Chainring Question

Kenneth Clements said:

Hi all

As I'm of advancing years I thought I would have change from lugging
my loaded tourer over mountain passes and would like to lower the
gearing on my road bike. I currently have a Campag Racing Triple
chainset 52/42/30 and would like to fit outer and middle TA
chainrings 44t and 39t with a PCD of 135mm but TA don't do a Campag
74mm PCD for the inner. I would like to know if the 30t 74mm PCD inner
ring on the Racing
Triple is an ATB ring? If so I can fit a 24t.

You can indeed fit any 74mm 5-hole 24t ring. It's a standard size used for
various road and old ATB triple chainsets including Campag and some Shimano.

See www.settlecycles.co.uk/shop/options.asp?tid=156&pid=533 : TA alloy, free
post.

Or a steel one (from SJSC?) might be worth thinking about if you'll use it a
lot and want maximum life.

Ramped & pinned middle rings: www.dotbike.com/ProductsP1678.aspx

By the way, a long* cage Campag mech will actually cope with 24/39/50 +
13-29 and similar, despite what Campag say, so a 44t outer wouldn't be
necessary for that reason.

* current versions, longer than old "triple" ones.

I wouldn't mind a 25t 74mm myself. Anyone know where I could find one (if
they exist).

~PB

"Pete Biggs" <[email hidden]> wrote in
message news:[email hidden]...
snip

Quoted message said:

By the way, a long* cage Campag mech will actually cope with 24/39/50 +
13-29 and similar, despite what Campag say, so a 44t outer wouldn't be
necessary for that reason.

* current versions, longer than old "triple" ones.

I wouldn't mind a 25t 74mm myself. Anyone know where I could find one (if
they exist).

~PB

Thanks Pete. My triple dates from 2000 and the rear mech I think is known as
Medium Cage and has a 20t capacity, that's why I'm going for a 44t outer.

Ken.

"Pete Biggs" <[email hidden]> wrote in
message news:[email hidden]...

Quoted message said:

See www.settlecycles.co.uk/shop/options.asp?tid=156&pid=533 : TA alloy,
free post.

Or a steel one (from SJSC?) might be worth thinking about if you'll use it
a lot and want maximum life.

Settle sell them too, even though they're not listed. 10 quid IIRC, cf 17.5
quid incl P+P from SJSC (splutter).

The stronglight one on the MTB tandem has now started working very well
(initially I was getting chainsuck, but that's actually stopped happening
now. And an MTB tandem is probably close to worst case abuse of chainrings.

cheers,
clive

Kenneth Clements said:

Thanks Pete. My triple dates from 2000 and the rear mech I think is
known as Medium Cage and has a 20t capacity, that's why I'm going for
a 44t outer.

I'm sure you could use a larger one than that.

Official total capacity for Campag 2000 Triple mechs is 37t, and Campag
assume you want the small-small combination to work perfectly, when of
course it doesn't really matter if the chain droops on the mech when
(accidentally) in that gear.

I can't find the "front difference" for the 2000 Triple rear mechs (it's 22t
for 2001), but this spec always puzzles me anyway. Why does the rear mech
care about that as long as the total capacity is ok?

I found a 2001 Racing T rear mech worked reasonably well with 26/39/52 +
13-27. That cage length was equivalent to today's Medium.

~PB

in message <[email hidden]>, Kenneth Clements

(') said:

"Pete Biggs" <[email hidden]> wrote in
message news:[email hidden]...
snip

Quoted message said:

By the way, a long* cage Campag mech will actually cope with 24/39/50 +
13-29 and similar, despite what Campag say, so a 44t outer wouldn't be
necessary for that reason.

* current versions, longer than old "triple" ones.

I wouldn't mind a 25t 74mm myself. Anyone know where I could find one
(if they exist).

Thanks Pete. My triple dates from 2000 and the rear mech I think is known
as Medium Cage and has a 20t capacity, that's why I'm going for a 44t
outer.

Go for a long cage mech if you want a wide range of gears.

--
[email hidden] (Simon Brooke) http://www.jasmine.org.uk/~simon/

;; Men never do evil so completely and cheerfully as when they
;; do it from  religious conviction."          -- Pascal

"Pete Biggs" <[email hidden]> a écrit:

Quoted message said:

I wouldn't mind a 25t 74mm myself. Anyone know where I could find
one (if they exist).

Pace used to make them. Somebody either sold a very large number of them or
repeatedly failed to find a buyer for the same one on eBay last year.

Highpath will make you one, of course.

James Thomson

"Kenneth Clements" <[email hidden]> a écrit:

Quoted message said:

My triple dates from 2000 and the rear mech I think is known as Medium
Cage and has a 20t capacity, that's why I'm going for a
44t outer.

I used a 1999 Racing T derailleur with 24-36-48 and 12-27 without any
problems, and I don't think that was pushing its limits, so I don't think
you need to limit your large chainring size so drastically.

James Thomson

"Pete Biggs" <[email hidden]> wrote in
message news:[email hidden]...

Quoted message said:

Kenneth Clements said:

Thanks Pete. My triple dates from 2000 and the rear mech I think is
known as Medium Cage and has a 20t capacity, that's why I'm going for
a 44t outer.

I'm sure you could use a larger one than that.

Official total capacity for Campag 2000 Triple mechs is 37t, and Campag
assume you want the small-small combination to work perfectly, when of
course it doesn't really matter if the chain droops on the mech when
(accidentally) in that gear.

I can't find the "front difference" for the 2000 Triple rear mechs (it's
22t for 2001), but this spec always puzzles me anyway. Why does the rear
mech care about that as long as the total capacity is ok?

I found a 2001 Racing T rear mech worked reasonably well with 26/39/52 +
13-27. That cage length was equivalent to today's Medium.

~PB

OK, I'm going with 24/39/46 and 13-28. Putting the bike and the tent in the
car this year.
Always fancied some Cols on the Road Bike.

Thanks, Ken.

It may be easier to leave the chainrings as they are and buy a bigger
block.

I forgot to mention my tip for improving shifting perfomance & reliabilty
when using a 24t with a Campag triple.

Offset the inner ring inwards with chainring spacers or washers by 1 to
2.5mm.

Otherwise setting up is much trickier, shifting has to be slower, and still
the chain will sometimes miss despite your best efforts. A Chain Watcher or
Dog Fang won't do the job so well, though one could be fitted as well.

If not using http://tinyurl.com/yak3ff , make sure the outer diameter of
your washers isn't so large that it fouls the chain.

~PB