Yes, to affect steering the stack height reduction does have to be below the head tube, but that is exactly what the measurement I made identifies. Actually, lowering the front changes (makes steeper) the head tube angle with respect to the horizontal support plane. This increases trail, which increases stability, which makes it harder to steer, and hence turns are initiated less quickly than before. But does anyone whose done it on a bike that's near the "sweet spot" (i.e. you love the handling!) recall how significant the effect is? I know I do not notice a handling change as I move a rear wheel forward and back in the chainstay end, as long as I keep the wheel straight.
Aspirin and some good pictures are prerequisites to understanding trail
Ken Freeman, A^2 Michigan.
-----Original Message----- From: classicrendezvous-bounces@bikelist.org [mailto:classicrendezvous-bounces@bikelist.org] On Behalf Of Thomas Adams Sent: Saturday, February 26, 2005 9:47 AM To: classicrendezvous@bikelist.org Subject: RE: [CR]Was: Reman Part -- Now: Campy/Tange Headset
Doesn't the change in stack height have to be below the head tube to effect the steering? So the entire stack height difference won't affect the frame geometry, only the difference between the two lower bearing assemblies that changes the fork crown position relative to the head tube. Anything in the upper bearing assembly merely lowers the handlebars (if the steerer is trimmed) or requires and extra spacer, but doesn't alter the geometry of the frame. Presumably the stack height change that will affect geometry is about half of the entire stack height differential, a number I would expect to be too small to notice. If I have this wrong, I invite correction by those who have a better grasp of goemetry and frame design. I know when I try to understand trail I get a headache.
Tom Adams, Shrewsbury NJ
Steven Willis <smwillis@verizon.net> wrote: Seems like it would but all I see is the frame would more likely want to go in a straight line and any bike that does not like to turn sets up some not too great handling traits. But I think the small amount would not change it very much so it would be a go. Steven
The Bike Stand 1778 East Second Street Scotch Plains NJ 07076 908-322-3330 http://www.thebikestand.com
-----Original Message----- From: classicrendezvous-bounces@bikelist.org [mailto:classicrendezvous-bounces@bikelist.org] On Behalf Of Ken Freeeman Sent: Saturday, February 26, 2005 7:25 AM To: classicrendezvous@bikelist.org Subject: RE: [CR]Was: Reman Part -- Now: Campy/Tange Headset
Regarding the Campy/Tange headset replacement. I was thinking of doing this until I noticed that the Tange is shorter than the Campy, and would lower the front of the bike by about 5 mm. Measuring the Tange Levin CDS from the crown race seating face to the lower fixed cup seating face, it's about 0.445 inches tall. Similar measurement for a Campy Nuovo Record, I get about .589 inches. Difference is about 3.7 mm. Is this enough to affect handling? Seems it should add to stability by increasing trail.
Ken Freeman Ann Arbor, MI
-----Original Message----- From: classicrendezvous-bounces@bikelist.org [mailto:classicrendezvous-bounces@bikelist.org] On Behalf Of Thomas Adams Sent: Friday, February 25, 2005 8:53 PM To: classic Rendezvous Subject: Re: [CR]If you could have one part remanufactured what would it be?
Two problem solvers needed:
Huret Jubilee adaptors for Campy drop outs. I bet you could sell a bunch of these but getting set up to manufacture them might be prohibitive.
Campy NR Pista headsets for steerer tubes cut too short. Especially needed when the frame had a Strada headset, you decide to run centerpulls and there's no room for the $%@! hanger because some knucklehead bobbed the steerer just as short as possible in the murky past. I know you can use a Tange, but it would be nice to be able to use a real Campy headset.
Tom Adams, Shrewsbury NJ
Bradley Woehl asks:
"If you could have one bike part remanufactured from pre 1984 what would = it be?"
Although this topic has come up in past discussions, I would like to = know your choice.
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