Is there anything I can do with these cranks?

[thesku11s]

I found these at the back of an old bike shop and was well chuffed as I really needed some,

that is till I realised none of my takagi, sr & sugino chainrings would fit neither would other mtb & road rings I had.

And then to top it off I realise that for some strange reason, on of the pedal holes has been drilled out to 18mm or so.



They are Thun 170mm cranks, made in germany. The pedal holes are supposed to be 14mm.


Ive heard that its possible to get inserts for stripped threads put in, is this easy? is it worth it?

And is it even possible to get hold of a chainring to fit?

ANy help greatly appreciated.

Also if anyone thinks they could use them, let me know.

[sawzall]

what side arm is shot as i think i have a drive side kicking around 

[thesku11s]

what side arm is shot as i think i have a drive side kicking around 

Wow really!

what are the chances of that?

yeah it is my drive side that is sporting a large hole.

Thing is it mustve been done for a reason? surely they originally has some sort of insert or why would someone drill them out?


I take it you know what chainrings might fit these then?

[Jt]

the bin..then ebay for some proper cranks, then paypal, then sorted!

[selfpreservation]

no get some flights they were w4nk in the first place

[lazychubs]

i have a set of those and have a chain ring too
but my drive side has stripped the thread as none of me pedals fitted em lol

[TwoBobRob]

You could get that crank arm repaired.  The insert you're thinking of is called a helicoil, assuming the current hole isn't too big for the helicoil then it would be a fairly easy fix.   As for a chainring that fits, might be easier to get a local machine shop to either drill out your preferred chainring, or make a tophat spacer to suit - whichever it is you need  

[lazychubs]

i have a chain ring if you want it
as my cranks are fubar

[sawzall]

i have a drive side in red 170 mm with chainring just cover the post and its yours

[thesku11s]

i have a drive side in red 170 mm with chainring just cover the post and its yours

how awesome are you guys???   

this is why rad is so great, a proper community 

there was me thinking Ive got some freak useless cranks that nobody has heard of, and no one would be interested in helping me with.

and it turns out most of you have had a pair!

And a few of you are even offerring me bits for free!

would be great to have that frive arm and chanring sawzall, will pm you...

also might as well have some of the others as spares.

thanks a lot everybody.

[sawzall]

its yours mate,pm me your address and i will get it in the post,