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HomeCyclingThe Velo ORANGE Weblog: Disc Brakes 101

The Velo ORANGE Weblog: Disc Brakes 101


by Scott

Disc brakes have actually made main inroads into highway biking since they have been first launched about 15 years in the past. The place as soon as the thought of a highway bike utilizing disc brakes was laughable, we have now reached the purpose the place a big proportion of highway bikes include disc brakes. We might executed a weblog submit in regards to the professional/cons of disc brakes awhile again, so we’re not right here to rehash an outdated argument, however moderately attempt to clarify what you should get when it comes to brakes and bits if you wish to construct up a brand new bike that takes disc brakes.

Let’s begin with the mounting fashion of the brake caliper. That is the important thing to purchasing the appropriate components to your bike. There are three foremost kinds you may examine: IS, Put up, and Flat mount. In your bike’s description, it ought to state what kind of disc brake system the body and fork makes use of.

Body and Fork Mounts

  • IS mount makes use of an unthreaded tab welded to the body or fork. “IS brakes” don’t exist anymore. The Polyvalent and Piolet use IS mounts. What you should purchase is a post-mount brake and an IS adaptor to your rotor dimension. Typically talking, whenever you select the rotor, use the adapter the corporate who makes the rotor suggests. 
  • Put up mounts are welded tabs which have inside threading. The brake screws proper into the mount within the body. You get adaptors to account for the scale of the rotor. These have been designed for mountain bikes, so you will get adapters to work with rotors from 160 mm to 203 mm. Our Neutrino mini velo makes use of this method for the rear brake and an IS for the entrance.

  • Flat mount is flush/flat with the chain keep or fork. It was designed for highway and gravel bikes however is making its method into MTB. Typical rotor sizes are both 140 and 160 mm. Our Cross Hunter has flat mount brakes.

Shifting on to Calipers…

There are usually two kinds of caliper. The primary is single piston, the place one facet strikes the brake pad and pushes the rotor towards the opposite pad on the alternative facet of the caliper. The opposite is twin piston the place a single arm actuates pistons on either side of the rotor (extra like your automobile’s brakes). Both is okay, however we desire to make use of twin piston for extra constant put on and efficiency of brake pads and rotors.

There are a number of forms of actuation amongst disc brakes. Maybe the most typical are mechanical, cable-actuated calipers. These are good for swapping cockpits and brake elements. Alternatively, you can even get hydraulic brake calipers. These supply higher stopping energy and higher modulation, although you usually cannot combine and match elements from completely different corporations, and even sequence from the identical firm. There are additionally extra specialised instruments for set up because you’re coping with hydraulic fluid. The third sort is a cable actuated brake with a hydraulic reservoir. One of these brake presents the good thing about with the ability to combine and match calipers and brake levers, whereas additionally providing higher stopping energy and modulation than an ordinary mechanical caliper. Merely put:

  • Cable actuated: straightforward to put in and repair, capable of combine and match, good braking
  • Hydraulic actuated: more durable to put in and repair because you want specialised instruments, basically no capacity to combine and match, superior efficiency and modulation
  • Cable actuated with hydraulic reservoir: straightforward to put in and repair, capable of combine and match, nice braking, although extra cumbersome than the opposite choices due to the added reservoir

And Rotors…

The rotor is the precise disc that the brake caliper pinches to permit you to cease. Typically talking, when selecting rotor dimension, bigger rotor equals higher warmth elimination and higher stopping over brief/intense braking (MTB) and longer downhill braking. Smaller rotor equals much less weight and fewer components. Typically talking, the bikes we constructed fluctuate between 160mm or 180mm relying on the applying and bike. The following dimension up is 203mm, however that’s fairly solely for MTB and downhill.

Rotors are available in two mounting kinds – 6 bolt (on left) or middle lock (on proper). 6 bolt is the fashion we use on our hubs. The large benefit to six bolt is which you can simply take away the rotor in case you are packing the bike up or want to switch the rotor out within the wilds of Iceland’s inside, utilizing solely a T25 Torx head wrench.

The middle lock system, which is primarily used and licensed by Shimano, makes use of a middle spline with a lock ring to maintain the rotor in place. You want a cassette lockring instrument plus an excellent dimension wrench to get it off. That is good for set up however is a ache for touring.

Lastly Adaptors…

So let us take a look at a fork to get an thought of the components wanted for it. This fork makes use of IS mounts, so we went with a set of Put up mount TRP Spyres and the mounts for a 160 mm rotor. Discover that the fork mount is unthreaded, and the adaptor is threaded in two instructions: left and proper to connect the caliper to the fork mount, and back and front to connect the caliper to the adaptor.

Flat mount is a little bit completely different. For the body, you want bolts that move by means of the body and screw into the caliper. Relying on the body design, it’s possible you’ll not want any shims for a 140mm rotor. For a 160mm rotor, you may very seemingly want one. For the entrance, it additionally screws instantly into the fork and makes use of a particular mount. Some brake units include the entire {hardware} and others do not include any (and you must purchase a la cart). 

Put up mount is the best because the caliper screws instantly into the body or fork mount. It is best to solely want shims to accommodate the rotor dimension.

So, these are the fundamentals of disc brakes! You are welcome to debate the professionals and cons of every fashion of brake mount within the feedback or inform us what kind of arrange you have used in your disc brake bike construct. 

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