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Originally Posted by chelboed
(Post 5534961)
Cheap cassette=carnage
Some picture * ie. cheap. Have any of you ever contemplated that the wonky cassettes used by the OP may have been cheap knock offs and that Jenson's purchasing department may have been duped as well? Sram makes quality products and stands by them... you also get what you pay for (caveat emptor?). If you only drop 20 dollars on a cassette and it only weighs 300g on a scale... there were sacrifices made somewhere. One last thing in regards to the broken cogs on the Ti XTR cassettes: Titanium is a horrible metal when it comes to durability in dusty environments. Titanium by it's very nature is porous, like a sponge, but on a microscopic level. That's what makes it so light. Those pores hold onto dirt and cause the titanium to wear faster. The titanium XTR cassettes were designed to be changed multiple times in a season. I suppose Shimano could chrome plate the cogs... but that does away with the weight savings. |
ACHC, try stating your opinions as opinions, not facts. You won't get to many people angry with you.
For example: In my experience, SRAM cassettes have not lasted as long as shifted as smoothly as their shimano counterparts. I don't know why this is the case, but it has been consistent through multiple cassettes. As a result, I now run XT cassettes despite being a sram sponsored rider. |
Originally Posted by Chris0381
(Post 5550901)
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 fatigue failure. Or the cassette fit on loosely (poor tolerances of hub or cassette) causing a lot of movement between hub and cassette mating. Or a hub whose metal was too soft. |
Originally Posted by chelboed
(Post 5534961)
l; I used Shimano Deore line all the way to XTR and the only problem I notice is the XTR Ti series seems to have a problem. I have cracked one and so have some of my friends. And lots of them also had them bent and out of shape. Deore, XT and XTR (900 series) has never had a problem. |
Cheap cassette has no carrier. The more expensive cassettes with a carrier don't have the interrupted interface in the splines like the "cheap cassettes" with the complete cogs and plastic spacers. That was a PG970 cassette that ate up my Hope Pro II freehub body.
I hope that makes better sense to you now. There was actually another thread about the freehub body situation. Hope told me it's normal and that I can buy a stainless one for $67.99. The kicker is that the PG970 was on there for between 1-2mos. Way too short a time for so much damage. (IMO) |
Are we unde a consensus that if the PG-800 and 900 SRAM cassetees are not made defective, that they are good cassettes in gerneral and what happened to the poster he is an anomoly.
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I've used SRAM PG-970 cassettes and they've worked just fine for me. I've not had an audible or perceptable knock, I've not trashed my hubs, I've not damaged teeth. I suspect this problem is an unfortunate coincidence.
There's nothing particularly magical about a cassette. It's a bunch of pieces of stamped metal, sometimes plated, with some spacers. I'm sure they can be made "bad" if stamped with worn dies or whatever. But there's no voodoo to 'em. |
Clearly many have had great success with SRAM. Bottom line is that someone has the right to say the heck with a company if that person gets 2 bad items. As others have said, every company has issues at some time - and odds are they all lose customers from it. This is why they all try to hard to avoid it.
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Originally Posted by indygreg
(Post 5573320)
Clearly many have had great success with SRAM. Bottom line is that someone has the right to say the heck with a company if that person gets 2 bad items. As others have said, every company has issues at some time - and odds are they all lose customers from it. This is why they all try to hard to avoid it.
But to the fact that he was complaining about it skipping in the 4th gear, I respect his opinion of being done with SRAM. |
I've been through a lot of Shimano & SRAM cassettes. My last 2 cassettes have been the 970's , not a single problem.Actually ,in my experience, i have found the SRAM 970 to be superior in performance, wear & durability compared to the shimano LX alternative.
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Originally Posted by MattP.
(Post 5573484)
True. If he was running a lower end Shimano casette (with no carrier), I'm sure the same thing would have happened, his freehub being trashed. So I think it's more appropriate to say "Heck with cheap casettes" rather than heck to SRAM.
But to the fact that he was complaining about it skipping in the 4th gear, I respect his opinion of being done with SRAM. Yep, all cheap cassettes will do that to my freehub. My SRAM 970 had the knocking issue (that I could even feel via the pedals) and my red 990 has never shifted as smoothly as my XT cassettes. I don't think the 990 is "junk", I just think that if you're gonna pay more than you would for XT...it should out perform XT. For me, it hasn't. Therefore I will be going back to XT unless I get a killer deal on a 990/980. |
I was just thinking... I got a new SRAM rear cassette for my road bike for Christmas this year. I put it on but assumed my chain was new enough not to need another. It did EXACTLY what you're reporting: a butter smooth drivegtrain suddenly got a lumpy feeling in the pedals in the higher gears starting around the 4th cog. I assumed this was a worn chain, replaced the chain and the problem went away entirely.
Could it be your chain? |
Originally Posted by Chris_F
(Post 5580521)
I was just thinking... I got a new SRAM rear cassette for my road bike for Christmas this year. I put it on but assumed my chain was new enough not to need another. It did EXACTLY what you're reporting: a butter smooth drivegtrain suddenly got a lumpy feeling in the pedals in the higher gears starting around the 4th cog. I assumed this was a worn chain, replaced the chain and the problem went away entirely.
Could it be your chain? |
Im sure this guy is cursing Shimano cassettes:
http://felixwong.com/gallery/show.ph...ike_parts2.jpg With mass production, cheap labor, etc. These parts will fail; its the luck of the draw. |
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