Fischer RC4 Pro MV vs. LV.

[Evil E]

Couldnt find the LV to try on and pulled the trigger on an MV but I think its also a bit wide and too much room in the instep height. Coming from a Krypton and Im surprised of how much room there is in the toebox and the instep height. I never thought Id need an LV, but perhaps I do. There may be a brand new MV DYN PRO BOA 27.5 popping up in the Gear swap if I cant dial it in.

[Evil E]

I did not try a 26 shell, but I really do not have any desire to either. Ive been in a race fit 27 forever and my feet arent getting any smaller.

[DarthMarkus]

I'll jot down a few notes after skiing the RC4 Pro LV last year, since there's some activity in this thread again.

I'm pretty positive the MV would have been to large, particularly around my heel. I came out of the mach1 LV, and I think there's still an argument that the Mach1 had slightly better heel retention, though at the cost of needing a lot of work around my haglunds deformity.

The forward lean is aggressive. I dialed it back as much as I could and it's still a lot for some of my skis. Notably, I skied the mana 3 a lot, and the RC4 is too aggressive for that ski IMO. It did well in the mpro 108 and Rossi black ops 98. I also ski with minimal delta on my bindings - pivot 14s/18s w/CAST.

Work on your zipfits. Anyone who's had them before could probably tell you, and they did tell me, that you need to spend some time dialing in the cork. I gave way more days than I should have expecting some give around my navicular. Finally ended up heating and massaging it out myself - exponentially better.

My 6th toes make my left foot around 103mm and 104mm on the right. But outside of being directly on the 6th toe, I'd be around a 98mm foot @ 26.5. I definitely needed punches on both feet. So don't waltz into this boot expecting minimal work if you have even the slightest deformities on width. Probably go with the MV if you want that.

I had to buy cuff alignments aftermarket, and only received them after getting injured last year. So I still haven't skied in the boots with properly aligned cuffs. Jury is out whether that contributed to my injuries.



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[Evil E]

I'll jot down a few notes after skiing the RC4 Pro LV last year, since there's some activity in this thread again.

I'm pretty positive the MV would have been to large, particularly around my heel. I came out of the mach1 LV, and I think there's still aN argument that the Mach1 had slightly better hero retention, though at the cost of needing a lot of work around my haglunds deformity.

The forward lean is aggressive. I dialed it back as much as I could and it's still a lot for some of my skis. Notably, I skied the mana 3 a lot, and the RC4 is too aggressive for that ski IMO. It did well in the mpro 108 and Rossi black ops 98. I also ski with minimal delta on my bindings - pivot 14s/18s w/CAST.

Work on your zipfits. Anyone who's had them before could probably tell you, and they did tell me, than you need to spend some time dialing in the cork. I gave way more days than I should have expecting some give around my navicular. Finally ended up getting and massaging it out myself - exponentially better.

My 6th toes make my left foot around 103mm and 104mm on the right. But outside of being directly on the 6th toe, I'd be around a 98mm foot @ 26.6. I definitely needed punches on both feet. So don't waltz into this boot expecting minimal work if you have even the slightest deformities on width. Probably go with the MV if you want that.

I had to buy cuff alignments aftermarket, and only received them after getting injured last year. So I still haven't skied in the boots with properly aligned cuffs. Jury is out whether that contributed to my injuries.



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Interesting. Maybe I have haglunds too, ( I always thought it was just a heel spur ?) my right heel went numb just sitting on my couch while wearing the boots but I think the lower shell is too wide at 100. I thought the boa would perhaps compress the lower shell enough to work but there’s too much room and I’m getting hot spots from dialing it too tight. I have the boa rc4 dyn zip fit fyi


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[Qilimanjaro]

funny enough, I've since sold these and I'm moving to a shadow LV 130 + zipfit setup. the stiffness of the RC4 pro simply made it too niche of a boot for me. Really beat me up in chop where I'm after a better suspension.

Contemplating getting the LVs, but this is what's stopping me. Can anyone else concur? Too stiff in chop is a thing even with Zips?

Also, would Pebax cuff interfere with the vacuum process? That's another potential upside for me, I'd much rather vacuum them

[banzai]

The Fischer RC4 PRO MV DYN BOA Last One Out Please Turn Off The Lights certainly has my interest. Never set my flat foot in a Fischer. Can it replace a RS 130? Ideally I would like my RS130s to have toe pin inserts and that would be perfect.

[auvgeek]

It seems odd to me that they only offer the DYN or BOA in the MV last. Would be nice if they at least added the option for BOA to the RC4 Pro LV for 2025.

[auvgeek]

Agreed dude, then I wouldn't be in a 26 for the first time since I was ten Turns out some companies don't care about the 5 shells they'd sell on here. Fuckers.

Seems like they would sell more of the LV BOA than the MV DYN, to be honest. And I can see keeping a buckle version of the LV for the purists who don't trust the BOA.

I actually don't see a huge use case for tech inserts in an overlap race boot without a walk mode. But maybe there's enough people out there who want a boot that they can *technically* skin in the Shifts/Duke PT/CAST binding that Fischer will actually sell the DYN.

