frogman

I need a pair of jockey pulleys for a 1984 Trek 770. It has a Campagnolo Super Record rear derailleur 7 speeds. I looked on the forum and found a reference to Shimano TY05 pulleys that may work. The old pulleys are cracked and need replacement. Any Ideas ?

dddd

Next time that you see a cheap bike tossed out with someone's trash, look to see if it has Shimano derailers. The pulleys will usually still be good, and will work fine on the older Campag rear derailers.
If the top pulley has sideways "float" movement then install that one on the bottom position on your derailer (it'll work better if you're friction-shifting).

ltokuno

$12 plus shipping.
https://www.ebay.com/itm/Replacement...EAAOSwhxJdMLLy

frogman

thanks for the info !

smontanaro 

Can you post a picture? Campagnolo pulleys from that era routinely cracked. As far as I know, they never broke. How are the pulley teeth? If they are okay, I'd just continue to use them.

jamesdak 

I'm trying these right now on a Victory RD.

https://velo-orange.com/products/gra...heels-10-tooth

frogman

Here's the jockey wheel. Im scared to ride it until I replace it.

https://i.postimg.cc/XY1rPMQ3/IMG-3956.jpg

SurferRosa

I see this a lot. Cracked ... and has probably been cracked for years and years. Don't worry about it. Or how 'bout mix up some jb weld. Or push some glue (Sugru?) in there.

frogman

Yeah I probably wouldn't have noticed it, seldom look at the jockey wheels, but thought I would lube them and noticed this cracked one. So is this common with the older Campy jockey wheels ?

smontanaro 

Common as in, "they all do that." I suspect something related to the plastic molding process and them all being 35+ years old now. Notice how straight the crack is? I wonder if the plastic ever completely melted together there. (This is just speculation though. I know nothing about casting plastic.)

Kabuki12

Of all my Campy RD's I only have 2 that have not cracked. I haven't had one actually fail though. It is a possibility but after several years I haven't had it happen. For some reason two of my derailleurs are good on both jockey wheels .

pcb 

I'm having that deja vu feeling all over again. Didn't this just come up? Or does most everything come up again, sooner or sooner?

I bought a box o' 10pr Shimano Pulley Set, marked "TY05/15/20/22/30/CT92/MJ05." Yep, all those.

Buy a single pair, pay $8+. Buy a box of 10pr for around $20, $2/pr.

The Golden Boy 

Red Bullseye pulleys- the Campagnolo replacement for 45 years.

smontanaro 

Maybe on CR. It was definitely "in the news" recently. Overwhelmed by other news though.

Steel Charlie

I can't believe this is still going!!!

I mean WTF is gonna be checking your pulleys for authenticity********** Get some Shimano (they're better anyway) and MOVE ON!

Shirley there is something important in your life to attend to.

frogman

No need to be sarcastic steel charlie. Go for a ride and chill out.
Also what does Shirley have to do with it, does she have bad jockey pulleys too ?

top506

Funny thing, though. You never see cracked ones on the cheap Valentino RDs. Every NR that's passed through my hands has had at least one cracked pulley.

Top

Steel Charlie

Hmmmmmmmmmmm - and humor challenged too

maybe not surprising for someone OCDing on pulleys

So here's the question I ask - If I had a mechanism with a faulty component and that component had a world-wide rep for being faulty and there were a number of perfectly suitable replacement components from other sources that do not demonstrate that fault why would I look to replace the faulty component with another of the same type?

SurferRosa

I've had more than a dozen derailleurs with Campy wheels and never had one fail. None of my current fleet has any cracks in any of the wheels. His is an SR derailleur. Guys like myself that value SR as something very special will want it to be as authentic and good looking as possible.

​​​​​​

malcala622

@frogman Can you post a picture of your 770?

Steel Charlie

I have SR on two bikes and one has Shimano and one has Bullseyes - the red Bullseyes look pretty cool on the candy red Colnago and they are nearly as old.
FWIW I began replacing Campy pulleys asa I discovered that others would fit. Shimano pulleys even shift better

JMO of course as functionality always comes first, Philistine that I am.

smontanaro 

My observation here is one that has been made since the earliest days of the Internet: nuance and humor are often not well expressed in plain ascii text. If you intended sarcasm, I think it would have been better if you added a suitable smiley or "/s". I, for one, didn't interpret your post as humor. Finally, if you were tired of the thread you could have just unsubscribed from it so you weren't notified of new responses.

dddd

I'll just add another voice testifying to the usability of a Campag pulley with a crack in it.

I believe that the pulleys only crack because the plastic shrunk, creating tension around the metal bushing. Once cracked, the tension is relieved while the pulley remains usable and even reliable.

randyjawa 

I, for one, would notice non-original anything on a bicycle. I am into the vintage thing and strive for original as I build. It, often times, takes me years to find everything that I need. While waiting for this or that, I use what will work and Shimano jockey wheels will work just fine.

The question is - does the OP want to restore or ride. One pushes one in get it as correct as one can. The other says use what works, works better or works best.

Though just a theory, i bet you will find that the further north you go, the more cracked jockey wheels you will experience.

It is not uncommon, where I live, to see temperature swings in excess of 100 degrees celcius - 90 degrees in the summer and minus 30 degrees in the winter. Those wide temp swings can and will cause the plastic to expand and shrink. If the bike is stored in an unheated area, that might be the cause of cracked pulleys. Unless, of course, Dupont Delrin happens to be involved. If that is the case, the plastic will crack when it darn well feels like it.

frogman

Sure will. It is all apart now I am cleaning, replacing cables and housings, lubing the hubs, etc. After I get it assembled I will post a picture.