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 Post subject: Sugino GT chainset
PostPosted: Sun Mar 03, 2013 10:07 pm 
Dirt Disciple

Joined: Tue Feb 12, 2013 6:55 pm
Posts: 29
I have acquired a Sugino GT chainset, double, 110BCD with 50/36 chainrings, in great condition. Just trying to work out what BB length to use with it?
It seems that there was also a GS version of these cranks - 130BCD presumably designed for road use, e.g. 42/52, and then the GT version for touring, in double or triple.
This page shows a 123mm traditional BB for the GS version, but not sure if that would also be the case for the GTs?
http://backroom.hardsdisk.net/sr300.html


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 Post subject: Re: Sugino GT chainset
PostPosted: Sat Nov 30, 2013 6:28 pm 
Dirt Disciple

Joined: Sat Mar 09, 2013 7:21 pm
Posts: 77
Location: Norfolk
Hi Did you ever get sorted out with your BB length I have just picked a Gt double chainset in great condition, and am trying to find out the BB Length ?????


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 Post subject: Re: Sugino GT chainset
PostPosted: Sun Dec 01, 2013 11:20 am 
Retro Guru

Joined: Fri Dec 28, 2012 5:02 pm
Posts: 1273
Location: north hamshire
i guess the square tapers are the same as shimano ? id be interested. It might have to be an experiment jobby
i would have thought those lengths quoted are for triples and you may be able to get away with 113mm.


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 Post subject: Re: Sugino GT chainset
PostPosted: Sun Dec 01, 2013 12:18 pm 
rBoTM Winner
rBoTM Winner

Joined: Fri May 20, 2011 5:59 pm
Posts: 641
Location: West Yorkshire
These axles were looooong.

Velobase says 124.5 mm which is a 3U according to Sheldon Brown

http://velobase.com/ViewComponent.aspx? ... f3d7a1caf7

http://sheldonbrown.com/bbsize.html

The 3 means it should fit an English 68mm bottom bracket

I have a 3M of the nutted type which is 120mm ignoring the threaded section.

Don't make the mistake of getting an American fitting BMX bottom bracket though :wink:


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 Post subject: Re: Sugino GT chainset
PostPosted: Sun Dec 01, 2013 1:10 pm 
Dirt Disciple

Joined: Sat Mar 09, 2013 7:21 pm
Posts: 77
Location: Norfolk
Hope this may help I found this after spending age on the net. I am going towards the 3SS axle as I am using a GT Double.

http://www.equusbicycle.com/bike/sugino ... 56%201.pdf


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 Post subject: Re: Sugino GT chainset
PostPosted: Sun Dec 01, 2013 1:45 pm 
rBoTM Winner
rBoTM Winner

Joined: Fri May 20, 2011 5:59 pm
Posts: 641
Location: West Yorkshire
I imagine one of those would be hard to find but I guess it would probably work


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 Post subject: Re: Sugino GT chainset
PostPosted: Sun Dec 01, 2013 9:10 pm 
Dirt Disciple

Joined: Tue Feb 12, 2013 6:55 pm
Posts: 29
In the end I assumed the taper was JIS and went with a Shimano UN55 bb with 122.5mm axle length, 68mm shell. It does seem to be the right length to give a 44mm chainline on my bike, measured from middle of DT to part way between big and little rings. Hope this is useful!


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