It is a 1/3. You always quote base bevel first. This is a 1 degree base edge bevel and a 3 degree side edge bevel. I have the Mojo 94, same ski as your John.
Yep, you definetly want a 1/3. Just ask at the shop for a it just like that.
A 1 degree base bevel is defined as follows: If you put a truebar flat on the base of the ski (base facing upward) and match the downward angle of the steel edge only; to = a 1 degree you should have a gap between the truebar and the base of 1mm at the measurement of 60 mm across the ski.
If your gap is 2mm you have a 2 degree. (Unacceptabe!) If your gap is .5mm that is a 1/2 degree. .5 and .75 are used by some freeskiers but mostly racers for Slalom and GS.
For an all mountain and off piste biased ski like the John a 1 degree base bevel is desireable. A true 1 degree is very versatile and only requires a moderate amount of tipping the ski to engage the edge.
A 1 degree base bevel is the standard amount of base edge bevel that many skis come directly form the factory with. Any more then this makes a ski very loose feeling and requires a lot of tipping to get the edges to engage.
Now side edge.
The more side edge bevel you have the more edge grip is created once the edge is engaged. You set both the base and side edge with different tools designed for the job called bevel guides.
Some companies call their 3 degree side edge tool a 3 Degree and some would call it a 93. In any event, you want to create an acute angle when compared to a 90 degree angle or a 0/0. (flat base edge and flat side edge)Your side edge, when the ski is postioned base down would angle away from the side wall of the ski. So rather then your edge being a 90 degree angle a 1/3 ends up being 92. or a 3 degree side edge and a 1 degree base edge to create an acute angle.
if you do a search on Base bevel and check out the Wikis, Alpinord has done some excellent diagrams to illustrate all of this.
I have 4 pair of Head Mojo's and Monsters and so do some of my friends. They all came from the factory with way too much base edge bevel and way too little side edge bevel.
changing to a 1/3 transformed the 94's into a very versatile and useable ski on hard pack and powder. The 3 degree side edge has no negative impact in soft snow butincreases the skis edge hold on hard snow and ice dramatically.
Originally Posted by woodbury
I just bought a pair of 2010 Head Johns, and I was reading about something called "3/1" tuning or something along those lines. Can someone explain this to me? I'm relatively new to the sport of skiing and this makes no sense to me.. also, if anyone has any recommendations of a) how to get these skis setup and b) how to ask for it at a shop, that would be great.
Edited by Atomicman - 6/15/11 at 2:54pm