I didn't mean to imply that alloy 3-arm crank spiders are not safe,but rather would like to know why we don't see them anymore.Perhaps failure was one reason, fashion may be another. There is a Campy three-arm GS (like the one I run on my Legnano GP, on e-bay right now and it has a cracked spider arm. Alloy 5-arm spiders are also subject to cracks and we're told to file the cracks to "relieve" the stress. Perhaps the 5-arms fail less than the 3 because the stress is spread out over more points. Maybe its not even an issue, especially for the recreational rider. Art Link,San Antonio,TX,USA
John Wirt <frankensaab@earthlink.net> wrote: Date: Sat, 8 Dec 2007 14:49:19 -0500 (EST) From: John Wirt <frankensaab@earthlink.net> To: "classicrendezvous@bikelist.org" <classicrendezvous@bikelist.org> Subject: [CR]Three-arm crank spider question.
Art; I have a 3-arm GS crankset on my mid-70's Bertin. Is this crankset NOT safe?
john boise, id usa
Date: Fri, 7 Dec 2007 12:23:02 -0800 (PST) From: Art Link To: classic rendezvous Subject: [CR]Three-arm crank spider question.
In days of yore many crank spiders were 3-armed(F.B.,Magistroni,Simplex.Campagnolo GS,Chater Lea,Bianchi Paris -Roubaix model,Canondale Coda,Schwinn Paramount and Superior) yet one sees almost exclusively 5 -arm Spiders today. Is this because the old steel ones were stronger than modern alloys and simply didn't break under stress or is it a modern "fashion" preference.I like the look of the 3-arm spider and they might actually save weight. Were any 3-arm alloy spiders known to break(i.e.Campy GS) ? Art Link,San Antonio,TX,USA
_______________________________________________
The Columns on Alamo Welcome to our bed and breakfast in San Antonio, Texas. Come fiesta with us! We offer off-street parking, and the downtown trolley stops just a 1/2 block away! All rooms have a private bath, TV and telephone. Wireless Internet Access available in all rooms (EXCEPT the Rockhouse Cottage) Please contact us if you have any questions, thanks! (210)271-3245 · (800)233-3364 · ArtLink@ColumnsSanAntonio.com