Can't answer for Michael, but in my experience I get better shifting performance on a compact crankset with a standard (Chorus, I think) front derailleur than with a Campy derailleur designed for compact cranks. Go figure.
Ditto for my PBP bike, which has a Velo Orange compact crankset (48T big ring) and a old Campy Nuovo Record derailleur mounted to a braze-on fitting ... with the result that there is a *ton* of clearance between the cage and the ring (about a half inch, and I can't move the derailleur any lower because of the braze-on). It shouldn't shift, but it does ... flawlessly. --Eric N On Apr 22, 2012, at 5:40 PM, BCDrums <[email protected]> wrote: > Michael, > > Which Campy front derailleur are you using? > > BC > > On Apr 22, 7:38 pm, Michael Hechmer <[email protected]> wrote: >> What FD are you using? I certainly appreciate your desire to minimize >> front shifts. I switched back to a 44/30 double with the expectation I >> could reduce them, and I certainly have. But I also found that my 105 >> derailler wouldn't work across such a small front and so switched to the >> Campy, and as a result got such excellent front shifting that I no longer >> give it much thought. Instead I pay more attention to front shifts in the >> middle of the cassettes and having a nice straight chain line. I have >> also found that having a difference of 10 teeth is optimal, because it >> produces a simple shifting pattern - after shifting rings I am always one >> cog from the next gear. But this combo lacks range and so only really >> works well in a triple. Experimentation has taught me that a difference of >> twelve leaves me between gears and sixteen not only creates a very slow >> upshift but also requires searching for the next gear in the back. A >> difference of 14 seems to be a nice compromise, with a decent front shift >> and two clicks in the back to the next gear. Often, in rolling terrain, >> that front shift gives me exactly the gear I want. >> >> Michael >> >> >> >> >> >> >> >> On Sunday, April 22, 2012 12:41:48 PM UTC-4, Patrick Moore wrote: >> >>> Thanks, Michael -- more questions below. >> >>> I should have been clearer that all of this rigmarole and these questions >>> are premised on the desire to shift between rings as little as possible. >>> Obviously, swapping out the 46/36/24 triple to a, say, 38/24 double would >>> help greatly, but OTOH, the current triple has its own advantages, not the >>> least of which it is already in place. The the question about using as many >>> cogs as possible with the 46 and the 36. >> >>> On Sat, Apr 21, 2012 at 8:39 PM, Michael Hechmer <[email protected]>wrote: >> >>>> On Saturday, April 21, 2012 9:28:47 PM UTC-4, Patrick Moore wrote: >> >>>>> 1. Is there any harm in riding the 46 up to cog #7? Note that this hub >>>>> is an 8/9 speed hub with extra spacers behind the big cogs. There is >>>>> plenty >>>>> of chain and the derailleur cage is just for'ard of vertical when in the >>>>> big cog -- ie, nothing is really stretched -- I deliberately added extra >>>>> slack for this. >> >>>>> Not such a good idea, since the chain angle increases friction and wear >>>> on the chain, rings and cogs. Besides, If you drop from the 46x22 down to >>>> the 36 you will get the next gear, a better gear spacing, and a straighter >>>> chain line all the way down to 31. >> >>> Is this because of the inward position of #7, or because of its size? Note >>> again that the 34 (or the 29) is in effect the third ring from the inside >>> since I installed only 7 cogs out of a possible 9. Once again, there is >>> plenty of chain slack. Second opinion, then, about the 46/34? >> >>>> 2. Can I use the 36 with cog #1? >> >>>>> Why not? It will work OK, but if you're going to be there for a long >>>> time, the 46x20 will be a little better. >> >>> Good to know. Most of my dirt riding is in our river valley bosque which >>> is