Andy Cheatham claimed: " Low normal of Rapid Rise springing has the top jockey wheel physically pushing the chain against a larger cog at the beginning of any downshift until cadence and conditions permitted the chain to start transferring from one cog to the next"
This is a description of a rear derailer set up incorrectly. This is not a description of the fundamental properties of a Rapid Rise rear derailer. The upper jockey wheel on a correctly set up rear derailer does not operate in this way, regardless of which polarity the rear derailer is. There are plenty of reasons to decide that one doesn't like Rapid Rise, but the above was "a bum one". It was a bum setup. Bill Lindsay El Cerrito, CA On Tuesday, July 13, 2021 at 1:50:48 PM UTC-7 ascpgh wrote: > Sam, I am guessing that the derailleur is always tensioned toward the next > larger size cog if shifted, whether or not the drive train is turning > enough to initiate a physical change of cogs. > > Shifting before indexing imprinted me with a pause of cadence at the time > of a shift to easing chain tension allowing the chain over the teeth of one > cog to to get over to the next. Low normal of Rapid Rise springing has the > top jockey wheel physically pushing the chain against a larger cog at the > beginning of any downshift until cadence and conditions permitted the chain > to start transferring from one cog to the next. At every moment that > cadence or tension is preventing a shift from happening, the top wheel is > subjected to non productive lateral force as it presses the next larger cog > with the chain. > > Maybe it was that or maybe I just had a bum one. > > The mentioned difficulty of wheel removal "in event of a broken cable" is > because the derailleur take the chain to largest cog instead of the > smallest, taking away necessary slack to get the maneuver the cassette and > wheel out of or back into the dropouts and chain. I'd fix the cable first, > even if the wheel is in need of service, just to make it less of a fight. > > Fixed my broken pulley with a set of Bullseye jockey wheels but the Rapid > Rise low normal could not fixed from the aftermarket. Changed to a high > normal since it continued to feel odd to me. Like a bucket truck that > needed hydraulic power to lower the bucket to the ground, it just felt > wrong to me so I reverted to the traditional. > > Andy Cheatham > Pittsburgh > > > > On Tuesday, July 13, 2021 at 10:10:17 AM UTC-5 Sam Perez wrote: > >> Hi Andy , >> Wonder why the wheel wore out so quickly. Feedback so far seems to be >> consistent with my internet findings. But I’m getting great perspective. >> >> Sent from my iPhone >> >> On Jul 13, 2021, at 7:27 AM, ascpgh <asc...@gmail.com> wrote: >> >> I tried the Deore level RR RD on my commuter after hearing all the >> platitudes. Meh. That was about it for me. >> >> >> Always shifted wrong on first grab of the bar end shifter, muscle memory >> is like Sharpie writing in this case. I probably would adapt easier to >> switching sides of controls for both brakes and derailleurs before I >> normalized the intuitive presumption of which way on the shifter. It was >> the first derailleur I ever used that wore out the upper jockey wheel >> bearing to 15-20° play/lean to either side. All speculation excepthat it >> was a Rapid Rise format and it's upper wheel failed with remarkably low >> miles. Confusing, short life span? You know how I've voted. >> >> Andy Cheatham >> Pittsburgh >> >> On Tuesday, July 13, 2021 at 12:47:08 AM UTC-5 Joe Bernard wrote: >> >>> I had one for a short while and found it finicky to install and >>> counterintuitive to shift. I'm sure both of these reactions are based on >>> decades of high-normal derailers, I think RapidRise is probably better for >>> new riders who've never messed with the other way. >>> >>> >>> >>> On Monday, July 12, 2021 at 10:08:30 PM UTC-7 Sam Perez wrote: >>> >>>> Hey guys, >>>> Why is there so little info on rapid rise RD and why is it so >>>> polarizing. Sources include bike snob grants blog and random internet >>>> sources. Takeaways were finicky and needing frequent adjustment but also >>>> great concept and easy down shifting. Any experience thoughts insights? >>>> >>>> Thanks >>> >>> -- >> >> You received this message because you are subscribed to the Google Groups >> "RBW Owners Bunch" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to rbw-owners-bun...@googlegroups.com. >> >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/rbw-owners-bunch/396234e3-9abd-4ac6-895f-556622f6226en%40googlegroups.com >> >> <https://groups.google.com/d/msgid/rbw-owners-bunch/396234e3-9abd-4ac6-895f-556622f6226en%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> >> -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/rbw-owners-bunch/f2ea5099-39db-474d-b1e9-838a32325ab4n%40googlegroups.com.
