Thanks. ^^ You too.
Those stock are great for what they are (80/20 pavement/offroad i believe), long lasting, can lean at higher speed on pavement corners like crazy while still stickin' good on gravel wet or dry, however when it gets too soft like moderate sand or mud, wet grass... The front tire is unpredictable, They dont favors confidence too much, ive badly damaged my risers once from a little slip, turned out to drop twice as hard because ive actually stopped the fall with my foot, the bike yeeted away... Buut its quite easy to powerslide with those, thats a plus for me. :P

Ah and its a shame for what happened to your 640. :/
Hopefully you were ok afterward.