Weight penalty for Parlee z zero disc over calipers

[greentimgreen]

I've been holding off ordering a Parlee z zero to see what would come out of Eurobike. Lots of nice new kit, as expected, but the photo that stands out for me is the new z zero disc. Lots like an incredible piece of kit, but I'm primarily trying to build a light (but future proof) bike.

My question is, if my current build (nude/ waxed frame with zipp 202 clinchers - for now- , enve finishing kit and dura ace di2) is likely to weigh in at around 6.5kg, how much would the equivalent disc version weigh? 7kilos? I'd love to to know how much the eurobike version weighed.

Any thoughts would be appreciated!

[djconnel]

On the new Altum, it's

caliper version: 750 g frame + 280 g fork
disc version: 810 g frame + 330 g fork

So 110 grams frame + fork

[greentimgreen]

Thanks djconnel. Any ideas how much the discs and cables/shifters add?

[morrisond]

The Altum disc fork is 360 grams

If you want to save weight on the brakes use XTR calliper and Scappa carbon discs, that will drop about 200 grams over normal Shimano hydraulic, then build up wheels with Tune hubs and Enve M50 rims - easily less than 1,300 gram Wheelset.

[Calnago]

Carbon discs?? In an application where heat dissipation is paramount, why on earth would anyone choose carbon as a material for the disc on disc brakes? I don't get it.

[morrisond]

My mistake - Carbon/Ceramic

Just ask all the high end car makers what makes them so good.

http://www.bikerumor.com/2014/08/30/eb1 ... ke-rotors/

[greentimgreen]

Sounds like a 6.5 kg build could still be possible then, but at a cost! It does concern me how quickly disc technology will improve though, versus an equivalent ee brake build, which from the sounds of things is near perfect in its execution. Would be nice not to worry about tyres popping in next years Marmotte though! Hmm...

[Shallowhal]

My mistake - Carbon/Ceramic

Just ask all the high end car makers what makes them so good.

Carbon/ceramic brakes on cars are nothing like those. iirc, they're no better than steel discs in terms of stopping power, they're just better at higher temperatures. Are carbon/ceramic brakes early necessary on a road bike?

[morrisond]

40 Gram + Weight savings per rotor! This is Weightweenies and I would think these will work better than the SICC pure carbon rotors.

[boots2000]

All of the required disc brake gear will add about .68 kg to your bike.
So if frame fork is an extra 110 grams, expect that a disc complete bike will weigh .78-.79 kg more than a similar build with standard road brakes.

Thanks djconnel. Any ideas how much the discs and cables/shifters add?

[djconnel]

The Altum disc fork is 360 grams.

I got 330 grams from here. So at least 110 grams, then.

Also front wheel will need to be built a bit stronger, but then you can use lighter rims.