What size rotors do you recommend?

Discuss light weight issues concerning road bikes & parts.
joejack951
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Joined: Fri Feb 18, 2005 6:50 pm
Location: Wilmington, DE

by joejack951

Nikoras wrote:
Thu Dec 12, 2019 5:02 am
joejack951 wrote:
Mon Dec 09, 2019 5:04 pm
I still think anyone 'cooking' a 140mm rear rotor on the road needs to evaluate how they brake.
Nah, if you're riding unfamiliar roads with big descents and poor visibility it will happen. No need to be a dick about it.
I've talked with quite a few 'experienced' cyclists who think the rear brake is the best one to use to stop quickly. I'm not saying you're one of them but in the past it has benefited the discussion to mention that the front brake is the more effective one to use. If you already know this, my apologies for coming off like a dick. I should work harder at re-reading my post to avoid sounding dick-ish.

dricked
Posts: 187
Joined: Tue Jan 09, 2018 1:57 pm

by dricked

I ride 140mm rotors at 80kg. The terrain is rolling hills with no technical decents (unfortunately) so the rotors don’t really get a workout. A few hard stops after 60-70km/h hills and stop signs and they work just fine.

Obviously terrain/rider weight dictate rotor size.

icantaffordcycling
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Joined: Wed Jan 09, 2019 5:03 am

by icantaffordcycling

Image
From VeloNews

Does anyone know if these are a Shimano part or a custom part? I am guessing that if they were a Shimano part more teams would be using them but it looks like it just replaces the stock flat-mount adaptor. Looking at the 360 view on the Merida site, it doesn't look like it comes with the reacto or sulctura.

Nefarious86
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by Nefarious86

They would be specific to the frame.

As for rotors I find at 180lb 160/140 gives a nice balanced feel without having an easily overpowered rear brake.

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TobinHatesYou
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Joined: Mon Jul 24, 2017 12:02 pm

by TobinHatesYou

Merida has been using those fins for at least 2 years.

One thing that was pointed out to me last weekend by one of icantaffordcycling’s teammates is how fat the carrier arms are on the Shimano DA rotors compared to those of the SRAM Centerline XRs.

spdntrxi
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Joined: Sat Jul 20, 2013 6:11 pm

by spdntrxi

icantaffordcycling wrote:
Thu Jan 23, 2020 7:41 pm
Image
From VeloNews

Does anyone know if these are a Shimano part or a custom part? I am guessing that if they were a Shimano part more teams would be using them but it looks like it just replaces the stock flat-mount adaptor. Looking at the 360 view on the Merida site, it doesn't look like it comes with the reacto or sulctura.
looks more like a fairing to me... but I guess if you dont call it a fairing it's more likely to approved by the UCI.

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Dan Gerous
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Joined: Sun Aug 12, 2007 6:28 pm

by Dan Gerous

I'm pretty sure those are not fairings or to disrupt air on the Meridas, they're heatsinks. If the front caliper gets hot, heat transfers to the heatsink/mount, the bigger the heatsink and the more surface area it has, the more it can help release the heat, and having air flow on and through it helps this, how much though, no idea...

TobinHatesYou
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Joined: Mon Jul 24, 2017 12:02 pm

by TobinHatesYou

Also the NDS chainstay also has fins in a vertical orientation. They’re obviously heat sinks, come on.

TheRich
Posts: 613
Joined: Tue Jan 01, 2019 1:36 am

by TheRich

Looks like woo to me.

I finally broke down and went 160/160, although most of the reason is because it's a dual purpose road/gravel bike, it does make spares easier to deal with.

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