Campag Record Rear Mech (1980)

[merseymouth]

Hi there, Does anyone happen to know what the capacity is for the mech? I want to use a 6 speed 13t - 28t freewheel, so would the mech cope? TTFN MM

[Vetus Ossa]

If you want to use a 28t sprocket you will need a Super Record mech. The Record max is supposed to be 26t, and in my experience is.

[tatanab]

1980 Record? Did they still do the steel Record model in 1980? 1975 Bike Riders Aids shows Nuovo record and states 13-28 http://www.disraeligears.co.uk/Site/Hol ... ge_44.html Agreed that Super Record went to 28.

[merseymouth]

Hi again, Maybe a word or three to explain further? I say 1980, I could be wrong, as that may well be when I bought it but it could have been old stock?
It will of course be hanging from a Tricycle Gear Bracket and not a drop-out hanger, so will be further away from the block.
It is the ability to keep chain tension I need most of all, you know more than I do. Keep at it chaps. TTFN MM

[merseymouth]

Hi Tatanab , I have just read the reference you posted which was very enlightening . As I will only be using a single 36t or 37t chainring the Record should manage quite nicely, as it says it provides more than enough take-up. Very useful detail in that site. Thanks very much Guys. TTFN MM

[Vetus Ossa]

I have three bikes with Nuovo Record mechs and 13-26t freewheels and the jockey wheel practically touches the sprocket on all of them. It’s possible with some jiggling with chain length and positioning in the dropout you could get it to work. As that doesn’t seem to be an issue for you I would try it and see. I have a bike with a super record mech and 28t sprocket that works without issues.

BTW this is what Velobase has to say about the Nuovo record rear mech.
http://velobase.com/ViewComponent.aspx? ... &AbsPos=52

[tatanab]

MM - something you can do on a trike that is not always practical on a bike is to remove the threaded pin that stops the mech unwinding all the way. This means you can have a bit more chain which might help with the bigger sprocket. I admit that it is likely to make gear changes on the small sprockets less precise but on the trike with the old gear hanger they are not going to be precise anyway.

[foxyrider]

I have three bikes with Nuovo Record mechs and 13-26t freewheels and the jockey wheel practically touches the sprocket on all of them. It’s possible with some jiggling with chain length and positioning in the dropout you could get it to work. As that doesn’t seem to be an issue for you I would try it and see. I have a bike with a super record mech and 28t sprocket that works without issues.

Is that a mod. 76 Super Record or the later flat plated model? I never used my '76 'back in the day' with anything larger than 24 but I'm considering trying for a 28 on my L'Eroica build.

[Mick F]

It'll do 28t without issue.

Those mechs all had the same parallelogram geometry. I had a Rally, and later had the use of a Super Record. They were all the same. My Rally had a Nouvo Record parallelogram and 28t was easy.

As for "capacity" I don't know. Capacity is all in the length of the jockey cage.
There's a big difference between "max sprocket" and "capacity".

Capacity is the difference between the sum of the the teeth Small/Small subtracted from the sum of the teeth Big/Big .

[Brucey]

ah but it isn't just the parallelogram geometry that determines capacity. Both the rally and SR mech have different pulley cages from the NR mech (that put the top pulley in a different place) and therefore have different capacities in terms of the largest sprocket.

Needless to say if you stick a NR mech onto a set of standard short pattern campag DO's, you can use a 26T sprocket and that's yer lot, just like it says on the tin.

cheers

[Vetus Ossa]

ah but it isn't just the parallelogram geometry that determines capacity. Both the rally and SR mech have different pulley cages from the NR mech (that put the top pulley in a different place) and therefore have different capacities in terms of the largest sprocket.

Needless to say if you stick a NR mech onto a set of standard short pattern campag DO's, you can use a 26T sprocket and that's yer lot, just like it says on the tin.

cheers

As Brucey says...

[Mick F]

.......... and as I said!

As for "capacity" I don't know. Capacity is all in the length of the jockey cage.
There's a big difference between "max sprocket" and "capacity".

[Brucey]

if you had actually tried it you would know; max sprocket with NR mech/dropout = 26T

cheers

[Mick F]

I've not tried a NR, but I had a SR for a short while and that worked with 28t from what I can remember.
My Rally worked with 28t for definite.
Same parallelograms but with different embossed (not painted) writing on them. I had the early sort of Rally, the one without the top bit, and despite what Velobase say, it shifted very well indeed with my Suntour Ultra.
http://www.velobase.com/ViewComponent.a ... 0fdb1887e5

It may be true what you say regarding the top jockey position - you have far more knowledge than me. The thing is, the cage rotates and as it rotates, the top jockey moves with respect to its height. Maybe that's what I'm saying. The stated limits can be exceeded sometimes IME.

As for capacity, that is an entirely different thing. Max size is one thing, and capacity another. Two totally different unrelated parameters.

[Brucey]

I've not tried a NR, but I had a SR for a short while and that worked with 28t from what I can remember.

yes, it is a different mech with a different max sprocket capacity.

cheers