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

Road disc brakes 140 or 160 or mix for CX

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.

Road disc brakes 140 or 160 or mix for CX

Old 09-18-12, 06:08 PM
  #1  
Senior Member
Thread Starter
 
Join Date: Sep 2008
Posts: 513
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 28 Post(s)
Likes: 0
Liked 8 Times in 3 Posts
Road disc brakes 140 or 160 or mix for CX

I want to add Avid BB7 road disc brakes to a Lemond Poprad disc cyclocross frameset that I bought as a frame only. I hear that some of you guys are running 140 rotors on the rear and 160 rotors on the front. This is my 1st foray into disc brakes; how do you decide on the rotor size? What are the pros and cons? Will the hardware take either 140 or 160s? I am a big guy 220 lbs, so I was assuming 160s (the bigger the better).
Erik_A is offline  
Old 09-18-12, 06:22 PM
  #2  
Senior Member
 
Join Date: May 2007
Posts: 103
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
At 140# I went with a 160/140 combo.
Stickyrunner01 is offline  
Old 09-18-12, 06:40 PM
  #3  
Senior Member
Thread Starter
 
Join Date: Sep 2008
Posts: 513
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 28 Post(s)
Likes: 0
Liked 8 Times in 3 Posts
Would Avid BB5s or Tektro Lyra disc brakes be just as effective as BB7s for cross?


I'm at 185lbs and I have no problems with running 140's in the rear. BB5's will lock up the tire just fine, don't really need any more leverage from a larger rear rotor.
Erik_A is offline  
Old 09-18-12, 09:08 PM
  #4  
Senior Member
 
Andy_K's Avatar
 
Join Date: Jan 2008
Location: Beaverton, OR
Posts: 14,777

Bikes: Yes

Mentioned: 527 Post(s)
Tagged: 0 Thread(s)
Quoted: 3253 Post(s)
Liked 3,946 Times in 1,461 Posts
I don't think Avid even makes an adapter to use a 140 on the front.

Near as I can tell, the only advantage to 140's is the weight. You get more braking force with bigger rotors, and I think they modulate better for that reason.

I've got 140 Tektro Lyras front and rear on my 2013 Kona Jake. I haven't used it for cross racing, but I think they'd do OK. They've been great for just commuting. The biggest complaint I have about the Lyras is that the rotors tend to get little wobbles in them that make them scrape periodically. For commuting, that's just an annoyance. For racing, it might cost you some momentum here and there.

If I were buying brakes for a cross bike, I would definitely get the BB7's with 160 front/140 rear rotors.
__________________
My Bikes
Andy_K is offline  
Old 09-19-12, 09:53 AM
  #5  
Team Beer
 
Cynikal's Avatar
 
Join Date: Apr 2004
Location: Sacramento CA
Posts: 6,341

Bikes: Too Many

Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 116 Post(s)
Liked 160 Times in 105 Posts
I would get the BB7's with the 160/140 split. From what I've read (this is my only experience) this is what most people are doing.
__________________
I'm not one for fawning over bicycles, but I do believe that our bikes communicate with us, and what this bike is saying is, "You're an idiot." BikeSnobNYC
Cynikal is offline  
Old 09-19-12, 11:17 AM
  #6  
Banned
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Posts: 43,598

Bikes: 8

Mentioned: 197 Post(s)
Tagged: 0 Thread(s)
Quoted: 7607 Post(s)
Liked 1,357 Times in 863 Posts
Generally the same adapter is common , between a 140 on the Rear,
and a 160 on the front.

buy a 'Road' set, that is what they ship.

likewise R-160, F-180, the adapters are often marked saying that.

Last edited by fietsbob; 09-19-12 at 11:21 AM.
fietsbob is offline  
Old 09-19-12, 05:25 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
I am running dual 160s on my race bike. I weigh 175ish. It's fine and doesn't feel out of balance.

160 is a more common size, so you can find a replacement more easily in a pinch.

I would run what your brakes come with and see if that's adequate. If piecing together a system dual 160s doesn't seem like a bad way to go at your size.
marqueemoon is offline  
Old 09-19-12, 07:34 PM
  #8  
Senior Member
Thread Starter
 
Join Date: Sep 2008
Posts: 513
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 28 Post(s)
Likes: 0
Liked 8 Times in 3 Posts
thanks guys
Erik_A is offline  
Old 09-23-12, 11:33 AM
  #9  
George Krpan
 
Join Date: Jan 2007
Location: Westlake Village, California
Posts: 1,708
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
Likes: 0
Liked 1 Time in 1 Post
160/140 f/r didn't work for me with BB5s, I weigh 200. Changing to 185/160 and changing to Jaguar pads was a tremendous improvement. The Avid pads are way too soft.
GeoKrpan is offline  
Old 09-23-12, 12:26 PM
  #10  
Banned
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Posts: 43,598

Bikes: 8

Mentioned: 197 Post(s)
Tagged: 0 Thread(s)
Quoted: 7607 Post(s)
Liked 1,357 Times in 863 Posts
That On dirt and Turf or on the street? .. original Avid pads seem OK,
but I'm not trying to lock up a rear wheel to do a skid turn.

been knob twiddling for a year, as the pads wear, so Ill consider another pad
before too many more years..
fietsbob is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Jarrett2
Bicycle Mechanics
151
04-03-15 04:48 PM
chefisaac
Clydesdales/Athenas (200+ lb / 91+ kg)
8
12-02-11 07:19 PM
Arcanum
Utility Cycling
8
11-01-10 08:45 AM
mtalinm
Commuting
11
10-15-10 08:50 PM
nyc_commuter
Commuting
7
03-14-10 08:13 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.