 chunky & phunky
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 That gold may not be to everyones taste,bit blingtastic
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 them cranks aren't as purty as my current saints IMO!
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I think the cranks look great - so does the rear mech, but £80.....
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 gold, are they mad?! apart from that, it actually looks really rather nice
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 I like it
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 Looks like good kit, shame about the intrusive graphic on the cranks imho.
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 They certainly are 'striking'. Be interesting to see how the rather complex sounding 4 pot brakes hold up in terms of reliability, sounds like a potential minefield of problems...
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AHJ, surely it's no different from a hope m4? as that's got 2 pairs of different sized pistons?
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I was referring to how the servo wave means one set of pads hits the rotor before the other. I dunno, maybe I don't know enough of brakes to concieve a simple way of doing it...
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 Fo' shizzle ma'nizzle. Dis Shizzlemano is jus the bling da homie need on his steed. Saint, word.
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They certainly are 'striking'. Be interesting to see how the rather complex sounding 4 pot brakes hold up in terms of reliability, sounds like a potential minefield of problems...
I was referring to how the servo wave means one set of pads hits the rotor before the other. I dunno, maybe I don't know enough of brakes to concieve a simple way of doing it...
Given that Avid Codes, Hope mono 4's, Magura Gustavs and XT755's are all 4 pot brakes. There shouldn't be anything to worry about.
The pads hitting one pair before the other is because the pistons are slightly different diameters. So the pressure increases faster in one pair than the other. This was on the old XT's as well and works fine. Its also extremely simple. It has nothing to with the servo wave. Which is a sliding pivot in the lever, it doesn't really affect the caliper at all and we already know both systems work. Servo wave is all the way back from V-brakes after all. Although its interesting to see Shimano go back to a two piece caliper instead of the forged one you get in xt, xtr and the current Saint. Anyone have any ideas why?
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The pads hitting one pair before the other is because the pistons are slightly different diameters. So the pressure increases faster in one pair than the other. This was on the old XT's as well and works fine. Its also extremely simple. It has nothing to with the servo wave. Which is a sliding pivot in the lever, it doesn't really affect the caliper at all and we already know both systems work. Servo wave is all the way back from V-brakes after all.
Ah, explained.
Thank you kindly!
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might've been a bit too complicated to forge a 4pot one piece caliper?
maybe they said it for stiffness reasons (like avid)
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 The pressure is the same throughout the system. If one piston moves before the other it's because seal resistance is relatively higher on a smaller piston. The main thing is that the smaller leading piston counters the pistons/pads' tendancy to twist due to rotation of the disc which increases pressure on the leading edge of the pad. Snatch is reduced for the same reason and also because the twin piston design allows a longer pad. With a single piston the pad is offset on the piston towards the leading edge to counter piston twist and snatch.
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 I don't think that your seal resistance reason is correct John. If I remember right from Hydraulics theory back in the day, as you have the same volume of fluid entering the 2 pistons the one with the smaller surface area has to move more to maintain the same volume as the large one, and as you said the pressures will be the same in each piston.
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Rubbish. Edit: The pistons generally move together. If there is a difference the bigger piston moves first and moves further. Try it.
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| Edited: 18/04/08 20:35 |
 Recycling
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We'll be back to the more pistons = more power fallacy before long Arry. Before anyone brings it up I'll remind everyone that for a given suface area of slave pisons you get the same force on the pad however many pistons you have.
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I miss Dylan. He would have a strong opinion on a subject like this.
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