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Old 01-14-22, 12:59 PM
  #51  
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Originally Posted by Andy_K
So, I'm curious, from a structural engineering perspective, does the fact that the force typically comes in at an angle modify the 1/3 2/3 rule? Granted there are cases where the impact may be perpendicular, and I guess structural engineering is all about those worst case scenarios.....
IIRC that rule applies to a force perpendicular to the lever and not an impact or distributed force. its been over 40 years since that class and I am too lazy to pull the text book out!
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Old 01-14-22, 01:33 PM
  #52  
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There is, admittedly, some variance in IM seatpost diameters. All of mine have been 27.0, across 85-86-87-88, but know that others have used a 27.2…although don’t know if those were from the factory or aftermarket fits.

At any rate, better to buy a new and longer post than have the insertion line above the lug. It’s there for a reason and put there by smarter people than us. Well, me, anyway.
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Old 01-14-22, 02:10 PM
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Originally Posted by rccardr
There is, admittedly, some variance in IM seatpost diameters. All of mine have been 27.0, across 85-86-87-88, but know that others have used a 27.2…although don’t know if those were from the factory or aftermarket fits.

At any rate, better to buy a new and longer post than have the insertion line above the lug. It’s there for a reason and put there by smarter people than us. Well, me, anyway.
Already done. A carbon 27.2 that slid right in.
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