pancake flat except for the occasional steep, short grunt up onto a >>> levee, so the 46 provides ample range (this is the context for that "46/34" >>> question). But if I ride in dirt in hillier terrain -- say in Rio Rancho's >>> sand hills and in the east mountain foothills -- the range on the 36 will >>> be very desirable. >> >>>>> BIG APPLES KOJAKS *46* 36 24 *46* 36 24 16 83 65 15 83 65 18 74 >>>>> 58 17 73 57 *20* *67* 52 *18* *69* 54 22 61 47 32 19 65 51 34 26 51 >>>>> 40 27 21 59 46 31 30 44 35 23 24 52 41 27 34 39 31 20 29 43 34 22 >>>>> I am still debating whether one of these has any real advantage for me: >> >>>>> 36 24 38 24 11 88 12 92 12 81 13 85 13 75 14 79 14 69 16 >>>>> 69 16 61 17 65 19 51 34 20 55 35 23 44 28 24 46 29 29 35 23 28 >>>>> 39 25 34 30 20 36 31 19 >> >>>> The 12 will last longer than the 11 and you have more useful gears off >>>> the 24 than you are showing. You will need a short cage FD, like the >>>> campy, to make this work without running the derailler into the chain stay, >>>> and still be close enough to a 38 to shift smoothly. >> >>> If I do switch to a double, it will very likely be with a 38 and a small >>> cog of 12. I'll have to play with the current (LX?) fd. For one thing, the >>> whole point of this exercise is to decrease fd shifting; second, I intend >>> to install a bash guard in the outer position; and third, I rarely use the >>> granny in the conditions I ride in: the hills are short enough that I stand >>> and grunt or, if sand is involved on hill or flat and I can't power through >>> it in a 50- or 60- something gear, it is usually too deep to allow shifting >>> into the granny: by the time I manage the shift, I've bogged and fall over. >>> (So to speak.) Also, I am sure I will be grateful for it if I ever tour. >> >>> Fun stuff, this gearing nonsense! If I bore y'all with it, enter a >>> subscription to collect enough to buy me a nice ss 29er. >> >>>>> Don't wait up for me: I have been a gear nerd, freak, obsessive, fanatic >>>>> for over 20 years despite fixed gear riding and I love the subject. Frank >>>>> Berto has nothing on me. >> >>>>> Patrick Moore, who does actually ride his bikes and just had a >>>>> wonderfully pleasant and fast 20 mile dirt ride (flat) on the Fargo in the >>>>> 46X20. >>>>> -- >> >>>>> ------------------------- >>>>> Patrick Moore, Albuquerque, NM >>>>> For professional resumes, contact Patrick Moore, ACRW >>>>> http://resumespecialties.com/**index.html<http://resumespecialties.com/index.html> >>>>> ------------------------- >> >>>>> A billion stars go spinning through the night >>>>> Blazing high above your head; >>>>> But in you is the Presence that will be >>>>> When all the stars are dead. >> >>>>> Ranier Maria Rilke, Buddha in Glory >> >>>> -- >>>> You received this message because you are subscribed to the Google Groups >>>> "RBW Owners Bunch" group. >>>> To view this discussion on the web visit >>>> https://groups.google.com/d/msg/rbw-owners-bunch/-/9mxwbdBI6z4J. >>>> To post to this group, send email to [email protected]. >>>> To unsubscribe from this group, send email to >>>> [email protected]. >>>> For more options, visit this group at >>>> http://groups.google.com/group/rbw-owners-bunch?hl=en. >> >>> -- >> >>> ------------------------- >>> Patrick Moore, Albuquerque, NM >>> For professional resumes, contact Patrick Moore, ACRW >>> http://resumespecialties.com/index.html >>> ------------------------- >> >>> A billion stars go spinning through the night >>> Blazing high above your head; >>> But in you is the Presence that will be >>> When all the stars are dead. >> >>> Ranier Maria Rilke, Buddha in Glory > > -- > You received this message because you are subscribed to the Google Groups > "RBW Owners Bunch" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/rbw-owners-bunch?hl=en. > -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en.
