Why do I want disc brakes?
#1
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Why do I want disc brakes?
The more I see of them in use by "regular" riders in the neighborhood, the more intrigued I've become. A lot of people site a number of reasons for liking them, "more stopping power", "better modulation", better performance in the wet", etc. While that certainly piques my interest, I've got to ask, "Is the different in braking performance worth the cost of n+1?" As far as braking "power", I can lock up both wheels easily with my existing rim brakes and since I'm a fair weather pavement rider almost exclusively, performance in adverse conditions isn't much of a concern.
Mind you, it's been a looong time since I've bought a bike and the idea does excite me. So go ahead... Convince me
Mind you, it's been a looong time since I've bought a bike and the idea does excite me. So go ahead... Convince me
#2
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For me it was more about modulation than the ability to lock up a wheel (which I hope to avoid), and the greater confidence it gives me on prolonged, steep descents, as well as reducing hand fatigue from prolonged braking.
They are more expensive, more finicky to adjust and maintain, and in my case at least, I chew through pads and rotors fairly frequently, and the cost adds up.
If you have carbon rims, they are probably almost a necessity. If you ride off-road a lot, they are very reassuring to have. If you ride under wet conditions frequently, they are probably a safer option.
But remember, Occam's rotor can slit your throat.
They are more expensive, more finicky to adjust and maintain, and in my case at least, I chew through pads and rotors fairly frequently, and the cost adds up.
If you have carbon rims, they are probably almost a necessity. If you ride off-road a lot, they are very reassuring to have. If you ride under wet conditions frequently, they are probably a safer option.
But remember, Occam's rotor can slit your throat.
#3
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Personally, the only reason I would want discs is so the wheel rims don't get worn out. It seems like I'm wiping down rims fairly often to clean the rim eating grit off of them.
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rotors not only look cleaner, but I've found it easier to buy parts for that setup than the rim brake stuff. There seems to be a variety of rim brake styles that if you need a bracket, unique screw, or other fastener on short notice from servicing the pads & you drop something onto the grass, you might not be so lucky to find it locally.
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Disc brakes prevent your rims from getting worn out, especially when riding in dirty, gritty, wet environment such as gravel, dirt and snow. They also provide better braking when riding in winter weather when it's icy and snowy...Other than that there aren't really any advantages. If most of your riding is done in nice weather on clean pavement you don't need disc brakes. A properly adjusted rim brakes with good quality pads stop just as well as disc brakes.
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#6
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Another thought. If a spoke breaks and your wheel goes out of true, it would seem that a disc brake wouldn't be affected by this situation. While with a rim brake you might have to back off the adjustment (or remove a pad) just so you can ride back home.
Just speculation as I don't have disc brakes, but I have broken spokes.
Just speculation as I don't have disc brakes, but I have broken spokes.
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#7
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Another thought. If a spoke breaks and your wheel goes out of true, it would seem that a disc brake wouldn't be affected by this situation. While with a rim brake you might have to back off the adjustment (or remove a pad) just so you can ride back home.
Just speculation as I don't have disc brakes, but I have broken spokes.
Just speculation as I don't have disc brakes, but I have broken spokes.
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As someone who has disc brakes on all the bikes that I currently ride, I can say that you don't need them for fair weather pavement riding.
#9
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Because it's 2020 and you want another bike.
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#10
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"Why do I want disc brakes?" hahaha! to ensure the service department at your lbs stays busy! This week I have bled 5 hydro brakes, replaced 6 sets of pads, and replaced 4 brake sets due to the OEM being pieces of crap from the start. I hate them and love them at the same time as I make more money working on them, but they take a whole lot more time to work on than good ol' rim brakes.
Me? Had disc brakes once, no more.
Me? Had disc brakes once, no more.
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#11
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Why do you want brakes that are heavier, less aero, uglier, don't stop your bike any faster, more expensive, and that will squeal like a stuck pig? Good question.
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Another advantage of disc brakes is being able to swap wheel sizes. I swap between 700c and 650b wheels on my gravel bike. The smaller wheels allow wider tires and slightly lower gearing for rougher trails.
The broken spoke advantage is real, especially when touring. Nice not having to disconnect a brake to keep riding. discs provide better mud clearance. Discs make wheel changes quicker as well, no worry about releasing the cable to clear wide tires.
I honestly don't understand the comments about disc brakes being high maintenance. I have TRP Spyres on the gravel bike and BB7's on two others. The Spyres are the easiest brake I've ever set up, bar none. None of my brakes squeal. You do have to be careful to not get oil, even from your fingers, on the rotors. But that is not very limiting.
I don't think the discs stop any better than the rim brakes in dry conditions. Wet is a different matter.
The broken spoke advantage is real, especially when touring. Nice not having to disconnect a brake to keep riding. discs provide better mud clearance. Discs make wheel changes quicker as well, no worry about releasing the cable to clear wide tires.
I honestly don't understand the comments about disc brakes being high maintenance. I have TRP Spyres on the gravel bike and BB7's on two others. The Spyres are the easiest brake I've ever set up, bar none. None of my brakes squeal. You do have to be careful to not get oil, even from your fingers, on the rotors. But that is not very limiting.
