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 08-03-07, 10:09 AM   #1
gholt
Senior Member
Thread Starter
 
Join Date: Sep 2006
Location: Layton, UT
Bikes: 2004 Giant OCR, 2002 Specialized Stumpjumper, 2008 Trek 6500 Disc
Posts: 686
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Adding Granny gear to Ultegra double crank

I looks like the original post never posted. So, I will ask again. When upgrading to add a granny gear to to an Ultegra double crank does one only need to replace the crank and brifter, or are there certain chainrings that can be added to double cranks without replacing the crank itself?

Or, does the derailurer need to be replaced as well?

There are a lot of hills here, and on certain of them, I think it would be useful to have.
gholt is offline   Reply With Quote
Old 08-03-07, 10:18 AM   #2
bikeaday
Member
 
Join Date: Jul 2007
Bikes:
Posts: 42
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by gholt View Post
I looks like the original post never posted. So, I will ask again. When upgrading to add a granny gear to to an Ultegra double crank does one only need to replace the crank and brifter, or are there certain chainrings that can be added to double cranks without replacing the crank itself?

Or, does the derailurer need to be replaced as well?

There are a lot of hills here, and on certain of them, I think it would be useful to have.
Hi,
You'll need a new triple crank and new FD (for triple) and RD (for triple with a longuer cage). If you have ultegra 9 speed 6510/6501 shifter there's no need to replace the left shifter. But if you have the 10 speed groupo. you will need a new left shifter.
bikeaday is offline   Reply With Quote
Old 08-03-07, 10:33 AM   #3
gholt
Senior Member
Thread Starter
 
Join Date: Sep 2006
Location: Layton, UT
Bikes: 2004 Giant OCR, 2002 Specialized Stumpjumper, 2008 Trek 6500 Disc
Posts: 686
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
OK. Thanks, I guess it will end up being a little more spendy than I originally thought. I may hold off for a bit.
gholt is offline   Reply With Quote
Old 08-03-07, 10:49 AM   #4
acorn_user
Senior Member
 
Join Date: Dec 2005
Location: Charlottesville, Virginia
Bikes: Dawes Kalahari, Puch Prima Super Sport, Graham Weigh 853
Posts: 1,990
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
The lowest chainring you can fit is 38t. Your best bet is to change the rear gearing. If you have 9 speed, you can fit an mtb cassette. If you go over 30t ish, you will need a new mtb derailleur too. Deore is very cheap for the quality.
If you have 10 speed, IRD make wide range cassettes, but they are quite steep.

You will lose the tight cogs, but gain hill climbing gears. If you pick your ratios carefully, you should be fine.
acorn_user is offline   Reply With Quote
Old 08-03-07, 11:17 AM   #5
DMF 
Elitist Troglodyte
 
DMF's Avatar
 
Join Date: Jun 2006
Location: Dallas
Bikes: 03 Raleigh Professional (steel)
Posts: 6,924
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
What are you trying to accomplish? Easier climbing? You can change the cassette.
__________________
Stupidity got us into this mess - why can't it get us out?

- Will Rogers
DMF is offline   Reply With Quote
Old 08-03-07, 11:18 AM   #6
gholt
Senior Member
Thread Starter
 
Join Date: Sep 2006
Location: Layton, UT
Bikes: 2004 Giant OCR, 2002 Specialized Stumpjumper, 2008 Trek 6500 Disc
Posts: 686
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Oh, i just thought it would be easier to have the triple up front for the really big hills. I can climb them now, but I would like to have a better go at them than I have right now.
gholt is offline   Reply With Quote
Old 08-03-07, 11:21 AM   #7
DMF 
Elitist Troglodyte
 
DMF's Avatar
 
Join Date: Jun 2006
Location: Dallas
Bikes: 03 Raleigh Professional (steel)
Posts: 6,924
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
You're right. A triple would be better for most riders (I prefer using one). But as you see it's not cheap to make that conversion.

What's the gear range on your cassette?
__________________
Stupidity got us into this mess - why can't it get us out?

- Will Rogers
DMF is offline   Reply With Quote
Old 08-03-07, 11:33 AM   #8
bfromcolo
Senior Member
 
bfromcolo's Avatar
 
Join Date: Feb 2007
Location: Monument, Colorado
Bikes:
Posts: 379
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
My road bike came with 52/42 chainrings and a 13-26 freewheel. The cheapest approach I found to get more acceptable gearing for the hills around here was going to a 38 chainring, and 13-32 freewheel, which required a new rear derailler. This cost me about $45 total to do. It dropped the gear inches from 42.6" in 42x26 to 31.3" in 38x32, a very noticeable difference. Since I have an old Suntour setup I had to go to friction shifting, but thats fine.
bfromcolo is offline   Reply With Quote
Old 08-03-07, 12:36 PM   #9
Bekologist
totally louche
 
Bekologist's Avatar
 
Join Date: Oct 2004
Location: A land that time forgot
Bikes: the ever shifting stable loaded with comfortable road bikes and city and winter bikes
Posts: 18,025
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
FSA makes a middle ring to convert 130bcd doubles to triples. you still need a triple derailluer, and shifter may/may not need to be changed.
Bekologist is offline   Reply With Quote
Old 08-03-07, 12:56 PM   #10
tellyho
Your mom
 
Join Date: Aug 2006
Bikes:
Posts: 2,541
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
If you buy a new crank you will also need a new bottom bracket in addition to your new derailleurs and left brifter, which bikeaday probably forgot. It's not a cheap solution. You may be able to get away with buying a different cassette and swapping in a mountain (usually XT) long-cage derailleur to handle the greater range. There are a few threads around on this; do some research and see what you like.
tellyho is offline   Reply With Quote
Old 08-03-07, 02:04 PM   #11
DMF 
Elitist Troglodyte
 
DMF's Avatar
 
Join Date: Jun 2006
Location: Dallas
Bikes: 03 Raleigh Professional (steel)
Posts: 6,924
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by tellyho View Post
If you buy a new crank you will also need a new bottom bracket
Maybe, depending on what is on there now. External bearings (10-speed Ultegra) go both ways.
__________________
Stupidity got us into this mess - why can't it get us out?

- Will Rogers
DMF is offline   Reply With Quote
Old 08-09-07, 11:44 AM   #12
gholt
Senior Member
Thread Starter
 
Join Date: Sep 2006
Location: Layton, UT
Bikes: 2004 Giant OCR, 2002 Specialized Stumpjumper, 2008 Trek 6500 Disc
Posts: 686
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I saw one of the FSA that allows one to add the smaller chainring up front. So, If put this one on my bike for the middle ones and then add the smaller one, All the extras I may need to buy is a new brifiter up front, if I can't get the shifting to accomidate the new set-up?

Also, has there been may people out there that have experience with these FSA double / triple chain rings?

The main reason I want this is to climb hill I couldn't achieve otherwise. Here is the one I went on last week that I finally had to give up and walk up a portion of it.

http://www.gmap-pedometer.com/?r=1196433
gholt is offline   Reply With Quote
Old 08-10-07, 09:56 AM   #13
DMF 
Elitist Troglodyte
 
DMF's Avatar
 
Join Date: Jun 2006
Location: Dallas
Bikes: 03 Raleigh Professional (steel)
Posts: 6,924
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Geez, if you're gonna make the investment in new brifter, BB(?), dérailleur, why scrimp on the crank set? Just buy a factory triple and sell the old one on eBay. The difference will likely come to less than the FSA add-on and you won't have to worry about chain line and FD range, etc..
__________________
Stupidity got us into this mess - why can't it get us out?

- Will Rogers
DMF 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 01:37 AM.