Have questions or want to discuss cycling? Join Now or Sign In to participate in the BikeRide community.

New: Take part in the July Giveaway for a brand new 26" Thruster® Street Style BMX Cruiser Bicycle

New product launch: WIN an innovative aeroe Spider Rear Rack


Changing front gear rings
#1
At the moment I have a compact gear set with a 50-34 chain ring on the front, if I want to change this for a 52 -39 on the front will I have to change the company derellier on the back, and if so why

  Reply
#2
If it was the other way round, you'd run into problems. The limiting parameter is the so-called "capacity" of the derailleur, that is, how many teeth difference it can accommodate (the additional length of the chain, difference between "small - small" and "large - large" gear combination). This is why derailleurs come in different sizes (cage length) for road bikes, depending on the gear combinations one wishes to install. Since the needed "capacity" is smaller after your modification, you do not have to install a new derailleur. However: shifting performance could benefit from a shorter cage.
All the best,<br />
Joe
EDIT:<br />
Also, shifting performance will most probably benefit from a new front derailleur.

  Reply
#3
Thanks for that I will try it this weekend
Mike

  Reply


Possibly Related Threads...

Forum Jump:

[-]
10 Latest Posts
26" Thruster® Street Style BMX | July 20...
Yesterday 10:21 PM
Dork disc - remove it or keep it?
Yesterday 09:10 PM
Specialized Allez Upgrade
Yesterday 07:59 PM
Taylor Phinney retires
Yesterday 06:33 PM
Front derailleur spring
Yesterday 01:24 PM
TOMMASINI (EXPORT?) 80's
Yesterday 01:08 PM
Post a photo for aeroe Spider Rear Rack
Yesterday 03:20 AM
Biking inUtah
07-11-2020 11:40 PM
BAGGI 1936(?)
07-11-2020 08:14 PM
QUINTANA ROO "KILO" 1999
07-11-2020 01:48 PM

[-]
Top 5 Posters This Month
no avatar 1. Jesper
80 posts
no avatar 2. CharleyFarley
24 posts
no avatar 3. Painkiller
11 posts
no avatar 4. Papa Dom
10 posts
no avatar 5. Nikko
8 posts