Sag Setting Tool for dirt bike suspension

Setting the race sag is always shown as a two-man job unless you had an aftermarket sag setting tool.   Also since I’m at the track alone most the time, I always found it to be a pain when I try to do it myself.  I looked around online and thought most of the digital sag setting tools were a little pricey.  I came up with a cheap sag setting tool and an easy way for me to set it by myself.

Making the sag setting tool from a yardstick

To make the sag setting tool, I bought a cheap aluminum yardstick, some green painters tape, and a sharpie marker.  Notch the end of the yardstick so that it will slide into the rear axle.  Give yourself about 4-5 inches so it will stay in the axle and bend the end at 90 degrees.

Make the notch just wide enough to fit in the hollow axle.  It should have a little room to move around, but not to lose that it will easily fall out.  Also, make sure it’s long enough to slide into the axle and have some room to move in and out.  When you are reaching around to read the marks, you want the tool to be able to move around, but not fall out.

 

Setting marks at common sag settings

Wrap the top of the ruler with tape and with the sag setting tool in the axle, mark a reference point on the rear fender with the bike on its stand.  I used the borderline on my rear number plate.

Take the ruler out and measure down 100mm, 105mm, 108mm.  These are the common settings that I use.  You can use whatever sag settings you commonly use, and mark those on the ruler.  Now you can set your sag without needing a measuring tape or another person.  I found the ruler will stay in place when I’m adjusting on my bike and it much easier to turn and around and check the sag setting than trying to keep a tape measure in place and read it at the same time.