB
    so you believe that a shorter knob will grip better in extremely dry situations?
    I'm not interested in cutting treads, I just remember reading about it last week.
    I think that by increasing the contact patch of the tire to the surface, you find more grip.

    Though I am not the guy that will cut his knobs for the sake of better loose soil grip.

    I run Gazza Jrs, and the knobs are low.
    Hunter, Simmons, Berrecloth, Watson,Vanderham, Semenuk, Schley, Gulevich, Bourdon, Smith, Moreland, Shandro, Boyko... Bieber.

  17. #17
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    Quote Originally Posted by dogonfr
    WTB TimberWolf 2.5
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  18. #18
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    Quote Originally Posted by DHidiot
    Are good for making a chainstay protector out of.....if that.
    Have you tryed them in the silt
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  19. #19
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    Quote Originally Posted by freeriderB
    which rims are you running with the 909's and Stans?

    Deetracks with maxxis rimstirps. I run a Michelin DH24 2.2 in the back.

    And yes, the DH32 is similar but I run the FRO lites in the 2.5 variety and they are a whole lot lighter than the 32.

  20. #20
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    Quote Originally Posted by DHidiot
    Are good for making a chainstay protector out of.....if that.
    yeah I have to wonder if you've seen the Timberwolf.

    Big tall square knobs with fairly soft rubber - hmm, seems like it could work very well on the dust, not sure about hardpack though.
    Last edited by fsrxc; 06-27-2007 at 12:31 PM.

  21. #21
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    From what I've read Nevagals work good with anything, but w/e.
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  22. #22
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    Quote Originally Posted by fsrxc
    yeah I have to wonder if you've seen the Timberwolf.

    Big tall square knobs with fairly soft rubber - hmm, seems like it could work very well on the dust, not sure about hardpack though.
    Yeah. They suck there too. I like tires that actually hook up and have controlled drift and don't spontaneously explode on me.

    If I were going to run anything WTB in silt/dust, it would be the Weirwolf 2.5. If I had my choice of anything to run in silt, Minion F, Chunder, Comp 32/16.

    The knobs are not all that big, average height, flex badly, and create a horrible profile.
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  23. #23
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    Quote Originally Posted by DHidiot
    Yeah. They suck there too. I like tires that actually hook up and have controlled drift and don't spontaneously explode on me.

    If I were going to run anything WTB in silt/dust, it would be the Weirwolf 2.5. If I had my choice of anything to run in silt, Minion F, Chunder, Comp 32/16.

    The knobs are not all that big, average height, flex badly, and create a horrible profile.
    Ok, I haven't actually *used* a timberwolf, but they look good...

    Yeah, Weirwolf 2.5 is a very good front tire for loose stuff. I've used it on snow too, just currently hooked on Gazzas...

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