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Stem advice
(lemmy.world)
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I'm pretty sure that the saddle height is determined by how long your legs and cranks are, and this has nothing to do with stems.
I would argue that standard calculations are all almost entirely useless. This (painfully long) article from Steve Hoggins talks about seat setback for road bikes: https://www.stevehoggbikefitting.com/bikefit/2011/05/seat-set-back-for-road-bikes/
Saddles being too high is a very common fit issue. Steve Hoggins has a ton of great information on his site about bike fits. For me personally, my saddle being too high felt right for my legs, but resulted in too much weight on my hands.
Part of the frustration of diy bike fitting is there really aren't that many symptoms. We only have three contact points to feel wrong, but way more things to possibly adjust. For me, the solution to my hand weight problem was a new bike one size smaller.
Here's the article about seat height: https://www.stevehoggbikefitting.com/bikefit/2011/02/seat-height-how-hard-can-it-be/