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Campy 29t Cassettes and Short Cage Derailleurs?(6 posts)

Campy 29t Cassettes and Short Cage Derailleurs?gibbons
Nov 8, 2002 6:27 PM
OK, I am 43 and don't ride every day. My mountain bike has a 22 front 34 rear combo for when I am dead tired on 10%ers. This Bianchi EV2 we just aquired has a 39 front 23 rear. Yeah, it kills me on these high altitude Utah hills.

I scored a new Record 13-29 10s on Ebay for $111. But then I started wondering, will it work with my short cage Record rear derailleur?

It sure looks like the geometry on the short is the same as the medium and long cage (except for the cage length), so the relationship to from the top jockey pulley to the cassette should be the same on all three. Right? So it seems that the only real issue is avoiding cross chaining big/big which would bind up the derailleur.

So, can I use the 29t cassette with a short cage if I am careful?

Thanks
re: Campy 29t Cassettes and Short Cage Derailleurs?desmo
Nov 8, 2002 8:50 PM
Short answer yes. I have a 13/29 cassette that I use a couple of times a year and the short cage der has no problem shifting it cleanly. As far as using it fulltime with the short cage there may be wear issues, but I think if your chain length is correct you should be ok. You could also just order a medium cage for your der, instead of buying a whole new unit. Cheap insurance.
Just give up a few gearsKerry
Nov 9, 2002 6:26 AM
To have enough chain length to make the large-large "safe", you're going to have some serious chain slack in the bottom few cogs when on the small chain ring. How many cogs depends on your particular setup. The small-small combo doesn't usually work anyway, so you may only lose 1-2 cogs, and even there, you can ride them with the chain hanging loose. Just don't try it on rough roads because you'll never know where that slack chain will end up if the bike starts bouncing. OTOH if you're ABSOLUTELY SURE there's no chance of your ever shifing into the top two cogs while on the big ring, you can set the chain up to just eliminate slack in the small-samll combo and ride away. A big chance to take IMO, as if you do shift into one of these gears, it's kiss it all goodbye (then you could get that longer cage derailleur!).
cross chaininggibbons
Nov 9, 2002 8:57 AM
Are road bike drivetrains less affected by cross chaining (big/little, little/big) than mountain bike drive trains? I alway's "give up a couple of gears" on the extremes on my mountain bike. If properly set up, can you cross chain a road bike and be OK?
not less affected...C-40
Nov 9, 2002 9:48 AM
You're comparing a double crank setup to triple.

Double chainring road bikes can generally use all but the two extreme crossover gears, but many have a small amount of rub from the chain touching the big chainring in the little ring and next to smallest cog, making that combo marginal.
yes, it will workJohnG
Nov 13, 2002 6:49 AM
I've built a couple of bikes with this combo. It's not ideal but it will work.

Just make sure you cut the chain so that the small-small combo has a derailleur cage "separation" less than 1cm as shown in the Campy der manual.

JohnG