In for responses.

I only have a couple of brief rides on my megnegged RT3 but it's been fantastic. It's bridged the gap to coil suspension with the addition of a nice smooth ramp up on end stroke.

my understanding is the negative chamber is for small bump and midstroke tuning, where as the positive is for bottom out. Experts correct me if I'm wrong please.

I started with 1 red token and 2 bands, I'm thinking of dropping to 0 tokens and 1 band in the negative, this is on a linear design frame too (stumpy evo)

very good product and from my brief experience with it so far a worthwhile one.

 

More negative volume goes hand in hand with more air pressure...

More negative volume = more SAG (softer initial stroke)
More air pressure = more spring rate everywhere

More Negative Volume + More pressure = similar initial stroke as small negative at lower pressure, but more mid stroke support.

End stroke progression is all about smaller positive chamber. But again, the larger negative with more pressure will have more bottom out resistance too because of the higher air pressure.

 

If only someone had a calculator that would plot the graphs showing what varying air chamber would do

 

Adjusting the air pressure increases or decreases the firmness of the shock more or less evenly throughout the entire range of travel. The volume spacers can be used to adjust the firmness of the shock at different points in the travel. Adding positive chamber bands makes the shock get firmer the deeper you get into the travel with very little effect at the top of the travel and the maximum effect felt just before bottom out. Adding negative chamber bands kind of does the opposite and makes the initial part of the travel firmer, which most people probably don't want, but it also makes the shock easier to bottom out if you already have zero positive tokens and your bike is still too progressive. I don't think most people would want to use negative and positive tokens simultaneously unless they want less midstroke support for some reason perhaps due to the leverage curve of their frame.



It's a little dated now, but there's this:

 

cool program just need to find how big the super deluxe specs like how big the negative chamber is

 

If you have some calipers, you could just pull the air can off and take a few measurements.

 

Yeah tried that awkward as hell, I'll give it a proper try when I have more time.

 

Fill up the can with water, then transfer the water into a measuring cup to get the volume, suck it out with a big syringe, etc...


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Any recommendations for a Kona Process 153 shod with a Super Deluxe RCT?

I've heard that you need a more linear shock tune for progressive frames and vice versa. I definitely do want more midstroke support but I still want to have a bit of progression.

I weigh about 150 lbs kitted up.

 

I think it’s worth a shot for sure. I’m sure glad I did it.

I think I’ve now found my goldilocks setup now. 1 band in the negative and 0 tokens. It does take a lot of pressure to maintain 30% sag (300psi) however you can induce movement in the shock just pressing down on the seat. With minimal bands the small bump is fantastic but has enough midstroke support and plenty of ramp up on my linear stumpy Evo.

Hats off to rockshox for the kit, it’s dead easy to install, very tuneable and although this isn’t a new invention by any means it’s good solution for those with a linear kinematic bike.

 

I think it's worth a shot for sure. I'm sure glad I did it.

I think I've now found my goldilocks setup now. 1 band in the negative and 0 tokens. It does take a lot of pressure to maintain 30% sag (300psi) however you can induce movement in the shock just pressing down on the seat. With minimal bands the small bump is fantastic but has enough midstroke support and plenty of ramp up on my linear stumpy Evo.

Hats off to rockshox for the kit, it's dead easy to install, very tuneable and although this isn't a new invention by any means it's good solution for those with a linear kinematic bike.

Thanks for this! Will order one today.

 

Has anyone around the 200 lb club tried out the MegNEG?

 

I'm 100kg so if my American is correct that's 225lbs?

Works sweet, but as I said, with minimal negative bands it takes a lot of pressure to maintain sag, but small bump is very supple.

 

Do you guys find that your trail bikes pedal less well with the Meg Neg canister? Like less of a platform?
No doubt it's coil like in feel, but not sure that is ideal for my purposes.
Thoughts?

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Thanks Brash you just cost me $95!

 

The MegNeg just got 5 stars over on VitalMTB:

https://m.vitalmtb.com/product/guid...t/guide/Add-Ons-Mods,114/RockShox/MegNeg-Upgrade-Kit,27225#product-reviews/3749

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Still have no idea if this is the correct choice for my Foxy 29.

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Mondraker Foxy 29'' 2018 - Linkage Design

The above is a link to a suspension and leverage analysis done by Spanish hobbyist, Antonio Osuna. Definitely a good place to start.

The MegNeg, as per the Vital review:

"The MegNeg works well with bikes having more linear, less progressive leverage curves."

This makes the Sentinel and the Kona Process 153 as good candidates for it.

However, I'm not quite sure if the Foxy 29 needs it. Note that the model on the blog link above had a coil shock on.

 

It sounds like the Meg Neg is a good fit for my Foxy's LR, even though I have no complaints at all.

