50 votes
Accepted

What is the difference between I.S., post, and flat mount disc brake mounting standards?

IS mounts (also frequently called IS tabs, disc tabs, etc) are unthreaded eyelets 51mm apart that bolts run through parallel with the hub axle. In almost all cases the brake caliper is then bolted to ...
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25 votes
Accepted

6-bolt vs centre-lock: pros and cons?

Centerlock largely exists because since the beginning of modern disc brakes for bikes, Shimano has more or less alone had a weird cautionary take on the physics of rotor bolts theoretically being able ...
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22 votes
Accepted

Is having a disc brake on a single speed bicycle a bad idea?

Well, there are lot's and lot's of commuter bikes with internal hubs and disk brakes. I see no reason why a single speed wouldn't work as well. A google search for "single speed cx bike disk brakes"...
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21 votes

Is disk brake effectiveness mitigated by tyres losing traction under strong braking?

Ideally, the brakes should be able strong enough to break traction otherwise you will not be able to brake maximally (i.e., just before the threshold of losing traction). Rim brakes can do this, even ...
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  • 29.8k
19 votes
Accepted

How to install round brake pads

You got the wrong pads. While it's possible to mix and match some pads, this is usually not the case. When replacing pads, keep track of: Pad material and what your rotor is compatible of. Some ...
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18 votes
Accepted

V-brake vs hydraulic disk-brake - which is more environmentally friendly

We can assume that V-brake pads are essentially non-degradable. The same is true for resin disc pads. But are non-recyclable. Metal disc pads seem to be various copper alloys which are probably OK ...
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  • 46.2k
17 votes

Can a bike have both rim and disc brakes?

If you are asking one of each type on the bike, yes. As disc brakes were becoming popular, many companies produces bikes with a disc in the front and a rim brake in the rear. If you are asking ...
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  • 9,858
16 votes

Why are disk brakes not completely round on the outside?

For the brakes to self clean and remain effective, the surface of the pad must transition from metal to void at least once every revolution across the entire pad (i.e. no continuous line of metal). ...
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  • 40k
16 votes
Accepted

Is there way to fix a disc brake rotor if slightly bent?

Yes. Disc brake rotors can warp a little in use, or get bent from impacts and straightening them is routine maintenance. The basic procedure is to find spots where the rotor is bent inboard or ...
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16 votes
Accepted

I know I am missing a rotor but I don't know what to attach it to

You will need a wheel with a hub that is rotor compatible and fits your bike. There are two main ways to mount a disk brake rotor to the hub. A Shimano centerlock design has splines on the hub to ...
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  • 16.2k
15 votes

Can my fork support disc brakes?

In order to fit a disc brake, you need a compatible fork and a compatible wheel, plus a compatible brake lever. Your fork does have a disc brake mounting already designed in, it is an International ...
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  • 12k
15 votes

I mistakenly put WD40 for my disc brakes and now pads not anchoring as well as before. Any solution?

Disc brake pads are very sensitive to contamination. You can clean the disc rotors with rubbing alcohol, but that's about it. Anything else will contaminate the pads. You may not be able to restore ...
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  • 24.1k
15 votes

Can't get enough braking power after lots of adjustment

Render R's are very susceptible to the arm being over-actuated. They don't hit a physical stop like some of their peers, but they reach a point where the cable anchor location is hanging in space and ...
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15 votes

Accident from front wheel locking up on brand new bike

Re: When I tried to spin the front wheel, it just popped out of the frame. I was NOT applying any force and it just came straight off This suggests the quick release was not properly attached or ...
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  • 2,433
14 votes

Disc brakes better for rainy days?

Disc brakes are generally more effective in the rain than rim brakes, but using rim brakes properly in the rain has served people well for many years. You need to feather the brakes to remove the ...
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  • 45.5k
14 votes
Accepted

What does this piece do that came with my disc brake?

These things are called tightening plates or lock washers. Your suggestion was righ in where it goes, here's an exploded diagram and installed photo:
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14 votes

6-bolt vs centre-lock: pros and cons?

Advantages of 6-bolt: Not being patented by Shimano means more vendors offer compatible wheels/disks. Torx bolts require a smaller tool which is often included in many multi-tools so one can always ...
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14 votes

Disk brakes swap on a new road bike with rim brakes

Can I put disk brakes on it? No. You cannot effectively convert a rim brake frame or forks to disc brakes. (Alternative answer: do I need to replace parts? Yes, the frame and forks.) Seriously ...
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14 votes

Is it normal that front wheel bends when front disk brakes are applied?

No, not normal at all. You should have a bike shop look at it for a safety check if you are new to the sport and bike. One thing that can cause a wheel to bend is poor spoke tension. A good bike shop ...
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14 votes
Accepted

How do bicycle brake manufacturers balance their products' physical limitations?

There is more to it than the 3 factors you describe beyond just the conversion of one force to another. A few others: The deflection of the linkages in braking. A flimsy brake caliper will ...
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  • 11.7k
13 votes

Hydraulic Vs. Mechanical disc brakes

Cable discs rule if you are riding a lot of third world. I am a million miles away from a shop, access to the oil, etc. A hydraulic failure would be disaster, whereas the worst thing that will happen ...
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  • 131
13 votes

Are rotor bolts designed to shear?

Low-profile button-cap socket screws do have a design weakness. The button reduces the amount of material around the head and the recessed hex or Torx socket also does the same, exactly at the ...
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  • 28.5k
13 votes
Accepted

Can I convert a rim brake wheel to a disc brake wheel?

The hub for a disc brake wheel has the mounting for the brake rotor machined into the left side, and has shorter spokes that side to make room for the brake. If the eBay wheels are for rim brakes, ...
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  • 12k
12 votes

Is there a wheel which can use both disc brakes and rim brakes?

Rim brakes need an appropriate braking surface on the rim -- if you apply rim brakes to a rim which doesn't have an appropriate braking surface, it'll wear down the rims quickly to be unsafe to ride ...
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  • 45.5k
12 votes

6-bolt vs centre-lock: pros and cons?

A couple more pros of centre lock: Finned rotors One big difference is that you can't get the finned Shimano Ice-Tech rotors used on the road bike groupsets in a 6-bolt configuration. E.g: or I'...
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  • 281
12 votes

Why do my bicycle brakes get worse and feel more 'squishy" over time?

On most cable disc brake systems there's a moving pad and a fixed pad. The moving pad presses against the rotor and bends it slightly towards the fixed pad. The rotor is made of rather springy steel,...
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  • 46.2k
12 votes
Accepted

Removing wd40 from disk brakes

The rotor needs thorough degreasing, finishing with alcohol to ensure there is no residue. The trick is that when there's actual oil on it, you should use something nasty like brake cleaner, but then ...
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12 votes

V-brake vs hydraulic disk-brake - which is more environmentally friendly

The world is full of perfectly good cantis, v-brakes, and rim brake wheels that sit unused since disc has taken over. Using what we've already produced for its actual full service life is pretty hard ...
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11 votes

How to replace Avid BB7 brake pads in "new" calipers?

There is a trick: The pads need some "persuasion" to get past the spring clip. Here is a side view of the pads and the spring clip showing how the pads nest within the steel clip. This should make ...
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  • 441
11 votes
Accepted

Disc brake equipped time trial bikes in grand tour

The main reason is the 2020 Specialized Shiv provided by their sponsor is only produced in a disc version. You can see an article about the bike here: https://www.bikeradar.com/news/specialized-...
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  • 14.5k

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