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  1. #1
    aka Phil Jungels Wanderer's Avatar
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    Fat Tires on a Sirrus ?

    Anyone ever fit 35 or 40s on a Sirrus ? I wonder how big you can go, and still fit fenders?

    "Retirement is the best job I ever had!" Me, 2009


    Specialized Crosstrail Sport - '08
    Nishiki Sport - misappropriated from my youngest son (circa 1984)
    Marin Stinson - misappropriated by my youngest grandson - '01
    "The Beast" - 1990 Schwinn Airdyne (in the basement for winter torture)

  2. #2
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    You may want to re-phrase the question, Fat Tires are for Fat Bikes, as in 26 x 3.7 to 4.0.

    Have a look at this thread on MTBR, as it may answer your question Fat tires on Specialized Sirrus? Fat tires / bikes weren't as common when this was posted a few years back.

  3. #3
    aka Phil Jungels Wanderer's Avatar
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    40 would be really FAT on a Sirrus. LOL. I know they used to come with 32s, and always figured a 35 would work ---- but sure would like to have a 40 on the back.

    I might have to take a trip to find out how much room is in there - don't know if the frame I still the same.

    I hate N+1..................

    "Retirement is the best job I ever had!" Me, 2009


    Specialized Crosstrail Sport - '08
    Nishiki Sport - misappropriated from my youngest son (circa 1984)
    Marin Stinson - misappropriated by my youngest grandson - '01
    "The Beast" - 1990 Schwinn Airdyne (in the basement for winter torture)

  4. #4
    PatronSaintOfDiscBrakes dynaryder's Avatar
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    My old '05 Sirrus had PB Hybrid fenders,which would fit 38's under them. Don't know how much the design has changed since then.

    Best way is to try to see what size fenders will fit. Try going to a bike shop and see if they'll let you slide a set between the forks and rear triangle to see what fits.

    C'dale BBU('05 and '09)/Super Six/Hooligan8and 3,Kona Dew Deluxe,Novara Buzz/Safari,Surly Big Dummy,Marin Pt Reyes,Giant Defy 1,Schwinn DBX SuperSport/Qualifier,Dahon Speed Pro TT,Brompton S6L

  5. #5
    aka Phil Jungels Wanderer's Avatar
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    I think PB Cascadias are 45 wide. If they would fit, a 40 will go underneath.... I think I'm gonna visit the Specialized dealer with a ruler...........

    "Retirement is the best job I ever had!" Me, 2009


    Specialized Crosstrail Sport - '08
    Nishiki Sport - misappropriated from my youngest son (circa 1984)
    Marin Stinson - misappropriated by my youngest grandson - '01
    "The Beast" - 1990 Schwinn Airdyne (in the basement for winter torture)

  6. #6
    PatronSaintOfDiscBrakes dynaryder's Avatar
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    Just remember,wider tires are also taller. My BBU's/F600 have plenty of width,but anything over a 700x32 would rub the underside of the fork.

    C'dale BBU('05 and '09)/Super Six/Hooligan8and 3,Kona Dew Deluxe,Novara Buzz/Safari,Surly Big Dummy,Marin Pt Reyes,Giant Defy 1,Schwinn DBX SuperSport/Qualifier,Dahon Speed Pro TT,Brompton S6L

  7. #7
    Senior Member
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    I had a feeling of deja vu, so I searched the forum - you asked this same question last year
    Wide tires on a Sirrus?
    http://treadrightly.blogspot.com/

  8. #8
    aka Phil Jungels Wanderer's Avatar
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    I've got some physical issues that require a softer ride. Front suspension and wider tires take care of it for me.

    But, coming from a road bike, quite few years ago, I'd still like to b able to get closer to it, when I can.

    And ---- asking the same question with newer models, just shows I am still interested in it.

    Plus, I really like the looks of the Sirrus line, and lust after disc brakes.

    I love my Crosstrail, and would keep it for all of the reasons I love it; but still see nothing wrong with N+1.

    Fatter tires, fenders, and rack would still be required, as it would still be needed for whatever.

    "Retirement is the best job I ever had!" Me, 2009


    Specialized Crosstrail Sport - '08
    Nishiki Sport - misappropriated from my youngest son (circa 1984)
    Marin Stinson - misappropriated by my youngest grandson - '01
    "The Beast" - 1990 Schwinn Airdyne (in the basement for winter torture)

  9. #9
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    The obvious solution is to ditch fenders, if installed. Its basically trade off between riding comfort and protection from the elements. If fenders are a MUST have, be prepared to live with smaller tires that can fit under them.

  10. #10
    Senior Member ColonelSanders's Avatar
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    Quote Originally Posted by Wanderer View Post

    I love my Crosstrail, and would keep it for all of the reasons I love it; but still see nothing wrong with N+1.
    Please excuse my ignorance, but what do you mean by the term "N+1"?
    You can have my Disc Brakes, when you pry them from my cold, dead hands.

  11. #11
    aka Phil Jungels Wanderer's Avatar
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    The bike you have, = N, plus the bike you need = +1.................

    "Retirement is the best job I ever had!" Me, 2009


    Specialized Crosstrail Sport - '08
    Nishiki Sport - misappropriated from my youngest son (circa 1984)
    Marin Stinson - misappropriated by my youngest grandson - '01
    "The Beast" - 1990 Schwinn Airdyne (in the basement for winter torture)

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