Ultegra Crank Arm Bolts

supermurph09

Hi, not sure what the correct term is but I can't find what I'm looking for. I regularly swap crank arms from one bike to another as I have a Stages PM, however I've managed to just about round the bolts off so need to find where I can get some from

It's not the middle thing that requires a special tool, it's the 2 hex key bolts that I need.

Can anyone link me to where I can get spares?

Thanks

supermurph09

I understand these are called pinch bolts.

farrina

I would suggest that you peruse the Shimano technical site to identify the part number you require here http://si.shimano.com/#seriesList/38 and then see if the likes of SJS Cycles can help here http://www.sjscycles.co.uk/ with the part

supermurph09

Thanks for this, I've actually managed to find some titanium ones on Amazon. Cheers

Giraffoto

Supermurph09 wrote:

Thanks for this, I've actually managed to find some titanium ones on Amazon. Cheers

They do a very important job, this may not be the best place to save weight. Or I may not know what I'm talking about, always a possibility.

supermurph09

Giraffoto wrote:

Supermurph09 wrote:

Thanks for this, I've actually managed to find some titanium ones on Amazon. Cheers

They do a very important job, this may not be the best place to save weight. Or I may not know what I'm talking about, always a possibility.

I figured the titanium would be stronger and potentially make it harder to round off. I'll know soon enough! :shock:

desweller

Titanium is prone to galling (picking up under friction) on the thread surface. I would use high tensile steel screws.

clogg

DesWeller wrote:

Titanium is prone to galling (picking up under friction) on the thread surface. I would use high tensile steel screws.

^^^^ True, I have had to remove a couple of titanium bolts in stems that have sheared off as a result of galling. With a stages crankarm it could become expensive if this happens.

dgunthor

clogg wrote:

DesWeller wrote:

Titanium is prone to galling (picking up under friction) on the thread surface. I would use high tensile steel screws.

^^^^ True, I have had to remove a couple of titanium bolts in stems that have sheared off as a result of galling. With a stages crankarm it could become expensive if this happens.

would having a titanium washer help?

dj58

If you are going to use those Ti bolts make use you an use anti-galling coating and do not over torque. Otherwise stick with the O.E. grade HT fasteners.
http://www.estainlesssteel.com/gallingofstainless.html