Cassette and derailleur compatibility
#1
Senior Member
Thread Starter
Join Date: Oct 2009
Location: upstate NY
Posts: 161
Bikes: Jamis renegade, surly big dummy, giant talon 29er
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 62 Post(s)
Likes: 0
Liked 42 Times
in
22 Posts
Cassette and derailleur compatibility
I currently have a shimano 10 speed 11-34 cassette with a tiagra 4700 medium swing derailleur. I wanna switch to the shimano 10 speed 11-36 cassette. Shimano list the maximum sprocket for a 2x set up with that derailleur as a 34 sprocket. I know shimano is usually pretty conservative with there specs, so..... anyone have any experience with this? Or other general thoughts on of it will work?
#2
Expired Member
Join Date: Jun 2007
Location: TN
Posts: 11,508
Mentioned: 37 Post(s)
Tagged: 0 Thread(s)
Quoted: 3657 Post(s)
Liked 5,395 Times
in
2,739 Posts
No reason not to try it. I've used 32T on 10 speed RDs that were rated for 27 or 28(?). Several variables involved so there is no way to know until you try. Be sure to verify your chain is still long enough for large/large
Likes For shelbyfv:
#3
vespertine member
Join Date: Jul 2013
Location: Land of Angora, Turkey
Posts: 2,476
Bikes: Yes
Mentioned: 22 Post(s)
Tagged: 0 Thread(s)
Quoted: 687 Post(s)
Liked 220 Times
in
163 Posts
I agree - give it a go! I successfully used an 11-32 cassette with a 105/5800 derailleur rated for 28.
Definitely keep an eye on what happens when you cross chain (big-big). You don't want to cross chain anyway, and in my experience, accidentally doing it for a couple seconds was not catastrophic. One of my friends had a different outcome.
Definitely keep an eye on what happens when you cross chain (big-big). You don't want to cross chain anyway, and in my experience, accidentally doing it for a couple seconds was not catastrophic. One of my friends had a different outcome.
#4
Advocatus Diaboli
Join Date: Feb 2015
Location: Wherever I am
Posts: 8,631
Bikes: Merlin Cyrene, Nashbar steel CX
Mentioned: 14 Post(s)
Tagged: 1 Thread(s)
Quoted: 4729 Post(s)
Liked 1,531 Times
in
1,002 Posts
I get the 'give it a try' advice, but I suppose the OP would have to factor in whether he can return the cassette from wherever he purchased it and if there'd be an associated cost?
#5
Senior Member
Join Date: Mar 2006
Location: Chicago, IL, USA
Posts: 2,873
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 1455 Post(s)
Liked 1,477 Times
in
867 Posts
Here's a video of someone running a Tiagra RD-4700 GS with an 11-36T. No idea what front chainring size they're using, as this also plays a role.
I've heard of people using a longer B-screw to keep the pully off the cog when in the 36t cog.
I've heard of people using a longer B-screw to keep the pully off the cog when in the 36t cog.
#6
Senior Member
Join Date: Feb 2004
Location: St Peters, Missouri
Posts: 30,225
Bikes: Catrike 559 I own some others but they don't get ridden very much.
Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 1572 Post(s)
Liked 643 Times
in
364 Posts
My general philosophy is that, if I already own parts, I'll bolt most anything up and see if I can make it work. If I'm buying parts, I'll always buy components that are supposed to work together.
This is kind of a mixed situation. OP already owns the derailleur but wants to replace his cassette with one that offers an easier hill climb gear. Since it's only 2 teeth out of spec, I'd buy the cassette and try it in a heartbeat. I'm about than 80% confident a little B screw adjustment can make it work so it would be worth the risk to me.
How old is OP's chain? My philosophy is new cogs deserve a new chain. I might cheat on that if my existing chain was pretty new but I'd definitely check the chain length before reading the bike. With 2 additional teeth, you're about 50% needing a longer chain.
