Replacing cassette, RD adjustment necessary?
04-10-12, 07:20 PM
#1
Junior Member
Thread Starter
Join Date: May 2010
Location: A little north of Boston
Posts: 16
Bikes: 2011 Spec Roubaix Elite Apex, 2010 Jamis Coda Sport, 04 Trek 6000, 79 Peugeot UO10
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Replacing cassette, RD adjustment necessary?
Maybe an obvious question, but I searched and wasn't able to find an answer...
I've got an '11 Roubaix with a SRAM PG1050 (Apex) 11-32 cassette. I just ordered a 12-27 PG1070 (Rival/Force) cassette and the tools to change it with. Should I expect to have to adjust the RD or should things just line up the same?
I've got an '11 Roubaix with a SRAM PG1050 (Apex) 11-32 cassette. I just ordered a 12-27 PG1070 (Rival/Force) cassette and the tools to change it with. Should I expect to have to adjust the RD or should things just line up the same?
04-10-12, 07:51 PM
#2
Senior Member
Join Date: Jan 2012
Location: Ithaca, NY
Posts: 4,852
Bikes: Click on the #YOLO
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 26 Post(s)
Likes: 0
Liked 12 Times
in
12 Posts
If you have the tools, and, seemingly, the ability, why not just wait and see?
to answer your question though, no, you shouldn't expect to adjust.
to answer your question though, no, you shouldn't expect to adjust.
04-10-12, 07:58 PM
#3
Senior Member
Join Date: Aug 2005
Location: Pittsburgh, PA
Posts: 33,656
Bikes: '96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '20 Surly Midnight Special, All are 3x10. It is hilly around here!
Mentioned: 39 Post(s)
Tagged: 0 Thread(s)
Quoted: 2026 Post(s)
Likes: 0
Liked 1,095 Times
in
741 Posts
Not necessarily. I've run into several cases where installing the exact same configured cassette by the same manufacturer required minor adjusting of the limit screws and/or minor adjusting of the shift cable tension. There are manufacturing tolerances and it doesn't take much variability to make the shifting deteriorate. As IthaDan noted, wait and see but don't be surprised if you have to do a bit of tweaking.
04-10-12, 08:32 PM
#5
Senior Member
Join Date: Sep 2010
Location: Roswell, GA
Posts: 8,319
Bikes: '93 Trek 750, '92 Schwinn Crisscross, '93 Mongoose Alta
Mentioned: 30 Post(s)
Tagged: 0 Thread(s)
Quoted: 1438 Post(s)
Liked 1,092 Times
in
723 Posts
You might need to make a few touch-up adjustments due to manufacturing tolerances. You might also tweak the B-screw adjustment to bring the derailleur somewhat closer to the cassette which will aid shifting. Finally, if your chain was properly sized with the 32 tooth cassette it will now be somewhat long with the smaller 27 tooth cassette.
04-10-12, 08:59 PM
#6
Junior Member
Thread Starter
Join Date: May 2010
Location: A little north of Boston
Posts: 16
Bikes: 2011 Spec Roubaix Elite Apex, 2010 Jamis Coda Sport, 04 Trek 6000, 79 Peugeot UO10
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Thanks all. Pretty much what I expected to hear. Mostly was wondering if it would be easy to swap back and forth between both cassettes as needed. Sounds like a little tweak might be necessary which is no biggie.
Though it's usually the subtle adjustments that give me the most trouble
Though it's usually the subtle adjustments that give me the most trouble
04-11-12, 07:03 AM
#7
Senior Member
Join Date: Aug 2005
Location: Pittsburgh, PA
Posts: 33,656
Bikes: '96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '20 Surly Midnight Special, All are 3x10. It is hilly around here!
Mentioned: 39 Post(s)
Tagged: 0 Thread(s)
Quoted: 2026 Post(s)
Likes: 0
Liked 1,095 Times
in
741 Posts
Thanks all. Pretty much what I expected to hear. Mostly was wondering if it would be easy to swap back and forth between both cassettes as needed. Sounds like a little tweak might be necessary which is no biggie.
Though it's usually the subtle adjustments that give me the most trouble
Though it's usually the subtle adjustments that give me the most trouble
04-11-12, 07:14 AM
#8
Senior Member
Join Date: Jun 2003
Posts: 18,138
Bikes: 2 many
Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 1266 Post(s)
Liked 323 Times
in
169 Posts
You may not have to adjust it, but you need to check it every time you switch. One or both of the travel stops might need adjusting.
04-11-12, 07:16 AM
#9
Senior Member
Thanks all. Pretty much what I expected to hear. Mostly was wondering if it would be easy to swap back and forth between both cassettes as needed. Sounds like a little tweak might be necessary which is no biggie.
Though it's usually the subtle adjustments that give me the most trouble
Though it's usually the subtle adjustments that give me the most trouble
Brad
04-12-12, 11:03 PM
#10
Junior Member
Thread Starter
Join Date: May 2010
Location: A little north of Boston
Posts: 16
Bikes: 2011 Spec Roubaix Elite Apex, 2010 Jamis Coda Sport, 04 Trek 6000, 79 Peugeot UO10
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Follow-up question based on the mention of chain length... would it be any advantage to use a different chain with each cassette? That would at least keep the wear consistent on each chain/cassette pair, but the crank gears would still be wearing relative to overall mileage.
Sorry, I'm an engineer, so I tend to overthink things :-)
Sorry, I'm an engineer, so I tend to overthink things :-)
04-12-12, 11:22 PM
#11
Geck, wo ist mein Fahrrad
Join Date: Feb 2012
Location: Front Range
Posts: 715
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
if your RD is apex, if it's the long cage it might/should be able to handle the extra links.
would chain suck become an issue?
if you do go to two chains I'd suggest the wipperman connex link, or chains. very easy to remove.
would chain suck become an issue?
if you do go to two chains I'd suggest the wipperman connex link, or chains. very easy to remove.
Last edited by Rx Rider; 04-14-12 at 04:23 PM.
