At last! This weekend I could ride the ST with the 21 " front wheel.
It has become a fat enduro!!
If you like to do off road with this bike definitely worth making the investment, it's great!
By road the direction feels lighter, with less aplomb especially at high speed or high speed corners. In slow corners I almost like it better than the 19”.
In off road the change is incredible, the bike swallows all the bumps and in technical rides the improve is great.
Best of all is that between the increased diameter of the wheel and the rear suspension I have increased 3cm the ground clearance.
Now I can do trial with it!