In reply to Tricadam:
They don't actually come with crampons, you have to buy them separately anyway, they are not too bad price wise compared to some, Facewest are knocking them out at £49 at the mo....
Also you might get away with the 90mm, it depends on the width of the ski more than the width of the brake, best to go as narrow as possible with them really.
Post edited at 13:17