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

Dura Ace Bar Ends to Thumbies : WIDE PHYSICAL RANGE!

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.

Dura Ace Bar Ends to Thumbies : WIDE PHYSICAL RANGE!

Reply

Old 02-08-19, 06:13 PM
  #1  
michaelm101
Senior Member
Thread Starter
 
Join Date: Jul 2017
Location: SoCal
Posts: 195

Bikes: Cannondale Carbon Synapse Road, Cannondale T2000 Touring, Cannondale Flash 3 29er MTB, Vintage Mongoose IBOC Pro MTB, Vintage Peugeot 12spd racer, Old rusty Schwinn Manta Ray I neglected as a child, Diamondback Haanjo EXP Carbon & Haanjo Metro

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 103 Post(s)
Dura Ace Bar Ends to Thumbies : WIDE PHYSICAL RANGE!

I just converted my drop bar bike with bar end shifters to trekking bars with Paul Thumbies. The sweep of my rear shifter goes from about 10:00 to 3:00. I have large hands and this circular sweep is simply quite big. I find myself having to leverage my palm on the top bar to shift beyond midway through the cogs. Does this come with the territory or is there something rotten in Denmark? Thanks in advance!
michaelm101 is online now  
Reply With Quote
Old 02-09-19, 07:57 AM
  #2  
easyupbug 
Senior Member
 
Join Date: Jan 2013
Posts: 1,056

Bikes: too many sparkly Italians, some sweet Americans and a couple interesting Japanese

Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 134 Post(s)
If I understand your question correctly, my experience with DA bar ends and thumbies was about the same. They are long gone as thumb arthritis makes thumbies very unpleasant. My memory is about a 150-160 swing for my 9 speed cogs.
easyupbug is offline  
Reply With Quote
Old 02-09-19, 08:35 AM
  #3  
delbiker1 
Senior Member
 
delbiker1's Avatar
 
Join Date: Mar 2016
Location: Sussex County, Delaware
Posts: 361

Bikes: 1991 Ochsner steel frame, 2002 Airborne Zeppelin titanium, Schwinn DBX SS aluminum, Orbea MD 40 carbon fiber

Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 92 Post(s)
Thumb

Originally Posted by easyupbug View Post
If I understand your question correctly, my experience with DA bar ends and thumbies was about the same. They are long gone as thumb arthritis makes thumbies very unpleasant. My memory is about a 150-160 swing for my 9 speed cogs.

I can sure relate to a problem with arthritis in the thumb joint. My left thumb especially. It is gnarly looking with a large knot and swollen. It is the sorest spot on my body and always, at best, a bit sore. It affects my grip on the bars, no matter where my hands are, and also, at times makes painful to use the brifters for shifting and braking. It is the most arthritic joint in humans.
delbiker1 is online now  
Reply With Quote
Old 02-09-19, 11:37 PM
  #4  
Jeff Wills
Insane Bicycle Mechanic
 
Jeff Wills's Avatar
 
Join Date: Mar 2008
Location: other Vancouver
Posts: 8,852
Mentioned: 21 Post(s)
Tagged: 0 Thread(s)
Quoted: 393 Post(s)
This is a characteristic of using bar-ends for thumb shifters. The bar-end (and downtube) shifters have a small diameter barrel, which requires a large amount of rotation to pull the required amount of cable. Genuine thumbshifters (which disappeared in the early '90's) use a larger barrel which pulls more cable.


__________________
Jeff Wills

Comcast nuked my web page. It will return soon..

