Go Back  Bike Forums > Bike Forums > Mountain Biking
Reload this Page >

140mm rear disc, am I the only one?

Mountain Biking Mountain biking is one of the fastest growing sports in the world. Check out this forum to discuss the latest tips, tricks, gear and equipment in the world of mountain biking.

140mm rear disc, am I the only one?

Old 05-16-09, 03:27 PM
  #1  
ponchotempest
[CTRL Z]
Thread Starter
 
ponchotempest's Avatar
 
Join Date: Dec 2005
Location: NJ
Posts: 135

Bikes: DBR xts-3, Interloc hardtail (Reynolds 853), old trek 820, Salsa LaRaza, Guerciotti

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
140mm rear disc, am I the only one?

So I just set up my hardtail with 160/140 front/rear BB7 brakes, and after one ride I am very happy. After a short break-in the 140mm rear seemed great even with a real grippy 2.1" tire. Is anyone else running 140 rotors with mountain calipers?


Last edited by ponchotempest; 05-16-09 at 06:36 PM.
ponchotempest is offline  
Old 05-16-09, 03:50 PM
  #2  
ed 
.
 
ed's Avatar
 
Join Date: Oct 2005
Location: The Summit of Lee
Posts: 10,940

Bikes: Hecklah

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I would never admit to it if I was...I'd never live that one down.
ed is offline  
Old 05-16-09, 03:56 PM
  #3  
ponchotempest
[CTRL Z]
Thread Starter
 
ponchotempest's Avatar
 
Join Date: Dec 2005
Location: NJ
Posts: 135

Bikes: DBR xts-3, Interloc hardtail (Reynolds 853), old trek 820, Salsa LaRaza, Guerciotti

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Well before i was using 203/160 front/rear with an '01 SID fork. That was a little too flexy for 203...
ponchotempest is offline  
Old 05-16-09, 03:57 PM
  #4  
ed 
.
 
ed's Avatar
 
Join Date: Oct 2005
Location: The Summit of Lee
Posts: 10,940

Bikes: Hecklah

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
So you're saying now you have plenty of braking power...but not so much as to flex the dickens outta the SID?

I've been told that some 140mm rear rotors are much, much quieter than some 160mm rear rotors...on some frames, and if you don't live in an area with a ton of DH where you'll make it glow...you may as well go with the smaller ones.

Last edited by ed; 05-16-09 at 04:40 PM.
ed is offline  
Old 05-16-09, 05:47 PM
  #5  
ponchotempest
[CTRL Z]
Thread Starter
 
ponchotempest's Avatar
 
Join Date: Dec 2005
Location: NJ
Posts: 135

Bikes: DBR xts-3, Interloc hardtail (Reynolds 853), old trek 820, Salsa LaRaza, Guerciotti

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I have more braking power than grip in the rear it seems. The 160's weren't to noisy before except for the occasional squeal when muddy. I'll have to go for a nice muddy ride with the 140 to test that out.

With a 203mm rotor that SID would flex so much that the brakes would rub while cornering on pavement. That was quite the overkill.
ponchotempest is offline  
Old 05-16-09, 05:51 PM
  #6  
Lebowski
bikes are sexy
 
Lebowski's Avatar
 
Join Date: Apr 2008
Location: Sheboygan area, WI
Posts: 599

Bikes: [2008 specialized allez tripple], [2006 Specialized hardrock sport], [1998 Robinson Rebel], [1980's vintage schwinn ministing], [2008 specialized epic comp] - [2009 origin8 scout 29er], [2005 KHS DJ200]

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
im running the 185/160 but i want to go to 185/185. it bugs me that my rear rotor is smaller than the dork disc on my cassette
Lebowski is offline  
Old 05-16-09, 05:52 PM
  #7  
Pocko
Senior Member
 
Join Date: Dec 2008
Location: Under the Downunder
Posts: 1,014

Bikes: MTBs, BMX, Pocket MTB

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by ponchotempest View Post
So I just set up my hardtail with 160/140 front/rear BB7 brakes, and after one ride I am very happy. After a short break-in the 140mm rear seemed great even with a real grippy 2.1" tire. Is anyone else running 140 rotors with mountain calipers?
I use 140mm calipers, but on a smaller wheel - not on a 26" wheel.

