Results 1 to 10 of 10
  1. #1
    mtbr member
    Reputation:
    Join Date
    Dec 2017
    Posts
    7

    Seriously Dented 29er Rim

    I was out for a ride on my new (1 month old) Giant Fathom 29er HT, riding some blue and black trails. I was running 27 psi in the front and 33 in the rear on tubeless tires.

    About halfway into my ride, I can hear and feel that the tube is leaking air during every rotation, and the side of the rim is completely bashed in such that the bead wont sit/seal in the rim. I was able to bend the rim back out when I got home, but it doesn't look great. It does seal but I'm not sure it will hold up to any real abuse again.

    This is my only bike (for now), and I have a few trips planned in the next few months. So, could anyone recommend to me a sturdier rim that would be less prone to getting dented? Or was my tire pressure to low? I've never had these problems on my older FS before I sold it.

  2. #2
    mtbr member
    Reputation:
    Join Date
    Aug 2011
    Posts
    4,333
    Uhh, stop riding when leaking air? Rider weight and rim width? Take some type of pliers or channel locks with padding and gently bend the rim back.

  3. #3
    mtbr member
    Reputation:
    Join Date
    Dec 2017
    Posts
    7
    Leeboh, I did stop riding within 100 feet once I noticed the problem. I weigh 170 lbs as well. I did bend the rim back, but even then, I can't get it perfect. If this is normal damage, I'd be curious to know. If not, any recommendations for stronger rims?

  4. #4
    because GIANT
    Reputation: 127.0.0.1's Avatar
    Join Date
    Nov 2013
    Posts
    2,827
    if you bash an alum rim, it can bend sure

    sometimes it just gets scrapes

    sometimes nothing happens

    fact is, it was not the rim that caused a problem, it was you bashing something
    beyond the air pressure ability to keep rim from getting corked


    a new rim won't help smashing things. those bone stock giant rims are probably tougher than most since they are a bit heavier and sturdier. higher cost rims are gonna be lighter and tougher overall in general when built, but tougher in that they tend to stay true...not tougher in that the rim can eat a rock (this varies though, there are super tough high end rims out there, but really no rim is designed to eat a rock, ever)

    they will take rocks hits the same as that giant rim. not so well if the tire is low or if the rock exceeds tire pressure

    for the rim itself, bend it back as best you can and ride it
    "Put your seatbelt back on or get out and sit in the middle of that circle of death." - Johnny Scoot

  5. #5
    mtbr member
    Reputation:
    Join Date
    Dec 2017
    Posts
    7
    Quote Originally Posted by 127.0.0.1 View Post

    fact is, it was not the rim that caused a problem, it was you bashing something
    beyond the air pressure ability to keep rim from getting corked
    That's good to know. I've never had tubeless before, so maybe I'll have to experiment with higher pressure, especially on the rear tire. It's a bummer, since I felt that 33 psi was giving me good traction and a smoother ride. Oh well!

  6. #6
    mtbr member
    Reputation: Lone Rager's Avatar
    Join Date
    Dec 2013
    Posts
    3,058
    Quote Originally Posted by admc7777 View Post
    I was out for a ride on my new (1 month old) Giant Fathom 29er HT...the side of the rim is completely bashed in...I've never had these problems on my older FS before I sold it.
    You probably know you need to ride a HT differently than a FS. Suspension reduces the bump forces on the bike and rider, and oppositely and equally, reduces the bump forces on the wheel.
    Do the math.

  7. #7
    mtbr member
    Reputation: Fix the Spade's Avatar
    Join Date
    Aug 2008
    Posts
    2,733
    Quote Originally Posted by admc7777 View Post
    That's good to know. I've never had tubeless before, so maybe I'll have to experiment with higher pressure, especially on the rear tire. It's a bummer, since I felt that 33 psi was giving me good traction and a smoother ride. Oh well!
    Bad luck can strike anyone at any time. At 30+ psi killing the rim in one hit is just pure bad luck.

    Replace the rim with another one the same, or if you're up for spending the money any Mavic/Alex/DT Swiss rim that fits to your intended width and budget, but that will probably require new spokes as well.

  8. #8
    mtbr member
    Reputation: Rngspnr's Avatar
    Join Date
    Feb 2016
    Posts
    517
    33 in rear is high for me. I run 28 in rear at 235lbs. I have never hit the rim hard enough to do any damage. That sucks. If they where factory rims they're probably a bit soft. Like another poster said you may want to consider stronger hoops.
    2016 Evil Following V1
    2016 Dartmoor Primal+

  9. #9
    mtbr member
    Reputation:
    Join Date
    Oct 2017
    Posts
    16
    Giant's website says they're xc wheels. You should probably get something trail rated if you're going to do harder trails. Something like Stans Arch mk3 or DT Swiss xm481 would be a good place to start.

  10. #10
    mtbr member
    Reputation: Schulze's Avatar
    Join Date
    Feb 2007
    Posts
    629
    All this talk of air pressure is pointless unless you tell us the size of your tire.

    At 170lbs geared up, my rear 2.4" tire is at 22psi, hardtail. I've never had a rim strike on that tire, and all I ride is rocks!

Similar Threads

  1. I dented my rim...
    By Rycan86 in forum 26+/27.5+/29+ Plus Bikes
    Replies: 9
    Last Post: 11-27-2017, 08:22 PM
  2. Bending back a dented rim
    By dirtrider76 in forum Wheels and Tires
    Replies: 9
    Last Post: 10-28-2015, 12:06 PM
  3. Replies: 27
    Last Post: 01-16-2015, 06:32 PM
  4. Dented Rim, how bad is too bad?
    By SandSpur in forum Wheels and Tires
    Replies: 13
    Last Post: 11-23-2013, 06:33 PM
  5. Seriously... 26 or 29er
    By Damitletsride! in forum Endurance XC Racing
    Replies: 48
    Last Post: 03-22-2012, 07:33 AM

Members who have read this thread: 98

Posting Permissions

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