Go Back  Bike Forums > Bike Forums > Bicycle Mechanics
Reload this Page >

Converting a Shimano 5603 from triple to double

Notices
Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

Converting a Shimano 5603 from triple to double

Old 03-24-18, 09:11 AM
  #1  
Have bike, will travel
Thread Starter
 
Barrettscv's Avatar
 
Join Date: Feb 2006
Location: Lake Geneva, WI
Posts: 12,392

Bikes: Ridley Helium SLX, Canyon Endurance SL, De Rosa Professional, Eddy Merckx Corsa Extra, Schwinn Paramount (1 painted, 1 chrome), Peugeot PX10, Serotta Nova X, Simoncini Cyclocross Special, Raleigh Roker, Pedal Force CG2 and CX2

Mentioned: 46 Post(s)
Tagged: 0 Thread(s)
Quoted: 910 Post(s)
Liked 286 Times in 157 Posts
Converting a Shimano 5603 from triple to double

I'm considering installing a double crankset and derailleur on a bike with Shimano 105 5603 STI brifters. The bike currently has a 105 triple crankset.

Will the triple 5603 STI brifters play well with a double front derailleur?
__________________
When I ride my bike I feel free and happy and strong. I'm liberated from the usual nonsense of day to day life. Solid, dependable, silent, my bike is my horse, my fighter jet, my island, my friend. Together we will conquer that hill and thereafter the world.
Barrettscv is offline  
Old 03-24-18, 10:30 AM
  #2  
aka: Dr. Cannondale
 
rccardr's Avatar
 
Join Date: Jul 2009
Posts: 7,742
Mentioned: 228 Post(s)
Tagged: 0 Thread(s)
Quoted: 2100 Post(s)
Liked 3,202 Times in 1,136 Posts
Yes, it should work fine if you set it up to use the small and middle ring settings, locking out the big ring with the limiting screw.
__________________
Hard at work in the Secret Underground Laboratory...
rccardr is offline  
Old 03-24-18, 10:42 AM
  #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: 2025 Post(s)
Likes: 0
Liked 1,089 Times in 736 Posts
Originally Posted by rccardr
Yes, it should work fine if you set it up to use the small and middle ring settings, locking out the big ring with the limiting screw.
That's not what you want to do. Set the shifter up to use the middle and big chainring position and lockout the granny ring position with the low limit screw. That way if you forget and overshift to the non-existent granny position the only consequence is a slack cable.

If you lockout the big ring position, trying to overshift can break the shifter internals.
HillRider is offline  
Old 03-24-18, 02:37 PM
  #4  
Senior Member
 
Kontact's Avatar
 
Join Date: Apr 2011
Posts: 6,082
Mentioned: 41 Post(s)
Tagged: 0 Thread(s)
Quoted: 3723 Post(s)
Liked 1,047 Times in 697 Posts
Originally Posted by HillRider
That's not what you want to do. Set the shifter up to use the middle and big chainring position and lockout the granny ring position with the low limit screw. That way if you forget and overshift to the non-existent granny position the only consequence is a slack cable.

If you lockout the big ring position, trying to overshift can break the shifter internals.
Is this something you got from a manual?


Every time you shift into the big ring you are essentially overshifting against the shifter internals and the H stop. What's different when you do it from the middle ring position of the shifter?

Most shifters sold as 2 or 3 have you start in the lowest gear. Having the shift cable hanging slack from an accidental downshift is going to create problems with the housing getting stuck.
Kontact is offline  
Old 03-24-18, 03:04 PM
  #5  
afraid of whales
 
Mr IGH's Avatar
 
Join Date: Apr 2009
Location: Front Range, CO
Posts: 4,306
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 347 Post(s)
Likes: 0
Liked 5 Times in 5 Posts
Originally Posted by HillRider
...Set the shifter up to use the middle and big chainring position and lockout the granny ring position with the low limit screw....
Yup, that's how I've done it on several bikes. This is the right way to do it if you don't want to break your shifter. LOL on the slack cable being a danger, gotta love the internet OSHA inspectors
Mr IGH is offline  
Old 03-24-18, 03:17 PM
  #6  
Senior Member
 
Kontact's Avatar
 
Join Date: Apr 2011
Posts: 6,082
Mentioned: 41 Post(s)
Tagged: 0 Thread(s)
Quoted: 3723 Post(s)
Liked 1,047 Times in 697 Posts
Originally Posted by Mr IGH
Yup, that's how I've done it on several bikes. This is the right way to do it if you don't want to break your shifter. LOL on the slack cable being a danger, gotta love the internet OSHA inspectors
You're comparing the "danger" of breaking a shifter by using it the way it was designed vs. the "danger" of getting the housing stuck half out of stop.


Seems like both are at about the same level of concern.
Kontact is offline  
Old 03-24-18, 04:56 PM
  #7  
Expired Member
 
shelbyfv's Avatar
 
Join Date: Jun 2007
Location: TN
Posts: 11,339
Mentioned: 37 Post(s)
Tagged: 0 Thread(s)
Quoted: 3584 Post(s)
Liked 5,186 Times in 2,631 Posts
I have a couple of bikes that use 6603 shifters with a double crank and FD, works well. IIRC, Shimano advised using the middle and large settings but that didn't work well for me and I ended up using small and middle. It would take a really good shove to force the shifter into the large ring position against the limit screw. Have to be pretty ham fisted, IMO. May as well try it the "correct" way but don't hesitate to use small and middle if you need to.
shelbyfv is offline  
Old 03-24-18, 06:29 PM
  #8  
aka: Dr. Cannondale
 
rccardr's Avatar
 
Join Date: Jul 2009
Posts: 7,742
Mentioned: 228 Post(s)
Tagged: 0 Thread(s)
Quoted: 2100 Post(s)
Liked 3,202 Times in 1,136 Posts
<<shrugs shoulders>>
I've done it that way a bunch (small and inner ring settings) and never had a problem. If you're going to overshift while already in the big ring, well, you're going to do something you're not supposed to do anyway... breakage is breakage regardless.

