Re: now 753 Frame Flex, was: [CR]SR BB question

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From: <gpvb1@comcast.net>
To: classicrendezvous@bikelist.org
Subject: Re: now 753 Frame Flex, was: [CR]SR BB question
Date: Thu, 02 Jun 2005 17:57:43 +0000


Date: Thu, 2 Jun 2005 11:27:56 -0400 From: "kohl57@starpower.net" <kohl57@starpower.net> To: classicrendezvous@bikelist.org Subject: RE: [CR]SR BB question

Original Message: ----------------- From: Tom Dalton tom_s_dalton@yahoo.com Date: Thu, 2 Jun 2005 06:47:39 -0700 (PDT) To: gpvb1@comcast.net, classicrendezvous@bikelist.org Subject: [CR]SR BB question

"Both types of ti BB feel more flexy, do they not?

Tom Dalton Bethlehem, PA"

Hmmm... maybe that helps account for it. One of the benefits of having a fleet of bikes is to compare and contrast the "ride" as much as the bikes.

My new 1980 TI Raleigh Team Pro just feels a lot "different" from my others. The geometry feels more upright (more like my Cinelli) than the '75 Team Pro yet the ride is less "hard" if that makes sense. Is this due to 1) 753 tubing, 2) titanium bb spindle or 3) my first splurge with "proper" tubulars: Clement Criteriums? Or, as likely, all three?? Whatever it is, it's different and nice.

Peter Kohler Washington DC USA

Peter: 753 (as opposed to 753R) frames are pretty flexy - definitely not harsh. Look down (briefly - don't crash!) at your fork blades at speed as they hit small bumps, or during spirited braking - lots of flex fore and aft. Remember that 753 was right at the limit of steel tubing technology in its day. It was very, very thin stuff, and the tube diameters were "traditional" (i.e. relatively small). The top tubes exceed the long-standing Engineering guidelines for buckling - which is a 50:1 ratio of diameter to wall thickness. 753 top tubes are closer to 60:1 IIRC.... Yes, it's somewhat flexy, but light and comfy, and if you are a spinner like me, even in a large frame size, it's a good compromise (in my opinion!). Greg Parker Ann Arbor, Michigan