Go Back  Bike Forums > Bike Forums > General Cycling Discussion
Reload this Page >

Shimano Introduces "Warp Resistant" Road Disc Rotors

Notices
General Cycling Discussion Have a cycling related question or comment that doesn't fit in one of the other specialty forums? Drop on in and post in here! When possible, please select the forum above that most fits your post!

Shimano Introduces "Warp Resistant" Road Disc Rotors

Old 07-05-22, 09:13 AM
  #26  
PoorInRichfield
Senior Member
Thread Starter
 
Join Date: Nov 2013
Location: Richfield, WI
Posts: 631

Bikes: Trek Domane SL7 Disc, Trek Boone 9, Cannondale F29

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 348 Post(s)
Liked 257 Times in 157 Posts
Originally Posted by NoWhammies View Post
I am up for warp resistant rotors. Where I live we have a LOT of mountains/hills. On those descent my rotors, specifically my front, tend to warp. Of course once they cool down the rotors return to their normal state.
This is the common complaint with Shimano (and perhaps other brands) and has been my experience as well. Where I live, it seems to be cool to put a stop sign at the very bottom of a hill. As a result, I'm on my brakes really hard to come to a complete stop and when I start moving again, one or both rotors start rubbing for a while which eventually goes away. It's my understanding that the new 12 speed Shimano group brakes have a very slight increase in pad gap distance to reduce the rubbing noise caused by the tight pad clearance.
PoorInRichfield is online now  
Likes For PoorInRichfield:
Old 07-06-22, 07:11 AM
  #27  
BlazingPedals
Senior Member
 
BlazingPedals's Avatar
 
Join Date: Dec 2004
Location: Middle of da Mitten
Posts: 12,262

Bikes: Trek 7500, RANS V-Rex, Optima Baron, Velokraft NoCom, M-5 Carbon Highracer, Catrike Speed

Mentioned: 14 Post(s)
Tagged: 0 Thread(s)
Quoted: 1424 Post(s)
Liked 632 Times in 394 Posts
Where can you get these mythical $2 rotors?
BlazingPedals is offline  
Old 07-06-22, 05:04 PM
  #28  
Racing Dan
Senior Member
 
Racing Dan's Avatar
 
Join Date: Aug 2015
Posts: 2,103
Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 1242 Post(s)
Liked 274 Times in 186 Posts
Shimano rotors tend to be a complex construction of a alloy spider, rivets and and a sandwich brake rotor. All with different temperature expansion coefficients. Im sure a simple 6 bolt, single piece, stainless rotor would be less prone to warping.
Racing Dan is offline  
Old 07-06-22, 10:40 PM
  #29  
t2p
Senior Member
 
Join Date: May 2022
Location: USA
Posts: 935

Bikes: Cannondale - Gary Fisher - Litespeed - Schwinn Paramount - Schwinn (lugged steel) - Trek OCLV

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 365 Post(s)
Liked 367 Times in 245 Posts
Originally Posted by Racing Dan View Post
Shimano rotors tend to be a complex construction of a alloy spider, rivets and and a sandwich brake rotor. All with different temperature expansion coefficients. Im sure a simple 6 bolt, single piece, stainless rotor would be less prone to warping.
Shimano offers inexpensive one piece rotors

Shimano claims the three layer rotors (aluminum core between steel plates) with aluminum carrier manage heat more efficiently

because aluminum dissipates heat better than steel - I'm going to side with the Shimano engineers

Last edited by t2p; 07-06-22 at 10:45 PM.
t2p is offline  
Old 07-06-22, 10:43 PM
  #30  
t2p
Senior Member
 
Join Date: May 2022
Location: USA
Posts: 935

Bikes: Cannondale - Gary Fisher - Litespeed - Schwinn Paramount - Schwinn (lugged steel) - Trek OCLV

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 365 Post(s)
Liked 367 Times in 245 Posts
Originally Posted by BlazingPedals View Post
Where can you get these mythical $2 rotors?
at the dollar store

problem is you only get 1/2 rotor
t2p is offline  
Old 07-07-22, 08:40 AM
  #31  
Racing Dan
Senior Member
 
Racing Dan's Avatar
 
Join Date: Aug 2015
Posts: 2,103
Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 1242 Post(s)
Liked 274 Times in 186 Posts
Originally Posted by t2p View Post
Shimano offers inexpensive one piece rotors