[banzai]

Edit to add: K2 Cortex could be a good option for ya as well...perhaps check out the K2 Recon thread as the K2 rep, Tom has posted some info.

Thanks for the heads up. Sure sounds like it ticks the boxes. This got me thinking, how long before Lange come out with a pinned RX boot.

[kanangra]

Just had some Pro LVs fitted, and wanted to give some more data markers for people figuring out fit and sizing. My previous boot was a 26.5 original Tecnica Mach1 LV, which needed punching at the sixth toe and was always a very firm fit with just enough length - I really could have used another couple of mm. My foot is 263mm, 98 wide excluding the sixth toe and 102 including. Normal arch, narrowish ankle, a slight haglunds and a medium high instep.

My RCs are 26.5 and fitted pretty much out of the box. Length is really good, my sixth toe just presses the sides, and the instep is firm but not pressured. The roomy toe box - including the fluffy wool - is a revelation.

A couple of points:
1. I'm not sure how cuff adjustment works....there is a cross-shaped pivot 'washer' that looks like it could rotate but it would involve filing away plastic, and it's not clear whether it would then stay in place. Perhaps there is no cuff adjustment, but my stance is straight enough to not worry about it. Maybe the non-adjustability is what Somatec is.....?

2. Fischer are all over the place as to whether this boot can be vacuum molded. Their website says yes, for the same product number as mine (UO5023) but the actual boot is printed with "Thermoshape" meaning no vacuum needed / possible. Perhaps mine is a 24/25 model, but the product number is the same..... I've emailed Fischer to ask what's going on.


So far I've had the inners heated and done a heap of carpet testing but no skiing yet. No shell punching needed, although I might revisit the sixth toe fit in one boot. Flex-wise they are about the same as my Tecnica 130's but somehow have a nicer pattern to the limited flex there is, and there is no deformation. They are set to 17º forward lean at the moment and it feels OK. The tape inside the spine is already peeling as @Sylvan noted. I have Intuition Pro Tour HV inners in my Zero G Pro Tour boots and tried them in the Fischer shell - results in a more comfortable setup but that's understandable as they have lots more material in them, and were fitted by the masters at Sole Chamonix. I expect it will be a comfort / performance tradeoff. Will wait for the ZipFits to settle in but I'm a fan.

I previously tried the MV DYN BOA in 26.5 and my foot swam a bit in it, and there was significant shell deformation around the instep when flexing. It didn't feel like a 140 boot either. I also tried the LV 120 in 26.5, and my toes were hitting the front, although only just. So to find the Pro LV to have good length and width was a nice surprise, as I had to have them shipped across the world - the distributor in Australia doesn't carry this boot.

[banzai]

@Sylvan, whats lengths are you feet?
Fischer has this new Volumental fit solution (possibly new, I remember playing with another app a few years ago). Easy to use and nice that its not an actual app, but browser based. Anyway, it measures my feet at 267 mm length / 104 mm width / 63 mm height and suggests 27.5. Both my Langes are 26.5 LV for reference.
Click on "Get your best fit" https://www.fischersports.com/rc4-pro-mv-dyn-boa/U06024

[kanangra]

Volumental said 27.5 for me, which would have been quite wrong

[banzai]

Indeed very helpful, thanks guys.

[Jean Poudreuse]

How does the LV fit compared to an ultra or club sport?

[jason.havlicek@gmail.com]

Are Fischer boots still produced with an abducted stance?

[DarthMarkus]

Are Fischer boots still produced with an abducted stance?

Just had some Pro LVs fitted, and wanted to give some more data markers for people figuring out fit and sizing. My previous boot was a 26.5 original Tecnica Mach1 LV, which needed punching at the sixth toe and was always a very firm fit with just enough length - I really could have used another couple of mm. My foot is 263mm, 98 wide excluding the sixth toe and 102 including. Normal arch, narrowish ankle, a slight haglunds and a medium high instep.

My RCs are 26.5 and fitted pretty much out of the box. Length is really good, my sixth toe just presses the sides, and the instep is firm but not pressured. The roomy toe box - including the fluffy wool - is a revelation.

A couple of points:
1. I'm not sure how cuff adjustment works....there is a cross-shaped pivot 'washer' that looks like it could rotate but it would involve filing away plastic, and it's not clear whether it would then stay in place. Perhaps there is no cuff adjustment, but my stance is straight enough to not worry about it. Maybe the non-adjustability is what Somatec is.....?.

The 'washer' can be fitted with a different one, but it needs to be ordered from Fischer. Depending on how you rotate it, it will orient the cuffs inward or outward. For me, the boot DOES feel abducted, hence the new cuff alignment pieces. Unfortunately I got injured before I could install them and use them last year.

As for heat molding, the shells should work since it's made with TPU. I won't do it unless I can get them into a Vac machine though, and nobody in my state seems to have the machine anymore.

