Originally Posted by Pritesh Patel
Hi all.
Thanks for reading first of all - I'm very new into cycling and have just started to shed a few pounds. I just wanted to clarify something as i feel i may have been ripped off from a local bike shop!
I have a claud butler milano with campag shifters and a 9 speed.
It had a 53/39 at the front and a 11-25 at the back.
I was finding i was having trouble climbing hills so i thought that i could change the back cassette to a 11-34 or similar at the back and so purchased a shimano 11-34 cs-hg-50-9.
(I undertand that i may have needed to buy a long cage rear mech)
When i went to my local bike shop, one of the staff told me that it wasn't possible to change my cassette to a shimano as only campag cassette will work with campag shifters and that if i did want to use that shimano cassette, i would need to buy new shifters as well.
So i spent a few £'s changing to a compact 50/34 and a 11-28.
Was i fed a lie or was the staff member correct?
I understand that it can be difficult to say for sure, and will gladly answer any further questions that may be needed for clarity!
Thanks all for your help!!
In theory, the Cog spacing is different between a 9-speed Shimano & a 9-speed Campagnolo Cassette ...
And, in theory, for indexed shifting to work properly, the rear derailleur's cage needs to move a specific lateral distance per shift ...
AND so, in theory a 9-speed Campagnolo shifter will
not work with a 9-speed Shimano/-compatible Cassette ...
BUT, due to the RAMPING on the Cogs a 9-speed (and, later) Shimano compatible Cassette, it can in fact be used [
presuming the rear derailleur's stops are set, appropriately] with a 9-speed Campagnolo shifter with the
caveat that the shifter will probably NOT find all the Cogs ...
So, the people in the shop were mis-informed.
Originally Posted by Pritesh Patel
Is there a limit to the maximum teeth capacity that one can put on a bike with campy xenon 9 shifters?
The shifters are NOT affected by the number of teeth on the Cogs which the Cassette has ...
- While the largest Cog which Campagnolo currently has on their Cassettes is a 29t, it seems that one can theoretically use a Cassette with a 34t with a Campagnolo rear derailleur, BUT the chain wrap seems to be come less-and-less as the Cog becomes larger so that the chain may wrap around only about 1/3rd (?) of the teeth on the Cog instead of about 1/2 the teeth [I have NOT confirmed this, yet] ...
- As you suspect, the problem (?) which you will probably face is with the amount of chain which your current rear derailleurs cage will-or-can handle ...
- Again, due to the benefits of ramping, you do NOT need to substitute a Campagnolo rear derailleur with a longer cage for the one which you are currently using ...
- And, you can use a Shimano MTB rear derailleur which will find 8-out-9 of the Cogs on a Shimano Cassette when mated to a 9-speed Campagnolo shifter ...
As you can see in the following
matrix (
and, as you may know) there are two generations of 9-speed Campagnolo shifters (
the "early" version with the pointed "horns" & the more common, "new" version which had the rounded "horns") ...