Notices
Cyclocross and Gravelbiking (Recreational) This has to be the most physically intense sport ever invented. It's high speed bicycle racing on a short off road course or riding the off pavement rides on gravel like : "Unbound Gravel". We also have a dedicated Racing forum for the Cyclocross Hard Core Racers.

Compact to cyclocross crank?

Old 03-12-14, 12:25 PM
  #1  
aquateen
Senior Member
Thread Starter
 
Join Date: Oct 2007
Location: Washington, DC
Posts: 635

Bikes: CAAD10 5, Trek 1000 Alpha Series

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Compact to cyclocross crank?

I have a Shimano compact crank (50/34) and was curious if I could change the rings for a more cross-style gearing (46/36) while maintaining the same crank. Is this possible? I wasn't sure with the different ring sizes
aquateen is offline  
Old 03-12-14, 01:03 PM
  #2  
Barrettscv 
Have bike, will travel
 
Barrettscv's Avatar
 
Join Date: Feb 2006
Location: Lake Geneva, WI
Posts: 12,340

Bikes: Ridley Helium SLX, Canyon Endurance SL, De Rosa Professional, Eddy Merckx Corsa Extra, Schwinn Paramount (1 painted, 1 chrome), Peugeot PX10, Serotta Nova X, Simoncini Cyclocross Special, Raleigh Roker, Pedal Force CG2 and CX2

Mentioned: 46 Post(s)
Tagged: 0 Thread(s)
Quoted: 885 Post(s)
Liked 229 Times in 127 Posts
You should change both rings for best results. Aftermarket chainrings are so overpriced that a new crank can be cheaper. You should be able to sell your compact on fleabay to reduce your investment.
__________________
When I ride my bike I feel free and happy and strong. I'm liberated from the usual nonsense of day to day life. Solid, dependable, silent, my bike is my horse, my fighter jet, my island, my friend. Together we will conquer that hill and thereafter the world.
Barrettscv is offline  
Old 03-12-14, 02:52 PM
  #3  
Sportster2009
Senior Member
 
Join Date: Apr 2010
Posts: 116
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I actually just had the opposite done. I bought a Cannondale CAADx Ultegra Disc. I had them change the small chainring from a 36 to a 34. I now have 46/34 because I need the granny climbing gears as I'm primarily using the bike on the road. It works like a champ.

Last edited by Sportster2009; 03-12-14 at 03:02 PM.
Sportster2009 is offline  
Old 03-12-14, 02:56 PM
  #4  
ModeratedUser
Banned
 
Join Date: May 2007
Posts: 974
Mentioned: 5 Post(s)
Tagged: 1 Thread(s)
Quoted: 54 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
46/34 sounds sweet! Can someone give an idea of what the range is on the two rings? That type of info is not really that easy to find. I have to rely on retailers for a clue!
ModeratedUser is offline  
Old 03-12-14, 03:20 PM
  #5  
Barrettscv 
Have bike, will travel
 
Barrettscv's Avatar
 
Join Date: Feb 2006
Location: Lake Geneva, WI
Posts: 12,340

Bikes: Ridley Helium SLX, Canyon Endurance SL, De Rosa Professional, Eddy Merckx Corsa Extra, Schwinn Paramount (1 painted, 1 chrome), Peugeot PX10, Serotta Nova X, Simoncini Cyclocross Special, Raleigh Roker, Pedal Force CG2 and CX2

Mentioned: 46 Post(s)
Tagged: 0 Thread(s)
Quoted: 885 Post(s)
Liked 229 Times in 127 Posts
Use this tool to calculate all kinds of data for your drivetrain: Mike Sherman's Bicycle Gear Calculator
__________________
When I ride my bike I feel free and happy and strong. I'm liberated from the usual nonsense of day to day life. Solid, dependable, silent, my bike is my horse, my fighter jet, my island, my friend. Together we will conquer that hill and thereafter the world.
Barrettscv is offline  
Old 03-12-14, 03:26 PM
  #6  
Andy_K 
Senior Member
 
Andy_K's Avatar
 
Join Date: Jan 2008
Location: Beaverton, OR
Posts: 13,982

Bikes: Yes

Mentioned: 465 Post(s)
Tagged: 0 Thread(s)
Quoted: 2743 Post(s)
Liked 2,342 Times in 957 Posts
Price may be the thing that kills the OP's plan (or at least makes it painful). For Shimano rings (as an example) it looks like the cost is around $80 for the pair. I got a CX50 crankset from Jenson USA for that cost not long ago.

