On Tuesday, June 15, 2021 at 11:07:19 AM UTC-7, jbeattie wrote:
On Tuesday, June 15, 2021 at 10:30:00 AM UTC-7, wrote:
On Tuesday, June 15, 2021 at 5:37:08 PM UTC+2, Frank Krygowski wrote:
On 6/15/2021 10:42 AM, Tom Kunich wrote:
On Monday, June 14, 2021 at 7:08:25 PM UTC-7, Frank Krygowski wrote:
On 6/14/2021 3:12 PM, Tom Kunich wrote:
On Monday, June 14, 2021 at 8:55:36 AM UTC-7, jbeattie wrote:
Your limit screw should not have any effect on the shifting in the middle of the cassette. Your problems sound like cable tension or a bent derailleur hanger or worn cogs in the middle of your cassette. Whether your derailleur pulleys have bearings or bushings isn't going to make any difference, although worn teeth may affect shifting.
Where did I say anything at all about the limit screw having anything to do with anything but to keep a derailleur from overshifting? While out on a ride I overshifted the rear derailleur. I caught it before there was any damage to the wheel but I did not want to overshift again so I readjusted the rear derailleur tension so that it would not overshift. That unfortunately screwed up the shifting so I had to ride in gears that were not effected.
Don't tell me you wouldn't do the same thing if you didn't have a screwdriver of the proper size to reset the limit screw.
Despite your long history of mechanical mishaps, you really went on a
bike ride with no tool capable of adjusting a tiny screw?
Why?? To save weight??
There is a reason that I was successful and you were a nothing that did nothing - I had the sense to know that simply turning an adjustment screw would get me back 10 miles where I could properly adjust things. People like you stop and block roads until cars get tired of your stupid bull****..
No, people like me turn the proper screw and ride on.
It sounds like you messed with cable length adjustment, screwing up your
shifting, when you should have messed with the limit screw and left your
shift levers in synch with your cog spacing.
Again: You should consider keeping your mistakes secret. You continually
tell us about your incompetence.
--
- Frank Krygowski
Again limit screws have nothing to do with the adjustment of your RD. I once explained that to a friend with a simple drawing:
https://photos.app.goo.gl/xT6x8vfz4hRwx9Y9A
If the chain is jumping between gears than:
- RD is not adjusted right,
- bent RD hanger,
- upper pulley wheel has to much radial play causing hysteresis which makes adjustment near impossible,
- B screw adjustment way off,
- outer plate of a chain link displaced,
- wrong cassette,
- the overshift feature in the shifter is gummed up and doesn't back up fast enough. I have only experience with Campy 9 and 10 speed shifters with this. I don't know how it works in a 11 and 12 sp shifter.
Adjustment of the limit screws is not in this equation.
A RD in an indexed system should be a matter of 5 minutes.
As I understand it, he almost put his chain into the spokes shifting into the big cog. Rather than screwing-in his low gear limit screw (because he didn't have a pocket tool, apparently), he de-tensioned the cable, which (as one would expect) screwed up his shifting.
I think he tried to correct this at home, and it didn't work. It still shifted poorly. If he was putting his derailleur into the spokes, I wouldn't be surprised if he had a bent hanger.
Different bikes but what actually happened was that I installed an off-the-shelf rear derailleur and I expect I only set the lower limit. The upper limit screw was two full turns out of adjustment. Shifting EASY acted fine like Lou is trying to imply. But hitting a steep hill and having to shift pretty hard halfway up that 11%. It just pushed right over the large cog. Because the hill was so steep as soon as power came off the bike stopped. So no damage. But I assumed that the limit screw was just set a little off and loosened the cable a little. This worked fine except I would have to slightly overshift to get the middle gears to shift. And I was more careful to shift into low.
The bike that had the derailleur stop explode was the Douglas Vector and that did bend the hanger. But I bought a new one and got a new stop fitting for that derailleur. They sent me an aluminum fitting which was funny because ALL of the Campy 11 speed line use the steel fitting that is identical to the one that broke on my Centaur derailleur. That aluminum fitting looks like the Mirage fitting but they are not interchangeable. But all of the steel fittings are interchangeable.
In any case, the problem isn't quite fixed since I have to install one of the ball bearing idler pulley's so that it doesn't wobble and keep it from jumping a cog in ONE spot that is adjustable with the cable tension. The shifting problem is on the Eddy Merckx Elite which has a VERY heavy derailleur hanger instead of a replaceable one.