March 06, 2008

Quasi-Moto Spec.




4 comments:

Anonymous said...

Something wrong with the rim diameter here?--should it be 584 and not 597?

Cracked Headtube said...

ETRTO is 584. Outer rim diameter can differ

Anonymous said...

584 is the "bead seat diameter"

Cracked Headtube said...

OK lets get this straight.
Good ol' Sheldon Brown's site comes in handy, may he Rest In Peace.

"Bead Seat Diameter
The Bead Seat Diameter (B.S.D.) is the crucial dimension that determines whether a particular tire can fit onto a particular rim. It specifically refers to the "shelf" like area inside the rim where the tire's bead sits.
The Bead Seat Diameter is the fundamental dimension used in the ISO/E.T.R.T.O. system of tire and rim sizing. This is the great virtue of that system, compared to all of the older systems that referred to the tire's outside diameter, with no specific reference to rim diameter nor to the rim/tire interface. "

Cited: "http://www.sheldonbrown.com/gloss_ba-n.html"