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


Go Back   > >

General Cycling Discussion Have a cycling related question or comment that doesn't fit in one of the other specialty forums? Drop on in and post in here! When possible, please select the forum above that most fits your post!

User Tag List

Reply
 
Thread Tools Search this Thread
Old 07-26-09, 07:18 PM   #1
warriorsdad
HARD WORK PAYS OFF!
Thread Starter
 
Join Date: Jun 2009
Location: southern cali
Bikes: specialized
Posts: 7
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
crank questions

Hi I'm looking at getting a new pair of cranks for my bike and I found a good deal on a pair of fsa but they have 3 chainrings and my current cranks have 2 what do I have to do to make sure they're compatible with my bike or what would I have to replace to make them compatible. I'm only doing a few upgrades since I'm a newbie. Even though I love the sport its just an older bike and I am saving to get a better bike and don't want to invest a bunch of cash but the cranks flex on my fat a** so there a must to replace till I step up in quality.. Thanks everyone in advance you've all been very helpful with all my other newbie questions you guys rock
warriorsdad is offline   Reply With Quote
Old 07-26-09, 11:51 PM   #2
iareConfusE
Number One
 
iareConfusE's Avatar
 
Join Date: Apr 2009
Location: Danville, CA
Bikes: Scott CR1 Elite
Posts: 536
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
If your current bike is a double, and you want a triple, you'll need to get a new front shifter, and possibly a new front derailleur.
iareConfusE is offline   Reply With Quote
Old 07-27-09, 04:20 AM   #3
KevinF
Keep on climbing
 
Join Date: Apr 2004
Location: Marlborough, Massachusetts
Bikes: 2004 Calfee Tetra Pro
Posts: 2,136
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Changing an older bike's double to a triple involves changing the bottom bracket as well. If you have the integrated brake / shift units, then you'll need a new one of those as well (and they are shockingly expensive). Probably need to change the front derailleur as well.

I wasn't sure what you meant by the cranks flexing? Older crank arms at least are basically solid pieces of metal. They're not flexing a whole lot. The frame itself can be flexing (usually indicated by hearing the chain rub on the front derailleur while you're pedaling hard), but changing the cranks won't do anything to alleviate that.

What sort of bike do you have now?
KevinF is offline   Reply With Quote
Old 07-27-09, 08:32 AM   #4
warriorsdad
HARD WORK PAYS OFF!
Thread Starter
 
Join Date: Jun 2009
Location: southern cali
Bikes: specialized
Posts: 7
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I have an older specialized sirrus it has shimano 105 cranks now I never thought it could be the frame though there no rubbing going on just when I pedal hard up hill or stand up to pedal it feels like the cranks are weak. But I could be mistaken.
warriorsdad is offline   Reply With Quote
Old 07-27-09, 12:04 PM   #5
stapfam
Time for a change.
 
stapfam's Avatar
 
Join Date: Jan 2004
Location: 6 miles inland from the coast of Sussex, in the South East of England
Bikes: Dale MT2000. Bianchi FS920 Kona Explosif. Giant TCR C. Boreas Ignis. Pinarello Fp Uno.
Posts: 19,915
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Quote:
Originally Posted by warriorsdad View Post
I have an older specialized sirrus it has shimano 105 cranks now I never thought it could be the frame though there no rubbing going on just when I pedal hard up hill or stand up to pedal it feels like the cranks are weak. But I could be mistaken.
105 cranks will not flex unless you have very strong legs- the cranks/ bottom bracket are loose or you have a cracked frame.

To change from double to triple will be a new set of cranks along with the bottom bracket- probably a new front derailler and may require new shifters.

Check the bike out and unless you need lower gears- I would not bother changing. And if you do require lower gears- then changing the rear cassette or chainrings is a far cheaper alternative.
__________________
How long was I in the army? Five foot seven.


Spike Milligan
stapfam 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 05:43 PM.