On the other hand, switching to 46-34, which is what I'm running on my CX bike for gravel grinding rides, is cheap. You can get and Ultegra 34T ring for around $12.

I would expect that the market for lightly used rings is pretty good, but they might be generally worthless enough that you have to send out a WTB message to get them. I know I've got a pile of chainrings in my garage at any given time.
__________________
My Bikes
Andy_K is offline  
Old 03-12-14, 08:49 PM
  #7  
Rumpled
Senior Member
 
Join Date: Feb 2009
Posts: 906
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Both sets of those rings should be 110 BCD and can interchange at will.
I've changed both my CX bikes from 46/36 to 46/34.
If you think you might be changing back and forth, just buy rings.
If not, swapping cranks might be easier.
I've found used rings for ~$20 or so on EBay and various forums.

I've got the two 36t FSA rings that are both lightly used.
I would easily let one go for $20 or other items of need of similar value.
Rumpled is offline  
Old 03-12-14, 10:18 PM
  #8  
ModeratedUser
Banned
 
Join Date: May 2007
Posts: 974
Mentioned: 5 Post(s)
Tagged: 1 Thread(s)
Quoted: 54 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by Rumpled View Post
I've found used rings for ~$20 or so on EBay and various forums.
Wait, you're buying stuff on forums??? Which ones? I've been looking for frame and or a CX bike for ages! So far my sources has been CL, sometimes coast to coast, and ebay.
ModeratedUser is offline  
Old 03-12-14, 10:48 PM
  #9  
Rumpled
Senior Member
 
Join Date: Feb 2009
Posts: 906
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Slowtwitch.com has a very active classified forum. (Triathlete forum) Got shifters, a tribelt and cranks there.
EBay got CX frame, stem, seat post, pedals,,34t ring.
CL for an Ultegra wheel, bars and saddle.
Brakes from a member of a group on FB.
Derailleurs I bought new online, they are pretty cheap on EBay.

All but the frame and derailleurs were very budget priced.

Took many hours of searching over a couple of months.

Still looking for more Ultegra wheels and repair stand and a garmin.
Rumpled is offline  
Old 03-12-14, 11:44 PM
  #10  
ModeratedUser
Banned
 
Join Date: May 2007
Posts: 974
Mentioned: 5 Post(s)
Tagged: 1 Thread(s)
Quoted: 54 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by Rumpled View Post
Slowtwitch.com has a very active classified forum.
Slowtwitch looks pretty good. I'll keep an eye there. I'm up on my local CL here. One thing I forgot to mention was REI used gear sales are pretty good sometimes. I've gotten parts there. I picked up a returned Feedback stand for $75 that ain't bad at all. I've yet to use it, but I do have 3 bikes I have to build up.
ModeratedUser is offline  
Old 03-13-14, 12:34 PM
  #11  
fietsbob
Banned
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Posts: 43,599

Bikes: 8

Mentioned: 197 Post(s)
Tagged: 0 Thread(s)
Quoted: 7607 Post(s)
Liked 1,336 Times in 844 Posts
Out of the box , manufacturers choose for you , 36-46 is common ..

already got a 110bcd crank? get 2 chainrings of your choice for the course.
fietsbob is offline  
Old 03-13-14, 01:53 PM
  #12  
NZier
Senior Member
 
Join Date: Jul 2012
Location: Lee's Summit, MO
Posts: 90

Bikes: 2011 Cannondale Carbon Synapse (Ultegra 6800 11-spd), 2009 Blue CXC, 1979 Univega Gran Turismo

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I scope Slowtwitch from time to time as well. I bought a couple really nice ultegra cassette's on there shipped for $45, I'm going to use them on some Tubeless wheelsets (some day in the fall when I get these bikes paid up).

Chainlove (timed deal site) is a hit or miss site, but I picked up two pairs of 2013 Aksium wheelsets (with tubes and tires) shipped for like $360. (gearscan website is a decent way to track it)
NZier is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
jclark217
Bicycle Mechanics
7
02-02-16 03:25 PM
kyoto now
Road Cycling
14
11-17-13 06:33 PM
Erik_A
Cyclocross and Gravelbiking (Recreational)
15
11-05-12 01:55 PM
gus6464
Bicycle Mechanics
5
05-09-11 01:17 PM
Elantr025
Road Cycling
34
01-26-11 01:12 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 - Do Not Sell My Personal Information -

Copyright 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.