Shifting Dilemma
- Thread starter Bikeworks
- Start date
Steve Vai
Endurance Guy: Tolerates most of us.
(insert single-speed comment here)
JDurk
Well-Known Member
came here to say the same
Bikeworks
Well-Known Member
So, it's close. The derailleur was definitely part of the issue. I'm pretty sure the original that was sent was a 820, not 822 (despite being advertised as such). Also, the clutch added some tension which has actually helped in shifting to the lower gears. That said, it's just adequate. It's running a bit rough in the two highest, and shifting into the 51 is a challenge. I received the 10-45 cassette I ordered and am thinking I should just go with that and call it a day. Does everyone agree that it will likely be the thing that solves this for me?
Pic of where I am at. Happy with the overall build and aesthetic.
Pic of where I am at. Happy with the overall build and aesthetic.
Karate Monkey
Well-Known Member
Read the manual for setting chain length (si.shimano.com, search for RD-[whatever the model is], and open the dealer manual. It's critical for the proper operation of those derailleurs with offset pulleys.
You can put the b-screw in the right spot with the wrong length chain, and it just won't work right.
You can put the b-screw in the right spot with the wrong length chain, and it just won't work right.
Bikeworks
Well-Known Member
Got the chain at the correct length, B-screw is where it's supposed to be, even tried a few other positions, I still can't get it to shift clean through the entire stack. Thing is, if I install the smaller cassette, I'm stuck with it because it will be 'used' so I want to make the right call here.
GSTim
Formerly M3Tim
From that picture it looks like too much chain to me. In the lowest gear (largest cog) your derailleur should be almost to it's full travel forward. Can you take a picture with it in the largest cog?
Bikeworks
Well-Known Member
That pic was before the chain shortening. But your eye was right, it was too long.
Tentatively, it's working. I did some counterintuitive stuff with the cable/index setup. Namely, I tightened up the slack on the barrel adjuster by two turns as I was holding the cable set screw open, then I tightened it down. So in the stand it's good. Hopefully my days off line up with some decent weather next week and I can give it a test run. Thanks to all who helped!
serviceguy
Well-Known Member
According to Shimano tech sheets the RD-RX820 is supposed to be compatible only up to 36T, the 45T cassette may give you just marginal improvement. The correct derailleur is not that expensive.
https://bike.shimano.com/en-NA/products/components/pdp.P-RD-RX820.html
Bikeworks
Well-Known Member
Yea, I went ahead and got the 822. I thought I had it originally as that was what was advertised, but when I read the additional specs section on Amazon I saw that there was a conflicting description as an 820.
Got it on the road today, everything was working about as good as I would like, no issues to report. Just gotta dial in the fit now.