Retrobike Forum Index

It is currently Thu Dec 08, 2016 1:29 pm

* Login   * Register * Search  * FAQ



Post new topic Reply to topic  [ 9 posts ] 
Author Message
PostPosted: Sun Jun 10, 2012 5:02 pm 
Dirt Disciple

Joined: Thu Jul 09, 2009 8:44 pm
Posts: 85
Finally relented and swapped out my Pace RC31 forks for set of 2012 Rock Shox 100mm Reba RLs. I've not had a set of suspension forks since my '97 Judy SLs, so much to learn.

Thankfully Rock Shox have provided an in-depth manual taking you step by step through the tuning process...

I'd be really grateful for some real-life pointers on the basics. I'm 12.5 stone and ride x-country. Is it always best to have equal pressures in the positive and negative chambers? 20% sag about right?

Cheers,

Nik


Top
 Profile  
 
 Post subject:
PostPosted: Sun Jun 10, 2012 6:52 pm 
Retro Guru

Joined: Sat Aug 20, 2011 5:14 pm
Posts: 341
Location: Newcastle
There is a formula online, which gives a better start point than the figures printed on the fork leg sticker (i have a 2011 reba 120mm travel)

The pos/neg should be within around 5-10 psi of each other apparently.

If you have them too far apart, one will overpower they other as you would imagine, the idea is to balance them to give you good sag while tweaking them to tune the fork to your taste.

IIRC i currently have mine set to 145psi pos and 140 neg, but i am a heavy chap and i like my hardtail bike to be a bit stiffer than my FS bike.

Pos bounces it upwards, neg pulls it back down,for example i find the closer i get my neg pressure to the positive, the more the fork wants to suck down on a bump, but i also tend to increase brake dive.

I could set it so it never brake dives at all, but then its going to be crap on the smaller bumps, endless possibility!


Top
 Profile  
 
 Post subject:
PostPosted: Sun Jun 10, 2012 9:02 pm 
Dirt Disciple

Joined: Thu Jul 09, 2009 8:44 pm
Posts: 85
Thanks S-M :)

Hopefully I'll have a chance to get out during the week and play around with the settings. A whole new world of fettling awaits!

Nik


Top
 Profile  
 
 Post subject:
PostPosted: Mon Jun 11, 2012 2:01 pm 
Old School Grand Master
User avatar

Joined: Mon Jun 25, 2007 8:37 am
Posts: 3146
Location: Whiskey bent & hellbound!
Rebas are nice forks, I was pretty blown away with how smooth and stiff they were when I got my hands on a set. TBH I'd start with equal pressures in upper and lower and go from there with around 20/25% sag


Top
 Profile  
 
 Post subject:
PostPosted: Mon Jun 11, 2012 7:11 pm 
Dirt Disciple

Joined: Thu Jul 09, 2009 8:44 pm
Posts: 85
Thanks Neil. The 2012s are much lighter than I thought. Not quite my RC31s though :shock: Need to get used to having a heavier front end. I eventually found some guides hidden in the depths of the SRAM website which give a run through of the basics. After that I think it's just tweak, tweak, tweak until I get something that works for me. I shall report back.

Nik


Top
 Profile  
 
 Post subject:
PostPosted: Tue Jun 12, 2012 11:18 pm 
Retro Guru

Joined: Wed Jan 18, 2012 12:37 pm
Posts: 426
Location: Derby
I'd start with 85psi in both chambers and take it out fit a ride.off it feels too soft try a but more air and vice versa.

Always do the positive chamber.first. I like to drain.the negative chamber before setting the positive chamber.


Top
 Profile  
 
 Post subject:
PostPosted: Wed Jun 13, 2012 1:26 pm 
Old School Grand Master
User avatar

Joined: Mon Jun 25, 2007 8:37 am
Posts: 3146
Location: Whiskey bent & hellbound!
nik_h wrote:
Thanks Neil. The 2012s are much lighter than I thought. Not quite my RC31s though :shock: Need to get used to having a heavier front end. I eventually found some guides hidden in the depths of the SRAM website which give a run through of the basics. After that I think it's just tweak, tweak, tweak until I get something that works for me. I shall report back.

Nik


You should be fine

I was surprised how stiff the Reba is for a non bolt through fork...tracks really well.


Top
 Profile  
 
 Post subject:
PostPosted: Wed Jun 13, 2012 5:11 pm 
retrobike rider
retrobike rider
User avatar

Joined: Thu Aug 13, 2009 1:01 pm
Posts: 1290
Location: Looking at my bike from the comfort of my sofa!!
nik_h wrote:
Thanks Neil. The 2012s are much lighter than I thought. Not quite my RC31s though :shock: Need to get used to having a heavier front end. I eventually found some guides hidden in the depths of the SRAM website which give a run through of the basics. After that I think it's just tweak, tweak, tweak until I get something that works for me. I shall report back.

Nik


I've just got hold of some 2011 (i think!!) Reba Race 100mm for my Voodoo..any chance of sending me that link...might come in useful!!!

Cheers


Top
 Profile  
 
 Post subject:
PostPosted: Wed Jun 13, 2012 10:38 pm 
Dirt Disciple

Joined: Thu Jul 09, 2009 8:44 pm
Posts: 85
Tuning guide:

http://cdn.sram.com/cdn/farfuture/pvj1aoSI4_YEw80U-umEMEpwdJXztWGrVKQ7pZuUwLE/mtime:1324592040/sites/default/files/techdocs/2001-2012_dual_air_tuning_guide_gen.0000000004160_rev_a.pdf

Nik


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 9 posts ] 

All times are UTC [ DST ]


Who is online

Users browsing this forum: No registered users and 10 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

About Us

Follow Retrobike

Other cool stuff

All content © 2005-2015 Retrobike unless otherwise stated.
Cookies Policy.
bikedeals - the best bike deals in one place
FatCOGS - Fat Chance Owner's Group

Powered by phpBB® Forum Software © phpBB Group