southpawboston

Has anyone used a Jubilee RD (short cage) on a freewheel with a 30T cog? The short cage version is not listed on disraeli gears, but various reports puts it at 28T. Max capacity is not an issue since i'm only using a single chainring. If others have had success, I may try this myself.

T-Mar

+1. 28T maximum cog. That's the advertised maximum and the actual maximium based on my experience. As I often state, this can be slightly less or more, depending on the hanger length of the actual dropout you're using. Positioning the wheel all the way back in a long, horizontal dropout may also permit you a couple extra teeth, but usually at the expense of shifting crispness.

southpawboston

Darn, I really wanted to make this Jubilee work with a 30T cog. Oh well... Dropout positioning is not an option because this bike uses a claw hanger. Looks like I'll be sticking to the plastic Simplex for now!

TimeTravel_0

I'm sure it will be fine.

"maximum" is not the actual maximum; just a conservative suggestion.

JohnDThompson 

As with the thread on Record derailleur capacity, a lot depends on the dropout/claw. If you have a dropout with a reasonably long slot (e.g. Campy 1010) and/or a long hanger claw you should be able to get up to 28T with it.

OTOH, this bike barely manages a 24T cog with a Jubilee mounted on a Tange TR dropout:

southpawboston

I'm afraid I don't have much fore-aft freedom to play with, as the dropout does not have a derailleur hanger and uses a claw. The axle is already at its most forward position.

This is the derailleur I want to upgrade from:



It was the derailleur my Jeunet was spec'd with originally, and the freewheel is a 14-30T Suntour New Winner, which i chose for its gearing. The original freewheel was 14-24T. I need the 30T cog for some of the hills I have to climb every day. The Simplex actually works just fine and shifts smoothly enough, I just wanted a nice upgrade .

Keeping the bike as French as possible, what other RDs would you recommend?

ColonelJLloyd 

^ BullsEye jockey wheels? Nice.

It would certainly be a pricey item, but didn't Huret make a long cage version of the Jubilee?

southpawboston

Heh, yeah, those bullseye jockey wheels were on it when I got it! I'm something of a sucker for anything with a sealed bearing, so I kept 'em .

According to disreali gears, even the long cage jubilee had a max cog of 28T. I suppose i could swap out my 45T chainring for a 42T, and go with a 13-28T freewheel. That would give me the same gearing as I have now. And the bike would be 5 chain links lighter!

But somehow the idea of a long cage RD on a porteur doesn't feel right...

ColonelJLloyd 

I'll give you my opinion. Chainrings smaller than 44t look dumb. I think that it's even worse on larger bikes. The long cage version has to be able to handle more teeth than the short cage version, right?

They're city bikes, yes, but I wouldn't think a long cage derailleur would be out of place on a porteur. They're pretty utilitarian by nature anyhow (in a "use what works" sort of way).

T-Mar

On both the long and short cage versions of the Jubilee, the cage pivot was also the jockey wheel mount, so the long cage only provides extra chain wrap and did not affect the maximum size cog. To increase maximum cog size you have to change the drop (i.e. claw length), the effective parallelogram length and/or the cage pivot geometry.This didn't happen with the long cage versions of the Jubilee.

ColonelJLloyd 

^ I see. Thanks!

juls

For the jubilee, you would also need a different hanger. That is a nice rdr-coveted even.

southpawboston

The jubilee that I have has its own Huret-marked claw hanger. I installed it once and was disappointed in its inability to negotiate the largest cog, but I also noticed that the cage was pivoted too far back (too many chain links compared with the Simplex). I thought that with the cage pivoted more (by shortening the chain) that it might manage to shift onto the large cog, but I didn't want to play with removing links before I knew that others have had luck.

juls

The jubilee is one beautiful dr (includeing its levers) but they say with beauty comes sacrifice. In this case 2 teeth (LOL)

Sixty Fiver

You must see a lot of dumb looking bikes out there.



People forget to factor in the hangar length when they calculate capacity as with something like a Cyclone or VX GT their range can be as little as 28 with a shorter hangar or they can handle as many as 34 with a longer hangar.

A long cage rear d would not look out of place and if the bike i question is going to get a workout I would want somethinga little tougher than that beautiful looking Simplex and a a little less precious than the Jubilee.

ColonelJLloyd 

I figured it was understood that I was referring to bikes with only one chainring. I stand by my opinion and, yes, I do see a fair amount of bikes that look like they were put together by people who haven't a clue.

nlerner

On my winter commuter last year, I ran a 40t ring w/ a 22t single-speed freewheel. Low is what I needed in those lousy conditions. Maybe I get some style points because it's a Nervar copy of the TA Pro Vis 5 crankset:



Neal

ColonelJLloyd 

I'm giving you a 4 tooth curve because of the chainguard. Pass. Barely.

nlerner

I got off easy--definitely not a C&V chainguard (scavenged from a Redline, I believe).

Neal

southpawboston

but by increasing the hanger length, aren't you also reducing the shifting crispness? i.e., the guide pulley is farther away from the cogs?

Sixty Fiver

40... with a 20 in the rear.





But I know what you are talking about with the "people having no clue thing".

JohnRedman

What is the largest number of cogs that a 1970 version of Jubilee can span? I just got a Motobecane frame with short Huret drops set for this D and just today got my Jubilee package. Putting a Nervar Star crankset, 53 - 42, on and have Campy NR wheels with a Shimano 13 - 28 6 speed FW and hoping they work together. I won't have the cranks for another week and this is far from my only ride, so, I can take my time to get it right. Thanks.

KenNC

Saw this one but don't know how period correct it is....
Vintage Sachs Huret Aris Classic 2500 Long Cage Road Bike Derailleur France | eBay

motogeek 

John, I'm thinking that you're stretching the fragile albeit beautiful Jubilee to the max with a 53-13. It's kind of a delicate derailleur that doesn't like to go to the far end of it's limits very well. I would stick with what Motobecane and others used when they spec'd it on their bikes: 52-40 and 14-26 (or 28 at the max).

I've run the long cage version with a 52-36 and 14-28 successfully on a couple different bikes.

kroozer 

My Motobecane Grand Jubile currently has TA Professional cranks with 36-51 chainrings, and a 14-32 6-speed Shimano ramped-cog freewheel. The Jubilee short-cage derailleur (on a Huret dropout) shifts it just fine for the most part. It does have trouble doing the large-large combination, but I never use that on any bike anyway. I'm pretty impressed how that little bitty thing handles the big spread.