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pchansen

Sag settings-HOW?

6 posts in this topic

Alright, first thanks to all who helped me open the beast up. Now it's time to do the suspension. I ordered RaceTech's .47kg springs for the front and an Eibach 10.5 for the rear. With full gear I'm 6'5" 245lbs. My manual still hasn't come in yet either. My question. When adjusting the pre-load to set the sag , do most of you do it with the sub-frame removed and just stand on the bike while someone steadys and measures? I remember 105mm as being the number for static sag- is that correct? Also, where do you measure from and what is "race sag"?

I promise once I get my manual from Helm, I'll stop asking questions. Thanks again!

Paul

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I set my sag while in the attack position with all my gear on, but you can do this while sitting, standing, etc. The most important thing is to use the same method each time you check / adjust your sag. I also have someone around to help me balance and measure because doing it by yourself can be tricky and almost impossible if you want 'consistant' results. There's no right or wrong number that works best for everyone and all applications, so feel free to experiment in 5mm increments and find out what works best for your needs. Its pretty common to end up with 95mm to 105mm for a final setting, but experimenting with your suspension is a key to getting the most from it. The rear sag is typically set to about 1/3 of the rear suspension while the front should be about 1/6 of the travel as a starting point to work from on most bikes. Here's some links to check out with specific details. Enjoy :)

http://www.motocross.com/garage/suspensiontroubleshoot.html

http://www.motocross.com/garage/setracesag.html

http://www.shocktherapyracing.com/sagsettings.htm

http://www.mx-tech.com/tuning_offroad.asp

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Awsome information as always Qadsan! :)

The only thing that I can add is that I am about the same size (6'4" 245 w/o gear :D) and using the Race Tech online valving search tool it said for me to set the rear spring pre-load to 12mm. This did a great job of getting me in the ball park so setting sag was only a matter of fine tuning, instead of having to guess at an inital setting.

Good luck, and enjoy your springs it is one of the best upgrades you can do! :D

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Big_D,

When you say 12mm, are you measuring from the top thread on the shock body down to the top of the spring?

Paul

PS Thanks qadsan for all the advice- I wish you lived across the street!

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Sorry for not explaining better. What I mean by 12mm of preload is that you measure the free length of the spring (lenngth of spring with no pressure on it), and then tighten the collars on the shock so the spring is now 12mm shorter. Your new spring might be a slightly different length out of the box which is why you use the uncompressed length of the spring as the reference.

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I set my sag while in the attack position with all my gear on, but you can do this while sitting, standing, etc. The most important thing is to use the same method each time you check / adjust your sag. I also have someone around to help me balance and measure because doing it by yourself can be tricky and almost impossible if you want 'consistant' results. There's no right or wrong number that works best for everyone and all applications, so feel free to experiment in 5mm increments and find out what works best for your needs. Its pretty common to end up with 95mm to 105mm for a final setting, but experimenting with your suspension is a key to getting the most from it. The rear sag is typically set to about 1/3 of the rear suspension while the front should be about 1/6 of the travel as a starting point to work from on most bikes. Here's some links to check out with specific details. Enjoy :)

http://www.motocross.com/garage/suspensiontroubleshoot.html

http://www.motocross.com/garage/setracesag.html

http://www.shocktherapyracing.com/sagsettings.htm

http://www.mx-tech.com/tuning_offroad.asp

Thanks for the info. :D This was never real clear to me.

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