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r4robert



Joined: 25 Nov 2019
Posts: 2
Location: Folkestone, Kent

PostPosted: Mon Nov 25, 2019 5:21 pm    Post subject: Finned Brake pads Reply with quote

Hi everyone, this is my first post.

I've just built an electric mtb based on a Scott Scale 720 hard-tail and a 1000w Bafang motor. I am a novice mtb rider, partly disabled after a motorbike RTA, hence the electric motor.

The bike weighs 25kg with battery and I'm 95kg, and I'm finding that stopping at the bottom of my local hill, on road, requires a lot of braking power. I'm stopping OK without any discernible fade, but I'm using 100%. Ideally I'd like to have something in reserve.

I've upgraded the rotor from 180/160 to 203/180 and put some Matrix race pads in the front. This has helped, but after reaching 45 mph downhill the other day I had a major lack of confidence.

So I've just bought some Zee 4 pots, F & R, and before I fit them I have been looking at brake pads again. Found this site, studied the pad type graph/chart and watched a great video of blind testing pad types, but I can't find a mention of finned pads.

So here's my question: Are finned pads a distraction I should ignore, or with 120Kg doing 45mph should I consider using them to reduce the risk of excessive heat getting into the brake system/fluid?

I don't plan to do stupid speeds all the time, but electric bikes often have more powerful brakes than their non-electric cousins. Besides, I've taken up mtb riding to lose weight not frighten myself!

Thanks for your advice Smile

(PS. Yes, I know 250W is the legal max for the road, but it's the only route to my local trails...).
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mikethebike



Joined: 23 Mar 2015
Posts: 195
Location: England

PostPosted: Tue Nov 26, 2019 8:00 am    Post subject: Reply with quote

Hi,
Thanks for your post. We don't have finned pads in our line-up and from our experience, they don't make a massive difference under normal riding conditions. They do help to dissipate when you are riding long descends where there is a lot of heat build-up and no opportunity for the brakes to cool down again. You are describing a situation (when you are descending at 45mph on an e-bike) which is rather extreme, and a mountain bike brake might be pushed to its limits there. Finner pads might help in that situation; we can't reliably comment on that as we don't look back at personal experience here. Larger rotors and four piot brakes should help as well as a compound which can deal with the heat build up a bit better.

We hope that helps.

DiscoBrakes Team
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r4robert



Joined: 25 Nov 2019
Posts: 2
Location: Folkestone, Kent

PostPosted: Tue Nov 26, 2019 11:58 am    Post subject: Finned pads Reply with quote

Thanks for the reply.

I've ordered a couple of sets of the Ceramic Pro pads, as looking at your pad compound graph they provide powerful stopping power.

I agree 45mph is extreme, but it's only for a minute or so, hardly the same as a sustained DH run, so heat build up in the brake system should be relatively low. I'll stick to non-finned pads from now on and think more carefully about compounds instead.

Great to have found you guys!
Cheers.
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