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Disc brakes are now the default on road bikes – and no one cares

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Disc brakes are now the default on road bikes – and no one cares

Old 02-26-20, 01:02 PM
  #376  
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Originally Posted by kingston View Post
There's one hill on Sheridan road but they closed it to bikes in the 80's claiming too many bike crashes. True story.
I finally went up Sheridan into Wisconsin last year for the first time in many years. Worst ride of the season. Constant close calls. I thought for sure I was eventually going to be hit or shot.
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Old 02-26-20, 01:07 PM
  #377  
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Originally Posted by WhyFi View Post
I didn't, really - for whatever reason, the new set of Ultegra levers/calipers came with metal pads installed, so I figured I'd give em a chance and use em.

Side note: I hope these things get considerably better after they bed in, because their stopping power is ass compared to resin so far.
I've gone to both ends with compounds. Soft for performance then stripping them because our muddy races would just blow them out and I was sick of swapping them all the time. So all to metallic. Bedded in they are great but yeah...almost have to warm them up first before they really start to bite. So back to resins.

This is all mostly with SRAM. With Shimano just about everything works great right out of the box.
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Old 02-26-20, 01:08 PM
  #378  
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Originally Posted by Psimet2001 View Post
This is the thing that always makes me roll my eyes back when people start with "Disc brakes are stronger". Uh... the largest rotor you can have is a rim.
Yes, the rim is the largest rotor you can have, but it has to work as a braking surface while fulfilling its other functions. I think the biggest potential benefit of disc brakes is the freedom to design rims without the constraints of having to accommodate brake tracks. You could optimize rims and brakes for their respective roles, without compromise.
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Old 02-26-20, 01:10 PM
  #379  
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Originally Posted by HTupolev View Post
Not exactly. Higher leverage means that you can get more clamping force for a given hand grip force, but it also means there's less pad engagement for a given lever travel. High-leverage v-brake setups can have a higher risk of bottoming out the lever against the bars before maximal braking is achieved, unless everything about the setup is very stiff and everything is very true and set close.

Cantilevers can be more prone to housing compression since the shorter pulls produce more cable tension, but if that's stiff, a good canti setup can produce quite a lot of clamping and fork flex. Case in point, check out these pads on the Tektro CR720s on my Campeur:



I foolishly set them up flat to the rim, and they went ahead and toed themselves in fairly dramatically. And that's not just in the brake mechanism: the flex under strong braking forces is clearly visible in the front rack, which has its upper mounts on the canti posts.

Interestingly, I see much less of that effect on the Deore T610 v-brakes on my gravel bike, which also gets a lot of hard stops on paved use. Those brakes also feel quite stiff without any boosting despite having very high mechanical advantage, but they're on a very beefy frameset, originally an early-80s MTB.
Hmmm....looks like a crappy fork then. Too much flex.

CR720s are OK. I stopped messing around with mid range cantis a long time ago though. Pretty much it is Avid Shorty Ultimates or it's not worth it. Couple these with Yokozuna Reaction brake housings and you can rip a fork or a brake bridge off any frame and actually stop well.
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Old 02-26-20, 01:10 PM
  #380  
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Originally Posted by Psimet2001 View Post
This is the thing that always makes me roll my eyes back when people start with "Disc brakes are stronger". Uh... the largest rotor you can have is a rim. "Give me a lever long enough and I can move the world."

... The contact patch is the weak link
People aren't riding 28s and 32s with rim brakes, but those are pretty common with discs, and the bigger tires make a bigger contact patch. Disc wins again!
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Old 02-26-20, 01:12 PM
  #381  
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Originally Posted by Psimet2001 View Post
373g is over 3/4 of a pound.

People used to argue with me that they HAD to use alloy nipples because an extra 18g on a wheelset was going to be way too much.
but some people argue that they add 1-2 pounds.

I upgraded my wheelset/tires, and lost that weight.
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Old 02-26-20, 01:13 PM
  #382  
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Originally Posted by tyrion View Post
Disc brakes can be beautiful, sleek and elegant if done properly.

