Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

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.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 04-30-06, 07:31 PM   #1
Chone
Senior Member
Thread Starter
 
Join Date: Jan 2006
Bikes:
Posts: 680
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
A few question about fork and brake setup...

I just got my new bike (check my thread ) and its nice and all however I have a few question about fork (RockShox Tora 318) and brakes (BB5) setup.

1. What are the pros/cons of a higher/lower preload and faster/slower rebound? I'm not sure how I should have each.

2. As far as brake lever feel go... is there a "right" setup or should you just go with whatever fits you? The brakes felt spongy and underpowered, I used the inner pad knob to bring the pad closer and they felt tighter and obviously more powerful and for me better but maybe there was a reason my LBS set them up like that, ??

The more you can contribute the better, thanks in advance.
Chone is offline   Reply With Quote
Old 05-02-06, 03:23 PM   #2
Chone
Senior Member
Thread Starter
 
Join Date: Jan 2006
Bikes:
Posts: 680
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
hmm, bump?
Chone is offline   Reply With Quote
Old 05-02-06, 06:02 PM   #3
mx_599
Lost in the Black Hills
 
mx_599's Avatar
 
Join Date: May 2005
Bikes:
Posts: 5,725
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Chone
I just got my new bike (check my thread ) and its nice and all however I have a few question about fork (RockShox Tora 318) and brakes (BB5) setup.

1. What are the pros/cons of a higher/lower preload and faster/slower rebound? I'm not sure how I should have each.

2. As far as brake lever feel go... is there a "right" setup or should you just go with whatever fits you? The brakes felt spongy and underpowered, I used the inner pad knob to bring the pad closer and they felt tighter and obviously more powerful and for me better but maybe there was a reason my LBS set them up like that, ??

The more you can contribute the better, thanks in advance.
**corrected**
since no one jumped in, i will attempt a short answer:

1) really no right or wrong, its what you like. couple general rules.

rebound:
  • fast- fork extends faster to meet demand of next bump in succession. depending on terrain, less R dampening/ faster R could offer a better ride (i.e. small stutter bumps). lack of dampening, forks could feel too springy...maybe cause washing out in turns (not settling) and deflection.
  • slow- lots of R dampening/ slow R the fork could "pack" up and not have the necessary travel to absorb a sudden larger hit. maybe a harsh bottoming as a result. also tendency for fork "to hang out" in harsh range of travel yielding poor ride quality.

preload:
  • too much preload- generally not good. in conditions "between" static (you sitting on bike) and near weight-less conditions from terrain, you want the fork to have some "play" to be able extend and follow contour of ground. no pre-load and the moment you "transition" to weightless states, if you will, your front wheel will simply want to leave the ground less control...
  • no preload- waste of travel...altered frame geometry, harsher range of stroke, etc...

both parameters will also alter frame geometry as well. preload more in a static state and rebound in a dynamic state. the effective head angle can be altered making for a more stable ride or twitchy ride.


suspension tuning is sort of like weight training. so many variables. as long as you can justify to someone why the heck you're doing what you are doing using the basic "proven" theories, you really cannot go wrong.

right Gastro?


anyone can chime in and correct the above!

Last edited by mx_599; 05-03-06 at 06:38 PM.
mx_599 is offline   Reply With Quote
Old 05-02-06, 06:04 PM   #4
mx_599
Lost in the Black Hills
 
mx_599's Avatar
 
Join Date: May 2005
Bikes:
Posts: 5,725
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Chone
2. As far as brake lever feel go... is there a "right" setup or should you just go with whatever fits you? The brakes felt spongy and underpowered, I used the inner pad knob to bring the pad closer and they felt tighter and obviously more powerful and for me better but maybe there was a reason my LBS set them up like that, ??

