Bicycle Mechanics - Campy rear hub lock ring change?
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I recently bought a used Campy Sirocco rear wheel to use with my Kurt trainer for the winter (to avoid having to change tires- keeping the good road tire on my Fulcrum wheel and putting a trainer tire on the old Sirocco). To my dismay, when I went to put the cassette on it, the lockring (original Campy Chorus) would not fit. I have 2 and tried both, but the diameter of the lock ring appears to be too big. Did Campy change the specs/ dimensions at some point? The splines and hub seems to be exactly the same dimensions, and the cassette fits fine. The wheel is labeled "Sirocco 20" and has a silver high profile rim with bladed spokes laced asymmetrically (radial non-drive side, x1 drive side)
Do I need to find some sort of older lockring (or resell the wheel)?
11-20-09, 05:04 AM
you don't mention what cassette you're trying to fit, and you may know this, but campag have different sized lock rings for 11 and 12 sprocket cassettes, so if you're trying to fit a cassette with an 11 sprocket and using a lock ring for a cassette with a 12, then it will be too big and clash with the chain. Hope this helps.
11-20-09, 07:26 AM
It sounds like you may have the same problem I discovered not long ago regarding Campy 9/10 speed hubs and lockrings. I don't remember all the details, but I beliieve the problem is that before about 1999, but after eight speed of course, there were nine speed compatible hubs that require lockrings that have a smaller diameter of the threaded part of the lockring than the newer ones. The newer lockrings are 27.0 mm diameter (threaded portion of the lockring) I believe. I remember doing some cussing that day, and I don't remember exactly how we solved the problem, but we did. I was simply trying to install a nine speed Campy cassette on an older Campy nine speed compatible wheel IIIRC. I do remember calling Brandford Bike and they gave me the pertinent info, I should have committed it to memory better. I suggest giving Branford Bike a call, they know their Campy stuff like no one else.
11-20-09, 08:18 AM
Lockrings for hubs older than 1999 have a 26mm thread and all those newer have a 27mm thread, so you've got a really old lockring. You also need either an 11T model or 12-13T model.
Thanks everyone- it appears that this must be a pre '99 hub. My lockring and cassette (10 speed Chorus 13-26) are only a few years old (I measured the lockring with my calipers and it is indeed 27mm)- its the hub that is old. I will try and call Branford, but is it even possible to use a 10 speed cassette on this hub if I get (am able to find??) an old lock ring? So much for trying to save a few bucks. Maybe I will just try to sell the wheel cheap and start over.
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