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Old 02-26-20, 01:16 PM
  #383  
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Originally Posted by Seattle Forrest View Post
People aren't riding 28s and 32s with rim brakes, but those are pretty common with discs, and the bigger tires make a bigger contact patch. Disc wins again!
*sideeye* we ride 28's and 32's with rim brakes all the time... Remember canti's are rim brakes. Around here the cross scene is so bike we have all had our "gravel" bikes for over a decade now and many are still knocking around cantis...
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Old 02-26-20, 01:18 PM
  #384  
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Originally Posted by tomato coupe View Post
Yes, the rim is the largest rotor you can have, but it has to work as a braking surface while fulfilling its other functions. I think the biggest potential benefit of disc brakes is the freedom to design rims without the constraints of having to accommodate brake tracks. You could optimize rims and brakes for their respective roles, without compromise.
You realize I was able to introduce a new disc specific cyclocross rim this last season, right? I know about what rim brakes do to carbon already and the nice things that having disc brakes allow you to do with rim shape.
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Old 02-26-20, 02:08 PM
  #385  
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Originally Posted by Psimet2001 View Post
I finally went up Sheridan into Wisconsin last year for the first time in many years. Worst ride of the season. Constant close calls. I thought for sure I was eventually going to be hit or shot.
The 15 miles between Northwestern and Ft. Sheridan is one of my favorite stretches of road in Chicago. I'll see a couple-hundred riders on a nice Saturday morning in the summer. North of Great Lakes sucks.
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Old 02-26-20, 02:12 PM
  #386  
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Originally Posted by kingston View Post
The 15 miles between Northwestern and Ft. Sheridan is one of my favorite stretches of road in Chicago. I'll see a couple-hundred riders on a nice Saturday morning in the summer. North of Great Lakes sucks.
Yeah and right at Great lakes is when I cut in- heading north. I was in Lake Bluff for the race that day and decided to take a ride for myself. Used the North Shore Century route as I had ridden that a decade before and remembered it being fine.
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Old 02-26-20, 02:56 PM
  #387  
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Originally Posted by Seattle Forrest View Post
People aren't riding 28s and 32s with rim brakes, but those are pretty common with discs, and the bigger tires make a bigger contact patch. Disc wins again!
My new Seven RedSky with Grand Cru mid-reach calipers. Currently running 28c but room for 35c. Brakes feel great--running compressionless housing. I will admit I haven't ridden down hill in the rain yet. No huge descents around here unless I head to the White Mountains. I will try that this summer and report back. Hope I don't die!!

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Old 02-26-20, 03:04 PM
  #388  
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I just flushed my Shimano discs . I just bought this bike...a 2016 6.9 Domane and it is a little under maintained so I figured flushing is good. It turns out flushing was really needed.

Picture ! is now but picture 2 is what was in there...it was about time I would say.


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Old 02-26-20, 03:26 PM
  #389  
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Originally Posted by Psimet2001 View Post
*sideeye* we ride 28's and 32's with rim brakes all the time... Remember canti's are rim brakes. Around here the cross scene is so bike we have all had our "gravel" bikes for over a decade now and many are still knocking around cantis...
Cantis 4 life!
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Old 02-26-20, 03:44 PM
  #390  
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Originally Posted by bykemike View Post
I just flushed my Shimano discs . I just bought this bike...a 2016 6.9 Domane and it is a little under maintained so I figured flushing is good. It turns out flushing was really needed.

Picture ! is now but picture 2 is what was in there...it was about time I would say.


FWIW some shimano factory kits came with yellow mineral oil without the red dye, tripped me up on one of my new bikes when I had to shorten the line on a brand new system. The discoloring is probably from dirt getting past the piston seals. If you clean them off regularly before pushing the pistons back in when changing pads etc it stays cleaner for a lot longer
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Old 02-26-20, 05:19 PM
  #391  
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Originally Posted by tyrion View Post
Disc brakes can be beautiful, sleek and elegant if done properly.

