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 Post subject: Crank question...
PostPosted: Fri Dec 04, 2020 11:31 am 
Dirt Disciple

Joined: Sun Aug 02, 2020 1:55 pm
Posts: 45
Festive greetings. I know I have asked this question before but the answers were brilliant if a little technical. I have a 97 Kona explosif. The original Sugino mighty 900 left arm crank is threaded. I have a set of XT M739 cranks which are the same length. The question is can I just use these with the current Sugino rings? Bike in storage hence the question.Cheers.


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 Post subject: Re:
PostPosted: Fri Dec 04, 2020 11:37 am 
retrobike rider
retrobike rider
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Joined: Fri Aug 08, 2008 2:36 pm
Posts: 18983
Location: Yorkshire, England
Probably not.
M739 uses a spider fitting and normally has a special top ring and then has 4 holes for the chainring.

Your sugino will use a compact 5 hole setup.

You may have a 5 hole adaptor on the 739 crank.
If you have that, then yes the ring should swap over.

If you need pictures, just ask.
But pictures of what you have helps the guessing :-)


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 Post subject: Re: Crank question...
PostPosted: Fri Dec 04, 2020 11:54 am 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 10423
Location: New Forest, UK
If the Mighty 900 is 170mm I would be interested in buying. The thread can probably be repaired with a helicoil.


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 Post subject: Re:
PostPosted: Sat Dec 05, 2020 3:48 pm 
Retro Guru

Joined: Sat Oct 04, 2014 9:01 am
Posts: 361
Location: Cod's country
Have an adapter to convert M739's to compact 94/58 bcd if you need one.


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 Post subject: Re:
PostPosted: Sat Dec 05, 2020 7:29 pm 
Gold Trader
Gold Trader
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Joined: Fri Jan 23, 2009 2:30 pm
Posts: 17077
Location: Surrey
The rings might fit if the m737 cranks are the 94bcd 5 arm spider version rather than the version with the spider integrated into the outer ring.


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