by 4914 on Fri Sep 20, 2013 11:54 am
11.4 I can perfectly understand that this is hard to believe...and your assumption is that the reason for the product failure is “user error”
I can’t say when your told “it’s your fault the cassette broke” my pride takes a hit and I want to prove otherwise so I’ll keep it simple and give you my evidence that this is a very poor design, make up your own mind.
Your logic is that shimano for whatever reason could not be aware of a product problem like this or accept that this cassette is a rubbish design….
So, therefore it must be a user error.
It’s a cop out to say “user error” because the only thing a user could do to cause this failure is pedal to hard and break the carbon, or not have the correct tension of the lock ring? Assuming greasing of threads, and re-torqueing and all the lah lah…what else could one possibly do to cause this?
And even if it didn’t break, who in the last 20 years has ever had a creaking cassette that required re-torqueing to keep it quite… as its absolutely clear that loads of people have this problem at the very least?
Facts
1. I have spoken to Henry Bosch at shimano Europe head office in the Netherlands, after calling to report a dangerous product they put me on to him. I talked with him at reasonable length and described and explained the problem that I had and asked they were aware of this problem. He said the have at some come back but were not inundated, and most importantly that there was an issue with the rivets in the past…. quite evasive but honest .
2. I have picture to demonstrate the failure of three cassettes all with a couple of days use, interestingly it appears that breakage is around the rivets… wow
3. The LBS installed all of the cassettes and you’d expect for it to be done properly, but as many would agree.. It not have been. Besides that, I have 25 years working on bikes and personally checked and re-torqued the cassette to the correct t “middle of the road” tension of 40nm, and of course I checked to see the manufactures instruction before I ramped it up to 50 for the last cassette. So we can pretty much throw the correct tension debate in the bin.
4. That leaves me putting so much power the cassette creaks and fails, please… I’ve put more than double the power into previous durance cassettes and they didn’t break, or crackle & pop. I bet there is nobody out there to report the same failure on any of the older dura ace cassettes?
So you have my evidence this is a rubbish design.
I still love the dura ace range and will continue to use it…. But if you were me, what you do?