|   Please help me understand coil fork travel adjust mechanism? | Mario
Oct 13, 2003 6:33 AM | | I'm in the market for a coil/oil travel adjust fork and I would like to know if their travel adjustment mechanism all work the same way? Do they all affect the spring rate when you lower the travel, meaning that the fork will feel much less plush in the lower travel?
I know it's some kind of "screw/bolt" that pushes on the spring to reduce it's lenght but some manufacturer seem to be saying (in marketing words!) that spring rate is not changed and others don't talk about it.
For example, one of my friends has a Psylo and when he puts the travel at 100mm instead of 125, the fork still feels very plush which would kind of feel like the spring rate is not (or very little) affected.
So, any hints on how these are designed and if some are designed differently than others. I want to be able to use the fork I will buy in both the 5 and 4 inch settings.
Here are the models I'm looking at if you have specific comments on them...
RS Psylo SL, Magura Quake CP125, Minute One, WhiteBrothers VT1.3
Thanks for your help. |
| Not sure about the others but the Psylo is .... | Destroy
Oct 13, 2003 4:07 PM | | ..simply 2 springs in one fork that screw into each other. One spring stays stationary while the other spring screws in or out, raising/lowering with the adj. knob, about the stationary one. Very simple and it works well for what it does not effecting the spring rate drasticly like a preload knob would.
But IMHO I would choose a shock that has on the fly adj..
Stopping and screwing the front fork down or up 13 turns is simply very inconvienent when what you want to do is enjoy the ride. Look into the TALAS or ETC/ECC fork is my suggestion. |
| Ha, that explains it... | Mario
Oct 13, 2003 4:47 PM | | Thanks, that's why it stays very active even when lowering the travel. The WhiteBrothers has only one spring and they told me it does affect the spring rate when you lower the travel.
I don't mind stoping to adjust the travel, I don't plan on using it very often but sometimes I plan on running the fork at 100mm for a whole ride or when doing some fireroad climbing. I would prefer having a coil/oil fork so that's why I'm skipping on the Talas. I'm now hoping the Magura Quake is stiffer than the Psylo because as far as I'm concerned, this is the only weakness I have on the Psylo side...
Thanks for your explanation. |
| The U-Turn feature of the Rock Shox forks is actually a ........ | Bikeless Rider
Oct 15, 2003 5:41 PM | | ....small plastic piece, shaped a bit like a spacer, but smaller in diameter than the coil spring it resides in. It has two prongs on either side that stick out between the coils of the spring. This piece is keyed somehow to the shape of the rod inside the spring, so that turning the U-Turn knob, and thus the rod, will in turn rotate the plastic piece. The piece is not attatched to the rod, so it travels up or down the coils of the spring as it turns, thus utilizing different lengths of the spring depending on where it's positioned, and in turn not changing the spring rate. As far as I know, Manitou has some arrangement with their Minute 2 that has a similar effect, although I'm not positive. |
| Minute 2 is air but I read in a mag that Minute One... | Mario
Oct 16, 2003 1:27 PM | | which is coil/oil has some spring rate changes when you lower the travel so I expect that it's more like a simple preload, push down the spring type of gyzmo... wonder if the Sherman Firefly 04 will be like that also |
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