|   Shimano twin sided disks for XTR 05? | boxxer
Nov 18, 2002 6:30 PM | | Rumour
Shimano are looking at twin water cooled disks in XTR for 04 / 05, the disks will run on a standard 6 bolt hub, use the IS disk mounts and should have a config as below
(C=caliper D=Disk P=Pad(imagine looking down on caliper))
CPDPCPDDPC ....so basically there are the two disk rotors
CPDCCPDDPC ....a gap for the middle of the caliper
CPDCCPDDPC ....and pads on the inside/outside
If you get the simplistic diagram, the brake will be a 4 pot, 2 pistons per disk and because of the power the disk will be limited to 145mm and should be significantly lighter than the current models
Water will be sprayed in from a reservoir on the bike into the centre of the caliper and onto the disk, meaning better heat dissipation and a cool steam effect, this is monitored by an upgraded flight deck system so as the water is used as effectively as possible and only on hot disks
Lets see if they do it |
| Shimano had a twin rotor prototype XT disc... | AndyH
Nov 19, 2002 5:27 AM | | ...a few years ago. Twin rotors seperated by a few mm, three pads per caliper. I've seen photos of it and the short write-up mentioned that most downhillers found them too powerful and difficult to modulate. |
| Rim Caliper...hee...good idea, anyway.... | PsyloRaceDH
Nov 19, 2002 7:02 AM | | I also saw a pic of a 3 pad, 2 disc setup, which too much power.
But water cooled disc? I can only dread the amount of weight that would cause, along with complitatedness, AND price. I don't think water sprayed on a hot rotor is a good idea anyways.
I always wondered about 1 disc per side of the wheel, like SportBikes....why not try that?
Didn't someone have a custom fork once and do that?
In all reality...I lock up my wheels all the time when racing, I don't need any more power! It is the tires that really stop you. Thank God for stickies!!! |
| Formula used to offer a two-rotor setup which is why Marzocchi.. | DeeEight
Nov 21, 2002 12:30 AM | | forks used to come with disc mounts on BOTH fork legs. To run the double-formula
discs in front. |
| How is this new? The Shimano DH discs were the same way... | DeeEight
Nov 21, 2002 12:28 AM | | except they didn't make it into production as they were just TOOO damned powerful. Racers would spray their rotors with WD40 or triflow
and try and minimize the power.
If you want better heat dissipation, use something better for the rotor than stainless steel with a better thermal conductivity. |
| better thermal conductivity... like what? | Dave S
Nov 21, 2002 8:21 AM | | instead of stainless... hardened steel? aluminum? Ti? |
| Aluminium, titanium, various MMCs, different types of steel.... | DeeEight
Nov 22, 2002 1:53 AM | | stainless only gets used because it doesn't rust and its cheap and easy
to machine. Aluminium and Metal Matrix Ceramics used to be more common
for discs but they were costlier materials to work with and in order
to bring disc prices down, things had to change. Now Aluminium and Titanium
rotors are seen as an aftermarket upgrade for weight weenies but they
have other benefits, and better thermal conductivity is one of them.
Aluminium's thermal conductivity for example is about 10 times that
of stainless steel and titanium is about three times that of stainless. |
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