Due to the high ethanol content in fuel nowadays it is not kind to seals, especially on bikes that do not get used all the time. leaving bikes standing is far worse for the seals than using the bike everyday. this leads to the crank seals degrading rapidly. Which is not what you want on your pride and joy that has just been fully rebuild.
Our labyrinth seal design completely removes this worry by removing all of the rubber elements within the crank.they simply fit in place of your original seals