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

New rings Old derailleur?

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.

New rings Old derailleur?

Reply

Old 03-20-11, 03:51 PM
  #1  
Baftap
Riding my bike
Thread Starter
 
Join Date: Aug 2006
Location: Bi-Coastal Bays (Boston & SF)
Posts: 167

Bikes: Giant TCR C2 / Bianchi "beater"

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
New rings Old derailleur?

I have an older Bianchi hybrid (specs here: http://bikepedia.com/QuickBike/BikeS...walk&Type=bike ) that needs some work.

The chain and rear cogs are worn and should be fairly easy to replace. While I'm at it, I thought I'd replace the chainrings which are also worn and I'd like to go to a larger big ring for more road-like gearing.

Does anyone know if a 50T ring is available that will fit the Alivio crank? Or maybe theres another crank with a 50T or 52T big ring compatible with the existing BB? Either way, I'd like to be able to use the existing Acera front dérailleur.

Any thoughts? Thanks.
Baftap is offline  
Reply With Quote
Old 03-20-11, 04:59 PM
  #2  
Burton
Certified Bike Brat
 
Burton's Avatar
 
Join Date: Jan 2011
Location: Montreal, Quebec
Posts: 4,251
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
As far as I know 48T is the largest chainring you`ll find for a mtb crankset. You`d probably be happy with that anyway based on your current gearing. No reason you can`t just go to larger chainrings and move your current front derailleur further up the seatpost.

Probably a good idea to double check your BB assembly if your drivetrain is shot. One of the cheapest components you`ll be replacing.
Burton is offline  
Reply With Quote
Old 03-20-11, 05:06 PM
  #3  
FBinNY 
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Posts: 36,049

Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter

Mentioned: 121 Post(s)
Tagged: 1 Thread(s)
Quoted: 4331 Post(s)
Enter the number of teeth followed by 110bcd into your search engine to see what's available, for example 52t 110bcd which brought up a few choices.
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is offline  
Reply With Quote
Old 03-20-11, 07:03 PM
  #4  
Baftap
Riding my bike
Thread Starter
 
Join Date: Aug 2006
Location: Bi-Coastal Bays (Boston & SF)
Posts: 167

Bikes: Giant TCR C2 / Bianchi "beater"

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks. It looks like I have a couple of options.
Baftap is offline  
Reply With Quote
Old 03-20-11, 08:59 PM
  #5  
Burton
Certified Bike Brat
 
Burton's Avatar
 
Join Date: Jan 2011
Location: Montreal, Quebec
Posts: 4,251
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Originally Posted by Baftap View Post
Thanks. It looks like I have a couple of options.
Don`t count your chickens just yet! FB is usually pretty good but looks like he thinks you already have that road crank you were talking about installed.

The numbers you`re looking for for the Alivio crank you currently have on the bike are 104/64mm. Maybe you want to try that search again using 104 instead of 110mm.
Burton is offline  
Reply With Quote
Old 03-21-11, 06:42 AM
  #6  
Baftap
Riding my bike
Thread Starter
 
Join Date: Aug 2006
Location: Bi-Coastal Bays (Boston & SF)
Posts: 167

Bikes: Giant TCR C2 / Bianchi "beater"

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
You know, I remeasured after I posted and discovered that!

Back to the drawing board, I'm afraid....
Baftap is offline  
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