I think it's a LX. My principal idea is to get: 1. sufficient range on one ring for a given category of riding; example, stay on the big for all pavement riding.
2. Straight or straight-ish chain in most used gears. 3. As few overlaps as possible, all else equal. 4. All else equal, larger rings and cogs. Note that, from being a very particular shifter 15+ years ago, I now pretty much leave it in one gear or a very narrow range until I bog, then shift with big jumps. Looking more closely at the 38 or 36 X 24, I discover more problems; for example, to get # 2 in the outer would require an excessive collection of close smaller cogs leaving you too few for a good progression in the large cogs. (I realize that this is all very particular.) OTOH, while for most of my present riding, I can usually leave it in the 46 until sand, hills require some time in the 36 (again, I keep the 24 for the putatively possible loaded tour), the shifts between the mid 50s and lower gears require a chainring shift: again, so far, not a real issue, but theoretically the wide range 9 sp double would give me this range plus the higher on one ring. OTOH again, given the desire to put the cruising gears in the straight-chain position with the current triple, there is no point in adding additional cogs to the 7 now installed. Confession: I realized long ago that all of this is largely self-imposed idiosyncratics and that the easy solution is, "Shut-the-F-up-and-ride-the-damn'-bike!". But I do like to think about gearing. Upshot at this point: stick with the 3X7. Or go ss. On Sun, Apr 22, 2012 at 5:38 PM, Michael Hechmer <mhech...@gmail.com> 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 <mhech...@gmail.com>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/**i**ndex.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<https://groups.google.com/d/msg/rbw-owners-bunch/-/9mxwbdBI6z4J> >>> . >>> To post to this group, send email to >>> rbw-owners-bunch@googlegroups.**com<rbw-owners-bunch@googlegroups.com> >>> . >>> To unsubscribe from this group, send email to >>> rbw-owners-bunch+unsubscribe@**googlegroups.com<rbw-owners-bunch%2bunsubscr...@googlegroups.com> >>> . >>> For more options, visit this group at http://groups.google.com/** >>> group/rbw-owners-bunch?hl=en<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<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/-/Vd8Pf_UynQ8J. > > To post to this group, send email to rbw-owners-bunch@googlegroups.com. > To unsubscribe from this group, send email to > rbw-owners-bunch+unsubscr...@googlegroups.com. > 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 rbw-owners-bunch@googlegroups.com. To unsubscribe from this group, send email to rbw-owners-bunch+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en.
