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Base grind or not?

 Poster: A snowHead
Poster: A snowHead
At what point do you normally get your skis base ground?



There is a slight concave to my bases as pictured above.
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 Obviously A snowHead isn't a real person
Obviously A snowHead isn't a real person
grind 'em

If they are not flat it doesn't help your skiing.
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 Well, the person's real but it's just a made up name, see?
Well, the person's real but it's just a made up name, see?
Not that much choice if you want to correct geometry.

I haven't had any concave problems with family ski stock, but do "flat" bases by hand in servicing them routinely. None have needed grinding, yet.
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@tomb, as I understand it a concave base, if bad enough, will make the ski "track straight" i.e., become more difficult for you turn.

If it's slight and you don't feel a difference you can leave it.

I seen on another thread where an experienced poster said "I have a number of ‘very not flat’ skis some convex some concave - action: most of them ski fine, and I am not inclined to have them ground flat."

Maybe a good repair shop will advise also.
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 Anyway, snowHeads is much more fun if you do.
Anyway, snowHeads is much more fun if you do.
Annoyingly these skis have seen about 3 weeks use, is this expected?
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I can't get your image to load I'm afraid @tomb, so it's hard to be too definitive. But as @davidof, @Layne, @ski3, all suggest, in general it would make the skis tend to rail and be 'catchy' and therefore unsettling to ski. Quite a few ski techs I know have told me that a tiny bit concave tip and tail is not normally a worry, but in the area underfoot it should be addressed.

If they are concave, it's unlikely this has arisen though use. The normal pattern of wear from use would be for the base to become slightly convex, more so underfoot. So I don't think the 3 weeks of use is especially relevant.

I think it's more likely that as the various glues and resins holding the layers of the ski together continue to cure, this pulls it slightly out of shape. Another possibility is poor storage conditions either prior to sale or during your own ownership. Whatever, it's really not at all uncommon and some ski shops, when selling you skis, will offer a first free service and base grind as part of the deal which can be a nice assurance.

Hoping that @spyderjon will spot the thread and make a contribution too ...
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 Then you can post your own questions or snow reports...
Then you can post your own questions or snow reports...
tomb wrote:
Annoyingly these skis have seen about 3 weeks use, is this expected?


There's always potential in a structure like this to move slightly.

Through the layers within exist competing forces to drive the characteristics in ski performance, all bonded together in making those tensions able to enact that particular traight when used.

Such different materials can certainly change in dimension slightly over time, temperature change, etc etc. Bonded together though, the only way out for lateral shift is to curl when "tethered" to it's neighbour in structural makeup.

They are pretty stable generally, but it surprises me that they are generally so consistent in reality.

A light grind to correct the error may then see no further changes over future use. A sympathetic ski tech view will likely get them back to a normal stance with no real risk.
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