Just curious as to why you opted for a 140 at the rear instead of the usual 160. Did you do it so that it would minimize rear wheel lock? If you're planning to run "skinnier" tires than the 2.1 on the rear, this makes even more sense.

A smaller rotor would theoretically be more likely to overheat during prolonged braking, but if you hardly do that in your style of riding, then a 140 would probably hold-up as well as a 160 rotor...

Out of intererst, is your 140 an original Avid rotor? I'm interested in the rotor shape... any pics?


.
Pocko is offline  
Old 05-16-09, 06:34 PM
  #8  
ponchotempest
[CTRL Z]
Thread Starter
 
ponchotempest's Avatar
 
Join Date: Dec 2005
Location: NJ
Posts: 135

Bikes: DBR xts-3, Interloc hardtail (Reynolds 853), old trek 820, Salsa LaRaza, Guerciotti

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
It still locks up pretty easy with the 140, but obviously not quite as easy as 160. I'm not really worried about overheating anything on this bike, it only weighs about 25 lbs or so.

Its an Avid Roundagon rotor, but i'm not sure if they sell the 140mm rotor with a mountain caliper as a package. I could be mistaken, though.
ponchotempest is offline  
Old 05-16-09, 06:35 PM
  #9  
ponchotempest
[CTRL Z]
Thread Starter
 
ponchotempest's Avatar
 
Join Date: Dec 2005
Location: NJ
Posts: 135

Bikes: DBR xts-3, Interloc hardtail (Reynolds 853), old trek 820, Salsa LaRaza, Guerciotti

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by Lebowski View Post
im running the 185/160 but i want to go to 185/185. it bugs me that my rear rotor is smaller than the dork disc on my cassette
Naw, it's bigger than my 32t 1st gear
ponchotempest is offline  
Old 05-16-09, 06:38 PM
  #10  
ed 
.
 
ed's Avatar
 
Join Date: Oct 2005
Location: The Summit of Lee
Posts: 10,940

Bikes: Hecklah

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by Lebowski View Post
im running the 185/160 but i want to go to 185/185. it bugs me that my rear rotor is smaller than the dork disc on my cassette
Invest in a 0mm dork disc.
ed is offline  
Old 05-16-09, 07:02 PM
  #11  
ed 
.
 
ed's Avatar
 
Join Date: Oct 2005
Location: The Summit of Lee
Posts: 10,940

Bikes: Hecklah

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
ed is offline  
Old 05-16-09, 07:05 PM
  #12  
ca7erham
****** (can I say this?)
 
Join Date: Jun 2008
Location: CO
Posts: 1,900
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
^^^^
We really need to stage an intervention.
ca7erham is offline  
Old 05-16-09, 07:08 PM
  #13  
ed 
.
 
ed's Avatar
 
Join Date: Oct 2005
Location: The Summit of Lee
Posts: 10,940

Bikes: Hecklah

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I had my own reasons.
ed is offline  
Old 05-16-09, 07:12 PM
  #14  
ponchotempest
[CTRL Z]
Thread Starter
 
ponchotempest's Avatar
 
Join Date: Dec 2005
Location: NJ
Posts: 135

Bikes: DBR xts-3, Interloc hardtail (Reynolds 853), old trek 820, Salsa LaRaza, Guerciotti

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
thats 140 rear?

Heres mine before with the big brakes:
ponchotempest is offline  
Old 05-16-09, 08:16 PM
  #15  
ca7erham
****** (can I say this?)
 
Join Date: Jun 2008
Location: CO
Posts: 1,900
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by chelboed View Post
I had my own reasons.
It just seems like you came 180 compared with 6 months ago

But I really do like your bike. Whatever works, right?
ca7erham is offline  
Old 05-16-09, 08:44 PM
  #16  
kenhill3
use your best eye
 
kenhill3's Avatar
 
Join Date: Mar 2006
Location: Olympia, Washington
Posts: 3,058

Bikes: '75 Bertin, '93 Parkpre Team 925, '04 Kona King Kikapu, '05 Bianchi Vigorelli

