Motorcycle Racing Forum

Motorcycle Racing => Wrenching => Topic started by: Xian_13 on January 17, 2003, 03:02:59 PM

Title: Free Sag??
Post by: Xian_13 on January 17, 2003, 03:02:59 PM
How do you measure free sag?

By adding or subtracting Sag, what FXs are there?

And what is a good Starting pointof sag, for a guys trying to learn what his sespention is doing?

Title: Re: Free Sag??
Post by: Dawn on January 17, 2003, 03:37:45 PM
QuoteHow do you measure sag?


You try and pass the pencil test without leaning back and holding your breath.

Dawn   ;D
Title: Re: Free Sag??
Post by: Xian_13 on January 17, 2003, 04:37:16 PM
Well I passed that test, but thats because I have yet to grow man boobs....
Title: Re: Free Sag??
Post by: sportbikepete on January 17, 2003, 05:59:58 PM
FX's ? What may I ask are FX's.
Title: Re: Free Sag??
Post by: sportbikepete on January 17, 2003, 06:00:37 PM
Effects?
Title: Re: Free Sag??
Post by: Xian_13 on January 17, 2003, 06:06:51 PM
Yes, effects...
Title: Re: Free Sag??
Post by: sportbikepete on January 17, 2003, 10:03:32 PM
Always go with the first instinct. lolol
Title: Re: Free Sag??
Post by: EX#996 on January 18, 2003, 01:52:19 AM
QuoteWell I passed that test, but thats because I have yet to grow man boobs....

LOL !!!!!

I was wondering if you would understand.  Good job!

Dawn   ;D
Title: Re: Free Sag??
Post by: mdr14 on January 18, 2003, 02:43:46 PM
oh heck I thought you were giving out " Free" sag, I wanted some. :(
Title: Re: Free Sag??
Post by: tzracer on January 20, 2003, 09:02:32 AM
Measuring free sag. You will need a helper or 2.

Lift the bike so that the rear suspension is not supporting the weight of the bike. Measure between a point on the swingarm (usually the rear axle or end of swingarm) to a point on the frame (I try to use a point such that the measurement is close to verticle). Lets call this measurement A. With the rear wheel supporting the weight of the bike, push down on the rear of the bike and let it return. Take a measurement using the same points as before. Call this measurement B. Lift up on the rear of the bike and let it drop on its own. Repeat the measurement, call this C. Take an average of B and C ; (B+C)/2. subtract this average from A. This will be the free sag.

Around 5 to 10 mm is a good starting point.
Title: Re: Free Sag??
Post by: unforgivenracing on February 12, 2003, 05:50:25 PM
This was covered very nice in a Cycleworld mag/rag a few years ago.  Three people (including rider)work best.  ;D