"Retro Bob" <[email hidden]> wrote in message
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Quoted message said:
Easy question:
Are TA Cyclotouriste chainwheels the same bolt pattern
as Stronglight 49 ? Will the TA triple bolts work on the 49 ?Harder question for advanced students:
On Sheldon's site, it says that you want to do a half step plus
granny" setup with this TA crank. It infers (if I'm reading it right)
that it will be difficult to shift the small to medium wheel if the
medium is not close in size to the large (outer) chainwheel.http://sheldonbrown.com/harris/french-cranks.html#cyclotouriste
I'm having trouble grasping this, or I'm just reading it wrong.
Why would the medium to large size chainwheel relationship
impact the small to medium shift ? I would think that you'd want
the medium closer to the middle of the range for the smoothest
shifting from the small to medium.I have no reason to doubt Sheldon... just trying to understand
the issue.Thanks,
BobFrank J Berto author of the book "Cmplete Guide To UPGRADING YOUR BIKE is
the definitive work on gear shifting (he was quote "a wee bit biased
towards half- step plus granny" ) he didn't invent the arrangement but
named it.
On page 141 a picture shows the position of the front mech set up for a 52
40 28 c/rings with the 52 T ring removed this illustrates just how high
above the 40 T ring the front mech is and thus the problem of shifting from
middle ring to outer ring with the Eighties type front mech.
PK