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

Question about upgrading my Crank FSA > Ultegra SL

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.

Question about upgrading my Crank FSA > Ultegra SL

Old 05-02-12, 08:47 AM
  #1  
Vlad2010
Senior Member
Thread Starter
 
Join Date: Apr 2010
Location: Glenview, IL
Posts: 79

Bikes: 2009 Trek 2.1

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Question about upgrading my Crank FSA > Ultegra SL

Hey Guys,


Looking to replace my crankset to Ultegra SL. I've been slowly upgrading my parts and the crank is one of the last things left. Its bent, so I need to upgrade it asap.

I have a 2009 Trek 2.1 http://www.trekbikes.com/us/en/bikes/2009/archive/21

The current set up is FSA Gossamer 50/34 w/ 172.5mm arms. The set up works well for me.

I found an Ultegral SL crank on craigslist, its FC-6650 Compact Crank 50/34T, 175mm.

I also saw a sale at Nashbar:
http://www.nashbar.com/bikes/SearchD...erm=ultegra+sl

The one from nashbar is 53/39T. The 50/34 Ultegra should fit, but will 53/39T from Nashbar work?
Vlad2010 is offline  
Old 05-02-12, 08:53 AM
  #2  
mechBgon
Senior Member
 
mechBgon's Avatar
 
Join Date: Jul 2002
Posts: 6,957
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Yes, either one will fit a Trek 2.1 fine.
mechBgon is offline  
Old 05-02-12, 09:08 AM
  #3  
Vlad2010
Senior Member
Thread Starter
 
Join Date: Apr 2010
Location: Glenview, IL
Posts: 79

Bikes: 2009 Trek 2.1

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Thanks!

Originally Posted by mechBgon View Post
Yes, either one will fit a Trek 2.1 fine.
Vlad2010 is offline  
Old 05-02-12, 09:34 AM
  #4  
FastJake
Constant tinkerer
 
FastJake's Avatar
 
Join Date: May 2010
Location: Madison, Wisconsin
Posts: 7,640
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 24 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Yeah it'll work.

I was thinking about putting a compact on my road bike, but that is a pretty good deal on Nashbar... Might end up buying one myself.
FastJake is offline  
Old 05-02-12, 09:39 AM
  #5  
CACycling
Senior Member
 
CACycling's Avatar
 
Join Date: Feb 2008
Location: Oxnard, CA
Posts: 4,564

Bikes: '08 Fuji Roubaix RC; '07 Schwinn Le Tour GS; '92 Diamond Back Ascent EX

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
You may notice some difference with the slightly longer crank arms but will get used to it quickly. Moving from a compact to a standard will change your gearing quite a bit. I'd suggest running the numbers to see if the resulting gearing will work well for you. I switched from a standard to a compact and don't plan on ever going back.
CACycling is offline  
Old 05-02-12, 10:00 AM
  #6  
Vlad2010
Senior Member
Thread Starter
 
Join Date: Apr 2010
Location: Glenview, IL
Posts: 79

Bikes: 2009 Trek 2.1

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
My understaing is that 53/39 is standard and 50/34 is compact correct? Im not sure whether to get the used one off CL for 100 or a new one from Nashbar with a BB for $140. 99% of the time I ride on flat. Any suggestions on which one I should get?
Vlad2010 is offline  
Old 05-02-12, 10:12 AM
  #7  
HillRider 
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Posts: 31,492

Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!

Mentioned: 32 Post(s)
Tagged: 0 Thread(s)
Quoted: 1142 Post(s)
Likes: 0
Liked 22 Times in 21 Posts
Get the new one with the matching bottom bracket.

The choice between a standard (53/39) and a compact (50/34) depends on how much climbing you do and how fast you are on the flats. Since most cassettes these days start with a 12 or even 11T small cog, you have to be very strong to be undergeared with a 50x12 or 50x11 high gear so the compact is more versatile and will let you run a close ratio cassette while still keeping an adequate low gear.
HillRider is offline  
Old 05-02-12, 12:34 PM
  #8  
Vlad2010
Senior Member
Thread Starter
 
Join Date: Apr 2010
Location: Glenview, IL
Posts: 79

Bikes: 2009 Trek 2.1

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by HillRider View Post
Get the new one with the matching bottom bracket.

The choice between a standard (53/39) and a compact (50/34) depends on how much climbing you do and how fast you are on the flats. Since most cassettes these days start with a 12 or even 11T small cog, you have to be very strong to be undergeared with a 50x12 or 50x11 high gear so the compact is more versatile and will let you run a close ratio cassette while still keeping an adequate low gear.
Thanks! I think I will just pick up a new one, already comes with BB and less headaches than CL.
Vlad2010 is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
nans
Bicycle Mechanics
5
04-05-13 11:59 AM
cpsqlrwn
Road Cycling
0
05-03-08 03:26 PM
onelesscar
Bicycle Mechanics
1
10-20-05 05:56 AM

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

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.