Shimano claims the three layer rotors (aluminum core between steel plates) with aluminum carrier manage heat more efficiently

because aluminum dissipates heat better than steel - I'm going to side with the Shimano engineers
Thats fine, however bonding metals with different coefficient of thermal expansion is very much likely to produce warping in the presence of heat. The principle is used in a long variety of mechanical and electrical contraptions exactly for that reason. Shimano may be able to out engineer the effect, but reducing warping sure is a lot easier in a single piece brake disc.

https://en.wikipedia.org/wiki/Bimetallic_strip
Racing Dan is offline  
Old 07-07-22, 12:59 PM
  #32  
Atlas Shrugged
Senior Member
 
Join Date: Mar 2010
Posts: 882
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 565 Post(s)
Liked 694 Times in 334 Posts
Originally Posted by Racing Dan View Post
Thats fine, however bonding metals with different coefficient of thermal expansion is very much likely to produce warping in the presence of heat. The principle is used in a long variety of mechanical and electrical contraptions exactly for that reason. Shimano may be able to out engineer the effect, but reducing warping sure is a lot easier in a single piece brake disc.

https://en.wikipedia.org/wiki/Bimetallic_strip
Your internet sleuthing missed a key point, BiMetal does not have the corresponding material on the other side of this the warping. Given the design I would state that the trimetal design is actually more stable than a solid disk. Much like a sheet of plywood is more stable than a single plank.
Atlas Shrugged is online now  
Old 07-08-22, 10:18 PM
  #33  
NoWhammies
Senior Member
 
NoWhammies's Avatar
 
Join Date: Jul 2017
Location: Pacific Northwest
Posts: 1,849

Bikes: Argon 18 Gallium, BH G7, Rocky Mountain Instinct C70

Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 754 Post(s)
Liked 464 Times in 273 Posts
I don't know. I am no engineer but I think the engineering Shimano has done behind the Ice-tech rotors is pretty damn amazing.
NoWhammies is offline  
Likes For NoWhammies:
Old 07-09-22, 07:18 AM
  #34  
Racing Dan
Senior Member
 
Racing Dan's Avatar
 
Join Date: Aug 2015
Posts: 2,103
Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 1242 Post(s)
Liked 274 Times in 186 Posts
Originally Posted by Atlas Shrugged View Post
Your internet sleuthing missed a key point, BiMetal does not have the corresponding material on the other side of this the warping. Given the design I would state that the trimetal design is actually more stable than a solid disk. Much like a sheet of plywood is more stable than a single plank.
Then again, If the design was inherently balanced and warp resistant, then why would Shimano have to redesign and market an improved, warp resistant design that is "Designed to significantly reduce heat deformation during long, steep descents". Shimano discs was always a triple sandwich, that clearly isn't inherently warp resistant. Quite the contrary. Warping/pinging and delamination are common complaints, that are likely to originate in the sandwich of dissimilar metals.

Last edited by Racing Dan; 07-09-22 at 07:29 AM.
Racing Dan is offline  
Old 07-09-22, 09:06 AM
  #35  
Atlas Shrugged
Senior Member
 
Join Date: Mar 2010
Posts: 882
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 565 Post(s)
Liked 694 Times in 334 Posts
Originally Posted by Racing Dan View Post
Then again, If the design was inherently balanced and warp resistant, then why would Shimano have to redesign and market an improved, warp resistant design that is "Designed to significantly reduce heat deformation during long, steep descents". Shimano discs was always a triple sandwich, that clearly isn't inherently warp resistant. Quite the contrary. Warping/pinging and delamination are common complaints, that are likely to originate in the sandwich of dissimilar metals.
With the exception of the Fender Stratocaster or perhaps a traditional mousetrap most products are in some form of constant improvement this would be a example of this. I never indicated that the Shimano Rotor could not be improved, only a laminate is usually more stable the a solid. I also pointed out the bimetal example is irrelevant because the rotor clearly is not. If solid rotors are preferred by some that is great however Shimano has produced millions of the IceTech rotors with very good market acceptance.
Atlas Shrugged is online now  
Old 07-09-22, 09:12 AM
  #36  
Polaris OBark
ignominious poltroon
 
Polaris OBark's Avatar
 
Join Date: Jan 2022
Posts: 1,987
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 1127 Post(s)
Liked 1,651 Times in 917 Posts
I think what some people interpret to be transient rotor warping is instead failure of a piston to fully retract, which can usually be resolved by one or two additional short sharp squeezes on the brake lever.
Polaris OBark is offline  

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 © 2022 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.