I don't think the discs stop any better than the rim brakes in dry conditions. Wet is a different matter.
Last edited by Pop N Wood; 07-10-20 at 06:05 PM.
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#13
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I think they absolutely stop better on long, steep descents. At the very least, I feel much more confident going down a steep hill at 40+ mph with good hydraulic disc brakes than I do with any rim brake I've ever had.
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I have V brakes on an ebike. Bike hits 40 mph on the level, weights over 300# with me on it and the V brakes have zero issues dragging me to a halt. I tend to not brake much going down hill, like to save the battery
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i dont miss the days that it seemed like I was always adjusting the rim brakes every other ride. Rotors, maybe once in a couple of years? I don't ride the brakes like some might. I try to plan ahead to limit unnecessary braking.
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#16
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Why you'd want 'em:
1. you swap between 650b and 700c wheels
2. You ride in wet weather
3. You ride in dusty, muddy or otherwise gritty conditions with carbon rims
4. You do long mountain descents and want to keep your speed down with long braking efforts
5. You think it will help resale if you decide to sell the bike later
Why you wouldn't:
1. None of the above apply
2. You want the lightest bike possible
3. You want to spend less
4. You don't want to deal with hydraulics or learning maintenance on a new system
5. You ride rim brakes in the conditions you'd ride disc brakes, and you're happy with rim brakes
1. you swap between 650b and 700c wheels
2. You ride in wet weather
3. You ride in dusty, muddy or otherwise gritty conditions with carbon rims
4. You do long mountain descents and want to keep your speed down with long braking efforts
5. You think it will help resale if you decide to sell the bike later
Why you wouldn't:
1. None of the above apply
2. You want the lightest bike possible
3. You want to spend less
4. You don't want to deal with hydraulics or learning maintenance on a new system
5. You ride rim brakes in the conditions you'd ride disc brakes, and you're happy with rim brakes
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#17
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If you ride descents, there's a good case for disc breaks right there.
If you have carbon rims, there's another reason.
If you ride flats at moderate speeds, the difference in the the performance of disc brakes and rim brakes is less pronounced.
If you have carbon rims, there's another reason.
If you ride flats at moderate speeds, the difference in the the performance of disc brakes and rim brakes is less pronounced.
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If you wait another year you may not have to decide....
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My previous bike had rim brakes and I was completely happy with the braking performance. I wanted to get a gravel bike with a carbon frame, and there was no option. So, I have disk brakes. I don't know if they are worth the price, but given what else I wanted in a new bike, every bike from every manufacturer came with disk brakes. Could be that lots of people who have disk brakes have them for the same reason. In a certain category of bike, rim brakes are not an option.
#20
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My previous bike had rim brakes and I was completely happy with the braking performance. I wanted to get a gravel bike with a carbon frame, and there was no option. So, I have disk brakes. I don't know if they are worth the price, but given what else I wanted in a new bike, every bike from every manufacturer came with disk brakes. Could be that lots of people who have disk brakes have them for the same reason. Isa brakes are n a certain category of bike, rim brakes are not an option.
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And I've serviced bikes with cheap rim brakes, so I'm not shocked by their stories.
I think it's important for enthusiasts to get a glimpse of how the "other half" lives. Now, why do you want disc brakes? That's a whole nother story. Again for most people, they buy a bike that they like at a cost the're willing to pay, and will use whatever brakes came with it.
Last edited by Gresp15C; 07-10-20 at 07:22 PM.
#22
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Thread Starter
Many thanks to all who contributed!! I've had some time to think this whole thing through a bit more carefully. Truth be known, the Canyon I'm looking at has more going for it for me than just the brakes. It does offer both the low end gearing and the relaxed geometry more appropriate to my age group, what I get out of riding,, and frankly, my current abilities. It does so at a price point I can stomach on a fixed income. I'm still coming off a significant pelvic fracture, so there's time to consider options. Again, thanks y'all!
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#24
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being that you can get thousands of miles of use out of a standard rim brake setup and a well set up rim brake still performs exceptionally well, you don't neeeeed disc brakes. but upgrade-itis can be powerful. since everyone has outlined all the benefits, i'll just add a list of cons that i've had to deal with from experience on the mtb side.
- brake squeal - when you get oil on your rotors or pads you'll get a high pitched squeal any time you brake. for this reason, you should keep things clean with alcohol after every few rides. even oils from your sweat can contaminate. it's easier to clean oil off of rotors and harder to clean oil off your pads. brake squeal is also more common with higher metallic pads. brake performance is minimally affected, but the sound can get annoying.
- rotor true - probably less likely on road riding as there aren't risks of bashing your rotor against rocks or roots or crashes, but your rotors are subject to getting bent and then have to be bent back into shape. this will affect braking performance.
- bad bleeds - if you get air, foreign materials or water trapped in your hose line from a bad bleed, your braking performance will go to ****. cleaning a compromised line is a headache, but completely necessary if this happens.
