With handmade frames custom geometry is possible, and in fact it’s the norm.

There is only one correct size for each rider but it takes a professional bio mechanic to determine what this is. There are more than 3 measurements to consider when it comes to the ideal geometry for an individual rider so just because a rider can ride a stock bike, it’s highly unlikely that’s it 100% perfect. Despite general mis-conceptions everyone would benefit from a custom geometry and we calculate that 40% cannot correctly fit stock geometries.