Lighter disc brake adapters.

Discuss light weight issues concerning road bikes & parts.
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Ticlimax
Posts: 90
Joined: Thu Aug 04, 2016 2:44 pm

by Ticlimax

Hi,

I'm bulding up (slowly) a frame with Flat Mount disc. However, I have post mount calipers so I need adapters.
I simply bought the Shimano adapters, but was surprised by the weight (100g for both adapters + bolts).

Is there an affordable weight weenie reliable alternative to Shimano adapters?
Would flat mount brakes save me a lot of weight (probably lighter adapters)?

Flat mount brakes would look cleaner but I'm not sure if it is worth the expense.

stormur
Posts: 1182
Joined: Tue Aug 12, 2014 3:50 pm
Location: FIN

by stormur

Definitely flat mount brakes will put heat much closer to your fork and frame ;) that's biggest "benefit" of it :mrgreen:
Go to Heaven for the climate, Hell for the company.
Mark Twain


I can be wrong, and have plenty of examples for that ;)

by Weenie


Ticlimax
Posts: 90
Joined: Thu Aug 04, 2016 2:44 pm

by Ticlimax

stormur wrote:Definitely flat mount brakes will put heat much closer to your fork and frame ;) that's biggest "benefit" of it :mrgreen:



One would assume that they thought of this when designing the frame for it, no?

joejack951
Posts: 386
Joined: Fri Feb 18, 2005 6:50 pm
Location: Wilmington, DE

by joejack951

Which levers are you going to be using, mechanical or hydro? How much do your current calipers weigh? 100g for the adapters and hardware is quite a bit considering a TRP Spyre Flat Mount is 10g lighter than the post mount version.

Ticlimax
Posts: 90
Joined: Thu Aug 04, 2016 2:44 pm

by Ticlimax

I have Br-r785 calipers right now (and thus hydro levers). The reason it is so much more is because the frame is made for flat mount, I think. Br-r785 calipers and br-rs805 weigh approximately the same according to sites. But then again, measurements rarely include the adapters.

hannawald
Posts: 189
Joined: Sat Dec 17, 2016 7:28 pm

by hannawald

Try to sell current calipers and buy flat mounts, that is what I would do. May be you can find used 805.

Ticlimax
Posts: 90
Joined: Thu Aug 04, 2016 2:44 pm

by Ticlimax

I've tried. Selling post mount disc calipers isn't easy, turns out people want flat mount :). Might just install them and take the added weight for what it is.

motorapido
Posts: 263
Joined: Fri Jul 30, 2010 7:08 pm

by motorapido

These KCNC are possibly some of the lightest,

https://fairwheelbikes.com/kcnc-flat-mo ... e-adapter/

Ashima make light PM to PM adaptors and may do flat to PM as well,

or the try TRP ones,

Ticlimax
Posts: 90
Joined: Thu Aug 04, 2016 2:44 pm

by Ticlimax

motorapido wrote:These KCNC are possibly some of the lightest,

https://fairwheelbikes.com/kcnc-flat-mo ... e-adapter/

Ashima make light PM to PM adaptors and may do flat to PM as well,

or the try TRP ones,


The KCNC ones weigh 94g for the pair (possibly bolts not included). The Ashima's come in at 120g :(. Turns out adapters are just really heavy. Haven't found a weight on the TRP ones so far, but considering they look the same and are made from the same material... (Thanks for the site though, does provide clarity)

motorapido
Posts: 263
Joined: Fri Jul 30, 2010 7:08 pm

by motorapido

I'm pretty sure those weights include the bolts, (which are stainless steel ) swapping them out for Ti would give a bit of a saving.
But they are always going to be more than flat mount callipers on there own,

by Weenie


Ticlimax
Posts: 90
Joined: Thu Aug 04, 2016 2:44 pm

by Ticlimax

Turns out I don't have a choice. Tried installing as is, but the rear triangle is too small to fit the adapter.

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