But no reason you can't set it up with big/middle settings, should work fine, same pull done either way.
__________________
Hard at work in the Secret Underground Laboratory...
rccardr is offline  
Old 03-24-18, 06:47 PM
  #9  
Senior Member
 
Join Date: Jul 2007
Location: South shore, L.I., NY
Posts: 6,563

Bikes: Flyxii FR322, Cannondale Topstone, Miyata City Liner, Specialized Chisel, Specialized Epic Evo

Mentioned: 18 Post(s)
Tagged: 0 Thread(s)
Quoted: 3041 Post(s)
Liked 1,804 Times in 1,035 Posts
Obviously the OP hasn’t gotten the news that triples AND doubles are out, 1X is in.

So scrap the whole concept, lockout the small AND big ring, and get an 11-40 something cassette.

Apparantly front shifting currenly sucks and is getting worse by the minute.
Steve B. is offline  
Old 03-25-18, 06:25 AM
  #10  
Have bike, will travel
Thread Starter
 
Barrettscv's Avatar
 
Join Date: Feb 2006
Location: Lake Geneva, WI
Posts: 12,392

Bikes: Ridley Helium SLX, Canyon Endurance SL, De Rosa Professional, Eddy Merckx Corsa Extra, Schwinn Paramount (1 painted, 1 chrome), Peugeot PX10, Serotta Nova X, Simoncini Cyclocross Special, Raleigh Roker, Pedal Force CG2 and CX2

Mentioned: 46 Post(s)
Tagged: 0 Thread(s)
Quoted: 910 Post(s)
Liked 286 Times in 157 Posts
Originally Posted by Steve B.
Obviously the OP hasnít gotten the news that triples AND doubles are out, 1X is in.

So scrap the whole concept, lockout the small AND big ring, and get an 11-40 something cassette.

Apparantly front shifting currenly sucks and is getting worse by the minute.
Poor attempt at humor.
__________________
When I ride my bike I feel free and happy and strong. I'm liberated from the usual nonsense of day to day life. Solid, dependable, silent, my bike is my horse, my fighter jet, my island, my friend. Together we will conquer that hill and thereafter the world.
Barrettscv is offline  
Old 03-25-18, 07:00 AM
  #11  
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: 2025 Post(s)
Likes: 0
Liked 1,089 Times in 736 Posts
Originally Posted by Kontact
Is this something you got from a manual?
As a matter of fact, yes. A manual from some incompetent source named Shimano.

Originally Posted by Kontact
Having the shift cable hanging slack from an accidental downshift is going to create problems with the housing getting stuck.
Have you ever really tried this? The amount of slack cable that occurs from shifting from the middle to a missing granny position is very small and is never going to create a hazard.
HillRider is offline  
Old 03-26-18, 01:19 AM
  #12  
Senior Member
 
70sSanO's Avatar
 
Join Date: Feb 2015
Location: Mission Viejo
Posts: 5,526

Bikes: 1986 Cannondale SR400 (Flat bar commuter), 1988 Cannondale Criterium XTR, 1992 Serotta T-Max, 1995 Trek 970

Mentioned: 20 Post(s)
Tagged: 0 Thread(s)
Quoted: 1843 Post(s)
Liked 2,013 Times in 1,230 Posts
Originally Posted by HillRider
That's not what you want to do. Set the shifter up to use the middle and big chainring position and lockout the granny ring position with the low limit screw. That way if you forget and overshift to the non-existent granny position the only consequence is a slack cable.

If you lockout the big ring position, trying to overshift can break the shifter internals.
I've heard that is the correct way, but I've always blocked out the large ring on a mountain bike because of the terrain situation and needing to make a shift and then have nothing happen would be more of an issue than the over shift breakage issue.

In theory I can see your point on a road bike. In practice when someone is pushing a big gear, wanting to shift up from a 50t chainring might be a rare moment in time or maybe a rare individual.

I also wonder if this is more prevalent for early STI shifters that tended to have their share of issues.

John
70sSanO is online now  
Old 03-26-18, 01:42 AM
  #13  
Senior Member
 
Kontact's Avatar
 
Join Date: Apr 2011
Posts: 6,082
Mentioned: 41 Post(s)
Tagged: 0 Thread(s)
Quoted: 3723 Post(s)
Liked 1,047 Times in 697 Posts
Originally Posted by HillRider
As a matter of fact, yes. A manual from some incompetent source named Shimano.
The manual says it will break the shifter?
Kontact is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
becave7
General Cycling Discussion
11
04-04-17 11:42 AM
DOS
Bicycle Mechanics
4
06-21-16 04:57 AM
dugay
Bicycle Mechanics
4
11-21-15 03:05 PM
mindaugas
Bicycle Mechanics
5
04-15-14 03:28 PM
Dancing Skeleton
Bicycle Mechanics
5
10-24-10 06:29 PM

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell or Share My Personal Information -

Copyright © 2023 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.