Last edited by Jeff Wills; 02-11-19 at 12:23 AM.
Jeff Wills is offline  
Reply With Quote
Old 02-10-19, 03:23 PM
  #5  
michaelm101
Senior Member
Thread Starter
 
Join Date: Jul 2017
Location: SoCal
Posts: 195

Bikes: Cannondale Carbon Synapse Road, Cannondale T2000 Touring, Cannondale Flash 3 29er MTB, Vintage Mongoose IBOC Pro MTB, Vintage Peugeot 12spd racer, Old rusty Schwinn Manta Ray I neglected as a child, Diamondback Haanjo EXP Carbon & Haanjo Metro

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 103 Post(s)
Originally Posted by Jeff Wills View Post
This is a characteristic of using bar-ends for thumb shifters. The bar-end (and downtube) shifters have a small diameter barrel, which requires a large amount of rotation to pull the required amount of cable. Genuine thumbshifters (which disappeared in the early '90's) use a larger barrel which pulls more cable.
Indeed, with those things on the bar ends, the whole palm of hand can easily move them up or down. I used them for easy maintenance as opposed to indexed. Are there better (less taxing) thumb type shifters out there, like perhaps, the Microshift system?
michaelm101 is online now  
Reply With Quote
Old 02-10-19, 03:41 PM
  #6  
ThermionicScott 
Hammer and tongs
 
ThermionicScott's Avatar
 
Join Date: Aug 2011
Location: CID
Posts: 17,676

Bikes: 1991 Bianchi Eros, 1964 Armstrong, 1988 Diamondback Ascent, 1988 Bianchi Premio, 1987 Bianchi Sport SX, 1980s Raleigh mixte (hers)

Mentioned: 55 Post(s)
Tagged: 0 Thread(s)
Quoted: 1730 Post(s)
If you're running friction shifting (not sure which generation of DA you have), you could try sleeving the shift cable with some insulation where it wraps around the barrel. That would pull more cable and allow you to proceed through the FW/cassette with less sweep of the shift lever.

But if you've got index shifting, you can disregard this. That would take more doin'.
__________________
Originally Posted by chandltp View Post
There's no such thing as too far.. just lack of time
Originally Posted by noglider
People in this forum are not typical.
RUSA #7498
ThermionicScott is offline  
Reply With Quote
Old 02-10-19, 04:29 PM
  #7  
nomadmax 
Senior Member
 
Join Date: Jun 2018
Location: SW Ohio
Posts: 530
Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 220 Post(s)
I was thinking of something like a J-Tek Shiftmate that would have a pulley to decrease lever travel.
nomadmax is offline  
Reply With Quote
Old 02-11-19, 12:34 AM
  #8  
Jeff Wills
Insane Bicycle Mechanic
 
Jeff Wills's Avatar
 
Join Date: Mar 2008
Location: other Vancouver
Posts: 8,852
Mentioned: 21 Post(s)
Tagged: 0 Thread(s)
Quoted: 393 Post(s)
I'm not sure how we got from index to friction shifters. Every time I've seen Shimano bar-ends on Pauls Thumbies mounts, they've been index. The Microshift thumbshifters share the same small(er) shifter barrel.

__________________
Jeff Wills

Comcast nuked my web page. It will return soon..
Jeff Wills is offline  
Reply With Quote
Old 02-12-19, 01:31 PM
  #9  
michaelm101
Senior Member
Thread Starter
 
Join Date: Jul 2017
Location: SoCal
Posts: 195

Bikes: Cannondale Carbon Synapse Road, Cannondale T2000 Touring, Cannondale Flash 3 29er MTB, Vintage Mongoose IBOC Pro MTB, Vintage Peugeot 12spd racer, Old rusty Schwinn Manta Ray I neglected as a child, Diamondback Haanjo EXP Carbon & Haanjo Metro

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 103 Post(s)
Originally Posted by Jeff Wills View Post
This is a characteristic of using bar-ends for thumb shifters. The bar-end (and downtube) shifters have a small diameter barrel, which requires a large amount of rotation to pull the required amount of cable. Genuine thumbshifters (which disappeared in the early '90's) use a larger barrel which pulls more cable.


I have a set of 7 speed Shimano XT friction shifters on a vintage late 1980s mountain bike. Does anyone know if these will pull modern 9 speed more efficiently than my bar-end/thumbie combo?
michaelm101 is online now  
Reply With Quote
Old 02-12-19, 01:49 PM
  #10  
CliffordK
Senior Member
 
CliffordK's Avatar
 
Join Date: Nov 2014
Location: Eugene, Oregon, USA
Posts: 21,428
Mentioned: 146 Post(s)
Tagged: 0 Thread(s)
Quoted: 7805 Post(s)
How many speeds are you shifting?

