On Mon, 20 May 2019 16:37:32 -0700 (PDT),
Sir Ridesalot wrote:
On Monday, May 20, 2019 at 5:12:22 PM UTC-4, wrote:
On Monday, May 20, 2019 at 4:09:15 PM UTC-5, wrote:
On Monday, May 20, 2019 at 12:30:19 PM UTC-5, Tom Kunich wrote:

So I will have to get a conversion set of 11 speed Campy
to go to a gear set that large and that is now so
expensive that I will have to weight a long time.
^^^^^^
Freudian?


I have gone over the "official" large cog size on a few
different cassettes and rear derailleurs and never had any
problems. Just remember to never use big-big or
small-small. Not difficult.

You're looking for a 10 speed Campagnolo cassette with 32
teeth. OK. Campagnolo does make a 30 tooth cassette.
Tiny bit better than 29. Not 32, but...

The Miche Primato cassette is 10 speed and Campagnolo
compatible. Its available in 13-30. Since your mechanic is
against IRD / Interloc Racing Design.

https://www.chainreactioncycles.com/us/en/campagnolo-centaur-10-speed-road-cassette/rp-prod89134?gs=1&sku=sku468398&pgrid=54137515364&pta id=pla-431322560060&utm_source=google&utm_term=&utm_campa ign=PLA+All+Products&utm_medium=base&utm_content=m kwid|sU6ivRhB2_dc|pcrid|253659801802|pkw||pmt||prd |468398US&gclid=EAIaIQobChMI6IiZxv-q4gIVg8DACh2rCA8LEAQYAyABEgIhLfD_BwE

https://www.probikekit.com/bicycle-c...E&gclsrc=aw.ds

https://www.chainreactioncycles.com/us/en/miche-primato-10-speed-cassette-campagnolo/rp-prod152804?gs=1&sku=sku556861&pgrid=54137515364&pt aid=pla-432746137323&utm_source=google&utm_term=&utm_campa ign=PLA+All+Products&utm_medium=base&utm_content=m kwid|sKz1DblpO_dc|pcrid|253659801802|pkw||pmt||prd |556861US&gclid=EAIaIQobChMIxNva3YGr4gIVDb7ACh3g7g T2EAQYASABEgKb_PD_BwE

Also should have stated that with Campagnolo, the left/front
Ergo shifter does not care about double or triple chainrings.
So its easy to just put on a triple crank if you need low
gears. I have my mountain climbing bike setup with Veloce 9
speed triple crank (74mm inner bcd so it has a 24 tooth inner
ring) and 13-28 cassette. 24x28 low gear is low enough for
unloaded mountain climbing.

Oh man thanks for that! I'll have to check the inner bcd on my
9-speed Veloce triple circa 2001 and see if I can put a 24 ring
on it. It'd sure beat the 30 that's on t here now.

I did something very similar on my coupled tandem with 700c
wheels. It came with Shimano components: chainrings of 53/39/30,
and a 10-speed cassette that was 11/13/15/17/19/22/25/28/32/36. To
accomodate that very large 36-tooth cog, it had a mountain bike
rear der (Shimano XTR) and the rear shifting was never entirely
satisfactory--I could only get it dialed in for about half the
cogs at a time.

I fixed it by going to a road bike rear der (shorter cage) that I
don't think was available at the time we bought the bike, a
narrower cassette range, and a complement of smaller chainrings.

Specifically, with the long throw Ultegra road derailer I used a
Shimano HG VIA HG500-10 (11-32) cassette, and a Powerglide
AL-7075-T6, 130 BCD, 50/39 chainring set with a 26 tooth small
ring. The resulting rear shifting was beautiful, and the front
shifting was fine (facilitated by use of a front Campy brifter and
its numerous positions)

As an aside, we initially experienced occasional severe chain
skipping when standing on the pedals. I eventually tracked it
down to a middle ring that was too small (a 38 tooth); confirmed
by observed wear spots on each end of the spider arms (an example
is he http://www.panix.com/~theise/spider.jpg).

This led me to conclude that the 38 tooth chainring was too small
(duh!) and the chain was not fully seating on the middle ring--and
therefore riding high on the teeth, and slipping when high power
was being applied. Indeed, when I put a new 39 tooth chainring on
the bike, the problem resolved.

I've been *very* happy with the shifting, and the combination of
gears works quite well for us. My only regret is not havig done
all this sooner!

--
Ted Heise West Lafayette, IN, USA