Results 1 to 17 of 17
  1. #1
    mtbr member
    Reputation:
    Join Date
    Aug 2012
    Posts
    121

    Force Carbon rear tire rub -- need help/advice

    Evening everyone. Have a bit of an issue I could really use some help/guidance with. Building up a new 2012 GT Force Carbon with new carbon 33mm wide wheelset. Problem is my 26" 2.4 Schwalbe tire is rubbing just barely on the top of the chain stay. Sorry of saying "put on a smaller tire," any other suggestions that I could try to get this tire/wheel to work? Think sanding down the frame to remove the clear and paint would solve it? If I got 2mm of extra clearance I think that would do it. The lower part of the chain stay isn't even close to rubbing, just the top. Thanks in advance!!

    Force Carbon rear tire rub -- need help/advice-2014-01-10-21.55.22.jpgForce Carbon rear tire rub -- need help/advice-2014-01-10-21.55.48.jpg

  2. #2
    mtbr member
    Reputation:
    Join Date
    Jun 2007
    Posts
    156
    run a smaller tire in the back and the bigger one in the front till it wears down some then stick it back in the back.

  3. #3
    mtbr member
    Reputation:
    Join Date
    Feb 2013
    Posts
    43

    Force Carbon rear tire rub -- need help/advice

    Quote Originally Posted by slowpok92 View Post
    run a smaller tire in the back and the bigger one in the front till it wears down some then stick it back in the back.
    Yep! I would not have thought of that, but yep,sounds like that would work. I deff would not scrape, sand, or try to modify a carbon frame just for tire size

  4. #4
    mtbr member
    Reputation:
    Join Date
    Oct 2005
    Posts
    238
    What about a Rock Razor in the back? 2.35 and made for Enduro, but with short tread int he center. It would probably handle just as good . . . probably.

  5. #5
    mtbr member
    Reputation:
    Join Date
    Aug 2012
    Posts
    121
    Quote Originally Posted by slowpok92 View Post
    run a smaller tire in the back and the bigger one in the front till it wears down some then stick it back in the back.
    Quote Originally Posted by jazclrint View Post
    What about a Rock Razor in the back? 2.35 and made for Enduro, but with short tread int he center. It would probably handle just as good . . . probably.
    Quote Originally Posted by manuelS View Post
    Yep! I would not have thought of that, but yep,sounds like that would work. I deff would not scrape, sand, or try to modify a carbon frame just for tire size
    Does a 2.3/2.2 tire even make a difference? I thought the measurement applied to the width, in which case the width isn't the problem it's the height of the tread.
    I'm not so sure I can just swap out a tire. These Schwalbe tires were so freaking tight, I spent a couple hours trying to get it on the rim. Then, obviously without knowing the fitment issue, put on the tire, filled it with Stan's and dealt with valve air leak issues for a couple days. Then got it all ready to go. Needless to say, I may very well have to buy a new rim, hub, and tire combo. I thought for sure there would be other ideas than just put on a different tire.....these Schwalbe's never even came close to rubbing anything on my Titus EG.

  6. #6
    mtbr member
    Reputation:
    Join Date
    Oct 2005
    Posts
    238
    No way should it have taken you a few hours. What kind of rims are you using?

  7. #7
    mtbr member
    Reputation:
    Join Date
    Aug 2012
    Posts
    121
    Quote Originally Posted by jazclrint View Post
    No way should it have taken you a few hours. What kind of rims are you using?
    I'm running 26", 33mm wide Light Bicycle rims (you can find the thread for these wheels on these forums). Schwalbe tires are an absolute nightmare to install, plus I've already got these guys all set up for tubeless and the Stan's in it. Am really just curious if there's another option to get the frame to allow the tire as is. A different type of dropout that gives me just a bit more clearance?

  8. #8
    mtbr member
    Reputation:
    Join Date
    Jun 2012
    Posts
    864
    That is not enough clearance. Even the slightest bend in rim will cause it to rub.

    Does a tire at 40mph have enough centrifugal force to stretch it by a mm or 2?

    It will be nothing but a dirt and mud collector on the frame

    You really should mount a tire that fit

  9. #9
    mtbr member
    Reputation:
    Join Date
    Aug 2012
    Posts
    121
    Quote Originally Posted by Learux View Post
    That is not enough clearance. Even the slightest bend in rim will cause it to rub.

    Does a tire at 40mph have enough centrifugal force to stretch it by a mm or 2?

    It will be nothing but a dirt and mud collector on the frame

    You really should mount a tire that fit
    The stock tire is a 2.25", I wanted to run my 2.4". I was totally unaware that a wider tire is actually TALLER as well in the wheelwell. Never would have expected it; if I did I wouldn't have gone through the tubeless setup and bothered with Stan's goop.

    A different type of dropout that gives me just a bit more clearance?
    Last edited by chrisingrassia; 01-13-2014 at 05:07 AM.

  10. #10
    May the Force be with you
    Reputation: norcalchico's Avatar
    Join Date
    Dec 2006
    Posts
    1,028
    Quote Originally Posted by chrisingrassia View Post
    The stock tire is a 2.25", I wanted to run my 2.4". I was totally unaware that a wider taller is actually TALLER as well in the wheelwell. Never would have expected it; if I did I wouldn't have gone through the tubeless setup and bothering with Stan's goop.

