Actually those DRCV shocks had more in common with MRP's ramp control than with this dual-chamber setup. This is a universal version of Manitou's IRT. Two chambers inline, one approximately at double the pressure of the other.
Yer. Local boys here SD Components have had this available for a couple years as well.
I don't think SD Components is trading at the moment.
They're still going. Simon is just being crap I guess. Their Insta is still strong and they're in stock locally.
I have the IRT in a Mattoc which is basically the same thing, a second air chamber separated by a floating piston.
It's essentially a dual rate air spring.
I think linear and progressive are being used to describe different things here. I'm interpreting it that the air spring is progressive, but the rate at which spring rate increases is not linear if that makes sense (the curve is droopy). So spring rate stays low for a good bit of the initial travel and then ramps up a lot at the end--so you can blow through the mid-stroke which sucks. Thus, to get the right amount of mythical mid-stroke support, you have to run more air pressure, which impacts the sensitivity to small bumps or add tokens which means you can stop getting full travel. I experienced this with my Pike.
I'm with sammich on this. I'm a little confused. I installed a Luftkappe in my Pike last year, to go along with the Tractive tune to my Monarch. Chassis stability from the Monarch was impressive. In fact, in my 20+ years of riding, it was the first time I'd ever felt chassis stability.
this makes sense- linearly progressive vs rampy at the end of travel. That was part of my issue with my evil, felt like nothing then loads of ramp right before bottom out (also the shock sucked). I thought this would emulate the flatter rate of a true coil spring with no air assist. thanks for the info
Yes, but what effect does this have on the fork as it goes through its travel? If I'm reading this correctly:
yes, the initial pressure on the primary chamber is higher with the IRT than without it, but it doesn't impact performance the way you're thinking because when you add the IRT the size of the primary chamber is reduced by a pretty good amount. you can actually get better small bump compliance (depending on where you set the primary chamber pressure)
speed doesn't matter, its not a factor in boyles law (regarding the relationship of pressure and volume). but yes it generally gives better mid stroke support, and it will probably ride a little higher in its travel (depending on what travel and pressures you're running).
in my experience, no, you don't feel it. you might be able to pick it up on a dyno, but when riding it isn't perceptible.
My electric dirtbike currently has a 2007 888 ATA with the exact same system. Back when I had one on my DH bike the hot mod was to remove the floating tethered piston and make the main air chamber bigger. Right now I'm running the same pressure in both chamber to make it as linear as possible and might remove the parts to increase volume.this gif does a better job
that was probably when they were still using a dummy rod right up the middle of the bidness
ah yes, that's right. ten points to Gryffindor. now i remember - i think i've gone down this rabbit hole before, the newer air spring required for the runt can't be retrofitted to the earlier models, right?
Get a mrp fulfill and it will be.
it would have to be the fulfill and the 2018 air spring as well, no?
interesting! i just watched the install video for the MRP ramp control and it makes more sense now. but obviously installing a runt instead of the ramp control.
