Anyone else have a problem with these cranks loosening up during a ride? My come loose about once every hour of riding. I am wonderign about using loctite on them. Any suggestions?
Thanks
Thanks
Truvativ GXP Singlespeed Cranks coming loose.
Alpenglow
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160 Posts
I've had one of these for almost a year now. It came loose once when it was new, but otherwise no problems. (Blue) Loctite would probably help, but you shouldn't need it. I'd check with your shop or call the tech line if I were you.
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2,296 Posts
Ugh. Mine did this constantly. I could never fix it. Eventually I cranked down so hard on the hex key that it blew out the bearing and jammed it on the axle. The crank had to be removed from the BB with a hammer. The bearing sleeve couldn't be removed from the axle. It's now sitting in a grocery bag waiting to have the chainrings removed for spares.
I tried everything: torque, cleaning, refitting, blue loctite, etc. Over and over and over.
If you see a guy on the trail whaling on his crankset, it's a Truvativ GXP.
The problem is in the design of the crank.
Fortunately, mine was toast, so I bought an XT crankset which seems to have been designed much better.
I tried everything: torque, cleaning, refitting, blue loctite, etc. Over and over and over.
If you see a guy on the trail whaling on his crankset, it's a Truvativ GXP.
The problem is in the design of the crank.
Fortunately, mine was toast, so I bought an XT crankset which seems to have been designed much better.
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335 Posts
With mine I did the install then remove then reinstall. It never loosened after that with a whole year of riding. I removed it for cleaning a couple times but still never had issues after the reinstall.
Using synthetic grease heavily on the spindle is recommended by Truvative FWIW.
Using synthetic grease heavily on the spindle is recommended by Truvative FWIW.
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6,567 Posts
My non-drive side crank actually came off the axle (still attached to my foot) on it's second ride out of the box (the first ride was a race however). It's been fine since then but checking that bolt is now part of my regular pre-race checklist.
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2,700 Posts
Similar here: My Stylo GXP SS left crankarm worked loose on its second real ride. I tightened it up, then checked/snugged it before my next ride, and it hasn't loosened since. That's about 15 hours of riding time later. (6 or 7 rides) I'm 200lbs and torquey.
Morgan
Morgan
It is not a bad design. It just needs to be installed correctly. If you over tighten it, it is not a design flaw. It says in the directions that you have to install and remove at least once. Sometimes more. I have two sets of these, run singlespeed, and have never had a problem. I have seen XT cranks do this more often.
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2,296 Posts
I installed it exactly according to the instructions.
http://www.sram.com/_media/techdocs/2005_gxp-05-r5-e.pdf
The instructions do NOT say that you have to install and remove at least once. They say that you may have to, to eliminate all play. I had no play.
I ultimately overtightened it because when it was tightened to the correct torque it came loose LITERALLY every 10 minutes. When you are forced to continually retighten on the trail you tend to lose patience. This was after one set of bearings had already self-destructed. I had already disassembled, cleaned, re-greased, re-assembled and re-torqued. I'm glad yours work well. Mine didn't.
http://www.sram.com/_media/techdocs/2005_gxp-05-r5-e.pdf
The instructions do NOT say that you have to install and remove at least once. They say that you may have to, to eliminate all play. I had no play.
I ultimately overtightened it because when it was tightened to the correct torque it came loose LITERALLY every 10 minutes. When you are forced to continually retighten on the trail you tend to lose patience. This was after one set of bearings had already self-destructed. I had already disassembled, cleaned, re-greased, re-assembled and re-torqued. I'm glad yours work well. Mine didn't.
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30 Posts
Never had a problem with this c-set. Mechanics rule is retighten (re-install, rare) after FIRST ride (no exceptions) with a torque wrench. A reputable shop will consider this part of the installation and insist on your return.
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