Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

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.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 05-20-09, 10:16 AM   #1
kipibenkipod
Got an old Peugeot
Thread Starter
 
kipibenkipod's Avatar
 
Join Date: Jul 2007
Location: I'm from Israel
Bikes: I had a Trek 1200
Posts: 642
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Replacing barcons with gripshift ?

Hi,
I have a touring bike with barcons shifters.
I have replaced the handlebar to a trekking bar.
The handle bar clamp size about 22mm.
It is Shimano RSX 8 gears, and I will install a cassette of 32.
Will every grip shift work?
I'm looking on the SRAM X.7 ESP Shorty Twist Shifting Lever.

Thanks for your help,
Kfir
kipibenkipod is offline   Reply With Quote
Old 05-20-09, 11:06 AM   #2
bikeman715
Senior Member
 
bikeman715's Avatar
 
Join Date: Mar 2008
Location: Salinas , Ca.
Bikes: Bike Nashbar AL-1 ,Raligh M50 , Schwinn Traveler , and others
Posts: 2,447
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
yes they will.
bikeman715 is offline   Reply With Quote
Old 05-20-09, 11:08 AM   #3
kipibenkipod
Got an old Peugeot
Thread Starter
 
kipibenkipod's Avatar
 
Join Date: Jul 2007
Location: I'm from Israel
Bikes: I had a Trek 1200
Posts: 642
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by bikeman715 View Post
yes they will.
Is it something general that all the gripshift will fit?

Thanks,
Kfir
kipibenkipod is offline   Reply With Quote
Old 05-21-09, 12:19 PM   #4
hernick
Senior Member
 
Join Date: Oct 2007
Location: Québec, Québec, Canada
Bikes: Fuji Touring 64cm, Peugeot Canada PB-18 61cm and winter beaters
Posts: 225
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
All gripshifts that I know of are designed to fit MTB-diameter (22.2mm) handlebars, which includes flat bars, riser bars, trekking bars, north road bars... So, all gripshifts will physically fit on your handlebars.

However !

While the left (front derailleur) gripshift can be of any type, the right (rear derailleur) has to be of Shimano 8-speed type.

The rear SRAM shifter you linked to will **NOT** work, because it is of the 1:1 actuation ratio type. In the "compatiblity" section, it says: "SRAM 1:1 9 or 8-speed rear derailleurs". You do not have such a rear derailleur. Do not purchase these gripshifters.

What you need is a Shimano-compatible (2:1 actuation ratio) rear shifter. Like this or this.

As I said, the front (left) shifter doesn't matter, it's all compatible.
hernick is offline   Reply With Quote
Old 05-21-09, 01:03 PM   #5
kipibenkipod
Got an old Peugeot
Thread Starter
 
kipibenkipod's Avatar
 
Join Date: Jul 2007
Location: I'm from Israel
Bikes: I had a Trek 1200
Posts: 642
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Hernick,
Thanks for taking the time and show me what will fit my bike.
I really appreciate it.

Thanks,
Kfir
kipibenkipod is offline   Reply With Quote
Old 05-21-09, 05:31 PM   #6
JiveTurkey
Low car diet
 
JiveTurkey's Avatar
 
Join Date: Aug 2007
Location: Corvallis, OR, USA
Bikes: 2006 Windsor Dover w/105, 2007 GT Avalanche w/XT, 1995 Trek 820 setup for touring, 201? Yeah single-speed folder, 199? Huffy tandem.
Posts: 2,407
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Front derailleurs and shifters are NOT all compatible.

Generally speaking, the only time everything's compatible is when it is in friction mode, not index.

Shimano road vs MTB front shifter/derailleurs utilize different cable-pull ratios. Shimano and SRAM flat-bar/MTB front shifters/derailleurs are compatible though.

If you go with the Shimano or SRAM shifters, you may need a Shimano MTB-compatible front derailleur.

What size chainrings are you using? There are MTB front deraillaurs rated up to 48T.

Edit: Upon further research, it appears grip-shifters may have a micro-indexing which allows the shifter to be in more positions than just the 3 marked on it. If that's the case (and it's been a while since I've had my hands on a grip-shifter), it should work similar to a friction set-up.

Last edited by JiveTurkey; 05-21-09 at 05:40 PM.
JiveTurkey is offline   Reply With Quote
Old 05-21-09, 10:57 PM   #7
hernick
Senior Member
 
Join Date: Oct 2007
Location: Québec, Québec, Canada
Bikes: Fuji Touring 64cm, Peugeot Canada PB-18 61cm and winter beaters
Posts: 225
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Indeed, the actuation ratio of road and MTB front derailleurs is a bit different. The MTB front derailleurs need a bit more cable pull.

However, all the SRAM front grip shifters that I know of are not indexed, but instead operate in a friction-like mode with tons of little clicks. They call it "micro-indexing", which is functionally equivalent to friction shifting. The " 1 2 3 " printed on the SRAM front grip shifter are for reference only.

Since the SRAM front grip shifter is designed to pull enough cable for a MTB front derailleur, and those need more cable pull than road triple front derailleurs, the SRAM front grip shifter can certainly pull enough cable to shift correctly through all front gears of a road triple FD.

Any SRAM front grip shifter with "Micro Index" (and to my knowledge, every SRAM front grip shifter is indeed Micro Index) will work just fine with your front derailleur. The "1 2 3" printed on the shifter may not line up perfectly, but that will have no impact on your shifting performance.
hernick is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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



All times are GMT -6. The time now is 05:12 PM.