Setting up suspension sag properly is the first step to enjoying a mountain bike to it’s fullest, yet we often see riders on the trails riding bikes with woefully inadequate amounts of sag or air pressure. Part of the problem is a lack of education, but the other issue is getting a precise measurement. While Specialized bikes have an autosag feature, and some manufacturers put sag indicators on their frame, the majority of forks come with no indicators at all.
The UK based company Saggle has come out a with a very simple universal MTB Suspension Sag Tool, that makes the operation painless for shops and home mechanics. Each side of the Saggle has two different graphs printed on the side, which feature the sag measurements for different fork lengths. All you have to do is flip the tool to the appropriate fork length, have the rider hop on the bike, and compare the Saggle with your O-ring to dial in your sag.
The Saggle is only compatible with 100, 120, 130, 140, 150, and 160mm forks. You’ll have to resort to a measuring tape or eyeballing it on suspension forks with more than 170mm of travel. Interested? A single Saggle is £7.99, while the twin pack retails for £13.99.