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Setting SAG

LaGrasta

LaGrasta

Cruisin' Guzzisti
Joined
Jul 12, 2012
Messages
109
Location
Mission Viejo, CA
Having recently acquired a 2003 V11, I now need to set SAG. I've set SAG on a few bikes, however not frequently enough to be familiar. There's plenty of How To videos, my question is more general. Is setting the rear SAG merely dividing the difference between at-rest and loaded? If so, wouldn't that vary depending on where the shock is set to begin with?
 
2003 Moto Guzzi V11 Sport rear shock travel – 128mm, 30% is ideal, thus 38mm drop when loaded

(About 30 Percent Give Or Take: The first thing you need to know is how much shock suspension travel your bike has (you can often get suspension travel specs from the manufacturer’s website). Then you need to calculate what 30 percent of that is. For example an Africa Twin has 8.7 inches of shock travel and 2.6 inches is 30 percent of that. Therefore, on an Africa Twin, you want the rear of the bike to drop about 2.6 inches from the fully-extended position with you, geared up, with luggage, if that’s how you typically ride.) from .advpulse
 
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Following. My roough understanding is that you need to find full travel, unladen sag (bike on its wheels alone) then rider sag. I think it goes that rider sag is about 30/35% of travel then unladen sag is a proportion of that so you can tell if springs are the right rate. This is where I get lost.
 
Search. Read. Watch. I've reposted the video link below from our YouTube channel. Bike is different, principle is the same. Start @ 2:45 secs in. Unladen, Static, Laden. All #'s are important to understand what is going on... and best to know springs and valving go hand-in-hand. You can't make either great until both are in range. Most bikes, especially Guzzis, never are without spending $... especially due to the age of the bike. I've done dozens of these and shock replacement is best, and we offer one of the best "magic carpet ride" services out there for the forks.

 
Thanks for the video, Todd. I actually watched this a few times in the past. The mystery for me was the starting point measurement, it was such a variable. I've now learned what I was missing, predetermined shock travel, for my V11, it's 128mm. Now I understand how to pick my target, and your video helped me understand how to adjust to achieve it.
Making matters a bit more involved, is I have to remove both the tank and airbox to adjust the rear shock. Then add those items back on for accurate weight.
In contrast, my V7 fitted with Traxxion forks and Wilbers shocks is easily accessed and highly adjustable.
 
LaGrasta said:
Thanks for the video, Todd. I actually watched this a few times in the past. The mystery for me was the starting point measurement, it was such a variable. I've now learned what I was missing, predetermined shock travel, for my V11, it's 128mm. Now I understand how to pick my target, and your video helped me understand how to adjust to achieve it.
Click to expand...
Welcome, and you're looking for wheel travel, not shock travel. For the Spineys it's 120mm front, 128mm rear.
Yes, getting to the rear shock without remote preload sucks. Many people ditch the air box because of it.
 
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