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Not so important on a full suss as generally the front and rear sag equally so geo numbers will generally be the same for sagged vs unsagged (apart from bb drop).
As @Dammit said a hardtail essentially pivots under sag so HTA and STA get steeper. Reach also gets longer under sag as stack decreases. The longer the fork travel the bigger the changes. For example you’ll get approx 15mm reach increase under sag on a hardtail with 150mm forks
Alb
@Dammit
We discussed sag- the amount that the suspension compresses when you are on the bike, all weight on the wheels (not propping yourself up with one foot).
If it’s a hard tail then you’ll make the head angle steeper as the fork compresses, as it is getting shorter- make sense?