changing cogs on Veloce 10 cassette

dabber

I'm currently running a 12-27 (Miche) but I'm considering getting a 13-29. I've got a nearly new Veloce 12-25 cassette. Could I replace the 13 with the 12 from this spare cassette? The 13- 29 goes 13/14/etc. If I went to 12/14 would that be too big a jump at that end of the range?

Monty Dog

The shift would probably be pretty rough as the sprocket teeth aren't aligned correctly - the chain may ride on the top rather than meshing smoothly.

cycleclinic

The miche sporckets are different to the Veloce ones. Miche cassettes are designed to work with the same width spacers between cogs. Campag cogs are seperated by spacers of different widths.

dabber

Both the cassettes I would use are Campag Veloce 10.
The Miche is a 12-27 which is currently on the bike.

I have spare (little used) Campag 12-25 Veloce from which I was thinking of robbing the 12 sprocket. This would go on a yet to be purchased Campag Veloce 13-29 to replace the 13 sprocket.

Hope that makes sense. :?

Monty Dog

If you download the Campagnolo technical manuals you'll find references to mixing and matching cassette sprockets - each are given a letter designation and if you mix the letter designations expect the shift to be rougher than a badger's ar$e!

dabber

Thanks for the advice. I just looked up the manual.... one of the first things it says is that I could die if I use different combinations ... but going on from that.

the 13 sprocket is numbered 13A-1°
the 12 sprocket is numbered 12A-1°
This is when both of these are the smallest sprocket.

There are different codings for when the 12 and 13 are not the smallest sprocket.
Therefore, and I'm guessing, the A-1°coding seems to indicate it might be ok.

Of course, I might be misinterpretting the chart.

JamesB

Well if it`s any help for you I have several times constructed my own 12-29 from a combination Of Centaur / Chorus 12/25 and 13/29; the set up I use has been:

12-13-14-15-17-19-21-23-26-29;

the 17-19 is quite a big jump and can be a little rough --but better than a badgers arse --as the teeth are not properly aligned for a slick change; BUT it works and I`ve used it in Pyrenees / Alps / Spain to good effect, ie kept a super low for the big climbs if needed but also a good top for fast descents

dabber

Thanks James. That's a lot of help. Actually, I hadn't thought about using other sprockets from the original Veloce 12-25. As you have illustrated I don't necessarily have to just use the 12 sprocket, I could use others and decide where to make the bigger jump.

philkeeble

I'm running Veloce 10-speed but using an off-the-shelf 12-29 cassette from Miche.

Only problem I've found is that if the cable tension is set for a slick shift up from the smaller sprockets then it tends to very slightly overshift/rub when in the biggest sprockets (3,2,1). If tension is set for slick shifts on the big sprockets, then it's reluctant to shift off the smallest sprockets (10 & 9) without a bit of an over-shift at the lever. Have had the derailleur hanger re-aligned which has improved matters but I'm thinking about making up some thin spacer washers to fit between sprockets 1 & 2, and 2 & 3 then sdjusting for slick shifts on the small sprockets.

cycleclinic

One guy on the CTC foprum cam across this same problem. his solution was to move the cable to the other side of the anchor bolt and this altered the cable pull slightly and enough to solve the porblem.

rolf_f

It depends on how you like hills but the 13-29 is a fairly extreme cassette! I have one and use it on very hilly sportives and not much else. I did wonder about making it into a 12-29 but I've not bothered and really I don't think it is worth the bother. Most of the time I just use an 11-25 and keep a specific chain for the 13-29 for when I need it. It's only occasionally that I notice that I'm missing that higher gear and my cadence is usually sub optimum anyway so it probably does me no harm pedalling a bit harder!

JamesB

It depends on how you like hills but the 13-29 is a fairly extreme cassette

in a way I agree I use such a cassette extensively but rarely use the 29T; BUT when I do I`m glad I`ve got it--I see it as an `emergency `bail out gear for either extremely steep hills or when off form / knackered

Sometimes I think I`ll ditch teh 29 setup for 12-25, but then have a day when I use the 29 (like yesterday poor road surface 20% ramp on Shropshire Highlands Challenge, weighed down by lunch and overheating in a rainjacket too )

dabber

Thanks for all the advice... very useful. I'm not sure what I'll end up doing but at least I've got a few options to consider.
I agree with the comment regarding a 13-29 being quite extreme... especially as I also run a compact.
However, I ride about a third of the year in France and most rides end up with quite a few cat 3/4 climbs (according to Strava) which aren't problematic with my current 12-27 setup but on which my cadence drops pretty low.
My general cadence has tendency to be fairly low (low 70's) and I'm actively working on getting it higher (80+) so I think a 29 might be useful on some of these climbs.

rolf_f

JamesB wrote:

It depends on how you like hills but the 13-29 is a fairly extreme cassette

in a way I agree I use such a cassette extensively but rarely use the 29T; BUT when I do I`m glad I`ve got it--I see it as an `emergency `bail out gear for either extremely steep hills or when off form / knackered

Sometimes I think I`ll ditch teh 29 setup for 12-25, but then have a day when I use the 29 (like yesterday poor road surface 20% ramp on Shropshire Highlands Challenge, weighed down by lunch and overheating in a rainjacket too )

Just get the 12-25 and use both. In the long term it costs nothing as cassettes and chains are consumables - all you are doing is giving yourself a choice. I think both have their uses but there is no point carrying gears around that you don't use on 9 trips out of 10 so the 13-29 only comes out when there is lots of really steep stuff!