there seems to quite a few rim cracks being reported, especially on the 390. Some pages back, it was discussed that incorrect tyre pressure could be one of the probable reason for rims cracking, as the rims were tested and certified ok under their typical testing procedures.
Was curious to know a bit more in detail about your incident. What king of terrain were you on? how big was the stone? was it a head-on impact? what speed roughly were you doing? when had you last checked the tyre pressure and any indicative idea about the tyre pressure during the time of impact? did you get time to slam the brakes? what happened immediately after the impact, as in how did the bike behave? the most bewildering is if the impact was on the front wheel, why did the rear too crack? sorry for so many questions, and sure answers to these would be helpful to all here.



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