Thread: The death of rim brakes, disc brakes now unanimous in the pro peloton...
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Old 09-21-21, 09:39 AM
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prj71
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Originally Posted by kingston
Neither of those things are true. Show me your lightest disk brake bike, and I can make a lighter one for the same money with rim brakes. The second one it's such a ridiculous claim it doesn't even warrant a response.
Disc brake wheel rims can also be made lighter than rim brake wheels. In a rim brake design, the need to handle the compressive force of the brake pads, the expansive force of the tyre and the heat generated by braking require greater strength and heat dissipation than a disc brake rim, where it’s just the tyre pressure that needs to be handled. It’s easier to optimise the rim’s aerodynamics when designing for disc brakes too.

Likewise, disc brake frames can be built differently to rim brake frames. While there’s a need to beef up the left fork leg and left-side chainstay, there’s less force acting on other parts of the frame, which can be thinned out.

The biggest advantage of rim brakes is weight. Although disc and rim brake components themselves aren’t very different weight-wise, once you add the rotor, the system weight of a disc brake setup is typically a few hundred grams greater. However, as we’ve covered in the previous section, wheels and frames for the latest generation of bikes can compensate for this.

https://www.bikeradar.com/features/r...-need-to-know/


Disc brakes can be cheaper (in the long term). Okay. We know that earlier we made the point that rim brakes are less expensive than disc brakes – but this is only true initially. As the name suggests, a rim brake calliper stops your bike by applying pressure to the rim of the wheel. When this is extrapolated over months and years, the braking surface on the rim wears out, meaning you may need to replace your wheelset every couple of seasons. Unfortunately, this can cost hundreds, if not, thousands of pounds. By contrast, a disc brake clasps onto a rotor which is comparatively far cheaper. By wearing out a rotor instead of a wheel, a disc brake system will reduce the cost of replacement parts considerably over time.

https://www.probikekit.co.uk/blog/gu...s-disc-brakes/
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