Sure. You are kidding right?

Try this instead:
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Old 02-26-20, 07:20 PM
  #392  
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Originally Posted by Psimet2001 View Post
You realize I was able to introduce a new disc specific cyclocross rim this last season, right? I know about what rim brakes do to carbon already and the nice things that having disc brakes allow you to do with rim shape.
Sorry, I'm not familiar with your product line. I hope your cross wheels have been well received.
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Old 02-26-20, 08:37 PM
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Originally Posted by noodle soup View Post
this is an example of how not to do it, right?
Originally Posted by Johnk3 View Post
Sure. You are kidding right?
Sometimes the camera has a difficult time capturing the true elegance of those brakes.
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Old 02-26-20, 09:19 PM
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Originally Posted by tyrion View Post
Sometimes the camera has a difficult time capturing the true elegance of those brakes.
I don't think discs will ever look elegant like this.



but at least they can look sleek.

Last edited by noodle soup; 02-26-20 at 09:33 PM.
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Old 02-26-20, 10:00 PM
  #395  
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Originally Posted by Psimet2001 View Post
373g is over 3/4 of a pound.

People used to argue with me that they HAD to use alloy nipples because an extra 18g on a wheelset was going to be way too much.
Not because they were enlightened, but because weight weenie marketing told them 1/2 oz is significant, when its really not.
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Old 02-26-20, 10:20 PM
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Originally Posted by tyrion View Post
Sometimes the camera has a difficult time capturing the true elegance of those brakes.
You are a master of the understatement.
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Old 02-27-20, 08:33 AM
  #397  
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Originally Posted by edscott. View Post
Here's a picture of the rear brake, where you can see the tight clearance. If you don't believe that it won't fit a 25 mm, well...


Pro tip- braking will improve significantly if you install a brake cable..
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Old 02-27-20, 09:39 AM
  #398  
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Originally Posted by noodle soup View Post
I don't think discs will ever look elegant like this.


There are a lot of elegant and sleek road brakes out there, those aren't one of them, the term chunky comes to mind. I've got some old modolos that would fit the definition better IMHO.

Originally Posted by Seattle Forrest View Post
People aren't riding 28s and 32s with rim brakes, but those are pretty common with discs, and the bigger tires make a bigger contact patch. Disc wins again!
It's easy to run those on a number of road calipers, the first season I decided to try cross I some green vittoria 32s on my road bike of the time and ran with ultegra calipers. Did fine the first 3 races till the wet season really hit though the mud clogged the frame just as quickly as the calipers. If the frame went slightly out of true the rim and tire still had no problem clearing the brakes but the frame was the limiting factor. Disc is really allowing for the wider rims to run bigger tires to greater advantage without having to mess with the brake geometry of Vs or Cantis which could have pad clearance/leverage issues with a wider rim.

Originally Posted by Psimet2001 View Post
373g is over 3/4 of a pound.

People used to argue with me that they HAD to use alloy nipples because an extra 18g on a wheelset was going to be way too much.
Alloy is all about the color, weight is just the bonus. I can remember people worrying about the weight and being one of those people. Now I build all my/my families' wheels with nipples from wheel fanatyk since I really like adding the colors while the spline are a lot easier to get to tension with no effort. Something I liked when I learned to build in the late 90s and spline was first available.
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Old 02-27-20, 09:57 AM
  #399  
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Originally Posted by Russ Roth View Post
There are a lot of elegant and sleek road brakes out there, those aren't one of them.
Incorrect.
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Old 02-27-20, 10:27 AM
  #400  
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Originally Posted by kingston View Post
The 15 miles between Northwestern and Ft. Sheridan is one of my favorite stretches of road in Chicago. I'll see a couple-hundred riders on a nice Saturday morning in the summer. North of Great Lakes sucks.
That's not in Chicago.

I liked to stay south of 18th St.
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