Mountain Biking Mountain biking is one of the fastest growing sports in the world. Check out this forum to discuss the latest tips, tricks, gear and equipment in the world of mountain biking.

Fox float w/ propedal

Old 04-05-04, 01:30 PM
  #1  
Eric
Member
Thread Starter
 
Eric's Avatar
 
Join Date: Apr 2002
Location: Fenton, Michigan
Posts: 48
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Fox float w/ propedal

Anyone here have a bike with this rear shock? I just got my new stumpjumper FSR w/ propedal and I am having the hardest time setting it up. The ride seems so harsh compared to my old fox float on my 2003 kona. I have read that I should set the sag to at least 25% of the shock stroke compared to 1cm sag used on my old shock. This seems odd because I would think that I would be losing 25% of my 4" travel (3") as well as lowing my BB at least an inch. I am not a shock expert and I could be wrong about what sag actually does. Does the shock just need a break in period or something? Should I just go out and hit as much stuff as possible to work this thing? Any input would be greatly appreciated. Thanx
Eric is offline  
Old 04-05-04, 02:47 PM
  #2  
Maelstrom 
Wood Licker
 
Maelstrom's Avatar
 
Join Date: Apr 2002
Location: Whistler,BC
Posts: 16,966

Bikes: Trek Fuel EX 8 27.5 +, 2002 Transition Dirtbag, Kona Roast 2002

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 23 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
25% is average for a trail bike. I run my sag at around 33% give or take. Remember you aren't loosing the travel, just changing it to the negative side. There is nothing wrong with having that travel there in case you do drops and such. Forks also run a long sag in comparrison to their actual travel.

Since you are used to no sag you could run 20% as long as you won't overextend your travel and bind your spring
Maelstrom is offline  
Old 04-05-04, 03:12 PM
  #3  
BlackDiamond
Senior Member
 
BlackDiamond's Avatar
 
Join Date: Oct 2003
Location: So-Cal
Posts: 334

Bikes: 03' BigHit Comp/DH

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
No you'll want to set up the sag correctly.
BlackDiamond is offline  
Old 04-05-04, 03:44 PM
  #4  
Maelstrom 
Wood Licker
 
Maelstrom's Avatar
 
Join Date: Apr 2002
Location: Whistler,BC
Posts: 16,966

Bikes: Trek Fuel EX 8 27.5 +, 2002 Transition Dirtbag, Kona Roast 2002

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 23 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Oh and do you have too heavy a spring? And I forget can you change the progression on those bikes. I know you can on bighits?
Maelstrom is offline  
Old 04-05-04, 06:01 PM
  #5  
Eric
Member
Thread Starter
 
Eric's Avatar
 
Join Date: Apr 2002
Location: Fenton, Michigan
Posts: 48
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by BlackDiamond
No you'll want to set up the sag correctly.
I found something out interesting. I was pumping the shock up to say 165lbs and when I remove the pump, I hear air leaving. I was told that this was just air leaving the air tube attached to the pump. I then reconnect the pump to find out that I have about 145-150lbs in the shock. My sag appeared at about 25% though...hmmmmm? I then over pump the shock up to say 180lbs and it seems to work a little better on the little stuff and I have around 25% sag still. I then take the bike for a spin and play with the rebound a things seem a little better. Is there a break in period for these shocks? Should I go out and just work the thing? My pump is only a year old (Wrench Force Pump), I got with a 2003 Kona.
Eric is offline  
Old 04-05-04, 06:03 PM
  #6  
Eric
Member
Thread Starter
 
Eric's Avatar
 
Join Date: Apr 2002
Location: Fenton, Michigan
Posts: 48
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by Maelstrom
Oh and do you have too heavy a spring? And I forget can you change the progression on those bikes. I know you can on bighits?
I don't have a coil over shock. Maybe you think I am talking about a front shock. It is a rear air shock (2004 stumpjumper FSR)
Eric is offline  
Old 04-05-04, 06:14 PM
  #7  
Maelstrom 
Wood Licker
 
Maelstrom's Avatar
 
Join Date: Apr 2002
Location: Whistler,BC
Posts: 16,966

Bikes: Trek Fuel EX 8 27.5 +, 2002 Transition Dirtbag, Kona Roast 2002

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 23 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by Eric
I don't have a coil over shock. Maybe you think I am talking about a front shock. It is a rear air shock (2004 stumpjumper FSR)
oops. Then I probaby can't help anymore. I only use coil and they react and feel very different
Maelstrom is offline  
Old 04-05-04, 09:31 PM
  #8  
Structure0
Member
 
Structure0's Avatar
 
Join Date: Aug 2001
Location: SLO, Ca
Posts: 27

Bikes: Super V (Can-Endo)

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by Eric
I found something out interesting. I was pumping the shock up to say 165lbs and when I remove the pump, I hear air leaving. I was told that this was just air leaving the air tube attached to the pump. I then reconnect the pump to find out that I have about 145-150lbs in the shock. My sag appeared at about 25% though...hmmmmm? I then over pump the shock up to say 180lbs and it seems to work a little better on the little stuff and I have around 25% sag still. I then take the bike for a spin and play with the rebound a things seem a little better. Is there a break in period for these shocks? Should I go out and just work the thing? My pump is only a year old (Wrench Force Pump), I got with a 2003 Kona.
It is my understanding that the the hiss of disconnect is, indeed, the air leaving the pump and tube. When you reconnect to the shock and take a new measurement, the pump and gauge fill from the air in the shock and thus, pressure being equal, the new measurement is slightly lower. What this means is that you don't have to "overfill" the shock to account for the disconnect. Just fill it to the desired pressure and disconnect. The check valve in the shock will insure that the pressure stays the way you set it. When you attach your shock pump next time and see "oh, my shock is down 10lbs" or whatever, it is because you have attached the pump and bled the shock to fill its chamber and the gauge, not because you lost pressure when you orignially disconnected.

That being said, I'm none too sure about ideal pressures. I've tried higher pressure slower rebound, lower pressure higher rebound, and mid-level on each and I'm not sure what is better. I'd like to see some more knowledgable tuners posting their settings... Me--one not-knowledgable tuner--I put my Fox RL at about 5lbs under body weight and set my damper at about two clicks faster than halfway. For "racing" I up the pressure by about 10lbs over body weight and set the rebound about midway.
Structure0 is offline  
Old 04-06-04, 06:12 AM
  #9  
Al.canoe
Senior Member
 
Join Date: Dec 2003
Posts: 1,295
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I don't do sag. I set the pressure at my dressed body weight plus the weight of my hydration pack to start with and trimmed from there. I wound up about 15 lbs more than that on our local trails. The bike is a 2003 Stumpjumper FSR Disc.


Al
Al.canoe is offline  
Old 04-06-04, 09:46 AM
  #10  
BlackDiamond
Senior Member
 
BlackDiamond's Avatar
 
Join Date: Oct 2003
Location: So-Cal
Posts: 334

Bikes: 03' BigHit Comp/DH

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Eric, you are right on track. Yes you new shock will require a break in period. Your ride should improve as all the bushings etc...settle in. Good luck!
BlackDiamond is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
beatlebee
Singlespeed & Fixed Gear
20
12-09-18 03:57 PM
brianblackheart
Mountain Biking
3
08-17-12 05:31 AM
karma15
Road Cycling
13
09-22-08 05:23 AM
Portis
Foo
14
04-08-06 06:11 PM
neev1073
Mountain Biking
3
04-28-05 12:24 AM

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.