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by ponchotempest View Post
that SID would flex so much that the brakes would rub
Your SID was flexy? Unbelievable.
__________________
"I tell you, We are here on earth to fart around, and don't let anybody tell you any different." - Kurt Vonnegut jr.
kenhill3 is offline  
Old 05-16-09, 08:46 PM
  #17  
kenhill3
use your best eye
 
kenhill3's Avatar
 
Join Date: Mar 2006
Location: Olympia, Washington
Posts: 3,058

Bikes: '75 Bertin, '93 Parkpre Team 925, '04 Kona King Kikapu, '05 Bianchi Vigorelli

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

I know you're a big fellah, but.............there's something wrong with your seatpost..........it's bent.
__________________
"I tell you, We are here on earth to fart around, and don't let anybody tell you any different." - Kurt Vonnegut jr.
kenhill3 is offline  
Old 05-16-09, 09:43 PM
  #18  
DirtPedalerB
unofficial roadie
 
DirtPedalerB's Avatar
 
Join Date: Jul 2006
Location: Out in the woods you see
Posts: 1,440

Bikes: 2004 Marin bobcat trail, 2006 trek fuel ex7, 2007 iron horse road bike

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
you need some more cable ties on that top tube
DirtPedalerB is offline  
Old 05-16-09, 09:51 PM
  #19  
Pocko
Senior Member
 
Join Date: Dec 2008
Location: Under the Downunder
Posts: 1,014

Bikes: MTBs, BMX, Pocket MTB

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by kenhill3 View Post
Your SID was flexy? Unbelievable.
In general, quick-release forks with 10mm drop-outs should be fitted with 185mm rotors as max. Larger 203mm rotors are better suited for forks with 20mm thru-axles.
Pocko is offline  
Old 05-16-09, 09:54 PM
  #20  
kenhill3
use your best eye
 
kenhill3's Avatar
 
Join Date: Mar 2006
Location: Olympia, Washington
Posts: 3,058

Bikes: '75 Bertin, '93 Parkpre Team 925, '04 Kona King Kikapu, '05 Bianchi Vigorelli

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Sids have never been known to be flexy.
__________________
"I tell you, We are here on earth to fart around, and don't let anybody tell you any different." - Kurt Vonnegut jr.
kenhill3 is offline  
Old 05-16-09, 10:37 PM
  #21  
rhyno
Member
 
Join Date: Mar 2008
Location: Edmond, ok
Posts: 35

Bikes: 80's raleigh (fixy) GF tassajarra and hoffman mantra

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
i have one question. How is the pad placement on the disk, are they fully contacting the disk or partially?
rhyno is offline  
Old 05-17-09, 03:38 AM
  #22  
born2bahick
Official Website Waterboy
 
born2bahick's Avatar
 
Join Date: Dec 2004
Posts: 3,271

Bikes: a lot

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
A friend with an 08 Epic, "Dealer Edition" in red. has a 140 rear. It's got all the stopping power a rear brake needs in this area.
born2bahick is offline  
Old 05-17-09, 06:34 AM
  #23  
ed 
.
 
ed's Avatar
 
Join Date: Oct 2005
Location: The Summit of Lee
Posts: 10,940

Bikes: Hecklah

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
+1

Oh my crap...I woke up...and my sig... BWAHAHAHAHA!

That's classic!

Originally Posted by DirtPedalerB View Post
you need some more cable ties on that top tube
Yah...it's a bit of overkill.

Last edited by ed; 05-17-09 at 11:31 AM.
ed is offline  
Old 05-17-09, 07:40 AM
  #24  
sscyco
Fool O' crap
 
sscyco's Avatar
 
Join Date: Jul 2002
Location: spokane
Posts: 1,230

Bikes: Are faster than yours.

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I ran a 140 (XTR centerlock) on the rear of my old Litespeed - rear disk conversion - it was the only disk that would fit my frame. Ran it for a year with no issues.
__________________
sscyco is offline  
Old 05-17-09, 02:58 PM
  #25  
ponchotempest
[CTRL Z]
Thread Starter
 
ponchotempest's Avatar
 
Join Date: Dec 2005
Location: NJ
Posts: 135

Bikes: DBR xts-3, Interloc hardtail (Reynolds 853), old trek 820, Salsa LaRaza, Guerciotti

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by rhyno View Post
i have one question. How is the pad placement on the disk, are they fully contacting the disk or partially?
They contact the disc properly as long as you have the correct adapter.
ponchotempest is offline  

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.