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'08 XT Crank and chainring wear concerns.

1K views 11 replies 8 participants last post by  luffy 
#1 ·
A couple of weeks ago I replace my crankset with an '08 XT crankset.
This is a replacement of a Truvative crankset that used the almost X Type
BB. No real complaints with it, I just switched to XT as I found a smoking
deal on a new XT crankset.

Anyway, after only about 6 rides I notice the large chain ring already has
what to me is significant wear. I would think I should see virtually
no wear after only 6 rides. I imagine I spend less than 15% of my time
on the big ring.

Any comments? AM I doing something wrong? Is this normal? Do
XT chainrings wear unusually fast? Should I just ignore it and ride?

PS: Other than this I love the XT crankset.
 
#3 ·
chas_martel said:
A couple of weeks ago I replace my crankset with an '08 XT crankset.
This is a replacement of a Truvative crankset that used the almost X Type
BB. No real complaints with it, I just switched to XT as I found a smoking
deal on a new XT crankset.

Anyway, after only about 6 rides I notice the large chain ring already has
what to me is significant wear. I would think I should see virtually
no wear after only 6 rides. I imagine I spend less than 15% of my time
on the big ring.

Any comments? AM I doing something wrong? Is this normal? Do
XT chainrings wear unusually fast? Should I just ignore it and ride?

PS: Other than this I love the XT crankset.
I wouldn't call 6 rides "unusually fast" but "totally unusual"
 
#5 ·
Furrner said:
Sounds like it is wearing fast. Did you put a new chain on there as well or reuse the old one?
Chain is new as well. It only had a couple rides on it when I got the crankset. Also
only the large chainring is wearing fast.

I've read in a few places people were replacing XT rings with RF rings. I thought
that was not neccessary with the'08 XT stuff?
 
#6 ·
I am not a big fan at all of Shimano and their XT cranks (well the new outboard bearing cranks at least). My first set lasted 10 years (square taper and solidly built), and lately the stuff they make is not good value at all (good bling value though). They make good reels though.

I am ready to throw my 760's in the garbage. Too much maintenance on these puppies trying to keep them clean and noise free. I have to clean the surface of the bearing a lot to get sand and dirt off so they don't creak and grind the whole race.
 
#7 ·
Wildeyes said:
I am not a big fan at all of Shimano and their XT cranks (well the new outboard bearing cranks at least). My first set lasted 10 years (square taper and solidly built), and lately the stuff they make is not good value at all (good bling value though). They make good reels though.

I am ready to throw my 760's in the garbage. Too much maintenance on these puppies trying to keep them clean and noise free. I have to clean the surface of the bearing a lot to get sand and dirt off so they don't creak and grind the whole race.
Wow! My experience is exactly the opposite with square taper. My previous
outboard bearing crankset, the Truvativ, lasted way longer than any other
BB I've used. I like how easy they are to clean and lube. Ditto on the Shimano
XT BB. Biggest problem with the Truvative GigaX is that it is not an X-type
so replacement BB's are harder to pick up at a LBS.

'course I might change my mind if the largest chainring keep wearing as fast
as it is. I hear getting RF chainrings is the way to go. at least that is
what google seems to be saying.
 
#8 ·
Wildeyes said:
I am not a big fan at all of Shimano and their XT cranks (well the new outboard bearing cranks at least). My first set lasted 10 years (square taper and solidly built), and lately the stuff they make is not good value at all (good bling value though). They make good reels though.

I am ready to throw my 760's in the garbage. Too much maintenance on these puppies trying to keep them clean and noise free. I have to clean the surface of the bearing a lot to get sand and dirt off so they don't creak and grind the whole race.
thats a shame but what does it have to do with the OPs question
 
#9 ·
chas_martel said:
A couple of weeks ago I replace my crankset with an '08 XT crankset.
This is a replacement of a Truvative crankset that used the almost X Type
BB. No real complaints with it, I just switched to XT as I found a smoking
deal on a new XT crankset.

Anyway, after only about 6 rides I notice the large chain ring already has
what to me is significant wear. I would think I should see virtually
no wear after only 6 rides. I imagine I spend less than 15% of my time
on the big ring.

Any comments? AM I doing something wrong? Is this normal? Do
XT chainrings wear unusually fast? Should I just ignore it and ride?

PS: Other than this I love the XT crankset.
need to see a pic. the truvativ chainrings are aluminum I believe, and the big ring on the xt is also aluminum, the middle is the steel/carbon combo
is it wearing out or are you bashing it to death?
 
#11 ·
dan0 said:
thats a shame but what does it have to do with the OPs question
Nothing really. This isn't Shimano's first "chainring issue" either. They have done some stupid things with chainrings in the past, and the fact that the new XT line might be still wearing fast is funny. Why is it that everyone buys another brand of chainrings to go on their Shimano cranks?
 
#12 ·
Are you sure you're not confusing the smaller teeth with premature wear? Usually on Shimano cranks, the chainring teeth at positions 1 o'clock and 7 o'clock are shorter to aid shifting. Check were you see wear, is it identical directly across the chainring? If so, its designed like that.
 
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