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Discussion Starter · #1 ·
I bought a new Shimano 2007 XTR crank, when I was installing it, I notice that the the left crank arm doesn't fit. The grooves on Octalink was oversized and does't fit.
How Shimano sells a expensive defective crank from XTR group?!
 

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Discussion Starter · #3 ·
Well I order it by internet ($298.00 at Germany) but I go to my LBS here in Portugal and there XTR crank is on the same, like mine.
I think the solution is grinding the grooves at the Octalink, that I'm doing right know, and it's almost done.
But for a XTR, is not for grinding to install it. I'll make a complain tomorrow.
 

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Surfas said:
Well I order it by internet ($298.00 at Germany) but I go to my LBS here in Portugal and there XTR crank is on the same, like mine.
I think the solution is grinding the grooves at the Octalink, that I'm doing right know, and it's almost done.
But for a XTR, is not for grinding to install it. I'll make a complain tomorrow.
Where did you get it from... bike-components.de?? I am in Germany.....

well..if you already worked out a mod.... ok...
 

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mountainforce said:
Holly jesus your stupid! Its a taper fit ( i know because i measured it) when you put the right hand crank arm on the axel (octalink as u call it) it only goes on a few mm. You HAVE to put the crank bolt in and tighten it down VERY VERY Tight for the arm to push onto the axel!

If you have ground the octalink kiss bye bye to your cranks - there supposed to be tight!
That confirms what I was worried about... that this guy didn't know the system on the new XTRs.... well.. there goes all that money I guess...
 

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Discussion Starter · #7 ·
Don't worry, I just grind a little. And Mountainforce I know that I have to put the crank bolt in and tighten, but I don't expected to tight so hard. But today is almost done. And I still think that are something wrong, I think is a little to force to put the crank on the axel!
 

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Discussion Starter · #8 ·
Well I'm thinking and I have some questions about how tight is needed to install the crank, because before I grind the grooves, I make so much force that the crank bolt don't go more, and there was a little more to push, but the bolt don't move.
What do you think, are the problem from the crank or I just need to go to the gym to practice to install the new XTR crank?
 

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Surfas said:
Well I'm thinking and I have some questions about how tight is needed to install the crank, because before I grind the grooves, I make so much force that the crank bolt don't go more, and there was a little more to push, but the bolt don't move.
What do you think, are the problem from the crank or I just need to go to the gym to practice to install the new XTR crank?
It should only go in until it bottoms, not necessarily until the end....

www.cyclingnews.com said:
The more solid attachment should be stiffer than the current pinch-bolt arrangement and may eliminate some user error during installation as the large alloy mounting bolt is simply tightened down until the crank head bottoms out on the spindle.
http://www.cyclingnews.com/tech.php?id=tech/2006/features/xtr_first_1
 

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Discussion Starter · #10 ·
OK that I already know it, but the force to push it until the crank head bottoms out on the spindle is so strong that I suspected and thinking that the bolt can snap. On my previusly 2003 XTR, it wasn't necessary any force to install it.
 

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Surfas said:
OK that I already know it, but the force to push it until the crank head bottoms out on the spindle is so strong that I suspected and thinking that the bolt can snap. On my previusly 2003 XTR, it wasn't necessary any force to install it.
I understand that.. because the XTR 960 used a pinch bolt system just like XT.... are you sure the crank has not bottomed yet???

Maybe if you post a pic or 2 it would be easier to understand your point....
 

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Surfas said:
OK that I already know it, but the force to push it until the crank head bottoms out on the spindle is so strong that I suspected and thinking that the bolt can snap. On my previusly 2003 XTR, it wasn't necessary any force to install it.
It's a new design. Get a torque wrench so you can torque it to spec.
 

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flipnidaho said:
It's a new design. Get a torque wrench so you can torque it to spec.
Yeah... tapered designs don't go "all the way in" (because of the taper).. you just need to insert them until the spec torque is reached... and that's it...
 

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Discussion Starter · #14 ·
Well the problem is that my 8mm hex wrench (Park AWS-11) has a little handle, tomorrow I'll buy a better 8mm wrench for that.
And now I only have 1.5/2 mm to bottom. But is a really tight fit.
 

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Surfas said:
Well the problem is that my 8mm hex wrench (Park AWS-11) has a little handle, tomorrow I'll buy a better 8mm wrench for that.
And now I only have 1.5/2 mm to bottom. But is a really tight fit.
you mean 1.5-2mm until the end of the taper? could it be that the crank bottoms before the end of the taper? I haven't installed a set of these yet, but usually tapered cranks (like square taper) don't go in and cover the whole axle.... just a suggestion...
 

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Discussion Starter · #17 ·
Yes, 1.5-2 mm to the end of the taper. And they need to bottom at the end os the taper.
Yes, I have the expanding colar.
I have done everything like Shimano tells in Instruction, just the force that is needed to install the left crank is so much, that I think ist is possible to broke the 8mm crank bolt.
But they tells to install the bolt to 45-55 Nm and for that is a strong force.
Tomorrow I'll buy a proper 8mm wrench with a 200mm handle to try to puch the rest of 1.5-2mm.
 

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yup i had the same issues

when installing it the first time. it takes ALOT of force to go on, but nothing broke
and it has been fine. the spindle does have about 1-2mm space at the end of the
crank arm.
 

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Discussion Starter · #20 ·
It's done

Well it wasn't grinding, it was only soften the edges of the grooves. But you all help me.Today I buy a proper 8mm hex wrench with a 200mm handle, and it wasn't needed so much force to install the crank. I usually say that the proper toll is the secret of the good mechanic, and myself take it wrong in that department. But is installed and no arm done, thanks for your help.
 
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