View source for XT 775 Freehub Failure

==What Happened?==
Just at the end of a hike-a-bike section we were pushing up on our weekly Tuesday Night Ride a short pedal section put me back on the saddle. KLUNK, PING! WTF?

Push the bike the rest of the way to the top of the trail where it comes out to fire road to check out the problem. The freehub was frozen solid! Basically, the bike was now a fixed gear. Nothing we did could free it up. Since any coasting would destroy a bunch of drivetrain parts, I had to break a brand new Dura-ace 10spd chain and coast the bike off the mountain while the group went up and had a great night ride without me. I drank one of my MGD 20's and scootered myself out for the next 20 minutes.

==Freehub Failure==
Forensic investigation showed that all 4 palls shattered and jammed the mechanism. Never seen this on a ride personally. Usually freehubs fail by skipping rather than seizing.

[[Image:XT775-Cassette-Failure-7.jpg]]<br><br>

==Dissasembly==
Many people have never taken a freewheel or freehub apart. Here are some pics. Note that the new style shimano freehubs require a 14mm allen to remove. Buy one today if you don't have one.

[[Image:XT775-Cassette-Failure-1.jpg]]<br><br>
[[Image:XT775-Cassette-Failure-2.jpg]]<br><br>
[[Image:XT775-Cassette-Failure-3.jpg]]<br><br>
[[Image:XT775-Cassette-Failure-4.jpg]]<br><br>
[[Image:XT775-Cassette-Failure-5.jpg]]<br><br>
[[Image:XT775-Cassette-Failure-6.jpg]]<br><br>
[[Image:XT775-Cassette-Failure-7.jpg]]<br><br>
[[Image:XT775-Cassette-Failure-8.jpg]]<br><br>
[[Image:XT775-Cassette-Failure-9.jpg]]<br><br>
[[Image:XT775-Cassette-Failure-10.jpg]]<br><br>

[[category:Bicycle]]
[[category:Drivetrain (Bicycle)]]
[[category:Failures (Bicycle)]]