Shimano Dura-Ace 9000 Series - 11sp

Discuss light weight issues concerning road bikes & parts.
maxxevv
Posts: 1955
Joined: Wed Feb 09, 2005 4:51 am

by maxxevv

Now to prove my point that it can be done.

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NO BIG DEAL ... :waving:

Oh ya... this is how comparatively a Avid BB7 Road compares with a 160mm disc. Notice the amount of unused space ??

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Last edited by maxxevv on Sat Dec 03, 2011 8:16 am, edited 1 time in total.

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slyboots
Posts: 445
Joined: Sun May 10, 2009 3:31 pm
Location: Russia, Moscow

by slyboots

Nice job, maxxevv! :thumbup:

thisisatest
Shop Owner
Posts: 1980
Joined: Sat Jun 13, 2009 4:02 am
Location: NoVA/DC

by thisisatest

i kind of like the over/under thing going on.
personally, i'd just use Hayes' (very) old 22mm mounting pattern. it was robust, compact, and chainstay mounted.

Image

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euan
Posts: 1494
Joined: Sat Sep 05, 2009 11:20 am

by euan

Again people are forgetting about Canyon's Project 6.8

Twin 120mm upfront and a 120mm rear

http://www.canyon.com/_en/technology/project68.html
"Step forward the climber and all those who worship at the altar of lightness" - R. Millar

jimboweenie
Posts: 9
Joined: Sat Dec 03, 2011 1:24 pm
Location: North London

by jimboweenie

Regarding disc brakes on road bikes, I've been commuting on a disc brake front (BB7, 180mm rotor), rim brake rear in all weathers for about two years now. On my racing/training/go-fast bikes I have Record and Dura Ace brakes, plus lots of Veloce and Tectro dual pivots and some CNC machined oddities from Planet X.

In good conditions I agree the advantage of discs is small (it is nice to have but not essential and probably not worth the weight penalty) but in heavy rain the difference is massive. With rim brakes and wet rims it always takes a couple of revolutions of the wheel before braking really kicks in but with discs it is instant.

Now, is this worth the fuss on a racing bike, rather than a city commuter? I'm not so sure. In a pack do you really want the guy in front of you to be able to stop instantly?

But on your own, in a city, with crazy road users, in the rain? For those conditions I'd take discs anyday for the front brake. The rear locks up so easily in the rain under heavy braking anyway that I don't think it offers any advantage.

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yourdaguy
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by yourdaguy

Maxxevv you just proved my point. You can't do it without hanging the bracket off behind the axle. I think if you manufactured this it would not prove very reliable because the offset of the caliper and the stresses would eventually cause the bottom of the bracket to crack at the welds. However, whoever built the bike in the picture actually solved the problem we both failed to visualize.
For certain parts stiffer is more important than lighter.

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horse
Posts: 148
Joined: Sun Oct 09, 2011 1:09 pm

by horse

Rim caliper brake will stay in the peloton.

Could see it in the lower echelons gruppes though as it mitigates the wear on the rim. You should want to avoid drastic stops all of a sudden in any situation. MTB trails have better use due to drastic accelerations compensated with drastic decelerations from the hydraulic brake. Different situation in the road.

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CBJ
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Location: Brooklyn

by CBJ

horse wrote:Rim caliper brake will stay in the peloton.

Could see it in the lower echelons gruppes though as it mitigates the wear on the rim. You should want to avoid drastic stops all of a sudden in any situation. MTB trails have better use due to drastic accelerations compensated with drastic decelerations from the hydraulic brake. Different situation in the road.


With all the crashing going on it seems like the ability to stop quickly can be nice. However isn't the tires the real limitation. I have had several close encounters breaking full speed and it always seems like its the tire that is the problem?

Epic-o
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Joined: Tue Nov 20, 2007 7:18 pm

by Epic-o

euan wrote:Again people are forgetting about Canyon's Project 6.8

Twin 120mm upfront and a 120mm rear

http://www.canyon.com/_en/technology/project68.html" onclick="window.open(this.href);return false;


A better pic

Image

terminus
Posts: 113
Joined: Fri Oct 09, 2009 11:45 am

by terminus

any info on the PD-9000SL? really fast for Shimano to update the pedal since the PD-7900 just came out.

kevinkalis
Posts: 597
Joined: Tue Aug 03, 2010 6:29 pm

by kevinkalis

I, for one, would be happy to see hydraulic discs on road bikes. We're talking about evolution here.

Discs on the road are about as advantageous as electronic shifting.....
K2

Do you suffer more when you train, or cannot train?

Ozrider
Posts: 1021
Joined: Sat Nov 20, 2010 6:06 am
Location: Perth, Western Australia

by Ozrider

Hope they do BB30 crank which is a lot lighter,and hopefully accepts aftermarket chainrings
Also hope group set weight drops tp match new SRAM Red which is rumored to be 250g lighter than current Red
Also a return to the butter smooth shifting of DA 7800
Ozrider - Western Australia
Parlee Z5 XL (6055g/13.32lbs) Trek Madone 5.9 (7052-7500g)Jonesman Columbus Spirit (8680g)
Chase your dreams - it's only impossible until it's done

JensW
Posts: 763
Joined: Mon Jan 24, 2005 9:41 pm
Location: Uppsala, Sweden

by JensW

Ozrider wrote:Hope they do BB30 crank which is a lot lighter,and hopefully accepts aftermarket chainrings
Also hope group set weight drops tp match new SRAM Red which is rumored to be 250g lighter than current Red
Also a return to the butter smooth shifting of DA 7800



the problem is, if they try to match the new red weight (just a rumor weight ), they have to take away like 500g from 7900, that isn´t so easy to do.

boots2000
Posts: 1428
Joined: Mon Oct 15, 2007 9:28 pm

by boots2000

I have done a lot of climbing and descending rides in the rain.
It seems to me that the main limiter in the rain is traction more so than braking power?

airwise
Posts: 1049
Joined: Tue Jul 27, 2010 8:31 pm

by airwise

Don't think Shimano will worry about Red's alleged weight. Durability is an important quality for the Japanese. As for those still questioning discs, any chance of looking up the word "modulation" in Websters or the Oxford English?

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