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-   -   Question about disc brakes (https://www.bikeforums.net/commuting/943801-question-about-disc-brakes.html)

Andy_K 05-01-14 03:19 PM


Originally Posted by spare_wheel (Post 16718119)
erm...no.
a bike magazine beta-tested crappy road hydraulics on a steep descent in hawaii and the reviewer admitted dragging the brakes the whole time.

Surely you're not saying that idiots misusing their equipment isn't a real world condition.

PaulRivers 05-01-14 04:00 PM


Originally Posted by spare_wheel (Post 16718122)
they don't work well.

Lol, yeah, unfortunately that's the major problem - noteably less stopping power with drum brakes. I've also read that they made removing the wheel (say, if you got a flat) a much, much larger pain than with traditional brakes.

Not that these make drum brakes completely useless, but they are big drawbacks.

spare_wheel 05-01-14 04:05 PM


Originally Posted by PaulRivers (Post 16719686)
Lol, yeah, unfortunately that's the major problem - noteably less stopping power with drum brakes. I've also read that they made removing the wheel (say, if you got a flat) a much, much larger pain than with traditional brakes.
Not that these make drum brakes completely useless, but they are big drawbacks.

i think drum brakes a good choice for someone who does not mind the weight, rides a relatively flat route, and does not get flats. in fact, for that use case they are probably a better choice than disc brakes.

fietsbob 05-01-14 04:13 PM

over 25 years and the SA drum brakes have zero service and never needed pads

and the only adjustment was when I put the wheel back in

then its simple turn the barrel adjuster in till the wheel wont turn, then back it out just as far as it take till ir will

true all the marketing money, and adrenaline sports are about disc brakes ..

simplicity and reliability are not as sexy .. ..

dynaryder 05-01-14 04:24 PM

In the real world,you need to do something abusive to blue your discs or boil your fluid. In reality,you're going to have a much better chance of tacoing a wheel in a pothole or bad curb hop than you will in trashing your discs.

Roller brakes suck. Period. They're heavy,don't work well,and are a pain to install/remove. I mention this because they get confused with proper drum brakes all the time. I personally wouldn't run drums because I live in a very hilly area,but if you're somewhere flattish and are looking for minimal maintenance,then drum brakes are ok.

fietsbob 05-01-14 04:34 PM

Washington DC may have a little rolling elevation change , but out west , where the 'hills' spew out volcanic ash .

and bury whole towns with an occasional mudslide , I'm harder to impress . I've visited there..

New Hampshire and North Carolina holiday in the Appalachian range , then you may be able to make different claims ..

PaulRivers 05-01-14 04:45 PM


Originally Posted by spare_wheel (Post 16719690)
i think drum brakes a good choice for someone who does not mind the weight, rides a relatively flat route, and does not get flats. in fact, for that use case they are probably a better choice than disc brakes.

There's no one who "does not get flats", however, I agree it's possible that they have their use if you live somewhere where you can catch a bus/call a taxi/call a friend if you do get a rare flat, and you ok with exchanging the low long term cost and lack of maintenance in exchange for needing to hit the brakes sooner.

Disc brakes can definitely be fiddly annoying - they make noise if they get wet, they tend to rub a little if you're taking the front wheel on and off. I prefer rim brakes for summer riding, but as others have pointed out for winter riding they'll wear down your rim. Drum brakes sound like the lowest maintenance - but they do have their drawbacks.

krobinson103 05-01-14 09:47 PM

Centering a disc caliper takes two minutes and two bolts. No a big issue.

byrd48 05-01-14 09:52 PM


Originally Posted by spare_wheel (Post 16718122)
they don't work well.

Just like that? They don't stop? Are they hard to adjust? How don't they work well, I'm curious

spare_wheel 05-01-14 10:13 PM


Originally Posted by PaulRivers (Post 16719817)
There's no one who "does not get flats".

I think the people who are attracted to drum brakes often run wider tires which are much less prone to flats. In the 80s when I commuted on mtbs I would go many years without a flat on my commuter.

spare_wheel 05-01-14 10:18 PM


Originally Posted by byrd48 (Post 16720544)
Just like that? They don't stop? Are they hard to adjust? How don't they work well, I'm curious

stopping power is lower than decent rim or disc brakes. the modulation is also often very soft/mushy.

jyl 05-01-14 10:25 PM

Aren't drum brakes also heavier?

krobinson103 05-01-14 11:21 PM

The drum brakes on my wife's shopping cruiser are horrible, but I'd blame it on the bike being cheap and most everything being sub par rather than the brake design. My 50cc scooter has drums front and back and they are quite effective.

