Go Back  Bike Forums > Bike Forums > Cyclocross and Gravelbiking (Recreational)
Reload this Page >

newbie: rear derailleur and gearing!

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.

newbie: rear derailleur and gearing!

Old 09-08-12, 06:50 AM
  #1  
Senior Member
Thread Starter
 
Join Date: Jan 2010
Location: Ypsilanti, MI
Posts: 376
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
newbie: rear derailleur and gearing!

Hello!

I just got my first cx bike and recently went to a local cx clinic to learn how to mount, dismount, etc.

Anyway...my bike currently has a road compact 50/34 up front. And a 12-27 cassette in the rear. Is this ok? To be honest, I wished I had a larger cog during the cx clinics 40 minute post instructional race! Also...I have a SRAM XX rear derailleur. Should I swap that out for a SRAM road derailleur? Or keep the mountain derailleur on it?

Thanks!
teamtrinity is offline  
Old 09-08-12, 07:45 AM
  #2  
Senior Member
 
Join Date: Oct 2009
Location: Sherwood, OR
Posts: 1,279
Mentioned: 29 Post(s)
Tagged: 0 Thread(s)
Quoted: 336 Post(s)
Liked 309 Times in 180 Posts
What you have is fine.

A larger cog in the back would only get used, and you don't want that in a race. If you need lower gearing for the steep stuff, you should probably be running anyway.

A mountain RD will probably be more durable that an RD, so any difference in performance or weight wouldn't be noticeable.
aggiegrads is offline  
Old 09-08-12, 09:39 AM
  #3  
Senior Member
 
Join Date: Jul 2007
Posts: 2,119
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
That gearing is fine. At some point you might want chainrings that are more closely spaced. The hot combo these days is 36/46. 50/34 is such a big jump that it's not terribly usable in a race.
flargle is offline  
Old 09-08-12, 11:43 AM
  #4  
Senior Member
Thread Starter
 
Join Date: Jan 2010
Location: Ypsilanti, MI
Posts: 376
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by flargle
That gearing is fine. At some point you might want chainrings that are more closely spaced. The hot combo these days is 36/46. 50/34 is such a big jump that it's not terribly usable in a race.
Gotcha! So you think the SRAM mtb derailleur is fine? Is there any reason to swap out for a road derailleur/

Thanks!
teamtrinity is offline  
Old 09-08-12, 11:54 AM
  #5  
Senior Member
 
Andy_K's Avatar
 
Join Date: Jan 2008
Location: Beaverton, OR
Posts: 14,800

Bikes: Yes

Mentioned: 527 Post(s)
Tagged: 0 Thread(s)
Quoted: 3271 Post(s)
Liked 3,999 Times in 1,475 Posts
I've always found that (for me) even 46-36 isn't useful, mostly because I never need the 46. I've gone with a 1x10 setup. I've been using a 36 in front, but I feel like it allows me to be too slow (CX races have a way of moving you into your lowest gear) so I'm swapping in a 38. My biggest concern about 50-34 would be that I'd spend too much time in the 34-27 gear.
__________________
My Bikes
Andy_K is offline  
Old 09-08-12, 01:55 PM
  #6  
Senior Member
 
Join Date: Jul 2007
Posts: 2,119
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by teamtrinity
So you think the SRAM mtb derailleur is fine?
Oh, sure.
flargle is offline  
Old 09-21-12, 06:01 PM
  #7  
or tarckeemoon, depending
 
marqueemoon's Avatar
 
Join Date: Dec 2005
Location: the pesto of cities
Posts: 7,017

Bikes: Davidson Impulse, Merckx Titanium AX, Bruce Gordon Rock & Road, Cross Check custom build, On-One Il Pomino, Shawver Cycles cross, Zion 737, Mercian Vincitore, Brompton S1L, Charge Juicer

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Originally Posted by Andy_K
I've always found that (for me) even 46-36 isn't useful, mostly because I never need the 46. I've gone with a 1x10 setup. I've been using a 36 in front, but I feel like it allows me to be too slow (CX races have a way of moving you into your lowest gear) so I'm swapping in a 38. My biggest concern about 50-34 would be that I'd spend too much time in the 34-27 gear.
I agree with the above. My lowest gear is 39x25. After that I have to HTFU. There's no sustained climbing in cross. Yes, it hurts on lap 5 but one way or another it's over pretty quickly.

Only bad thing about a MTB rd is it's longer so it can snag on stuff, but it's paid for, so ride it.
marqueemoon is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
1/8 kid
Bicycle Mechanics
3
05-29-12 09:34 AM
teamtrinity
Road Cycling
2
02-17-11 09:32 AM
Steve90068
Bicycle Mechanics
42
01-28-11 09:02 PM
jmeans53
Bicycle Mechanics
9
08-22-10 08:19 PM

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.