Rim or disc brakes for mountain biking?

Disc brakes are brakes the braking surface of which is composed of a disc which is fixed to the hub. The disc, originally from the automobile and motorcycle industry, also finds increasing application in cycling.

What types of disc brakes are there?

In principle there are two distinct types of disc brakes: mechanical and hydraulic.
  • Mechanical disc brakes: The transfer is done as with cantilever via a Bowden cable. Well-known manufacturers are Promax, Avid, Hayes, Shimano and Tektro.
  • Hydraulic disc brakes: here, the ability of brake lever is transmitted to the brake caliper by means of a brake fluid. If brake fluid mineral oils or used brake fluid DOT known from the automobile industry. Manufacturers include: Grimeca, Hayes, Formula, etc.)..

Semi Hydraulic disc
The brakes never really have not put through because they both are just as expensive as a hydraulic brake, but on the other hand do have the disadvantages of a mechanical disc brake. The control is up to the caliper by means of cables, and only then from the brake piston hydraulically operated. Because of the very long brake cable these brakes can only be operated with a lot of manual force, they are sensitive to dirt and the braking force is worse to dose.

Advantages and disadvantages of the schijfremtechnologie

The advantages and disadvantages of schijfremtechnologie prove especially when comparing the most used alternative, the rim brake.
Benefits disc
  • always optimal braking performance, even in wet conditions and on snow and ice, there is no reduction in braking power as is the case with rim brakes;
  • no heating of the rims: damage caused by overheated wheels during braking, can be avoided with disc brakes. This works especially well when riding with a small wheel diameter as with recumbents. Note: The drives can be very hot, so do not touch!
  • no wear of the wheels: unlike rim brakes are disc brakes at the wheels, which above all have a bearing function, no longer used as part of the brake. By Worn rims have at least not for disc;
  • less manual effort needed: to achieve the same braking effect will suffice for disc with less manual effort than rim brakes;
  • a slap in the rear wheel does not affect the braking in the disc. You can go home with a working brake bikes.

Disadvantages disc
  • price: disc brakes are generally more expensive than rim brakes;
  • the weight: disc are generally heavier than simple mechanical rim brakes. However, they are usually lighter than hydraulic rim brakes;
  • repair: damage to hydraulic disc brakes only possible with a service kit from the manufacturer. This also applies for hydraulic rim brakes, but not for mechanical disc brakes;
  • Sound: with certain discs you always hear a slight grinding noise while driving. And other disc that occurs after replacing the brake pads. For a perfect freewheel careful assembly and special tools;
  • voltage on the spokes: disc cause by a different manner of force transmission a greater load on the spokes than rim brakes;
  • vulnerability: the vulnerability allows the disc to topple the bike or in its transport, easy to bend.

Choosing the right disc

A disc brake which is overloaded, overheats and subsequently loses its braking force, something which is known under the name of fading. Point of attention, especially the diameter of the disc. The larger the drive, the longer you can brake heavily. The heavier the bicycle, and the more you are dependent on continuous braking the greater must be the disc. Who can usually do without continuous braking power, has no problems with overheating and has free choice.
Fork must fit pulley diameter
Any specified weight limit should certainly be followed by the manufacturer. Because the braking force to disc brakes throughout the fork goes, one should also always pay their attention to the specifications. Especially in large pulley diameters you have to convince you that the fork is suitable. Not every fork is approved for large brake discs. In older models may no larger brake discs fitted thereon in doubt. But all in all is a clear recommendation for the selection of disc brakes to give hard.

Using the correct brake fluid

The advantage of brake fluid driven braking is the ability to buy brake fluid stations. In brakes with mineral oils may be used under any condition DOT, while ?? DOT brakes ?? the reverse is true. Mineral oils have the advantage that they do not age, so less maintenance.

How should you clean disc?

Oils and fats may under no circumstances come into contact with the brake disc. As a result, loss of braking force, as possible even total failure. Small impurities affect the braking few and their influence will diminish over time. Is the loss of stopping power greater than can clean the discs with industrial alcohol, spritus or soapy. Important: Always remove the brake pads before working on carrying out the hydraulic system!