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Conference noted::bicycle

Title:	Bicycling
Notice:	Bicycling for Fun
Moderator:	JAMIN::WASSER

Created:	Mon Apr 14 1986
Last Modified:	Fri Jun 06 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	3214
Total number of notes:	31946

2149.0. "SG and non-SG chainrings" by NAC::GULICK (Those dirty rings !!) Mon Dec 16 1991 17:29

	I want to change the chainrings on my wife's Centurion LeMans
	from the current 52-42 Biopace (Shimano Exage road group) set-up
	to a 52-39 round set-up. 

	In looking through my Performance catalog (with who I have a big
	gift certificate to use up), I see they list a Shimano 600 Ultegra
	39T non-SG ring and a 52T SG ring.

	My question/problem: Is it OK to mix SG and non-SG chainrings on the
	same crank set-up ? What is the difference ? Is this just Shimano 
	marketing hype ?                                 

	I know what Hyperglide is but I can't find any mention of Superglide
	or its predecessor in this conference. 

	thanks,
	-tom

T.R	Title	User	Personal Name	Date	Lines
2149.1	Should be able to do it...	ASABET::D_SWEENEY		`Tue Dec 17 1991 09:58`	6
	Most of the time and the key word is most! If you stay within the same brand of components, the Chain rings should work on the cranks, So Shimano to Shimano should work.... Dan
2149.2	Check bolt circle dimension	NQOPS::CLELAND	USIM&T Data Center Services	`Wed Dec 18 1991 07:12`	9
	>My question/problem: Is it OK to mix SG and non-SG chainrings on the >same crank set-up? What is the difference? SG = "Super Glide" Superglide chainrings are round. As in, non-biopace (non-oval). What you need to check is something called the "bolt circle". If this value is the same on both chainrings, then, wowsers...
2149.3	otta be ok	NOVA::FISHER	Rdb/VMS Dinosaur	`Wed Dec 18 1991 09:41`	6
	Given the same bolt circle, you can mix Super Glide with non Super Glide. I think it's only the big ring that matters anyway in a double because it has teeth slightly cut to help shifting and I can't see how that can help the small ring. ed
2149.4	thanks	NAC::GULICK	Those dirty rings !!	`Wed Dec 18 1991 13:04`	10
	re .3 Thanks, that's the info I was looking for. The bolt circle is the same for Ultegra and the Exage chainrings (also for Ultegra and 105, since I'm changing to round rings on my bike as well). -tom