Mountain Biking - What fork do I have on my Rumblefish one?

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dremspider
07-18-11, 06:59 PM
I am trying to figure out how much oil to put in my Rumblefish one. The website says it is a "Fox F120 RL 29 w/E2 steerer, custom G2 Geometry, 51mm offset crown, 15mm thru-axle, 120mm travel". Looking at the Fox website on the amount of oil to put into the fork to replace it I have the options of:

According to Fox's website that contains the information on oil volumes, they have the options for:

2010, 2011 F120
(FIT RL, RLC & Remote dampers)

2011 F120
(FIT Terralogic damper)

2011 F120
(FIT Terralogic damper)

Some of these have very different values for the oil volumes. I dont see anything that quite fits the Trek description. What model do I have and more importantly what is the oil volume that is needed?

Fox website:
http://www.foxracingshox.com/fox_tech_center/owners_manuals/011/index.html


My bike:
http://www.trekbikes.com/us/en/bikes/mountain/singletrack_trail/rumblefish/rumblefish_i/#

Also which side is the dampening side in relation to the air valve? I think it is the side with the air valve is the spring side, just wanted to check.

Svr
07-18-11, 09:10 PM
It depends on if your fork has the FIT or open bath damper.

The open bath damper uses the same oil to lube the lower leg, so there's more of it.

I've never owned a FIT Fox fork, but if it has a red rebound knob on the top of the fork leg instead of on the bottom, you've probably got an open bath damper.
dremspider
07-19-11, 04:11 AM
Yep, it is on the top. When I open it up I will see how much oil pours out and see if it is an equal amount. If it isn't I know I have an open bath design. What is the difference between the two?

Thanks for the reply.

Svr
07-19-11, 07:36 PM
Open Bath: oil used for damping is also used to lube the sliding elements of the fork. Dirt that gets past the seals will not only ruin the stanchions and bushings, but will damage your damper too. Regular oil changes = good.

FIT: Oil in the damper is seperate from the semi-bath oil and does not intermix. It's considered superior because the oil to lube the sliding elements can be an optimal weight for its purpose, and the same for the damper. Also, while the semi-bath oil might get filthy during regular use, the damper oil remains relatively clean an can do its job well for a longer period of time.