Microshift makes the "Mega" for 11 speed MTB RD, in both bar end and thumbie shifters.

I don't think they have a friction mode though. Is the left some kind of modified friction?
CliffordK is offline  
Reply With Quote
Old 02-12-19, 02:11 PM
  #11  
alcjphil
Senior Member
 
alcjphil's Avatar
 
Join Date: Jun 2002
Location: Montreal, Quebec
Posts: 2,834
Mentioned: 8 Post(s)
Tagged: 0 Thread(s)
Quoted: 493 Post(s)
Originally Posted by michaelm101 View Post
I have a set of 7 speed Shimano XT friction shifters on a vintage late 1980s mountain bike. Does anyone know if these will pull modern 9 speed more efficiently than my bar-end/thumbie combo?
If you own both shifters, measuring the diameter of shift drum will determine how far you move the lever for each shift. 7 speed cassettes are about 4.5 mm narrower than 9 speed cassettes, so you would have to allow for that extra travel. As for efficiency, a larger shift drum means less lever travel for each shift, but higher effort. A smaller shift drum requires less effort to shift from gear to gear, but more overall lever movement
alcjphil is offline  
Reply With Quote
Old 02-12-19, 02:31 PM
  #12  
CliffordK
Senior Member
 
CliffordK's Avatar
 
Join Date: Nov 2014
Location: Eugene, Oregon, USA
Posts: 21,428
Mentioned: 146 Post(s)
Tagged: 0 Thread(s)
Quoted: 7805 Post(s)
Suntour made a Power Shifter stem shifter that was huge. I think it was designed to only go through a 90 degree range of motion (or less).

It might be interesting to see if one could be adapted/modified for use with your thumbies.

CliffordK is offline  
Reply With Quote
Old 02-12-19, 11:34 PM
  #13  
Jeff Wills
Insane Bicycle Mechanic
 
Jeff Wills's Avatar
 
Join Date: Mar 2008
Location: other Vancouver
Posts: 8,852
Mentioned: 21 Post(s)
Tagged: 0 Thread(s)
Quoted: 393 Post(s)
Originally Posted by michaelm101 View Post
I have a set of 7 speed Shimano XT friction shifters on a vintage late 1980s mountain bike. Does anyone know if these will pull modern 9 speed more efficiently than my bar-end/thumbie combo?
If they're "7-speed", they're index shifters. However, Shimano shifters of that era could be switched to friction- there's a little lever that changes them from index to friction. They should work for you- the only possible bugaboo is if they don't pull enough cable to shift the derailleur across the entire cassette. The only way to find out is to try.
__________________
Jeff Wills

Comcast nuked my web page. It will return soon..
Jeff Wills is offline  
Reply With Quote
Old 02-13-19, 12:27 AM
  #14  
michaelm101
Senior Member
Thread Starter
 
Join Date: Jul 2017
Location: SoCal
Posts: 195

Bikes: Cannondale Carbon Synapse Road, Cannondale T2000 Touring, Cannondale Flash 3 29er MTB, Vintage Mongoose IBOC Pro MTB, Vintage Peugeot 12spd racer, Old rusty Schwinn Manta Ray I neglected as a child, Diamondback Haanjo EXP Carbon & Haanjo Metro

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 103 Post(s)
Originally Posted by Jeff Wills View Post
If they're "7-speed", they're index shifters. However, Shimano shifters of that era could be switched to friction- there's a little lever that changes them from index to friction. They should work for you- the only possible bugaboo is if they don't pull enough cable to shift the derailleur across the entire cassette. The only way to find out is to try.
Thanks. I rode the bike last night and I think I can deal with the big sweep for my "no rush" touring endeavors. ---Just another excuse to get another fast-shifting bike for group rides!
michaelm101 is online now  
Reply With Quote

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


Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service