    A different type of dropout that gives me just a bit more clearance?
    The other thing to think about is , your going to get rub on the side to side also when you corner. I would put the big tire on the front

    What such a big tire on the rear?

  11. #11
    mtbr member
    Reputation:
    Join Date
    Aug 2012
    Posts
    121
    Quote Originally Posted by norcalchico View Post
    The other thing to think about is , your going to get rub on the side to side also when you corner. I would put the big tire on the front

    What such a big tire on the rear?
    True, the 2.4 is just too big of a tire with the current dropout setup.

    I run a 2.4 already on the front as well. I don't understand why you want a smaller tire on the rear -- all your power and torque is delivered to that tire. Why would you not want beefiness/traction there?

    Doesn't sound like anyone may know of a different dropout option to run larger tires in the rear. Totally bummed... =(

  12. #12
    mtbr member
    Reputation:
    Join Date
    Nov 2008
    Posts
    408
    Most of your drag comes from the back tire. A smaller in the rear makes it fast, but eith your weight sitting back so far on the bike, it bites better. I run a smallish xc tire in the rear and a big front to grab everything while unweighted

    Sent from my LG-P769 using Tapatalk

  13. #13
    mtbr member
    Reputation:
    Join Date
    Aug 2012
    Posts
    121
    Quote Originally Posted by Kevin_Federline View Post
    Most of your drag comes from the back tire. A smaller in the rear makes it fast, but eith your weight sitting back so far on the bike, it bites better. I run a smallish xc tire in the rear and a big front to grab everything while unweighted

    Sent from my LG-P769 using Tapatalk
    Not sure I understand the physics of that concept. An XC tire vs. AM/DH tire in the rear would provide less grip while pedaling, especially when standing and climb-pedaling. No?

    Regardless, sounds like my 2.4 in the rear is a no-go anyway on the Force Carbon, which is what I'm most disappointed with.

  14. #14
    mtbr member
    Reputation:
    Join Date
    Oct 2005
    Posts
    238
    With a smaller tire you have more weight per square inch. I'm 6'2", 225lbs, and on a good day can put 1000 watts to the cranks. I don't think I need much more than a 2.1" tire with some really good grip. A bigger tire floats over things and actually has less rolling resistance at the same psi. Often times rear tires are narrower because you don't want the tire to float but dig into soft dirt, loose over hard, or mud and find traction for when you put the power down. Also, some folk prefer that the rear tire loses traction first letting them know that the front may be soon to go. If you ride down hill more than up (the kind of riding the Force is aimed at) then a bigger tire in the back kind of makes sense as you can find yourself putting greater forces cornering at high speeds than you could muster out of you legs. But really, a 2.4 in the front and 2.2/2.3 in the back should be more than enough.

  15. #15
    mtbr member
    Reputation:
    Join Date
    Aug 2012
    Posts
    121
    Quote Originally Posted by jazclrint View Post
    With a smaller tire you have more weight per square inch. I'm 6'2", 225lbs, and on a good day can put 1000 watts to the cranks. I don't think I need much more than a 2.1" tire with some really good grip. A bigger tire floats over things and actually has less rolling resistance at the same psi. Often times rear tires are narrower because you don't want the tire to float but dig into soft dirt, loose over hard, or mud and find traction for when you put the power down. Also, some folk prefer that the rear tire loses traction first letting them know that the front may be soon to go. If you ride down hill more than up (the kind of riding the Force is aimed at) then a bigger tire in the back kind of makes sense as you can find yourself putting greater forces cornering at high speeds than you could muster out of you legs. But really, a 2.4 in the front and 2.2/2.3 in the back should be more than enough.
    My question still somewhat remains though: even if I go to a 2.2/2.3 tire in the rear, it still means the tire would rub. I'm not rubbing the left/right sides of the chainstay, it's rubbing the top. Unless a 2.2/2.3 tire would be shorter in actual height.....

  16. #16
    mtbr member
    Reputation:
    Join Date
    Oct 2005
    Posts
    238
    Yes, it's a circle no matter how pump air into it. If it is narrower that also means it will be shorter.

  17. #17
    mtbr member
    Reputation:
    Join Date
    Aug 2012
    Posts
    121
    Quote Originally Posted by jazclrint View Post
    Yes, it's a circle no matter how pump air into it. If it is narrower that also means it will be shorter.
    Stuck a 2.2 on the rear, had the shop do my tire change. It's still darn close, but it fits. The Fat Alberts must just be some serious beef then.

Similar Threads

  1. GF CX with sram force rear the carbon cage cracked
    By dbcparker in forum Cyclocross
    Replies: 3
    Last Post: 05-13-2012, 08:08 AM
  2. Need some advice for a rear tire please ?
    By aedubber in forum Wheels and Tires
    Replies: 1
    Last Post: 10-03-2011, 05:13 PM
  3. Replies: 2
    Last Post: 04-24-2011, 07:30 AM
  4. Force Carbon Rear Swingarm?
    By ozpablo in forum GT
    Replies: 3
    Last Post: 03-22-2011, 03:25 PM
  5. Rear Tire advice
    By wvucrna in forum 29er Bikes
    Replies: 9
    Last Post: 01-28-2011, 01:17 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •