10 speed rear mech with 9 speed drivetrain

For discussions about bikes and equipment.
User avatar
pedalsheep
Posts: 1029
Joined: 11 Aug 2009, 7:57pm

10 speed rear mech with 9 speed drivetrain

Postby pedalsheep » 27 Jan 2019, 4:48pm

Will a Campag Veloce 10 speed medium cage rear mech work ok with 9 speed Veloce shifters, 9 speed cassette, front mech and chain and TA Carmina triple chainset? Silver Campag 9 speed rear mechs in good condition are very hard to find but there are plenty of 10 speed ones available. Some people have said it will be fine but I am concerned I may be just asking for trouble.
'Why cycling for joy is not the most popular pastime on earth is still a mystery to me.'
Frank J Urry, Salute to Cycling, 1956.

User avatar
foxyrider
Posts: 4516
Joined: 29 Aug 2011, 10:25am
Location: Sheffield, South Yorkshire

Re: 10 speed rear mech with 9 speed drivetrain

Postby foxyrider » 27 Jan 2019, 7:39pm

well i'd certainly run it and I've gone the other way too using 10s for 11s.

Some of the latest incarnations may not work well - or so I've read.
Convention? what's that then?
Airnimal Chameleon touring, Orbit Pro hack, Orbit Photon audax, Focus Mares AX tour, Peugeot Carbon sportive, Owen Blower vintage race - all running Tulio's finest!

Keezx
Posts: 418
Joined: 20 Dec 2014, 10:44am
Location: The Netherlands

Re: 10 speed rear mech with 9 speed drivetrain

Postby Keezx » 27 Jan 2019, 7:52pm

Any 10 speed Campagnolo rear mech is compatible with any Campagnolo 9 speed drive train after 2000. (levers with rounded hoods_)

Brucey
Posts: 35610
Joined: 4 Jan 2012, 6:25pm

Re: 10 speed rear mech with 9 speed drivetrain

Postby Brucey » 28 Jan 2019, 12:20am

so 'old' ergos look like this

Image

and are compatible with pre-2000 mechs (which are 8s and 9s) and don't work with 10s mechs because they have a different shift ratio.

Post 2000 ergos look like this

Image

and these are compatible with 10s mechs, so you can use 9s ergos that look like this with a 9s cassette and a 10s rear mech.

So it would all be very simple when buying rear mechs except that in several campag gruppos there are post 2000 mechs that are labelled as '9s' but have the same shift ratio as 10s mechs. The other thing that can catch you out is that with used ergos, they may have been converted internally to a different specification.

edit the other way of telling which flavour of RD you have is to look at the 'B' tension screw adjustment. 'Old' campag 9s mechs look a bit like shimano ones, i.e. they have a 'b' tension screw on the upper knuckle, like this (RD-RE018)

Image

whereas 10s (i.e post-2000) mechs have a tension screw adjustment (that does the same job) on the lower pivot instead.

cheers
-------------------------------------------------------------------------------
~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~

User avatar
pedalsheep
Posts: 1029
Joined: 11 Aug 2009, 7:57pm

Re: 10 speed rear mech with 9 speed drivetrain

Postby pedalsheep » 28 Jan 2019, 10:35am

Thanks guys.
My Ergos are the post 2000 type and the rear mech would be the most recent Veloce 10 speed model as they are the most widely available so it sounds as though it should all work fine.
'Why cycling for joy is not the most popular pastime on earth is still a mystery to me.'
Frank J Urry, Salute to Cycling, 1956.

AndyK
Posts: 794
Joined: 17 Aug 2007, 2:08pm

Re: 10 speed rear mech with 9 speed drivetrain

Postby AndyK » 28 Jan 2019, 11:55am

I've been running a Xenon 10-speed rear mech with my 9-speed Veloce levers and cassette for some time now. It works for me.