The more you can contribute the better, thanks in advance.
oops...brakes.

uhhh, yeah. i am going to defer this one to Gastro.
mx_599 is offline   Reply With Quote
Old 05-02-06, 06:27 PM   #5
mx_599
Lost in the Black Hills
 
mx_599's Avatar
 
Join Date: May 2005
Bikes:
Posts: 5,725
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
to OP. not too familiar with your fork, but i don't suspect it is THAT sensitive to adj. not sure about that though. i pretty much just ride my forks and don't stress over the settings too much. it is my general opinion that unless you have top of the line ones, they are not very receptive to adj...at least none of my low-mid ones. i have barely messed with my REBA. for me, not much to do with 4 inches of travel on one end. as long as it goes up and down i am happy.

however, here is a quick list of factors affecting MX suspension:

forks
~12" travel
compression (20+clicks)
rebound (20+clicks)
spring rates
fork oil height/viscosity
fork leg height in triple clamp
head bearing preload and/or steering dampener

shock
~12" travel
compression (20+clicks)
rebound (20+clicks)
high speed compression (2 turns)
spring rates
spring preload/ race sag
wheel base


now intermix all that and you can see the incredible amount of combos possible!! not trying to brag, point is this, it is kind of hard for me to get too excited about adjusting a hard tail with 4 inches of travel in a mid level fork. just ride!!!

i would imagine the MTBers with full suspension and nice quality stuff come much closer to what i mentioned above
mx_599 is offline   Reply With Quote
Old 05-02-06, 06:43 PM   #6
nodnerb
Senior Member
 
nodnerb's Avatar
 
Join Date: Jul 2005
Location: Wpg. Manitoba
Bikes: Mountain Cycle Rumble. Mostly xt and raceface built. Dirt Jumper 3. Avid BB7s.
Posts: 494
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
12" of travel?
nodnerb is offline   Reply With Quote
Old 05-03-06, 05:36 PM   #7
cryptid01
one less horse
 
cryptid01's Avatar
 
Join Date: Aug 2003
Location: East Jesus NY
Bikes: are better than yours
Posts: 5,600
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by mx_599
dampening



Quote:
Originally Posted by mx_599

preload:
[*]no preload- generally not good. in conditions "between" static (you sitting on bike) and near weight-less conditions from terrain, you want the fork to have some "play" to be able extend and follow contour of ground. no pre-load and the moment you "transition" to weightless states, if you will, your front wheel will simply want to leave the ground less control...
[*]too much preload- waste of travel...altered frame geometry, harsher range of stroke, etc...


<snip>

right Gastro?
Replace "preload" with "sag" and you're right on. (Preload on the spring controls the amount of sag.)
cryptid01 is offline   Reply With Quote
Old 05-03-06, 06:33 PM   #8
mx_599
Lost in the Black Hills
 
mx_599's Avatar
 
Join Date: May 2005
Bikes:
Posts: 5,725
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by gastro

Replace "preload" with "sag" and you're right on. (Preload on the spring controls the amount of sag.)
dampening
dampening
dampening
dampening


oops, yeah you're right as i wrote it above i should have put sag. i was trying to use the OP terminology when in reality, deep down inside, i wanted to say sag

i fixed it now...thanks for being the editor-in-chief

Last edited by mx_599; 05-03-06 at 06:39 PM.
mx_599 is offline   Reply With Quote
Old 05-03-06, 06:42 PM   #9
mx_599
Lost in the Black Hills
 
mx_599's Avatar
 
Join Date: May 2005
Bikes:
Posts: 5,725
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
chone....just adjust your brakes so they feel good. i am sure you will be fine with the way they are.
mx_599 is offline   Reply With Quote
Old 05-03-06, 07:12 PM   #10
Flak
Flatland hack
 
Flak's Avatar
 
Join Date: Nov 2005
Location: Nowhere near the mountains :/
Bikes:
Posts: 3,228
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I didnt notice alot of change from the knobs on mine chone. But im used to riding rigid so this whole fork thing is odd to me.
Flak is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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



All times are GMT -6. The time now is 03:37 AM.