Carving in a XTR M95x cranks?

Discuss light weight issues concerning mountain bikes & parts.

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Mattias Hellöre
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by Mattias Hellöre

I have cleaned and removed paint on ny XTR cranks, theýre hollow right?

Wondering about shave them in the backside.

Weighing at 408 gr without spindle, lockring.
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XTR95untuned.jpg
Experimental Prototype

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Mattias Hellöre
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by Mattias Hellöre

I just milled off the backside of a non drive crank.
Uneven thickness in the hollowgram forging process made it a unsafe experience to mill it off.

The arms are down to 396 gram from 408 now but I think it will not be worth it?
I milled away only one arm, so I may shoot to 380 gr but durability will be a issue.

I will test them in a fairly safe environment first.
Experimental Prototype

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shovelon
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by shovelon

Hi Mattias,

Are you sure those are hollow? They look lightyears away from my XT Hollowtechs. Your XTR arms look too squared off me.

Look for a seam at the pedal end, and inside the threaded hole too. Were there any depressions on the area that you milled?

I like the idea of shaveing the hollowtechs. More material could be removed from around the pedal I think.

Terry
Down there? DOWN THERE???

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STATO
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by STATO

shovelon - these XTR's were the first ones they made hollow [xt at the time were still solid], they were made from a U shaped piece with a plate welded on the back then machined, so you wont find an seams or anything. Also the thickness should be reasonably even id have thought.

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enté
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by enté

shovelon wrote:Are you sure those are hollow? They look lightyears away from my XT Hollowtechs. Your XTR arms look too squared off me.

One of the best cranks made ever! And use the Hollowtech technology.
http://www.fa-technik.adfc.de/Herstelle ... M952-4.jpg
http://kobu-mtb.no-blog.jp/photos/uncat ... nk_01s.jpg
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ridley86
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by ridley86

those polished ones are pimpin

CGT
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by CGT

Honestly I prefer the "normal" version to the polished one. But I agree that the 952 crankset is one of the best ever made!

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Mattias Hellöre
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by Mattias Hellöre

How stiff is these crank?
I milled away a lot as you can see here.
Attachments
milledXTR95X.jpg
Experimental Prototype

Rickhughes
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by Rickhughes

Those cranks were ran by all of the dh pro's at the time along with xc racers so i expect there pretty stiff and strong.

What bb do they run, octalink or splined?

Is there such thing as a light octalink bb if they do indeed use this fitment?

Rick

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enté
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by enté

Mattias Hellöre wrote:How stiff is these crank?
I milled away a lot as you can see here.

With this process you made a huge mistake!
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Mattias Hellöre
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by Mattias Hellöre

enté wrote:
Mattias Hellöre wrote:How stiff is these crank?
I milled away a lot as you can see here.

With this process you made a huge mistake!


Mistake?
Give me constructive critics or you are like Gunkillah.
Experimental Prototype

LloydP
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by LloydP

Rickhughes wrote:Those cranks were ran by all of the dh pro's at the time along with xc racers so i expect there pretty stiff and strong.

What bb do they run, octalink or splined?

Is there such thing as a light octalink bb if they do indeed use this fitment?

Rick


they run the "original" octalink with the short splines (not the later version with long splines), as used on the road cranksets. I use mine with a Dura Ace BB which weighs ~150g...only problem for some people is the short spindle might cause interference between chainrings and chainstays on some frames

chrism
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by chrism

Mattias Hellöre wrote:
enté wrote:
Mattias Hellöre wrote:How stiff is these crank?
I milled away a lot as you can see here.

With this process you made a huge mistake!


Mistake?
Give me constructive critics or you are like Gunkillah.


If you want more details, then they are now no longer hollowtech, and are a huge amount less stiff and strong than they were, and by far larger a proportion than the amount of weight you saved. the whole point of those cranks was to have a tubular section, and you now no longer have that!
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collideous
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by collideous

ridley86 wrote:those polished ones are pimpin


I sanded off the original finish on mine, gave them a nice fine brushed finish, and anodized them black. Doesn't look bad either. Quite some work for a bike build that is currently on the backburner.
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by CGT

Oh come on man, what have you done to those beautiful cranks?!?!

First of all, as chrism wrote, you've reduced the stiffness quite a lot. Weight saving is good, but not when it affects the stiffness as much as in this case. Second of all, how much weight have you actually saved? Was it worth it?

Anyhow, it's too late now, so at least finish it of nicely by sanding the rough edges so that it looks nice!

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