Anyone running one? Interested to hear how they run, only found a few reviews online but all overwhelmingly positive…
Sent from my iPhone using Tapatalk
Sent from my iPhone using Tapatalk
Formula Mod shock
philstone
21 - 40 of 76 Posts
Joined
·
263 Posts
Hi guys, by any chance could any of you confirm if their Formula MOD does a small "click" when transitioning from Compression to Rebound ? All the shocks I had before this were completely smooth, same for forks and the only time I had the problem was on a Mattoc in which the check valve spring on the rebound shaft was broken. So do you all have this on your MOD or does mine have an issue ?
My does it too also some others which I saw did it
Joined
·
50 Posts
What happend? What bike do you have?
Joined
·
1,328 Posts
EXT/RS/Formula springs should all be interchangeable assuming the spring has enough stroke for the shock.
Basing that on having a Mod with Formula spring, EXT spring, and selling a 2022 SD Ultimate that came on a frame I bought and measuring/test fitting springs on it.
I had some issues with rubbing on a 2021 Mod right here with a Formula spring:
![Image]()
IIRC Alba Distributing (where I got it) said that Formula was going to revise that piece for better clearance and likely has already in looking at photos of the shock on the Formula web site.
The workaround I used was an EXT spring that seemed to have slightly more clearance on the ID of the spring.
Basing that on having a Mod with Formula spring, EXT spring, and selling a 2022 SD Ultimate that came on a frame I bought and measuring/test fitting springs on it.
I had some issues with rubbing on a 2021 Mod right here with a Formula spring:
IIRC Alba Distributing (where I got it) said that Formula was going to revise that piece for better clearance and likely has already in looking at photos of the shock on the Formula web site.
The workaround I used was an EXT spring that seemed to have slightly more clearance on the ID of the spring.
So the formula spring seems to have a length of 130mm, VS the rockshox 151mm (for 205x65mm). Would that be too short/need an adapter? So hard to find this info, i've searched/asked around but you're the only answer I got haha!
Joined
·
1,328 Posts
The way to verify that is to see what the distance is between the end of the shock and the lowest that the collar will go:
![Image]()
And here is another shock that has more threads on the shock body:
![Image]()
And Mod for comparison:
![Image]()
That yellow line needs to be the same or shorter than the total length of the spring. So long as that is true and the coil has enough travel for the shock then you are money.
That Mod photo is from a 2021 Mod that I had, newer Mod shocks look similar, possibly slightly less threads on the shock body.
As an example, that Mod is 205x65 and I was using an EXT 450 pound C65 spring so 65mm max travel and the spring is 110mm in total length which fit just fine lengthwise on the Mod.
You can use an adapter as well to sit between the upper collar on the shock and the spring, SAR makes them, just have to match the inner diameter of the spring.
And here is another shock that has more threads on the shock body:
And Mod for comparison:
That yellow line needs to be the same or shorter than the total length of the spring. So long as that is true and the coil has enough travel for the shock then you are money.
That Mod photo is from a 2021 Mod that I had, newer Mod shocks look similar, possibly slightly less threads on the shock body.
As an example, that Mod is 205x65 and I was using an EXT 450 pound C65 spring so 65mm max travel and the spring is 110mm in total length which fit just fine lengthwise on the Mod.
You can use an adapter as well to sit between the upper collar on the shock and the spring, SAR makes them, just have to match the inner diameter of the spring.
If you contact formula (service@rideformula dot com) they will provide you with service manuals. That's what I did when I was curious about self service of the MOD shock and they sent them over. Pretty cool service from Formula if you ask me.
If they don't answer send me a pm with your email and I'll forward the manuals to you.
Joined
·
263 Posts
For those that it might interest I dismantled my Yellow and Orange CTS. I found 2 things that are rather interesting. First one the stack on the orange CTS is twice as stiff as the one on the Yellow CTS which leads me to believe that the difference between those two is mostly due to shimstack rather than piston profile. The other interesting finding was that the piston profile is grooved, kinda like the Hotdog piston from RS but all around. In other words the shims are not closing the faces of each of the holes you see on the back side of the piston, instead they seal a circular groove. This reinforce my belief that the difference between the Orange and Yellow CTS is mostly due to their stack. I counted 15 holes for the Orange, VS 12 for the Yellow but I don't have the tools to measure precisely the size of the holes in the piston. But it doesn't seem much different. Considering that the piston face is a big ring rather than individual opening the difference in hole size and number would only have an impact on very very high speeds where one piston could limit the flow more than the other one.
I didn't get a chance to open the Green CTS as it is the one I am currently using. But for those with only Yellow or Orange you could probably skip buying the one you don't have and instead just buy some shims, which would be a lot cheaper. If nobody can do the Green CTS I will do it when I will service my shock this winter.
Here are the stacks:
I didn't get a chance to open the Green CTS as it is the one I am currently using. But for those with only Yellow or Orange you could probably skip buying the one you don't have and instead just buy some shims, which would be a lot cheaper. If nobody can do the Green CTS I will do it when I will service my shock this winter.
Here are the stacks:
| CTS Yellow | Equivalent in 0.1mm Shim | CTS Orange | Equivalent in 0.1mm Shim |
| 18x0,12 | 1,7 | 18x0,2 | 8 |
| 18x0,12 | 1,7 | 18x0,2 | 8 |
| 18x0,12 | 1,7 | 16x0,15 | 3,4 |
| 16x0,12 | 1,7 | 16x0,15 | 3,4 |
| 16x0,15 | 3,4 | 14x0,15 | 3,4 |
| 14x0,15 | 3,4 | 14x0,15 | 3,4 |
| 14x0,12 | 1,7 | 29,6 | |
| 15,3 |
Joined
·
263 Posts
No it isn't, at least not measurable with the tools I have.
Without getting into the exact details, this all seems to roughly line up with the graphs Formula posts? The damping curves shift up in damping force through the whole range, while also slightly changing shape at the high end of shaft speeds when comparing yellow vs orange. Will be interesting if you get a chance to compare to the green shim stack and piston too. Thanks for posting this info!
Joined
·
263 Posts
This is only an educated guess but yess the stack profiles seem to match the graphs and also seem to confirm that the piston difference between orange and yellow is only a gimmick. Actually I forgot to measure if the groove is wider on one vs the other but visually they looked identical. Now unless the green piston has a very different face profile with idependant ports I basically jsut expect to see a much stiffer stack. And considering the knee from id to high speed I suspect that the overall port surface is lower than orange and yellow to create the bend in the camping curve. This is not something that should be acheivable just playing around with shims.
Joined
·
11 Posts
Hi guys, FYI:
![Image]()
21 - 40 of 76 Posts
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
