The best way link below. It uses a phone app to give you this info in your hand (or phone on your petrol cap).I’m looking for hints on how to measure sag by myself. Do I pull bike over on side stand then measure? I’m talking about rear end here. I’m about 120kg, also fat geezer. Got a Wilber’s on order but just want some comfort til it get here.
thanks
Motool Slacker Sag Measuring Tool
Motool V4 Slacker Sag Tool Adjusting suspension sag is the simplest, most overlooked change that you can make to dramatically improve the safety and handling of your bike. The Slacker allows you to place the tool in a learning mode so it can actually learn where the unweighted "zero point" is...
gtmotocycles.com
Also, welcome to the GT Forum, love to get your info on our Registry here; https://www.guzzitech.com/forums/threads/griso-registry-picture-thread-add-your-bike.1098/