Compatable Upgrade RD Question for my 7 speed Shimano set-up Road bike
#1
Senior Member
Thread Starter
Join Date: Oct 2007
Location: Riverdale, NY
Posts: 761
Bikes: 2002 Seven Axiom
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 11 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Compatable Upgrade RD Question for my 7 speed Shimano set-up Road bike
Hi all
I have a 7 speed Exage RD that I would like to swap out .
Most likely I will stay with the 7 speed set-up, maybe put on a 8-9 comaptable down the road if it fits.
Questions:
Can I use a 8-9 Shimano RD such as a 105 or ultegra back there with the current 7 set-up?
Could I use a triple 8-9 RD even if I have a double in the front? My reason is that I may want to through a LARGE
cassette in the back one day.
Thanks
I have a 7 speed Exage RD that I would like to swap out .
Most likely I will stay with the 7 speed set-up, maybe put on a 8-9 comaptable down the road if it fits.
Questions:
Can I use a 8-9 Shimano RD such as a 105 or ultegra back there with the current 7 set-up?
Could I use a triple 8-9 RD even if I have a double in the front? My reason is that I may want to through a LARGE
cassette in the back one day.
Thanks
#2
Elitist Troglodyte
Join Date: Jun 2006
Location: Dallas
Posts: 6,925
Bikes: 03 Raleigh Professional (steel)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
You will need a mountain bike RD with a large (I presume you mean something like a 14-34) cassette. Just about any one will do. 105 and Ultegra are road RDs and won't handle cogs that big.
__________________
Stupidity got us into this mess - why can't it get us out?
- Will Rogers
Stupidity got us into this mess - why can't it get us out?
- Will Rogers
#3
Senior Member
Thread Starter
Join Date: Oct 2007
Location: Riverdale, NY
Posts: 761
Bikes: 2002 Seven Axiom
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 11 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
My most important question is what will work on my 7 speed which in anycase is at a 11-23 now
#4
Senior Member
If you are talking about friction shifting then yes, a long cage RD will work for you. If you are talking indexing then chances are good it won't work, or it won't work well, so if you want to keep the indexing I would vote to wait until you can replace everything at once with the group you want. In the case of friction, replace what you want to you hearts content.
I am currently running the following on:
Campagnolo Veloce front triple (30,42,52)
Campagnolo Record Triple FD
Campagnolo Centaur RD mid-cage
Campagnolo friction downtube shifters
Sunrace 7 speed - 13,15,16,18,20,22,24
SRAM PC870 Chain
I am currently running the following on:
Campagnolo Veloce front triple (30,42,52)
Campagnolo Record Triple FD
Campagnolo Centaur RD mid-cage
Campagnolo friction downtube shifters
Sunrace 7 speed - 13,15,16,18,20,22,24
SRAM PC870 Chain
Last edited by canopus; 12-18-09 at 12:13 PM. Reason: added info
#5
Elitist Troglodyte
Join Date: Jun 2006
Location: Dallas
Posts: 6,925
Bikes: 03 Raleigh Professional (steel)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
Cage length has nothing to do with the size cog a RD will handle. Cog capacity is constrained by the parallelogram geometry; the cage constrains only chain wrap capacity. Shimano road RDs - of any cage length - are spec'd to handle up to 27T, but will generally handle up to 30T.
Any RD will handle 7-speed 11-23. So what's wrong with your Exage?
__________________
Stupidity got us into this mess - why can't it get us out?
- Will Rogers
Stupidity got us into this mess - why can't it get us out?
- Will Rogers
Last edited by DMF; 12-18-09 at 12:17 PM. Reason: speling
#6
cycles per second
Join Date: Oct 2003
Location: Minnesota
Posts: 1,930
Bikes: Early 1980's Ishiwata 022 steel sport/touring, 1986 Vitus 979, 1988 DiamondBack Apex, 1997 Softride PowerWing 700, 2001 Trek OCLV 110
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 44 Post(s)
Liked 71 Times
in
48 Posts
If you want to go with a cassette larger than a 30, go with an MTB rear derailer. Road derailers are rated for only 27 or 28 (but they can often be coaxed to run OK on a 30). Earlier this year I put a Shimano Deore RD-M510 MTB "9-speed" rear derailer on my commuting/touring bike and I run 7-speed on that rig. It's been working great and it was only $22.
Some Shimano MTB rear derailers are low-normal (Shimano calls them RapidRise). I've read they are supposed to shift better but I've never tried one. I think the Deore LX RD-M580 is low-normal.
Some Shimano MTB rear derailers are low-normal (Shimano calls them RapidRise). I've read they are supposed to shift better but I've never tried one. I think the Deore LX RD-M580 is low-normal.
Last edited by Gonzo Bob; 12-18-09 at 12:57 PM.
#7
Senior Member
Thread Starter
Join Date: Oct 2007
Location: Riverdale, NY
Posts: 761
Bikes: 2002 Seven Axiom
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 11 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
You are wrong (and so is canopus).
Cage length has nothing to do with the size cog a RD will handle. Cog capacity is constrained by the parallelogram geometry; the cage constrains only chain wrap capacity. Shimano road RDs - of any cage length - are spec'd to handle up to 27T, but will generally handle up to 30T.
Any RD will handle 7-speed 11-23. So what's wrong with your Exage?
Cage length has nothing to do with the size cog a RD will handle. Cog capacity is constrained by the parallelogram geometry; the cage constrains only chain wrap capacity. Shimano road RDs - of any cage length - are spec'd to handle up to 27T, but will generally handle up to 30T.
Any RD will handle 7-speed 11-23. So what's wrong with your Exage?
#8
Elitist Troglodyte
Join Date: Jun 2006
Location: Dallas
Posts: 6,925
Bikes: 03 Raleigh Professional (steel)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
Jockey wheels are easily replaced and inexpensive. I'm not sure what parts the Exage xxxx requires, but someone here probably does...
__________________
Stupidity got us into this mess - why can't it get us out?
- Will Rogers
Stupidity got us into this mess - why can't it get us out?
- Will Rogers
#9
Senior Member
Thread Starter
Join Date: Oct 2007
Location: Riverdale, NY
Posts: 761
Bikes: 2002 Seven Axiom
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 11 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Sometimes I have found great RD deals online that it paid to it versus new wheels.
#10
Senior Member
Put a 105 long cage in case you go for a triple. It will handle a 30t cog. Go for an LX if you think you will go as large as a 34t cog.
If you want to replace the jockey wheels go to The Third Hand Loose Screws and get the Ultegra 8sp's and they will work.
If you want to replace the jockey wheels go to The Third Hand Loose Screws and get the Ultegra 8sp's and they will work.
#11
Senior Member
Thread Starter
Join Date: Oct 2007
Location: Riverdale, NY
Posts: 761
Bikes: 2002 Seven Axiom
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 11 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Thanks all
Thread
Thread Starter
Forum
Replies
Last Post
sjt78
Bicycle Mechanics
23
04-27-11 08:34 AM