|   02 Psylo not getting full travel....HELP!!!! | gra$$ya$$
Jan 7, 2003 1:40 PM | | Hi,
I've got an 02 Psylo and it's never been getting full travel, but I thought that it just needed breaking in. It's been a while and still not getting full travel.
I've tried draining all the oil and putting in the required amount, but it still not getting full travel.. I'm missing about 1"...
Does anyone have any suggestions?? |
| Which Psylo--model?--nm | TNC
Jan 7, 2003 4:45 PM | | |
| 02 Psylo SL .....nm | gra$$ya$$
Jan 7, 2003 7:35 PM | | |
| Yeah, I'm seeing the same thing - false advertising? | Bumpy
Jan 7, 2003 5:08 PM | | I just got a Liquid 10 which uses a Psylo C claiming 80 to 125mm.
Heck there are even handy marks on the fork tube. In full length 'U-Turn' setting the mark only goes to 115mm. If I pull up hard on the fork it maybe goes to 118mm or so. With sticksion just sitting there at rest, the mark is usually sits at the 100mm mark.
Anyway, on my ride I put a zip tie on and when trying to compress the fork fully, I only get about 100mm of actual measured travel shown.
Where's the other 25mm? Perhaps an email to Rockshox is in line. |
| Psylo's never compress all the way to the crown.... | Monte
Jan 7, 2003 6:06 PM | | there is always about 20mm of stanchion that never gets used for travel. |
| Psylo's never compress all the way to the crown.... | gra$$ya$$
Jan 7, 2003 7:41 PM | | yes this is true... but I've put a zip tie on the stanchion and basically done my best to fully compress the fork... ie. bike upside down, wheel off and a towel wrapped around each hand, jumped on the the damn thing and still only get about 110mm of travel max... if I unscrew the "caps" off the stanchions... then I'll get 125mm... so where has the other 15mm gone?? |
| Some experience with SL | TNC
Jan 7, 2003 8:12 PM | | I had an '02 on my '99 FSR. It was sprung too stiff for me, and I was preparing to get the next lighter set. I work at a shop and sold it instead, and bought a Psylo Race. The guy I sold it to purchased the lighter spring, and we installed it. It gets all its travel now. Another riding buddy bought the heavier spring for his girth and riding style. It may just be that you need the lighter spring. I see you checked to make sure there wasn't too much oil in the legs, because some of these have had too much which limited some of the travel. |
| thanks... I will try getting a lighter spring ....nm | gra$$ya$$
Jan 7, 2003 8:40 PM | | |
| I get full travel.... | fonseca
Jan 8, 2003 1:29 AM | | But I didn't when I added too much oil after my first rebuild. And if you are soaking the foam rings in fork oil occasionally, you could be adding oil. But if you know everything is correct, I would guess springs as well. |
| how to measure | gaston
Jan 8, 2003 3:05 PM | | YOU CANNOT GET FULL TRAVEL ON ANY FORK WITH THE CORRECT SPRING FOR YOUR WEIGHT INSIDE IT!!!!!!!
Now that I've vented, here's the deal. If you have a spring in a fork and compress you are doing what the fork does when you ride it. Do you want a fork to bottom with your body weight? Probably not. Here's how you measure max travel on any fork. Remove all spring tension (i.e. coil fork remove the spring, a u-turn RS just take the cap off; air fork remove the valve core (can't just release air). Now compress it. That is your max travel. With the spring you are just fighting spring rate. Cheers. |
| i sorta agree ... but.. | gra$$ya$$
Jan 9, 2003 1:58 PM | | when there's a whole inch missing there is something wrong. I'm not just talking about pushing don on the damn thing... I quitely confident that I'm applyin at least 3x my body weight on the fork, which should at the very least use up most of the travel.
But even on the trails the zip tie show the same results.
I can do the same thing with my Fox Vanilla and Z1 and both will compress to within about 5mm |
| Here is the answer- email recieved from RockShox themselves | Bumpy
Jan 9, 2003 2:55 PM | | Here is the very nice, next day answer email I got from them on the subject.
"The travel gradients on the U-Turn forks are imprinted as guide to show you what position the fork is set at, not a measure of travel. The last "numbered" hash mark is at the 115mm position but there are two hashes above that point. Why? At full extension there is a slight variance (+/- 3mm) in the spring's length, that is the tolerance in the overall spring length. So at full extension your fork could get anywhere from 122 to 128mm of mechanical travel. You might not match up with the gradient as the gradient is not the measure point, it's just a guide to show where the fork is set.
So why do you only get 105mm of travel? With a spring installed and just pushing down on a fork it is impossible to get max travel. There is an elasotmer inside the U-Turn spring (you'll see it if you remove the spring) that acts to increase the spring rate in the final part of the fork's travel. This prevents a harsh bottom out. At full travel you'll hit the top of the elastomer at around the 110mm mark. When riding the force that it absorbs is a product of weight and velocity, you could not duplicate the impact of a 5 foot drop just by pushing on the fork. How much travel you use on a ride is based on what you're hitting and the spring rate of the fork. If you're not hitting any bump that would require more travel to absorb then that's all you'll use, a lighter spring would obviously give you more travel, a heavier spring less travel. Just a matter of setting up the fork for your conditions. To measure your maximum available travel at any given setting you would need to extend the fork, remove the top cap of the spring side (to release the spring tension), compress the fork and measure the travel. Hope this explains it, feel free to email with any other questions.
Chris,
SRAM Technical Service" |
| spring rates | Gaston
Jan 9, 2003 3:19 PM | | Actually you are getting most of the fork's travel. 4 out of 5 inches. How much you can compress a fork with the springs inside is simply a matter of how stiff the springs are vs how much force you are applying. Unless the spring rate in all the forks is the same you're comparing apples to oranges. Try this if you don't believe me-take the springs out. Is the fork easier to push? Well that's the lightest spring (i.e. no spring). Put those springs back in. Gets harder to push, right? Same applies if you put a stiffer spring-that's why there are different rate springs for coil forks. |
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