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Munrobiker thanks very much!!!! i was looking last night but didnt find that site. You are a better 'googler' than i am !
[i]regards to cleaning, yes the cassette is dirty but the bike had just had a good clean/inspection ready for the dyfi - there was nothing to suggest that the hanger would snap at such a low low speed.[/i]
Doesn't look clean to me.
Hope you get it sorted though.
Everyone knows hanger breakage is proportional to speed.
Have crc got up off the floor and replied yet ?
eh, off the floor?
no
i wouldnt fancy it staying in place if the hanger broke down a fast rocky descent
Typically you're not in the big sprocket on fast rocky descents, which means the mech is a long way from the spokes and extremely unlikely to catch in them (unless the hanger's already very bent, and if it was that bent the completely rubbish shifting would be something of a giveaway that something was up). It's most likely to happen when going slowly and/or uphill, the wheel wouldn't go anywhere. But again, something has to be wrong first (slightly bent/twisted hanger, maladjusted limit screw, bent mech cage) to the cage to catch the spokes.
My old Kona's (two - Dawg and Caldera) had a design where a broken hanger removed half the drive-side drop out. I always thought it was a crap design. Just make sure you have a spare hanger.