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Boot flex effect on performance

post #1 of 13
Thread Starter 
5'10, 180lbs, level 7/8

How much of a difference does it make going from a 90 flex boot to a 130 for an average sized person?

On which applications do you see the biggest difference?
post #2 of 13
Depends on the ski! If you are going to a 130 flex I would expect that you would have a ski that requires that kind of power or you are just getting banged around for nothin! I can't stop skiing gates so I still force my myself to bang around the entire mountain all day.
post #3 of 13
flex difference in the same line eg:comparing a lange to a lange or different lines lange to nordica?
post #4 of 13
Thread Starter 
I understand that flex ratings differ between boots...so lets assume Nordica to Nordica or Like to Like.

I just bought AB's from SJ in 178, so thought a stiff boot would be a good idea.
post #5 of 13
I wouldn't be sweating it too much either way. The AB is not an especially stiff ski.
post #6 of 13
like all your equiptment, the characteristics of the gear correspond to aspects of technique, and a skier's strength. 130 flex would give power to a skier who knows how to use power. everything is more critical on firm snow.
post #7 of 13
I'm 5'10" 185-190 I ski a 90 flex boot. I'm very aggressive. I ski mostly zipper line moguls, park and off piste jumps cliffs etc.. The 90 flex has made a big improvement in my skiing and staying flexed. I was previously in a 110 flex. The only time I wish I had a stiffer boot is when I'm blasting crud. But the trade off is more than worth it for me.
If I went to a much stiffer boot my mogul form would suffer and I wouldn't be able to ski as many hours during the day.
Super stiff boots are way over rated. I can still carve rails with my 90 flex. If I can find a boot that fits me as well in a 90-100 adjustable flex it'd be perfect for me.

Why go to a 130?
post #8 of 13
Quote:
Originally Posted by ski=free View Post
I'm 5'10" 185-190 I ski a 90 flex boot. I'm very aggressive. I ski mostly zipper line moguls, park and off piste jumps cliffs etc.. The 90 flex has made a big improvement in my skiing and staying flexed. I was previously in a 110 flex. The only time I wish I had a stiffer boot is when I'm blasting crud. But the trade off is more than worth it for me.
If I went to a much stiffer boot my mogul form would suffer and I wouldn't be able to ski as many hours during the day.
Super stiff boots are way over rated. I can still carve rails with my 90 flex. If I can find a boot that fits me as well in a 90-100 adjustable flex it'd be perfect for me.

Why go to a 130?
I agree with you. Im 6ft 190lbs and I only ski my 110 flex technicas for 8 hours of straight skiing with no problems. Some boots like my technica have a stiff - flex knob in the back that allows you some extra flex when you need it. I ride it at stiff and charge just about everything. I bust jumps, bumps, downhills, pow you name it 110 is just right for everything as far as for me. 130 flex is really stiff. It would probably make a good matchup with some race gs skis. 90 to 110 is perfect all around range.
post #9 of 13
How stiff you like your boots depends a lot on where you ski.
If you ski off-piste, moguls, powder, a boot that is less stiff is usually better.
post #10 of 13
Look for a boot that's adequately stiff for you. Just as too soft is too soft; Mo stiff isn't always mo better.

I ski Volkl Explosiv's, Legend Pro's, and other fairly stiff skis with Salomon Falcon Guns (+ intuition liners) and Nordica Hotrods.
I like the Falcon Guns more, which are comparatively softer than the Hotrods because they let me work the terrain. I'm 165 and the hotrods are great for race skis on smooth snow, but because they are stiffer its harder for me to adapt to terrain.
post #11 of 13
Quote:
Originally Posted by ski=free View Post
I'm 5'10" 185-190 I ski a 90 flex boot. I'm very aggressive. I ski mostly zipper line moguls, park and off piste jumps cliffs etc.. The 90 flex has made a big improvement in my skiing and staying flexed. I was previously in a 110 flex. The only time I wish I had a stiffer boot is when I'm blasting crud. But the trade off is more than worth it for me.
If I went to a much stiffer boot my mogul form would suffer and I wouldn't be able to ski as many hours during the day.
Super stiff boots are way over rated. I can still carve rails with my 90 flex. If I can find a boot that fits me as well in a 90-100 adjustable flex it'd be perfect for me.

Why go to a 130?
I had a similar revelation this season.

I'm 5'9, 165 lbs. I've been skiing Lange 120 flex boots for years.

This year I got a Falcon CS Pro which is rated at 110 -yes, I know flex ratings across boot lines don't correlate. still, it's a point of reference.

On my bootfitters suggestion I removed the two bolts on the back of the boot which allegedly diminishes the flex from 110 to 90. The difference is not great, but I prefer the 90 flex. The boot is more forgiving in bumps and powder and the only time I miss the stiffer boot is ripping off high energy turns on groomed terrain which isn't my typical terrain.

My thought is that a super stiff boot isn't needed by most people on "shaped skis" because we no longer need to drive the ski as much from the tip and instead roll from the ankles, knees & hips.
post #12 of 13
Thread Starter 
Quote:
Originally Posted by Snoweater View Post
Depends on the ski! If you are going to a 130 flex I would expect that you would have a ski that requires that kind of power or you are just getting banged around for nothin!
Since boots, bindings and skis work as a system instead of individual units...Would a stiffer boot allow you to ski a longer ski length (say 178 vs. 170 of the same model)?

That seems like a good way to manage a longer ski and take advantage of greater stability, crud busting and float in softer snow...or am i off my rocker?
post #13 of 13
Ankle flexibility has some relationship to what works in boots for individual skiers. I find that people with limited dorsiflexion (10 percent or less) or excessive dorsiflexion (25 percent or more) can benefit from the additional control that a stiff boot provides. If you have a normal range of dorsiflexion (15 - 20 percent) lots of different flexes will work.
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