@kanangra - your foot is very similar to mine. Don't be surprised if you need to move cork out of the tongue across your instep. I needed to do a light grind on the haglund's area too. Same as I did in my own mach 1 LVs.

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[banzai]

Interesting discussion involving the length fit of the RC4, among other things. Slight inconsistency on the heat moldable shell, corrected in the first comment below the video.

[auditor&shredder]

How did you align the cuffs...in or out? Some have said this boot feels biased towards the inside edge which I agree with. Not sure if it's canting or cuff alignment causing it.

Besides that I can confirm everything else in your review!

[El Chupacabra]

Bump of what seems like the most relevant thread -

Anyone have a comparison of the LV boot to other boot brands, in terms of shape and fit? Especially Atomic Hawx Ultra - - if I could find a boot that basically fit like that, but better flex pattern (not "stiff to a point, then fold in half").

[DarthMarkus]

How did you align the cuffs...in or out? Some have said this boot feels biased towards the inside edge which I agree with. Not sure if it's canting or cuff alignment causing it.

Besides that I can confirm everything else in your review!

After recently changing the cuff alignments, I can definitely confirm that it made a big difference to me. Skis feel like they're flat while in neutral position - previously they were favoring the inside edge.

Bump of what seems like the most relevant thread -

Anyone have a comparison of the LV boot to other boot brands, in terms of shape and fit? Especially Atomic Hawx Ultra - - if I could find a boot that basically fit like that, but better flex pattern (not "stiff to a point, then fold in half").

I can't compare it to the Hawx ultra, but I can to the Mach 1 130 LV. The Mach 1 felt a little tighter in the ball portion of the heel, where the LV feels tighter more uniformly through the Achilles and heel. Flex feels similar in flex progression to the Mach 1, but the Pro LV is certainly stiffer overall; I actually prefer skiing moguls less in the Pro LV than the Mach 1. I'd also argue that its torsional stability is greater than the Mach 1 - and that's saying something; small movements in the tibia and ankle translate into the ski more. The width of the Pro LV is also wider near the 5th proximal metatarsal. i.e 5th metatarsal tuberosity. I still needed 6th toe punches on the Pro LV, but for the Mach 1 I needed punches on the 1st phalange/metatarsal joint as well.

A few criticisms I feel better about now regarding the Pro LV would include the initial cuff alignment. I'm a bit annoyed at not having the initial cuff alignment pieces, especially considering its initial abducted stance. I ended up going a full degree difference in the little washer (the red one included in the pictures below, though it's worth noting that I'm bow legged. The GripWalk(TM) soles are also not as intuitive as I expected. I initially changed them out for normal soles, but kept the heels in for a little added grip while apre skiing. Turns out, the GripWalk heels are larger than the traditional ones, which meant I was pitching forward with the traditional toe and GripWalk heel - but that issue may just be user error and not being up to date on current boot norms.

Being pitched forward along with a significant amount of initial forward lean is more of a personal preference. The shim behind the calf coupled with a 17? initial forward lean is VERY aggressive for me. I ended up pulling the shim and changing to 14?. That coupled with a slight change in binding delta from the STH > pivots put me in a happy place though. Before those changes I wasn't skiing as well on more "upright" skis. Namely the Faction mana 3 and mfree 108. I actually preferred the mpro 108 because the forward lean of my boots was more in line with that ski.

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[El Chupacabra]

^^^ Thanks for the detailed feedback. I need to find some of these Fischers in a store to check out.

[El Chupacabra]

Update in case anyone else is seeking these out: i checked out some 27.5 Fischer RC4 Pro LV zipfit boots. Compared to the Tecnica Mach 1 LV 130, the Fischer is not as anatomically shaped for my foot: the heel is looser, it's tighter sideways across the midfoot, and has a higher instep. With a lot of work, I could ski the Fischer - but - it's seriously stiff. That carbon cuff is really burly. This boot may be stiffer than any other 130 consumer boot.

I'm guessing that the MV Fischer RC4 Pro with the BOA lower may fit better in width, but I assume the MV will be even higher in the instep than the LV, so that's not going to work for me.

FWIW, I also ordered (and am returning to the local store) some NOS Salomon S/Max Race 130, which are a non starter for me. BSL of 304, so roughly 10-12 mm shorter than usual 27.5 boots. Nice low instep. Shell fit is OK, other than a shallow heel pocket. The liner is lace up, thin, and feels incredibly undersized in width - like a full size or two too small.

[GoldenBC]

Just so everyone knows, there are four fits when considering the rc4. The Pro’s, mv and lv, are both a mm narrower than their Free version. Basically, it’s the same last but PU vs vacuum fit plastic. The PU shrinks more when it cools.

So:
Rc4 LV carbon pro = 97mm
Rc4 LV free = 98mm
Rc4 MV Carbon Pro = 99mm
Rc4 MV free = 100m

From my experience the MV free has a massive ankle and is a bit of a boat. The Pro is a much better fit for your average mv foot.

[El Chupacabra]

Thanks for the clarification - the ones I tried were the RC4 Pro LV Carbón with the zipfit liner, so my comments above are about those.