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Old 10-27-04, 09:53 AM   #1
JohnnyTheFox
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Twin Disc Brakes

I've seen on alot of motorbikes now they have a disc and caliper on both sides of the front wheel. Obviously for more braking power, but do any DH bikes use this yet? Might be a bit too powerful...
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Old 10-27-04, 10:02 AM   #2
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i'm not sure if anyone's riding them yet, but i remember seeing pictures of a bike with dual rotors on the front at one of the bikes shows - don't remember if it was interbike or eurobike or what...

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Old 10-27-04, 02:27 PM   #3
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Originally Posted by JohnnyTheFox
I've seen on alot of motorbikes now they have a disc and caliper on both sides of the front wheel. Obviously for more braking power, but do any DH bikes use this yet? Might be a bit too powerful...
No, and I doubt they will even become very popular. A single 8" disc brake up front is more then enough braking power. Plus dual rotors and calipers ad's weight and no forks are set up for two calipers. Although they could be made, so would special hubs and it could get expensive.

I have seen some pictures too but its overkill. IMO.
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Old 10-27-04, 02:41 PM   #4
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Could you imagine how skinny the hub would need to be to fit in conventional spaced forks? It would almost have to be a package deal - Fork, hub, dual caliper sytstem.
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Old 10-27-04, 02:45 PM   #5
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Weight wouldn't allow it. They will continue with one thin rotor and just add extra pads/pistons. I couldn't imagine running a motorcycle rotor...would weigh as much as my fork.
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Old 10-27-04, 02:54 PM   #6
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What is this obsessive compulsion with stopping? The whole point of DH is to GO fast. Not to see how fast you can stop.
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Old 10-27-04, 03:01 PM   #7
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Good braking makes you faster, not slower. 6" in the front is inadequate for dh for almost any rider but the smoothest and lightest (I, personally, am neither smooth nor light) haha
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Old 10-27-04, 08:51 PM   #8
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What is this obsessive compulsion with stopping? The whole point of DH is to GO fast. Not to see how fast you can stop.
You want brakes when theres a tree infront of you and your going 25+ MPH. Either good brakes or pray you can avoid it. I think the OCD thing about brakes in DH is modulation. Oh well.
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Old 10-27-04, 09:00 PM   #9
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A few years back Shimano made a dual disc set up that had both discs on the same side ( as a proto type only) - the claiper had 3 pads - the inner, the outer and one that slipped between the two rotors. This setup was tested in a few pro races. I remeber reading that a couple pros were spaying there rotors wit oil to reduce the power. Overkill.
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Old 10-27-04, 09:07 PM   #10
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One thing about twin rotors would be that they would get rid of the twisting force disc brakes put on the fork.
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Old 10-28-04, 12:25 AM   #11
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no push bikes would use it
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Old 10-28-04, 12:46 AM   #12
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Balancing out the braking forces is definitely a good thing, but most DH forks should be sturdy enough to make the twisting very minimal. Also, such a design would allow for greater heat dissipation, meaning that you wouldn't have as many problems with fade and overheating the fluid. However, the same effect could be achieved by simply increasing the size of the rotor on a conventional system....oh wait...they've done that! Eight inch rotors (and maybe larger, as bikes get faster) give all of these benefits without the downside.
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Old 10-28-04, 04:17 AM   #13
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Isn't it ironic that you go faster with better brakes?
Also, with a setup like that, would you need splitter setup on the hose, or cable?
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Old 10-28-04, 05:07 AM   #14
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I know a guy and he's got a hub sitting at home with dual disc capabilities. Just a small problem though, no companies make forks with disc tabs on the right leg, let alone right side calipers.

AND then as Hopper said, you'd need to get some kind of split system to get the working off the one brake lever.
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Old 10-28-04, 05:35 AM   #15
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I guess for heat dissapation it would be good as for the same stopping power you would be using only half the power on each ?maybe?. One more thing to wrong tho, or many more things lol. Design for the sake of design really. Be interesting to try if you were made of money. ABS anyone?
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Old 10-28-04, 09:05 PM   #16
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Haha....ABS...I bet that would feel weird on a bike. Interesting idea though. You'd need a lot of extra hardware to make that work...including some kind of electric or vacuum source like on a car. I'm not so sure how you could make that work....
I think with a bike you'd lose a lot of control if you had ABS...for instance you couldn't drift the rear tire around switchbacks.
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