TransitBiker 05-02-14 02:53 AM


Originally Posted by jrickards (Post 16717848)
Might oil also stick to pads? If so and if rubbing alcohol can remove oil from the rotors, I wonder what can clean oil off pads.

With oil not much can be done, it can soak into the pad material depending on the material used. My friend got oil splashed by a broken hose from a car that was on a drag strip in the next lane over & he had to change his pads out to get stopping power back.

Interestingly enough, yesterday i rode a bike i bought for a friend years ago. Its way too small and needs its shift mechanism tuned up, but i used it to ride out into the park nearby & observe the effects of local flooding. The rim brakes worked pretty well even when 100% submerged in silty water....


http://i975.photobucket.com/albums/a...pspwsxmhnj.jpg
http://i975.photobucket.com/albums/a...ps7kgaswuq.jpg
http://i975.photobucket.com/albums/a...psbnpnilub.jpg Water was over the path past here & didnt wanna risk getting stuck in the muck.


Rode through this... it was 3-4 inches deep.
http://i975.photobucket.com/albums/a...ps3fyklgth.jpg

I may put a disc on rear of my new bike, but not sure yet.

- Andy

TransitBiker 05-02-14 03:17 AM


Originally Posted by fietsbob (Post 16718359)
If the owner-mechanic is clueless ...


or expects their brakes always to stop them as abrubtly as a stick in your wheel, or running head-on into a wall



the old Arai tandem drum brake was very large and had a really big heatsink all around the drum.

it was brake number 3 on tandems a companion to rim brakes ..

Purpose was add some drag on downhills rather than stopping , the cantilever brakes were for stopping

This guy?

http://4.bp.blogspot.com/-Eu6onbG6g_.../drumbrake.jpg

- Andy

john.b 05-02-14 07:14 AM


Originally Posted by TransitBiker (Post 16720866)
The rim brakes worked pretty well even when 100% submerged in silty water....

How fast were you going?

fietsbob 05-02-14 08:26 AM


Originally Posted by TransitBiker (Post 16720878)

Yea those .. I'm supposing it's a Bike Friday Tandem.. or triple..

Now that the Arai Drum is not available, they have gone to using a drum brake hub in the front wheel , + rim , probably V brakes ..

AlTheKiller 05-02-14 09:28 AM


Originally Posted by PaulRivers (Post 16719817)
There's no one who "does not get flats", however, I agree it's possible that they have their use if you live somewhere where you can catch a bus/call a taxi/call a friend if you do get a rare flat, and you ok with exchanging the low long term cost and lack of maintenance in exchange for needing to hit the brakes sooner.

Disc brakes can definitely be fiddly annoying - they make noise if they get wet, they tend to rub a little if you're taking the front wheel on and off. I prefer rim brakes for summer riding, but as others have pointed out for winter riding they'll wear down your rim. Drum brakes sound like the lowest maintenance - but they do have their drawbacks.

Drum brakes might be a pain, but they're definitely not a "call a cab because I got a flat" pain... More of a ten second cuss fest as you mess with getting the brake unhooked

PaulRivers 05-02-14 02:16 PM


Originally Posted by AlTheKiller (Post 16721621)
Drum brakes might be a pain, but they're definitely not a "call a cab because I got a flat" pain... More of a ten second cuss fest as you mess with getting the brake unhooked

That sounds a lot like a "after extensive training in the olympic sport of drum brake removal, the gold medalist was able to remove it in 10 seconds" kind of answer.

From a quick search, here's a guy who had to go to 4 bike shops to find a guy who had the right tool to remove his drum brake -
http://www.bikeforums.net/tandem-cyc...e-removal.html

dynaryder 05-02-14 04:42 PM


Originally Posted by fietsbob (Post 16719787)
Washington DC may have a little rolling elevation change

Yeah,ok. :rolleyes:

Nebraska/Loughboro,Mass Ave,Wisc Ave...yeah,rolling hills.