This is kind of a mixed situation. OP already owns the derailleur but wants to replace his cassette with one that offers an easier hill climb gear. Since it's only 2 teeth out of spec, I'd buy the cassette and try it in a heartbeat. I'm about than 80% confident a little B screw adjustment can make it work so it would be worth the risk to me.
How old is OP's chain? My philosophy is new cogs deserve a new chain. I might cheat on that if my existing chain was pretty new but I'd definitely check the chain length before reading the bike. With 2 additional teeth, you're about 50% needing a longer chain.
__________________
My greatest fear is all of my kids standing around my coffin and talking about "how sensible" dad was.
My greatest fear is all of my kids standing around my coffin and talking about "how sensible" dad was.
Likes For Retro Grouch:
#7
Senior Member
Join Date: Feb 2004
Location: St Peters, Missouri
Posts: 30,225
Bikes: Catrike 559 I own some others but they don't get ridden very much.
Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 1572 Post(s)
Liked 643 Times
in
364 Posts
You got away with it because your chain just happened to be long enough. The problem comes when your chain is too short. The derailleur arm is the weakest link in the system so it bends into the spokes and it will happen on your first strong pedal stroke. You wouldn't be shifting into the big rear cog if you weren't going uphill so your're going to be pedaling hard.
__________________
My greatest fear is all of my kids standing around my coffin and talking about "how sensible" dad was.
My greatest fear is all of my kids standing around my coffin and talking about "how sensible" dad was.
#8
SE Wis
Join Date: Apr 2005
Location: Milwaukee, WI
Posts: 10,503
Bikes: '68 Raleigh Sprite, '02 Raleigh C500, '84 Raleigh Gran Prix, '91 Trek 400, 2013 Novara Randonee, 1990 Trek 970
Mentioned: 40 Post(s)
Tagged: 0 Thread(s)
Quoted: 2742 Post(s)
Liked 3,390 Times
in
2,053 Posts
Be careful of what cassette you use. Tiagra 4700, while a 10 speed group, uses the Shimano 11 speed pull ratio on the rear derailleur.
#9
Senior Member
Join Date: Oct 2009
Location: Sherwood, OR
Posts: 1,279
Mentioned: 29 Post(s)
Tagged: 0 Thread(s)
Quoted: 336 Post(s)
Liked 309 Times
in
180 Posts
I would use a 9 speed mountain RD. It easily clears a 36T cassette, and provides a ton of chain wrap for a 2x setup.
I am running 10 speed ultegra brifters with 10 speed 11-36 cassettes and 9 speed XT RD. The combo works flawlessly, because the 9 speed mountain, 9 speed road, and 10 speed road derailleurs all move the amount with the same amount of cable pull. 10 speed mountain is not compatible.
I am running 10 speed ultegra brifters with 10 speed 11-36 cassettes and 9 speed XT RD. The combo works flawlessly, because the 9 speed mountain, 9 speed road, and 10 speed road derailleurs all move the amount with the same amount of cable pull. 10 speed mountain is not compatible.
#10
Expired Member
Join Date: Jun 2007
Location: TN
Posts: 11,508
Mentioned: 37 Post(s)
Tagged: 0 Thread(s)
Quoted: 3657 Post(s)
Liked 5,395 Times
in
2,739 Posts
Unfortunately his 4700 shifters aren't compatible with the 9 speed mtb rear derailleurs. Another good solution lost to progress
#11
Senior Member
Thread Starter
Join Date: Oct 2009
Location: upstate NY
Posts: 161
Bikes: Jamis renegade, surly big dummy, giant talon 29er
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 62 Post(s)
Likes: 0
Liked 42 Times
in
22 Posts
I'm thinking I'll be ok with the derailleur combo. Chain is original to the 50-34 front crankset. I'm running a 46-30 now. Would that make up for the larger sprocket and allow the same chain? Not opposed to buying a new chain but it's a relatively new bike about 500 miles on it. Dont like to through money away.
