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Originally Posted by larsalan
(Post 8234434)
I hardly think that my cranks are loosening. A third turn is quite a small amount and I believe I have over torqued the bolts. How the hell would I measure torque on a #8 hex?
I am really bearing down to tighten them that bit as they are newly installed and I am fiddling w/ them. It may be too late, if the cranks are ridden loose just once, they get buggered and will end up wobbling no matter how tight you screw down the bolts. This wobbling continually backs out the bolt and you have to repeatedly re-tighten them. You may need a new crank soon... |
I discovered this little gem of a BB from Suntour about 3 weeks ago. A matching crank set got sent to me from overseas so I set out to install it on my old XC mtb to test. Much to my annoyance, I discovered that my "early" BB spline tool which has a small bore, was being prevented from engaging by these @#&@! raised sleeves (green arrows). I had to buy a modern spline tool with a large inner bore that can go over those sleeves just for this one install. :mad:
My annoyance soon turned to delight however when I realized that these sleeves acted as "crank stops." :eek: :) I greased the square tapers and the crank-bolt threads & flanges, and simply torqued away until the aluminum crankarms stopped and seated against these sleeves. At that point I gave both sides a decent final tightening and that was it. Usually a square-taper BB needs a few re-checks (being careful not to over-tighten) before it settles down. This one doesn't... it's done once and it stays that way for good! The cartridge looks like the modern style construction seen on modern BB units with power-spline drives, but this one just has a square taper. I marveled at the fact that this little overdue innovation was about 25 years too late! http://i156.photobucket.com/albums/t...uare-Taper.jpg |
Perhaps you are over torquing the bolt? That's something else you want to avoid. Also, you would get a #8 hex fitting for a socket wrench, and put that on a torque wrench instead. Alternatively, torque something else to that torque and compare feel.
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Originally Posted by jccaclimber
(Post 8234923)
Perhaps you are over torquing the bolt? That's something else you want to avoid. Also, you would get a #8 hex fitting for a socket wrench, and put that on a torque wrench instead. Alternatively, torque something else to that torque and compare feel.
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Originally Posted by LarDasse74
(Post 8235537)
Not a #8, but an 8mm is the correct size for most bb bolts.
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