cook bros crank

[vntgmtb]

Hello im looking to convert this Cook Bros E170 crank from road to Mtb.
Does anyone have a compct spider or know where to grab one? and do i need to make any other changes to make this work ? Im happy to purchase or trade for the black one shown in the attached photo

Thanks!

 

[Rampage]

You will need the special granny ring spacers to hold the spider onto the crank arm if you haven´t got them.
Check for cracks around the granny bolt studs too.

You´ve probably worked this out by now though!

 

[freddok]

About Cook granny spacers, if you find a spider, you can take a look on the @synlos repro here : https://www.retrobike.co.uk/threads/repro-mig-ird-ringle-bullseye-cook-syncros-fat-wtb.332892/ . He made it...

 

[DM]

I think I have an new/unused spider somewhere.
Not sure about the bolt pattern, though.

[EDIT] Actually, I don't even know which series crank it's for. It might not even be for the E series. I'll check... [/EDIT]

Sorry -- No go.

Looks like it's the old 5-bolt "standard" MTB spacing (110 mm) rather than compact. As far as I can tell, it matches the following (from Sheldon Brown):
https://www.sheldonbrown.com/cribsheet-bcd.html

"Touring double, standard triple outer"
BCD: 110 mm;
Smallest ring: 33 T;
Between adjacent holes: 64.7 mm;
Between non-adjacent holes: 104.6 mm.

 

[ishaw]

You could just use it with 110 bcd rings. Granny ring bolts double as the spider bolts assuming you have the special spacers.