#12
Hack
Join Date: Sep 2015
Location: Ottawa, Ontario, Canada
Posts: 1,261
Bikes: TrueNorth CX bike, 88 Bianchi Strada (currently Sturmey'd), 90's Giant Innova (now with drop bars), Yess World Cup race BMX, Redline Proline Pro24 race BMX Cruiser
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 345 Post(s)
Liked 186 Times
in
130 Posts
Likes For Viich:
#13
Senior Member
Join Date: Feb 2004
Location: St Peters, Missouri
Posts: 30,225
Bikes: Catrike 559 I own some others but they don't get ridden very much.
Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 1572 Post(s)
Liked 643 Times
in
364 Posts
I'm thinking I'll be ok with the derailleur combo. Chain is original to the 50-34 front crankset. I'm running a 46-30 now. Would that make up for the larger sprocket and allow the same chain? Not opposed to buying a new chain but it's a relatively new bike about 500 miles on it. Dont like to through money away.
__________________
My greatest fear is all of my kids standing around my coffin and talking about "how sensible" dad was.
My greatest fear is all of my kids standing around my coffin and talking about "how sensible" dad was.
Likes For Retro Grouch:
#14
Senior Member
Join Date: Jun 2014
Location: Ontario, Canada
Posts: 4,624
Bikes: iele Latina, Miele Suprema, Miele Uno LS, Miele Miele Beta, MMTB, Bianchi Model Unknown, Fiori Venezia, Fiori Napoli, VeloSport Adamas AX
Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 1324 Post(s)
Liked 927 Times
in
640 Posts
Here's a video of someone running a Tiagra RD-4700 GS with an 11-36T. No idea what front chainring size they're using, as this also plays a role.
I've heard of people using a longer B-screw to keep the pully off the cog when in the 36t cog.
https://youtu.be/4s_N9CUGXAw
I've heard of people using a longer B-screw to keep the pully off the cog when in the 36t cog.
https://youtu.be/4s_N9CUGXAw
Cheers
Likes For Miele Man:
#15
Senior Member
Join Date: Dec 2015
Location: Brentwood WLA
Posts: 326
Bikes: 50/34, 11-40, 11 Speed
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 142 Post(s)
Liked 73 Times
in
52 Posts
I currently have a shimano 10 speed 11-34 cassette with a tiagra 4700 medium swing derailleur. I wanna switch to the shimano 10 speed 11-36 cassette. Shimano list the maximum sprocket for a 2x set up with that derailleur as a 34 sprocket. I know shimano is usually pretty conservative with there specs, so..... anyone have any experience with this? Or other general thoughts on of it will work?
#16
Senior Member
Join Date: Jan 2011
Posts: 2,977
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 1638 Post(s)
Liked 741 Times
in
495 Posts
X2.
When I take my road bike to the mountains I swap the cassette (and chain) for a 12-36 and use a Wolf Tooth Roadlink.
__________________
nine mile skid on a ten mile ride
nine mile skid on a ten mile ride
#17
Cycleway town
Derailleur drop links are fine for up to about 7-speed with certain aggressive chains, but not so good with 10-speed in my experience.
The problem is that the jockey wheel is so far from the cassette, the chain cross isn't aggressive enough for the next gear to take it. So indexing is ineffective and you find yourself having to go two clicks to engage, and then click back as soon as it bites..
The problem is that the jockey wheel is so far from the cassette, the chain cross isn't aggressive enough for the next gear to take it. So indexing is ineffective and you find yourself having to go two clicks to engage, and then click back as soon as it bites..
#18
Member
Join Date: Jul 2017
Posts: 36
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 20 Post(s)
Likes: 0
Liked 2 Times
in
2 Posts
I currently run a 34t granny on a derailleur rated for 28t max.
How often do you use your granny gear?
It will definitely work but will make some noise and not be as smooth.
How often do you use your granny gear?
It will definitely work but will make some noise and not be as smooth.