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 08-06-10, 03:21 PM   #1
cradduck
This town needs an enema.
Thread Starter
 
Join Date: Jul 2005
Location: Huntington Beach, Ca.
Bikes: Bridgestone 400
Posts: 795
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Just add another chainring?

I was looking at an advertisement for my 1986 Bridgestone 400 the other day and noticed that it showed a third, inner chainring as an optional item to have put on the bike.

If I had an extra triple crankset sitting around (which I do), would putting the triple on my Bridgestone be as simple as bolting it on and then adjusting the hi/low on my front derailleur (Suntour AGX)? Or am I really looking at having to find another front derailleur with enough travel to accomidate a triple chainring?
cradduck is offline   Reply With Quote
Old 08-06-10, 03:28 PM   #2
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)
Things to keep in mind:
-Do you have the matching bottom bracket?
-Will the front derailleur work okay with a triple? It's not about having enough throw, it's that triple FDs have a deeper inner plate to help shift from inner to middle. My understanding is that this is not so big of a deal with friction. (Were there even triple-specific FDs in the days of friction?)
-Does the rear derailleur have a long enough cage? You should be able to use the big/big combo, and still be able to use the inner chainring with the smallest cogs without the RD folding into itself (due to not being able to take up the slack created).
JiveTurkey is offline   Reply With Quote
Old 08-06-10, 05:31 PM   #3
HillRider 
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
Posts: 28,847
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 66 Post(s)
I had exactly the same bike, purchased new, and did add the third ring soon after i got it.

If you still have the original SR crank you can add a third granny ring (standard 74 mm bcd) and you will only need the bolts and spacers to do so. The OEM bottom bracket is long enough to clear the third ring. If you are going to use a different model crank, you will have to try it to see if everything clears.

The original Sun Tour ARX derailleurs will shift the triple just fine and the front will only need to have the inner limit screw readjusted.
HillRider is offline   Reply With Quote
Old 08-11-10, 12:38 AM   #4
cradduck
This town needs an enema.
Thread Starter
 
Join Date: Jul 2005
Location: Huntington Beach, Ca.
Bikes: Bridgestone 400
Posts: 795
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
awesome. thanks for the info hillrider!
cradduck 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 02:38 PM.