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Caution: Binding Position on the Coomba

post #1 of 29
Thread Starter 
I like to mount my own bindings, and recently, I have been planning to mount bindings on a pair of K2 Coomba. By chance, a ski shop tech told me that K2 had revised the mid-sole position for the Coomba. The tech did not make much sense so I called K2 for clarification. Here is the story: early production skis with the mid-sole position marked in white are incorrect by 2cm. Later production skis with the mid-sole position marked with red are OK. Check: tail to mid-sole position should be 79.5cm for the 181 ski. Make sure your ski shop knows the difference. Ski-techs: call K2 for verification 206-805-4800. Incidentally, my Salomon bindings did not come with a mounting template, and I don't have a jig, so I am making my own template with AutoCAD. Johnnie
post #2 of 29
Thanks for the heads up :
post #3 of 29
K2 graph off by 2cm - not the first time is it! Clowns
post #4 of 29
I just got my 188s this morning, sexy but a little scary too :
post #5 of 29
Quote:
Originally Posted by Johnnie Crystal View Post
I like to mount my own bindings, and recently, I have been planning to mount bindings on a pair of K2 Coomba. By chance, a ski shop tech told me that K2 had revised the mid-sole position for the Coomba. The tech did not make much sense so I called K2 for clarification. Here is the story: early production skis with the mid-sole position marked in white are incorrect by 2cm. Later production skis with the mid-sole position marked with red are OK. Check: tail to mid-sole position should be 79.5cm for the 181 ski. Make sure your ski shop knows the difference. Ski-techs: call K2 for verification 206-805-4800. Incidentally, my Salomon bindings did not come with a mounting template, and I don't have a jig, so I am making my own template with AutoCAD. Johnnie
Wouldn't you rather just pay $25 for someone to mount the bindings with a Jig? I could never figure out why people would mount bindings on their own, without a jig.
post #6 of 29
Quote:
Originally Posted by Johnnie Crystal View Post
Incidentally, my Salomon bindings did not come with a mounting template, and I don't have a jig, so I am making my own template with AutoCAD. Johnnie
I haven't seen a paper binding template that came with a binding since the mid 1970's.
post #7 of 29
Quote:
Originally Posted by Gauthier View Post
Wouldn't you rather just pay $25 for someone to mount the bindings with a Jig? I could never figure out why people would mount bindings on their own, without a jig.
A jig is not fool proof. I have seen the interface between drill and jig fail, usually it has to to with beer input. But generally, I have to agree. I mount only what either I have a jig for, Salomon or what is predrilled.
post #8 of 29
Quote:
Originally Posted by ZOG View Post
I haven't seen a paper binding template that came with a binding since the mid 1970's.
my fritsches came with a paper template.

I've mounted a few pairs of my own bindings by hand without a jig. I'm technically inclined though too. (but I'm a dork like that.)

I've had two mismounts in my life, both mounted with jigs at western resorts; one pair mounted at Bridger, and the other pair mounted at Kirkwood.
post #9 of 29
Quote:
Originally Posted by Gauthier View Post
Wouldn't you rather just pay $25 for someone to mount the bindings with a Jig? I could never figure out why people would mount bindings on their own, without a jig.
Probably because they don't want to pay $25 to have some 16 year old stoner drop the jig and drill 16 missalligned holes in thier skis. Or drill one ski 2.7 cm back because they neglected to line it up. Or drill clean through. Or mistakenly mount someone's 12 DIN Markers on your Squads.

Mounting bindings isn't some weird voodoo rocket science.
post #10 of 29
Yep, there were paper templates with my Fritschis too.

I have mounted several bindings myself and it's not that difficult. I have never had a disasters - although my Dynafit TLTs have a little bit of skew. If you make a mistake yourself, it's somehow easier to accept than when someone else has done it!

Also - skis are not perfect! I start by drawing a centre line down the skis and I'm amaized at how curved this line could be. The longest rule I have is 1200mm so I mark the centre of the ski about 600mm fore and 600mm aft of the boot centre and then join the two with a straight line. I've seen this (or rather, the ski) be out by as much as nearly 2mm at the boot centre. And yes, I checked and re-checked my marking out. I mount to this line and not the ski - which is where a jig would put it.
post #11 of 29
Is it just the 181 that is wrong? Tried to phone K2 this morning but the tech guy I was put through to is off
post #12 of 29
Dukes come with a template. Although it wasn't paper, per se (it was more of a sticker).
post #13 of 29
there, fixed it for ya...