- pad lock - if you take your wheel off for any long period of time (storage etc.) you need to remember to shim your pads or else they will lock closed and you'll spend an hour cussing as you work to reset your pads before your next ride.
#25
Senior Member
As it happens I have a bike which has a disc brake up front (avid BB7) and a cantilever brake at the rear (Avid Shorty Ultimate with Kool Stop dual compounds). Housings are compressionless and the cantilever is setup for maximum braking power. I prefer to use the disc up front because it just performs better. The cantilever at the back is somehow 'laggy' and it takes a fair amount of lever pressure to get proper results. The mechanical disc brake achieves more with less effort. It's not even a front brake rear brake difference kind of thing because I've had full rim brake bikes with cantilevers/others and they performed just as poorly up front. The end result is that turning left sucks because I have to signal with my left hand and brake with my right, which controls the rim brake. Yes, I could go back to full cantilever so I'd have the same amount of brakes at both hands but then turning both ways would suck. It's surprisingly unstable to ride one handed when you have to really squeeze the lever with effort.
Then I have another bike which has hydraulic discs front and back.
The difference of hydraulic disc brakes when comparing to rim brakes is like comparing the brakes of an 80's Camaro and a modern Volvo. Both get the job done (kinda) but with one getting the ABS to rattle is achieved accurately and effortlessly with one toe while with the other you need to merge with the seat to lock up one wheel on wet tarmac.
First of all the hydros are more powerful by far as in stopping with them is easier. I know the physics and once your rear wheel is off the ground that's it. But what I mean is that braking is easier in that it takes less effort to achieve full braking power but the brake is still more accurate than other brakes of the same braking power (full length vee brakes get fairly close). So to get my rear wheel to rise I don't have to have visible abs on my palm. The end result is that I can feather at the limit of braking more easily than I can with any rim brake or with mechanical disc brakes. It's weird that the feel and security I get from the hydro's with 160mm rotors is better than I got from a mechanical disc brake with a 203mm rotor.
With the hydro bike I don't have to consider which way I signal because I get the same performance from both brakes. Safer, easier and braking doesn't make me as unstable as braking with a cantilever will.
Now I'm not sure if modulation is the correct term but it might be. Hydraulic disc brakes have plenty of it. Cantilevers or other rim brakes not so much in my experience. The more strength one has to use the more one loses accurate motor control. That in turn makes braking less accurate. Every rim brake I've ever used has required more effort to achieve the same braking power than disc brakes.
Modulation is probably also a bit misunderstood as a term. But in the end it really comes down to how accurately one can control one's brakes. Lever travel has nothing to do with it. One could have zero lever travel and have great modulation whereas one could also have a full range of lever travel and and have poor modulation. As an example, highest end racing cars which do not use brake assists (Formula one) have almost immovable brake pedals, yet the brakes are accurate enough for pretty high lever racing.
For me rim brakes are an inconvenience I'd rather not deal with anymore. And I do feel safer with disc brakes.
Whether one should adhere to the N+1 rule? Yes. Yes one should.
Then I have another bike which has hydraulic discs front and back.
The difference of hydraulic disc brakes when comparing to rim brakes is like comparing the brakes of an 80's Camaro and a modern Volvo. Both get the job done (kinda) but with one getting the ABS to rattle is achieved accurately and effortlessly with one toe while with the other you need to merge with the seat to lock up one wheel on wet tarmac.
First of all the hydros are more powerful by far as in stopping with them is easier. I know the physics and once your rear wheel is off the ground that's it. But what I mean is that braking is easier in that it takes less effort to achieve full braking power but the brake is still more accurate than other brakes of the same braking power (full length vee brakes get fairly close). So to get my rear wheel to rise I don't have to have visible abs on my palm. The end result is that I can feather at the limit of braking more easily than I can with any rim brake or with mechanical disc brakes. It's weird that the feel and security I get from the hydro's with 160mm rotors is better than I got from a mechanical disc brake with a 203mm rotor.
With the hydro bike I don't have to consider which way I signal because I get the same performance from both brakes. Safer, easier and braking doesn't make me as unstable as braking with a cantilever will.
Now I'm not sure if modulation is the correct term but it might be. Hydraulic disc brakes have plenty of it. Cantilevers or other rim brakes not so much in my experience. The more strength one has to use the more one loses accurate motor control. That in turn makes braking less accurate. Every rim brake I've ever used has required more effort to achieve the same braking power than disc brakes.
Modulation is probably also a bit misunderstood as a term. But in the end it really comes down to how accurately one can control one's brakes. Lever travel has nothing to do with it. One could have zero lever travel and have great modulation whereas one could also have a full range of lever travel and and have poor modulation. As an example, highest end racing cars which do not use brake assists (Formula one) have almost immovable brake pedals, yet the brakes are accurate enough for pretty high lever racing.
For me rim brakes are an inconvenience I'd rather not deal with anymore. And I do feel safer with disc brakes.
Whether one should adhere to the N+1 rule? Yes. Yes one should.