FKS 140 heel piece question

Most likely not a full shell size unless they are almost at max or min for the forward pressure when originally mounted. You can explain to a shop tech that you're looking to be able to adjust this as much as possible (make sure you state which way you want to go) and they should be able to mount it so that you can get the most adjustment out of it. The amount of adjustment is 20mm, which means if it's at min it'll go 20mm till max (this isn't much at all), most of the time a shop will mount a binding so it's in the middle of the forward pressure range, this way they have some room to work with either way for minor adjustments after mounting.

cool, thanks for the reply and info.

So intheory if I mounted them say 5mm short of maximum extension, and then dropped a shell size (10mm?), technically I should have room to adjust for this size difference.

I don't think i'd risk doing that, but in theory I assume that would work.

I mean yea in theory I guess but your forward pressure will be off. Bindings that aren't on a track aren't going to move that much. My guess is you can get away with 2 or 3 mm, but anything greater than that I don't think so.

Current boots are 318mm bsl, new i'm debating buying are 305mm.

Looks like I won't be able to mount to accomodate both of these boots huh

the 20mm is the entire range of adjustment, and if the shop knows what they're doing when mounting then it should be adjusted to the middle of the range, meaning they should be able to go forward or back around 10mm. I have also read in a lot of places on TGR and just from working in a shop that it is more like 15mm total, meaning about 7.5mm from the middle either forward or back. I would not attempt to try and make a 305mm bsl fit in an fks mounted for a 318mm because it'd be a waste of time. It really is the only drawback, in my opinion, to the fks/pivot binding. I can't make my old boots fit (when I sell my full tilts every season and wait for new ones to come in) into any of my current skis, and it's a shame but worth it in the end using such a bomber binding.

It's 15mm total from the minimum recommended line to the maximum recommended line. You can adjust them outwith this but surely the lines are there for a reason. I don't know who is saying 20mm now, but the heel units are the same as the old ones so I call BS on that.

If you're sure you're going to change shell sizes then mounting for a length exactly between them would let you adjust each way and work out fine. Remember that you need to set the jig about 5mm shorter than your boot's sole length for a normal mount to work out exactly in the middle of the range, so find an experienced shop or do a test mount yourself. Older paper templates didn't account for this fact, but I think newer ones do, so practise first for sure if you're using one.

Thanks a lot for the help with this.
Maybe a dumb question, plus it's late and been a long day, but can you explain why the jig needs to 5mm shorter than the bsl? Is that regardless of where the adjusters are set for the forward pressure before mounting? I'm sitting here trying to figure it out.

I would not worry about what boax said above. I have mounted plently of FKS, and if you mount with the jig, you can get a perfect mount by setting it as it should be. I imagine what he was referring to is if you were trying to mount so that both BSL's would fit.

Just looked at your profile and saw your at tamworth. Your best bet may be to go into the brighams there and ask about getting your skis, boots and bindings transferred to castleford for Julian to mount for you. He is the best tech in the Uk by far. If you can defiantly get him to fit your boots too.

Maybe the new jigs are different, but on the old ones (pre-2009) if you just used the jig as normal you would always have to adjust the heel shorter after mounting. So practise first to be sure.