Trek Mogul Extreme setup
- Thread starter Senri
- Start date
I have regular moguls and run them at 50psi (i weigh a spritely 100kg) and from what I can tell both legs are identical internally - compression dampening only, so don't be confused with the two air valves as their not like a modern pair of Sids etc with compression in one leg and rebound in the other.
Made by Showa, not bad a fork actually and IMHO one of the better forks of their time.
Made by Showa, not bad a fork actually and IMHO one of the better forks of their time.
Thanks. I did understand they are identical. Difference with the standard is that the extreme has compression/rebound setting on top and in addition it has air chamber size adjustment in the middle of the leg for changing the progressiveness. I am glad to hear they are decent forks though!
- Feedback
- View
Extreme (a 1994 fork) is the same as the Showa EX-7 and the same as the Black Diamond but with adjustable air volume.
Though I've never fettled one in the flesh so no real world experiences...
Anyway
<140lb Oil height is 54mm and pressure is 30-38PSI
140-180lb oil height is 49mm to 35-42PSI
>180lb Oil height is 44mm and 42-45PSI
uses 8wt oil btw.
in fact the pressures are the same for all models, though oil height and oil weight change between them.
travel is 1 3/4"
To pop the seals out on the extreme you have the advantage of the adjuster (again never done)
But fill the stanchions with oil to the brim and pop the caps back on.
Pump the fellers up to a high pressure then start to turn the adjuster to reduce the air volume and the seals should blow out... and the oil
Apparently if it gets hard, spanners and re topping up with oil if you can might be needed plus err if they'll like the RockShox MAGS the pressure involved can cause the leg part to become ballistic missiles
The way the Air volume changer works replaces the need for oil height adjustment you would normally do.
Adjust at low pressure, it's easier. You'll need to alter the pressure after anyway as changing it's volume changes the pressure.
As with oil height adjustment of others, a smaller cavity means you ramp up the spring rate quickly, a larger cavity means you stay at a more even spring rate through the travel.
Though I've never fettled one in the flesh so no real world experiences...
Anyway
<140lb Oil height is 54mm and pressure is 30-38PSI
140-180lb oil height is 49mm to 35-42PSI
>180lb Oil height is 44mm and 42-45PSI
uses 8wt oil btw.
in fact the pressures are the same for all models, though oil height and oil weight change between them.
travel is 1 3/4"
To pop the seals out on the extreme you have the advantage of the adjuster (again never done)
But fill the stanchions with oil to the brim and pop the caps back on.
Pump the fellers up to a high pressure then start to turn the adjuster to reduce the air volume and the seals should blow out... and the oil
Apparently if it gets hard, spanners and re topping up with oil if you can might be needed plus err if they'll like the RockShox MAGS the pressure involved can cause the leg part to become ballistic missiles
The way the Air volume changer works replaces the need for oil height adjustment you would normally do.
Adjust at low pressure, it's easier. You'll need to alter the pressure after anyway as changing it's volume changes the pressure.
As with oil height adjustment of others, a smaller cavity means you ramp up the spring rate quickly, a larger cavity means you stay at a more even spring rate through the travel.
