I'm sure suntour microdrive inner rings have a 2mm smaller bolt diameter, compared the shimano compact drive. I can remember middleburn RS2's coming with a chice of three spiders for a while (MTB, compact and microdrive)???
Yeah, that's right. Obvously Shimano's marketing and volumes meant most people and manufacturers followed their measurements. Microdrive became a little redundant in most bike shops.
My mate is still looking for a Red microdrive granny ring for his toplines...proving rather difficult!
1990 Marin Team Titanium, 1991 Marin Team Titanium, 1993 Marin Team Titanium, 1994 Marin Titanium FRS, 1995 Marin Team Titanium, 1995 Marin Eldridge Grade, 1996 Marin Team Titanium, 1998 Marin DH FRS, 1999 Marin Team Titanium, 1999 Marin Mt. Vision Pro, 2000 Marin East Peak, 2002 Marin Mount Vision
1988 Concorde Colombo, 1997 Colnago Master Olympic, 2005 Look KG481-SL, 2009 Look 586
WANTED: Marin Titanium - pre 1990, 1996 FRS, 2007 25th anniversary