geo
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re:Shimano Cassette with Campy Rear Derailler? - 2009/09/16 08:33
Hi ,
I have an interesting problem for you.
My girlfriend has been in an accident and has a bad back so I am changing her road bike to have flat bars to be in an easy position. I am going to use a shimano 9 speed flat bar shifter with existing campag 9 sp rear. Even though it is said that they can be compatible, I want to do it accurately to rule out the chance of an accident due to a bad shift. So changing the thickness of the spacers is the way I am going to do it.
Bike: gipiemme sonic boom, early to late 1990’s.
It has an “OEM” carbon fork and twin pivot campag brakes and a square taper bottom bracket.
Derailer: campag mirage
Casstte: 9sp campag- indivdual sprokets
All the spacers are he same except for the one for the second smallest sprocket which is 0.11mm thiner (why??). The smallest sprocket has its own spacer built into it and is 0.40mm thicker than the rest of he spacing (why??).
I work in an engineering shop and have measured the thickess’s of all the sprockets and spacers accurately.
Sprockets: 1.75 – 1.79 mm
Spacer: 2.83 mm
General spacing = 4.60 mm
But second smallest sprocket spacer: 2.72 mm
And smallest sprocket: 5.00 mm
TOTAL COG SPACER
CAMPAG 4.55 1.75 2.8
SHIMANO 4.34 1.78 2.56
GIPIEMME 4.34 1.77 2.57
The 2.72mm spacer is a grey matt colour and not at all see through. The 2.83 spacers are a orange gloss colour and are sort of see through.
Web pages say the shimano spacing is 4.34mm so I am manufacturing some spacers 2.57mm thick this weeek.
But what abour the 2.72mm spacer and the 5.00mm sprocket/spacer??? Would there be any reason for this? What spacing should I make for the two smallest sprockets? I could put the smallest sprocket on the surface grinder and take off 0.66mm to make it shimano spacing of 4.34mm-what do you think? Or should I only take off 0.21mm=the difference between shimano and campag? Is every “click” of the shifter giving the same amount of cable travel? Is the derailer giving the same amount of axial movement for the given cable travel, at the limit of its axial movement? (at the position of the two smallest sprockets) (what I am asking here is, does the derailer move the same amount for every shift? Or does it change as it gets to the last two “clicks”?
To add more confusion to the matter, the smallest sprocket is 5.00mm thick for most of its circumference, but steps down to 4.45mm on a “~2 tooth portion” of the circumference. This is where little the triangle and circle are stamped.
can you help?
Geoff.
geoff kelland<geoffkelland@yahoo.com>,
gkelland@hofmann.net.au
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