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#1
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Exceeding torque specs on seatpost clamp
Hi - new seatpost clamp (Ritchey WCS) slips when both bolts torqued to
spec (16 N-m) and even a little beyond. This is on a 'cross bike and the clamp slides back tilting the saddle up with the normal jostling of an hour training or a 45 minute race. Aside from the obvious (crank the hell out of the bolts and hope they don't snap altogether) is there anything I can apply to the undersurface of the clamp to help this ? It's an aluminum post; I specifically avoided carbon to keep low-tech and avoid problems like this. Thanks........Lou D'Amelio |
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#2
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Exceeding torque specs on seatpost clamp
On Sep 30, 5:14 am, Lou D'Amelio wrote:
Hi - new seatpost clamp (Ritchey WCS) slips when both bolts torqued to spec (16 N-m) and even a little beyond. This is on a 'cross bike and the clamp slides back tilting the saddle up with the normal jostling of an hour training or a 45 minute race. Aside from the obvious (crank the hell out of the bolts and hope they don't snap altogether) is there anything I can apply to the undersurface of the clamp to help this ? It's an aluminum post; I specifically avoided carbon to keep low-tech and avoid problems like this. Thanks........Lou D'Amelio Smooth surfaces in the clamp are not the greatest thing for 'cross..with the dismount, remount gig going on. You can try to roughen up the surfaces or get a SP that has 'notches', or one with fore-aft mounting bolts like Thompson. |
#3
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Exceeding torque specs on seatpost clamp
On Sep 30, 6:14 am, Lou D'Amelio wrote:
Hi - new seatpost clamp (Ritchey WCS) slips when both bolts torqued to spec (16 N-m) and even a little beyond. This is on a 'cross bike and the clamp slides back tilting the saddle up with the normal jostling of an hour training or a 45 minute race. Aside from the obvious (crank the hell out of the bolts and hope they don't snap altogether) is there anything I can apply to the undersurface of the clamp to help this ? It's an aluminum post; I specifically avoided carbon to keep low-tech and avoid problems like this. Thanks........Lou D'Amelio I've had good luck with automotive valve lapping compound on slipping components. Probably wouldn't be a good idea on carbon, but it should be OK on aluminum. I've used it on posts that wanted to keep slipping down and it worked fine. You can get it at auto parts stores. If you've ever got a buggered up philips head screw, try putting some on the tip of the screwdriver before you try to turn it out. Smokey |
#4
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Exceeding torque specs on seatpost clamp
On Sep 30, 6:14 am, Lou D'Amelio wrote:
Hi - new seatpost clamp (Ritchey WCS) slips when both bolts torqued to spec (16 N-m) and even a little beyond. This is on a 'cross bike and the clamp slides back tilting the saddle up with the normal jostling of an hour training or a 45 minute race. Aside from the obvious (crank the hell out of the bolts and hope they don't snap altogether) is there anything I can apply to the undersurface of the clamp to help this ? It's an aluminum post; I specifically avoided carbon to keep low-tech and avoid problems like this. Thanks........Lou D'Amelio I've stopped seat posts from slipping (in the frame) by cleaning the mating surfaces with acetone. Haven't tried it on a Ritchey seat post head though. The usual advice still applies about greasing the bolt shoulder, both sides of any washers, and the threads, etc. The Bontrager Race Lite seat post I use for 'cross has never slipped on me. http://www.bontrager.com/Road/Compon...osts/22086.php |
#5
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Exceeding torque specs on seatpost clamp
On 2007-09-30, Lou D'Amelio wrote:
Hi - new seatpost clamp (Ritchey WCS) slips when both bolts torqued to spec (16 N-m) and even a little beyond. This is on a 'cross bike and the clamp slides back tilting the saddle up with the normal jostling of an hour training or a 45 minute race. Aside from the obvious (crank the hell out of the bolts and hope they don't snap altogether) is there anything I can apply to the undersurface of the clamp to help this ? It's an aluminum post; I specifically avoided carbon to keep low-tech and avoid problems like this. Thanks........Lou D'Amelio I'm guessing you when the bolt which attachs the saddle to the seatpost? Replace the bolts with high tensile (12.9 grade) M8 bolts and torque it up, it you're worried about the hut stripping replace it too, or if it's got a special shape drill it out and put in a good quality nuts. Cheers Joel -- Human Powered Cycles | High quality servicing and repairs | Affordable second hand bikes (03) 9029 6504 | Bicycle reuse centre www.humanpowered.com.au | Mechanical and on-road training and instruction |
#6
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Exceeding torque specs on seatpost clamp
Lou D'Amelio wrote:
Hi - new seatpost clamp (Ritchey WCS) slips when both bolts torqued to spec (16 N-m) and even a little beyond. This is on a 'cross bike and the clamp slides back tilting the saddle up with the normal jostling of an hour training or a 45 minute race. Aside from the obvious (crank the hell out of the bolts and hope they don't snap altogether) is there anything I can apply to the undersurface of the clamp to help this ? It's an aluminum post; I specifically avoided carbon to keep low-tech and avoid problems like this. Thanks........Lou D'Amelio and paradoxically, use of an ungreased carbon post would prevent slippage... btw, it's almost certainly ok to increase torque on an aluminum post. the spec you have is probably for a carbon post. |
#7
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Exceeding torque specs on seatpost clamp
Lou D'Amelio wrote:
Hi - new seatpost clamp (Ritchey WCS) slips when both bolts torqued to spec (16 N-m) and even a little beyond. This is on a 'cross bike and the clamp slides back tilting the saddle up with the normal jostling of an hour training or a 45 minute race. Aside from the obvious (crank the hell out of the bolts and hope they don't snap altogether) is there anything I can apply to the undersurface of the clamp to help this ? It's an aluminum post; I specifically avoided carbon to keep low-tech and avoid problems like this. Thanks........Lou D'Amelio There's the Ritchey "liquid torque" stuff: http://www.excelsports.com/new.asp?p...orCode=RITCHEY I've no idea if it works. I had a slippy alum-alum stem/bar joint that I was gonna try it on, but lock-tite seems to be doing the trick so far. Dunno if I'm gonna regret that later. Mark J. |
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