TransitBiker 05-02-14 11:12 PM


Originally Posted by john.b (Post 16721192)
How fast were you going?

10 mph? Any faster and the naked (no fender) tires would have soaked me good. I also rode faster on the non-flooded parts with wet wheels & it was slightly diminished from dry, but i could still make the back tire skid.

I think the trick is to mentally extend your stopping distance based on conditions.

- Andy

Mr IGH 05-03-14 06:34 AM

I've been riding SA drums since the early 80's. They work better than rim brakes including v-brakes and the newer 90mm SA hub has braking modulation and power comparable to BB7s. The dyno/drum ends up weighing the same as a dyno/disc set-up once the weight of a disc fork is included.


Originally Posted by PaulRivers (Post 16722630)
That sounds a lot like a "after extensive training in the olympic sport of drum brake removal, the gold medalist was able to remove it in 10 seconds" kind of answer.

From a quick search, here's a guy who had to go to 4 bike shops to find a guy who had the right tool to remove his drum brake -
http://www.bikeforums.net/tandem-cyc...e-removal.html

This is silly, It takes a little longer to line up the torque arm into the bracket in the front and rear. No different than a coaster brake, no big deal for anyone with simple mechanical abilities....

As for bluing rotors, I've done it every year when MTB'ing in Jamaica. Some of the steepest trail grades are on the island and they are long. I can't imagine a road that could blue rotors because they're graded for cars.

http://images2.snapfish.com/23232323...A7549239ot1lsi

spare_wheel 05-03-14 10:50 AM


They work better than rim brakes including v-brakes
i was surprised to see how many riders in the recent cross crusade series were sporting sturmey archer drum brakes on their lugged steel steeds.

:rolleyes:

PaulRivers 05-03-14 12:08 PM


Originally Posted by Mr IGH (Post 16724167)
This is silly, It takes a little longer to line up the torque arm into the bracket in the front and rear. No different than a coaster brake, no big deal for anyone with simple mechanical abilities....

Sure, I'm sure 3 different shops who could figure it out all had the problem that they didn't have any mechanics there! (lol, right)

Mr IGH 05-03-14 01:24 PM


Originally Posted by PaulRivers (Post 16724803)
Sure, I'm sure 3 different shops who could figure it out all had the problem that they didn't have any mechanics there! (lol, right)

Are you suggesting it takes special tools and skills? Just because you haven't ever used it doesn't prove it sucks.

PaulRivers 05-03-14 03:38 PM


Originally Posted by Mr IGH (Post 16724960)
Are you suggesting it takes special tools and skills? Just because you haven't ever used it doesn't prove it sucks.

You might try actually reading the post I posted.

Mr IGH 05-03-14 04:11 PM


Originally Posted by PaulRivers (Post 16725297)
You might try actually reading the post I posted.

I went to a bike store to have them remove a freewheel, nobody there had ever worked on one. I had to find to remover on their bench and show them how to do it. Does that make freewheel sucky too?

I have the very drum you've cited, the solution is explained in the only reply to your cited thread. The Akai drum threads on, it's not rocket science and you don't remove the drum to fix a flat. Some 19 year old minimum wage wrench can't figure it out, you never rode or worked on a drum, so drums suck.

Makes perfect sense!

PaulRivers 05-03-14 08:37 PM


Originally Posted by Mr IGH (Post 16725380)
I went to a bike store to have them remove a freewheel, nobody there had ever worked on one. I had to find to remover on their bench and show them how to do it. Does that make freewheel sucky too?

I have the very drum you've cited, the solution is explained in the only reply to your cited thread. The Akai drum threads on, it's not rocket science and you don't remove the drum to fix a flat. Some 19 year old minimum wage wrench can't figure it out, you never rode or worked on a drum, so drums suck.

Makes perfect sense!

Well, since it's "no big deal for anyone with simple mechanical abilities", let's go through the possibilities:
1. You were really drunk and wandered into a walgreens, thinking it was a bike shop
2. You fell asleep watching tv and got a tv episode confused with a half awake dream
3.
The "bike shop" you went into is a front for a money laundering or drug dealing organization...for your own safety, I highly suggest you go somewhere else for bike repairs!




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