Originally Posted by
AlexCyclistRoch
FWIW, you really need a dedicated 8mm hex tool on a 3/8" ratchet wrench to get these off. I found out the hard way that my Harbor Freight 8mm ball end t-handle was not up to the job.
An extra-long hex key can do the trick, but a 8mm hex socket is preferable. Those bolts get ~30 ft. lbs. so you need more than a few inches of leverage if you expect to loosen them.