I've done a couple of searches and for the most part everyone that has a Holz skid under their RX-1MNT has said they work really well. My questions is since we don't have the mountains here in Northern Ontario is the Holz skid worth the money. I ride as much off trail as possible ( small hills, rivers, lakes, etc). I was looking at the Holz or the K-mod but the Holz on sale ($1000) is near the same price and you get two new shocks instead of reusing your old front shock. I thought about the M7 skid but alot of guys talk about an unknown vibration. Besides I really like the way Kachess stable of sleds work. 
Jigger
Jigger
Rx1M5
VIP Member
I think that when you put the Holz side by side with an M7 skid you will see that they are very similar as far as the geometry goes. The vibration that seems to be present on the M7 skid is a by-product of 2 things IMO. First when you use a 153 skid for a 162 track you have a pretty big pullback which reults in the track flapping between the drivers and the rail tips. Even with the antistab kit you'll still get movement up and down. The second thing is that the 3.0 tracks seem to just plain vibrate more than the 2.52 tracks. My Rx1 has a 162 M7 skid with a 162 3.0 Maverick and I have a small vibration in mine but not too bad. I'm using 8 tooth 3.0 drivers cause I have a drop and roll and I've got the clearance, the 7 tooth 3.0 drivers vibrate worse for sure, it's just got something to do with physics and sine waves etc. My buddy has a 159 2.52 Doo track on his Rx using a 153 M7 skid and he has no vibration. I wouldn't be scared of the M7 skid over the Holz and you can pick up a titanium version for about 1/2 of the Holz sale price which will be as light as the Holz. If you are worried about vibration you might want to stick with a 2.52 track and 8 tooth drivers over any 3.0 combo.
Rx1M5
Rx1M5
yamahaboy_15
Extreme
i would have to ask you one question jigger what type of riding do you do because that is what it is all about we the holz but that is because they handel so well and if your just going to be riding in the flats there is no purpose for it but if you are riding in some what where you need that suspension to transfer then yes i would have to say yes definitley buy it we were thinking the same thing is it really necesary and yes that is a big weight savings and it will perform better now handling we moved the rider forward on ours and she handels way better and looks clean for a chopped up sled. 
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