|   6-piston brakes | Rob
Sep 22, 2001 6:24 AM | | Ok, I know I am going to start some trouble, but anyone think there could be a market for a 6-piston brake caliper?? And what about carbon brake disks??
Rob |
| There will be............... | Mike T.
Sep 22, 2001 7:32 AM | | ......a market from the "Gee I got 6 pistons.....how many YOU got? Oh only FOUR?" crowd.
CF brake discs have to run too hot to work on a mtb. On F1 cars you can see them glowing red. |
| To tell you the truth... | Robert.
Sep 22, 2001 11:13 AM | | I much rather have single piston caliper than a multi piston caliper. Simpler, probably more reliable, easy to maintain and cheaper. It works just as well with 6 times less fuss. |
| re: 6-piston brakes | Dougal
Sep 22, 2001 3:10 PM | | The only reason you'd use a six piston brake is to get more piston area without increasing the height of the braking surface on the rotor.
For mountain bikes we can just keep increasing the rotor size to gain more leverage, it's not like cars where we're limited by the inside of the wheel.
I'm wondering if Hayes will ever introduce a 4 piston mountain bike disc. It's not necessary but it would give them the same wank factor as the other 4 piston brakes.
Dougal.8m.com |
| already done | CoyoteBoy MCM756
Sep 22, 2001 5:28 PM | | Clim8 are making some, they are in the testing phase as we speak, and will be released at £99 UK soon.
And just for the record, multi pistons give better leverage and more power for size, as the single piston bunch have to go for larger pistons to get the same out - hence heavier.
Thats why some rally racing calipers are 10 pot for cars - dya really think they'd go to extra expense for no reason?
JB |
| Clim8 website??? | Rob
Sep 23, 2001 2:30 AM | | Hey JB,
Does Clim8 have a website?? Aircraft(large) brakes have 8-16 "pucks"(pistons), so the more, the better.
Rob |
| indeed they do... | CoyoteBoy MCM756
Sep 23, 2001 5:33 PM | | www.clarkscables.com
I dont know if it is featured there yet, but if you ask them about them (amartin@clarkscables.com), give me a mention will ya, Adrian knows me sorta :)
James Buckle |
| re: 6-piston brakes | Marlin
Sep 22, 2001 9:24 PM | | The only advantage that I can see with a 6 piston, assuming it was a differential design (smaller leading piston w/ the adjacent piston being larger) is that you could spread the swept area out over the disk radialy. If you maintain a swept area equal to a fewer piston design you will be able to reduce the disk's breaking surface cross section height resulting in a lighter rotor. Adding pistons will not increase leverage or "power" unless the total caliper piston area was increased or the master cylinder bore size was reduced. |
| Too much brake | Pat T.®
Sep 23, 2001 3:14 PM | | There really is no need for a 6 piston system, it would be too much brake for anything but the most extreme down hill runs. Aircraft use that many pistons so that they can run a larger pad to dissipate heat, it's not for more braking power. Too much heat and the wheels will burst into flames. Carbon rotors are usless on anything but F1 racecars, some sprint cars have tried them but they have found that the normal cast rotors work better. |
| Agreed. | Robert.
Sep 23, 2001 7:17 PM | | Multiple pistons is a marketing gimmic more than anything. It does not have any bearing on how much power a brake system produces. The leverage produced by a single huge piston is the same as 6 little pistons of the same volume. The Hayes DH and Gustav M use dual piston systems and are significantly more powerful than shimano/ grimeca 4 pistons. The added weight and complexity isnt worth it. |
| Too much brake | green machine
Sep 23, 2001 8:53 PM | | don't forget the 500cc Grand Prix race bikes! the have carbon pads and rotors also |
| re: 6-piston brakes | Jason NADS#111
Sep 24, 2001 6:58 AM | | I know more pistons = more braking surface area = more friction which will probably give more power. I'm not sure, but more pistions may also = more heat which may cause problems...probably not though. One thing I do know is more pistons = more expensive to replace which for me would keep me from even considering such a system. When it cost me about $20 for 1 pair of disc pads, I can't even imagine having to replace any more then that.
I have a Coda Expert disc on the front and an Avid Mech on the rear of my bike. Even the Coda which seems to be the worst brake out there gives me enough stopping power. The Avid Mechanical gives me more then enough stopping power. I'm speaking from a XC point of view, it is probably a different story for DH but I don't know if it would be enough to warrant a 6 piston brake caliper. Call me crazy.
As for the carbon rotors...who knows. I do know that road racers have problems with carbon wheelsets which have a carbon brakign surface. I would probably avoid carbon rotors too. |
| hmm..i think your membership needs a review... | zedro
Sep 24, 2001 9:00 AM | | surface area of a pad has no relationship with the amount of friction produced. Weird but true. The relationship would be if the larger pad dissapated heat better, but this is a different statement and mechanism. |
| sorry... | Jason NADS#111
Sep 24, 2001 9:32 AM | | Sorry about that. After thinking about it, I know you're right. More surface area does not create more friction.
Frictional Force = (coefficient of friction for material) * (force in opposite direction) |
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