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Please explain why road bikes don't have disc brakes

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Please explain why road bikes don't have disc brakes

Old 06-06-17, 06:03 PM
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Mark42
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Please explain why road bikes don't have disc brakes

Why is it that road bikes have V brakes, and mtn have disc? Why not put disc on road bikes? I thought disc were better. I know the set of BB5 calipers on my bike weigh more than a set of V brake levers, but does squeezing the rim make up for the few grams saved over a disc? Someone must make a light weight magnesium alloy or carbon caliper that would negate that weight advantage. Or maybe I'm totally missing the relationship of brakes to bikes.

The reason I ask is because after looking at lots of alloy and carbon road frames on alibaba/aliexpress, noticed that no road bikes had IS or PM caliper mounts on the chain/seat stay. All were setup for V brake.

Last edited by Mark42; 06-06-17 at 06:11 PM. Reason: Add afterthought.
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Old 06-06-17, 06:04 PM
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What????
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Old 06-06-17, 06:06 PM
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V brakes?

Lol. Is it 1995 in your world?
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Old 06-06-17, 06:09 PM
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V-brakes on lower end MTB's and hybrids.
Caliper/rim brakes on road bikes, mostly
Disc brakes on most gravel/cross/adventure, hybrids, and some road bikes

Sorry, what exactly are you asking?
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Old 06-06-17, 06:09 PM
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The reality is that caliper and/or cantilever brakes have worked well for a century or more, and while they're npt perfect, neither are disc brakes.

Each has advantages and drawbacks, and the balance is different for road and off road applications.

So, given the proven history and discounting your erroneous assumption that disc brakes are somehow "better", a more interesting question might be, why rework road bikes to make disc brakes work on them?
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Old 06-06-17, 06:11 PM
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Although.... disc brakes on road bikes are everywhere. I am not convinced they are superior to the old rim brakes. I think (My Humble Opinion).... stopping power on my bikes are more dependent the tires than the brakes.
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Old 06-06-17, 06:14 PM
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Because disc brakes are heavier, uglier, less aero, more expensive, more mechanically complicated, and don't stop your bike any faster than calipers in most conditions.
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Old 06-06-17, 06:15 PM
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Short-pull V-brakes also on some CX bikes for a while before they mostly went disc.
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Old 06-06-17, 06:19 PM
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Originally Posted by Mark42 View Post
Why is it that road bikes have V brakes, and mtn have disc? Why not put disc on road bikes? I thought disc were better. I know the set of BB5 calipers on my bike weigh more than a set of V brake levers, but does squeezing the rim make up for the few grams saved over a disc? Someone must make a light weight magnesium alloy or carbon caliper that would negate that weight advantage. Or maybe I'm totally missing the relationship of brakes to bikes.

The reason I ask is because after looking at lots of alloy and carbon road frames on alibaba/aliexpress, noticed that no road bikes had IS or PM caliper mounts on the chain/seat stay. All were setup for V brake.
More road bikes with disc all the time. Might take a while for the China Crabon Cartel to start releasing more frames with mounts.

Here are 22 road disc options:

https://road.cc/content/buyers-guide/...-vanguard-disc
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Old 06-06-17, 06:35 PM
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"Plese explain why road bikes don't have disc brakes"

They do.

Next thread.
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Old 06-06-17, 06:37 PM
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What? lol My Jari road bike has disc brakes.
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Old 06-06-17, 06:41 PM
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I actually don't mind the look of disc brakes. I'll take my cx bike with road brakes when it's wet. They do stop better in the wet.
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Old 06-06-17, 06:46 PM
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v brakes on my cx - WHIR WHIR WHIR
calipers on my road - whoosh whoosh whoosh
discs on my MTN - squeek, squeek, squeek
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Old 06-06-17, 06:59 PM
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Originally Posted by Mark42 View Post
Why is it that road bikes have V brakes, and mtn have disc? Why not put disc on road bikes?
check back in a few years after The Tour allows disc brakes and then somebody wins with them. Then you will be an idiot not to have disc brakes on a road bike.
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Old 06-06-17, 07:07 PM
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Originally Posted by Mark42 View Post
Why is it that road bikes have V brakes, and mtn have disc?
For the same reason Bill Clinton is still the President.
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Old 06-06-17, 07:38 PM
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They do. Two of mine have discs and both are hydro. One is Dura Ace while the other is SRAM Rival. The DA is smoother and quieter and both stop and modulate better than my rim brake bikes (also two).
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Old 06-06-17, 07:54 PM
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Originally Posted by Ty0604 View Post
What? lol My Jari road bike has disc brakes.
What does your Spin bike have?
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Old 06-06-17, 08:35 PM
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Thanks to all for the short course on brakes/bikes. And a few laughs to boot. I learn something new every day.
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Old 06-06-17, 08:51 PM
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Originally Posted by indyfabz View Post
What does your Spin bike have?
It had THMs on it. Caliper brakes. I no longer have the Spin as of earlier this year though.
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Old 06-06-17, 08:54 PM
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I had to do a double take on the date of the first post in this thread.

Searching Alibaba/Aliexpress for bikes, Really?
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Old 06-06-17, 09:24 PM
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Originally Posted by Mark42 View Post
Why is it that road bikes have V brakes, and mtn have disc?
Road bikes generally don't have v brakes. Most have caliper brakes. To be more specific, most modern road bikes use dual-pivot sidepull calipers.

As for why... For one thing, caliper brakes are simple, easy to install/adjust/maintain, effective, lightweight, and cheap. Secondly, UCI, the governing body that oversees road racing, has only recently started allowing disc brakes in limited trial applications. (And there's been some pushback from CPA, the pro cyclists' union, regarding safety concerns of discs in the event of a crash.) Since consumer road bikes often parrot race bikes, adoption of discs has been slow.

Originally Posted by Mark42 View Post
Why not put disc on road bikes? I thought disc were better...
There are pros and cons. Sheldon Brown's site does a pretty decent job of discussing them:
https://www.sheldonbrown.com/disc-brakes.html
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Old 06-06-17, 09:30 PM
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Originally Posted by Ty0604 View Post
What? lol My Jari road bike has disc brakes.
I was just wondering how to pronounce that.

Jar-ree?
Hahr-ee?
Hairy?

I kinda settled on Jar-ree, and decided that it should be always be said preceded by Fuji and very quickly, so they sound like one word.
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Old 06-06-17, 09:34 PM
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Originally Posted by LesterOfPuppets View Post
I was just wondering how to pronounce that.

Jar-ree?
Hahr-ee?
Hairy?

I kinda settled on Jar-ree, and decided that it should be always be said preceded by Fuji and very quickly, so they sound like one word.
Yar-e

Yar like in "yard" and "e" as in eat

haha I'm ashamed because I graduated with a masters in communication and took an IPA class (International Phonetic Alphabet) to get my journalism/broadcasting certificates but I don't remember any of the IPA guidelines.
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Old 06-06-17, 09:37 PM
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Mine does. Culprit Croz Blade.
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Old 06-06-17, 09:41 PM
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Originally Posted by LesterOfPuppets View Post
I was just wondering how to pronounce that.

Jar-ree?
Hahr-ee?
Hairy?

I kinda settled on Jar-ree, and decided that it should be always be said preceded by Fuji and very quickly, so they sound like one word.
You mean a foo-hee?
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