Deore Crankset O-ring

trail jacker

Hi,

I got a Deore crankset off a mate at the weekend, barely used. I think its missing an O-ring from where the axle joins into the crank spider (that the chainrings bolt to), which prevents the BB bearings being crushed. Does anyone know where I can get one from?

Thanks

trail jacker

Also (I'm new to hollowtech cranks if you hadn't gathered) there seems to be a screw missing from the inside of the non-driveside crank arm which I thought was tightened to preload the bearings... if so, will I need a replacement?

Thanks!

Chunkers1980

Haves look at a doc doc, it'll show you what you should.

trail jacker

A doc doc?

Chunkers1980

Sorry tech doc. Damn iPhone.

Chunkers1980

One of the PDFs:

http://www.shimano.com/publish/content/ ... ype-..html

nicklouse

the o ring is pressed intp the arm and only keeps (or tries) to keep dirt out. i will be supprised if it is not there.

and sounds like you need a new peload bolt.

see Parktools and shimanos webby for fitting infos.

trail jacker

Ah yeah, I see the o-ring, looks like I just need a new crank arm fixing bolt to preload the bearings when I fit it. Ta for the pointers guys!

nicklouse

trail jacker wrote:

Ah yeah, I see the o-ring, looks like I just need a new crank arm fixing bolt to preload the bearings when I fit it. Ta for the pointers guys!

not a fixing bolt. a preload bolt. they are two different things. and you done want the wrong one.

trail jacker

This not the right one then? http://www.chainreactioncycles.com/Mode ... elID=32877

..when used with this... http://www.chainreactioncycles.com/Mode ... delID=3785

nicklouse

that is a preload bolt. does not need to be tight as all it does is add preload.

the pinch bolts actually hold the arm in place.

trail jacker

Cool, cheers again