Originally Posted by
Chris0381
Can I ask how the cassette is being used?
Its not a performance cassette and you cant just shift and forget. I havea PG-850 and you have to be careful shifting these things especially when the chain is under tension up hill. There are times I'll have to jump off the bike and walk up a trail hill rather than forcing it into a granny gear and stressing it.
You have to use consientious shifting with these cassettes as they don't seem to be able to take the stresses of rough shifting techniques.
Keeping the gear train clean and well lubed is another thing that could help.
The SRAM cassettes I have are not too forgiving for rough shifting and am always thinking of ways to relieve the stress of the drive train in my rides.
I think that pic by Chelboed shows a hub under immense standstill torque were one would be on a steep hill practically motionless while torqing the crank with some strong legs might I say. Maybe over and over causing fatique failure.
Or the cassette fit on loosely (poor tolerances of hub or cassette) causing a lot of movement between hub and cassette matting.
Or a hub whose metal was too soft.
Actually, no cassette should be subjected to "rough shifting techniques" as you put it. If you wanna downshift going uphill, pedal hard and give the bike a good "surge" forward...then soft pedal or basically just keep the cranks spinning enough to shift. As soon as you drop into gear, put the power back down.
This whole "shifting while applying alot of torque" crap is just asking for a broken chain.
As stated in another thread: Hope offers a stainless steel freehub body to replace the aluminum one. If I could do that or just use a carrier type cassette. (XT, XTR, PG980, PG990)