Quote:
Originally Posted by Jer View Post
Probably because they don't want to pay $90 to have some 16 year old stoner drop the jig and drill 16 missalligned holes in thier skis. Or drill one ski 2.7 cm back because they neglected to line it up. Or drill clean through. Or mistakenly mount someone's 12 DIN Markers on your Squads. Mounting bindings isn't some weird voodoo rocket science.
post #14 of 29
Quote:
Originally Posted by Johnnie Crystal View Post
I like to mount my own bindings, and recently, I have been planning to mount bindings on a pair of K2 Coomba. By chance, a ski shop tech told me that K2 had revised the mid-sole position for the Coomba. The tech did not make much sense so I called K2 for clarification. Here is the story: early production skis with the mid-sole position marked in white are incorrect by 2cm. Later production skis with the mid-sole position marked with red are OK . Check: tail to mid-sole position should be 79.5cm for the 181 ski. Make sure your ski shop knows the difference. Ski-techs: call K2 for verification 206-805-4800. Incidentally, my Salomon bindings did not come with a mounting template, and I don't have a jig, so I am making my own template with AutoCAD. Johnnie
I have a pair of 188s with the midsole position marked in red, so I think I'm OK, but I plan to call K2 to confirm.

Has anybody actually skied the Coomba yet? Reviews seem to be few and far between.
post #15 of 29
Quote:
Originally Posted by Gauthier View Post
Wouldn't you rather just pay $25 for someone to mount the bindings with a Jig? I could never figure out why people would mount bindings on their own, without a jig.
Every time I took skis to be mount d in DC it was like $50+ for just the mount $75 if you wanted them torqued etc... and you had to give up your boots for however long it took to mount them. So yea I learned to mount my own. Not hard, in fact trivially easy if you have basic tools like a hand drill and a long straight edge.
post #16 of 29
Quote:
Originally Posted by Merlyn View Post
I have a pair of 188s with the midsole position marked in red, so I think I'm OK, but I plan to call K2 to confirm.

Has anybody actually skied the Coomba yet? Reviews seem to be few and far between.
Can you do me a favour and measure the position? Mine are in white, so could be wrong. Thanks
post #17 of 29
Any of the white/silver midsole marks are incorrect. red/blue are ok.

Another thing to note --- do not measure from the dimple in the middle of the tail, your measurement will be off. Measure from the actual tail of the ski.
post #18 of 29
Anyone care to disclose what the actual position should be on the 188? If not I'll try calling K2 again in the morning
post #19 of 29
Quote:
Originally Posted by JimLad View Post
Can you do me a favour and measure the position? Mine are in white, so could be wrong. Thanks
JimLad - Will do. I won't get a chance to do so until tonight, though.

Let us know if you get any info from K2.
post #20 of 29
So I phoned K2 just now, and they have not revised the position. No changes to it.

Leaves me wondering where did you guys hear it was wrong?
post #21 of 29

Expensive Mounting!

Quote:
Originally Posted by Gauthier View Post
Wouldn't you rather just pay $25 for someone to mount the bindings with a Jig? I could never figure out why people would mount bindings on their own, without a jig.
I just called the ski shop to find out how much it will cost me to have my new bindings mounted on my new skis...$75.00!!!! Is that highway robbery or what?? I live in Tucson, Arizona and there is only ONE ski shop...that's probably why!:
post #22 of 29
Any luck Merlyn?
post #23 of 29
OK, I have a 188 Coomba, with the mounting point marked in red. Measuring from the notch in the ski, the mid-sole position is 82.4 cm. If I measure as if there was no notch, I get 82.9 cm. JimLad - what do yours measure?

Next question: what bindings? I have Freeride +'s and STH 16's. Leaning towards the former.
post #24 of 29
Okay using some shady methods (bits of A4 paper and a PS2 memory card!) I think its about 80.5 cm from the centre of the notch to the mark.

K2 sending mixed messages :
post #25 of 29
Quote:
Originally Posted by JimLad View Post
So I phoned K2 just now, and they have not revised the position. No changes to it.

Leaves me wondering where did you guys hear it was wrong?
Maybe you need to try again. Based on the OP, I asked a rather informed K2 rep who confirmed the change to a new recommended point (although I failed to ask about the size of the change).

FWIW - in a Hell Bent mount point discussion over on the K2 boards, someone posted the K2 mounting chart. It shows the following mount points for the Coomba:

167 - 72.5 cm
174 - 76 cm
181 - 79.5 cm
188 - 83 cm

The spec'd 83 on the 188 matches the 82.9 Merlyn got via the "no notch" method pretty precisely. Consistent with what mortimer said...

I don't know how long it'll be up, but here's the URL for the chart: http://i229.photobucket.com/albums/e...mounting-1.jpg
post #26 of 29
Weird, oh well looks like I should get them mounted +2
post #27 of 29
I have PDF templates for Salomon laying around somewhere. I can try to dig them up if it helps anyone. I made them by scanning the bottom of the bindings to get the screw hole positions, then importing into a CAD program and sketching it up. Worked like a charm.
post #28 of 29
K2 emailed me their specsheet (pdf). I would attach it but can't :

So here's a pic:


http://img470.imageshack.us/img470/6...zesheethd4.jpg

Confirmation from them that it should be 83cm from the tail to midsole.
post #29 of 29
Just got my skis back from the shop



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