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Yikes! Di2
On Tuesday, December 24, 2019 at 8:11:25 AM UTC-8, Radey Shouman wrote:
Tom Kunich writes: On Friday, December 20, 2019 at 1:37:23 PM UTC-8, Radey Shouman wrote: Chalo writes: jbeattie wrote: https://tinyurl.com/wrk5fvk 20 clams. I'm not sure if the right has a friction option. I've gotten those for 8 and 9 speed bikes. Microshift makes some too, costlier but not obviously better. None of the new crop has a friction option, which is vexing when you could otherwise have anything from 7 to 11 gears on the same hub spacing. (Friction shifting 10 or 11 sounds awful if you know which gear you want. Maybe not so bad if you don't mind some randomness.) Now that almost all frames come with easy-to-replace, even-easier-to-bend derailleur hangers, having a manual override for indexing seems more important than it was back when we had it. Also, Shimano no longer want to commit to a single cable pull ratio for all their derailleurs (apparently for the sole purpose of making some parts of their product line incompatible with others). That's not really a problem for friction shifting. The natural development of shift-by-wire will be that the cable pull ratio will not even be the same for a single derailleur. Each gear change will have its own requirement for cable pull. Once the derailleurs have CANBus connectors, they'll be able to tell the shifters what they need ... That isn't the way it works. The stem unit simply orders a shift up or down. In each derailleur there is a micro-processor that could theoretically either set the spacing or even detect a misalignment and correct for it. This would be relatively easy with a simple audio or vibrational hookup. I see. Thanks for that. The "gear centering" adjustment is nothing more than the starting position of the rear derailleur. But since you want the lowest possible energy drain on the battery the easiest method is to use equal-distance spacing. It's not clear to me that equal spacing will always result in lowest battery drain. Irregular spacing requires a program that will search for the gear you're in and so the distance to the next gear up or down. Equally spaced it only has to move X steps. I found a CHEAP set of almost new Fulcrum wheels. They are actually tubeless as well if I decide to run them like that. But since I had a set of 25 mm Gatorskins I am running them as clinchers. The tires did mount quite a bit easier than tubeless tires do, so that is an advantage. The disadvantage is that you can't run good tires on California roads unless they're tubeless.. So, I mounted the new tires and moved the disks from the Campagnolo wheels which are only 10 speeds and since they have loose bearings in them I took them apart to see if I could change the Freehub and make them 11 speed. But nope and it was a real bear getting loose bearings back into a wheel. With the 11 speed wheels with new tires and disks mounted, I put them on the Redline. Then I went about mounting everything: Left and Right levers, Front and rear derailleurs. New shoes in the hydraulic brakes and mounted them. Stem electronic unit. That takes three hands so I had to have my wife loan me one of hers. I mounted the new under-BB electronic connector and finally mounted the external battery mount which goes on beneath the water bottle mount. So the only thing left to do is to install the hydraulic hoses to front and rear brakes and bleed them and to measure and order the wiring for the left and right lever to the stem unit, then stem h unit to the under BB connector and from there to the battery mount, and the front and rear derailleur. The battery and charger will be here in a couple of days. The set-up appears to be dead simple. Actually this is going to be a test platform since I intend to move everything over to a Trek setup if I like it. The setup I have is different from the latest Di2 and none of the front derailleur will only work with the stem unit if I understand people correctly. I would like to know if anyone has used the "single connector levers" and all the rest and if they had any real problems with them. |
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