Ken Freeman wrote:
> Something doesn't sound right here. I had my '80 Masi cold-set
> from 120 to
> 126 right after I got it, years back. The spindle was not
> replaced, AFAIK.
> The chainline was correct, both measured and based on even shifting
> and
> wheel dish, in both cases.
>
> If I'm going to add a gear to a 5-speed, and the wheel will be re-
> dished,
> and the cluster must remain centered on the crankset center plane,
> then why
> should the distance from the crank center plane to the frame center
> plane
> increase, due to addition of rear cogs?
>
> The consequence of Chuck's claim is that every time a frame is cold-
> set, the
> BB must be considered for replacement. I never heard this before.
>
> Ken Freeman
> Ann Arbor, MI USA
Ken writes, "The consequence of Chuck's claim is that every time a frame is cold-set, the BB must be considered for replacement. I never heard this before."
This is troubling to me Ken. It is not my claim that 120 marked on the center of the Campagnolo axle refers to dropout spacing. Are you saying that you don't believe it? And who claimed that there are different Campagnolo BBs axles made for 126 mm spacing or 130 mm spacing and that they need to be replaced when cold setting the dropouts to a different dimension?
Campagnolo track (Pista) axle markings in Catalog 17 (1974): 65-P-110 68-P-110 68-P-120 70-P-120
Campagnolo road (Strada) axle markings in Catalog 17: 68-SS-120 70-SS-120
QUOTE: -- The first number indicates the bracket width -- P indicates track -- SS indicates road -- C indicates cross -- Number 110 or 120 indicates the suggested width of the rear hub for a perfect chain alignment
I made no claim (I would have written "this is only my opinion" if I were making a claim)... I was just quoting Campagnolo. And there are no consequences to bottom bracket axle dimensions every time a frame is cold-set other than the act of cold setting a frame should be carefully considered before proceeding. That would be the reason you never heard of this before.
Yes, something doesn't sound right here.
Chuck Schmidt
South Pasadena, CA USA
http://www.velo-retro.com (reprints, t-shirts & timelines)