Although my testing time is limited, I'm going to buy one and test it myself.

I did speak to Craig at Avy who I trust for my suspension service and he was more on the fence to the negative on this mod for my particular bike. But testing myself is the only way I'll know.

 

btw does anyone have kinematic charts for Megatower?

 

Linearly decreasing from around 3.4 to around 2.3 (depends on high/low short/long settings and other things)

Even if this sounds very progressive, it's important to consider specific shock rates because they are not consistent for different configurations of the same model, let alone different models.

A 57.5m stroke super deluxe will be quite a bit less progressive than a 65mm stroke super deluxe (debonair or megneg). This is because the compression ratio of the positive chamber drops when the stroke is shortened. Travel limiters takes up volumes which help but they don't counteract the effect completely.

 

I recently installed a MegNeg on a 2019 Trek Remedy 9.8. Install was very straight forward. Pressure is up 20% to get similar sag, one token (previously 2.5), and one band in the negative chamber.

Limited time riding it so far, but initial impression are good. All the reported goodness.

For comparison purposes, here is the leverage ratio chart for a 2018 Trek Remedy 8.

 

Does the MegNeg can change the pressure equalization point?

I would agree, there is definitely a balance between negative size and equalization point that can work well on some bikes but be junk on others.

 

Ordered.
Will update in about a month.

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Yep lol

 

Hi everyone,

I am new to this forum and mostly beginner in terms of suspension, so maybe my question is somewhat stupid... However this really buggs me for some months now:

Question has two parts:

1) I'm really struggeling to understand how (if at all!) MegNeg will affect results on shockwiz? Will i notice any effect or will it be "masked" somehow?

2) I initially thought that i could replace the progression from tokens that came stock in my jeffsy 27.5 (2 red ones) with the progression from MegNeg but at an improved small bump compliance. Is this true or did I get something wrong here?

Following the superb discussion in this thread I'm starting to think that I may does not need MegNeg with Jeffsy due to it's progressive levarge. But somehow i liked the feel (at the beginning of the stroke) MegNeg generates...

Thanks and greeting to everyone!
Marvin

 

Meg neg shouldn’t affect shockwiz as long as you are careful to recalibrate the compression ratio.

And yes the progression will replace the need for tokens. So if you like the thought of more compliance go for it

 

I am not a suspension expert, so I would like to know if it is worth to upgrade my Santa Cruz hightower V2 rear shox to the Meg Neg? I do not know how the Meg Neg affects VPP suspension?

 

https://enduro-mtb.com/en/rockshox-megneg-super-deluxe-shock/

 

Here's the forces graph of a Mondraker Dune and Hightower LT to show the effects of increasing neg volume. This is just using the default air spring specs in Linkage, not a Deluxe or Megneg spring curve specifically. So not the exact curve you would get but the general effect is the same, in both cases the only thing that changed was negative volume and a slight increase in pressure.

I matched pressures so they had similar bottoming force with the standard can, but no change in positive volume before and after. In both cases the sag will be more but with better support, but the sag increase is larger with the Hightower (hence the perceived "forced sag"

The Dune has a different leverage curve to the foxy but it is still progressive-linear-digressive so you can see how it effects the 2 different styles. The SC changges more in the initial part of the stroke while the mondraker changes more towards the end (its initial stroke was already OK)

 

Here's the forces graph of a Mondraker Dune and Hightower LT to show the effects of increasing neg volume. This is just using the default air spring specs in Linkage, not a Deluxe or Megneg spring curve specifically. So not the exact curve you would get but the general effect is the same, in both cases the only thing that changed was negative volume and a slight increase in pressure.

I matched pressures so they had similar bottoming force with the standard can, but no change in positive volume before and after. In both cases the sag will be more but with better support, but the sag increase is larger with the Hightower (hence the perceived "forced sag"

The Dune has a different leverage curve to the foxy but it is still progressive-linear-digressive so you can see how it effects the 2 different styles. The SC changges more in the initial part of the stroke while the mondraker changes more towards the end (its initial stroke was already OK)

View attachment 1304909

Thanks, this is essentially the effect I assumed the Meg Neg would have on my rear suspension.

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Anyone able to comment on the suitability of a Megneg air can for my Starling Murmur with a 210x55mm Deluxe RT3 at 175psi with 2 spacers installed.

I'm about 80kg/180lbs, sag is currently at 30% and I bottom out fairly often. Running Shockwiz it told me to add a spacer/pressure some runs, other runs it was all green so I guess a spacer wouldn't hurt.
The frame is pretty linear although a few people run coils on them, I was tempted but keen to try this first.
If I was to fit a Megneg how many spacers/bands would be a good starting point.

Here's an article with the leverage ratio: https://www.pinkbike.com/news/starling-murmur-review.html