I was surprised too, for a 1985, the Sugino GT chainset is 110bcd, about 65mm between bolt centres.
Here's more Sugino GT info:
http://velobase.com/ViewComponent.aspx? ... 7&Enum=115
I'm thinking about changing my chainring to a smaller 34T on my 1985 Raleigh Record Sprint, it has the Sugino GT chainset.
I think it's a 110mm BCD, but I'm not sure.
Any suggestions?
Thanks.
This type: