I'd say there are differences.
Since sliding rails is more than just sliding on a metal object, these are some things that have and have not come into this topic:
- Swing Weight: If you want to spin on or off of a rail, you don't want to be riding a beasty ski, you want something light that you can forget about when you spin.
- Recommended mounting position: Sure some people just have them mounted wherever they want, but it's recommended for that position because of strength issues etc. So people want to know if it's fairly centered for easy balance on the rails.
- Edge thickness, the thinner the edge, the less surface friction to change the way you slide, the thicker the edge, the more surface friction, the stronger edge? Companies don't normally tell people how their slide will be affected by a certain edge thickness, think of it... if you have thick edges there's going to be more friction slowing you down so you'll have to hit the rails faster to keep up your speed if it's a long rail.
- Base Material: Some bases will obviously slide faster than others, people might want to know this.
So yeah, it does matter. Some skis are good on rails (1260), and others aren't (big fat heavy skis) etc.
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