hmm .. 1 reason why cantilever+v-brakes are better than disc
- Thread starter 02gf74
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Lets use facts!
XTR Vs:
Arms 200g a pair
http://www.merlincycles.co.uk/Bike+Shop ... es_453.htm
Lever 166g
http://www.dotbike.com/p/8602?utm_sourc ... mpaign=FGL
XTR Disks:
Caliper 108g
Lever 194g
Disk weight not specified(!)
http://www.merlincycles.co.uk/Bike+Shop ... KE-SET.htm
But after much digging
Disk @ 160mm 126g
http://www.leisurelakesbikes.com/produc ... ?&id=16861
So yeah...
Even without accounting for fluids, hoses and unions compared to cables the Vs win the weight arguement. And this is XTR vs XTR
XTR Vs:
Arms 200g a pair
http://www.merlincycles.co.uk/Bike+Shop ... es_453.htm
Lever 166g
http://www.dotbike.com/p/8602?utm_sourc ... mpaign=FGL
XTR Disks:
Caliper 108g
Lever 194g
Disk weight not specified(!)
http://www.merlincycles.co.uk/Bike+Shop ... KE-SET.htm
But after much digging
Disk @ 160mm 126g
http://www.leisurelakesbikes.com/produc ... ?&id=16861
So yeah...
Even without accounting for fluids, hoses and unions compared to cables the Vs win the weight arguement. And this is XTR vs XTR
mechagouki
Senior Retro Guru
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And you can treble the weight of the rotor whilst the bike is in motion. Basic physics.
Of course disc-specific rims can be machined in ways rim-brake rims cannot to reduce rotational weight.
And discs save a riders energy by stopping faster with less lever effort, more modulation and less inclination to wheel lock and skidding.
Of course disc-specific rims can be machined in ways rim-brake rims cannot to reduce rotational weight.
And discs save a riders energy by stopping faster with less lever effort, more modulation and less inclination to wheel lock and skidding.
Cool... I would also mention hubs, as there seems to be a good bit of material neeed to provide a good mounting surface for a rotor
Although non disk hubs my not have benefitted from the same development effort that disk ones haves...
This is interesting stuff and using verifiable sources we'll come up with actual answers
Of course there's always these:
http://www.readytoridecycles.co.uk/kcnc ... -196-p.asp
A WHOLE BIKE full is is 248g
Although non disk hubs my not have benefitted from the same development effort that disk ones haves...
This is interesting stuff and using verifiable sources we'll come up with actual answers
Of course there's always these:
http://www.readytoridecycles.co.uk/kcnc ... -196-p.asp
A WHOLE BIKE full is is 248g
The number are true regarding the KCNC stuff, a few guys on here have bought them...
http://dirt-boy.blogspot.com/2007/05/kc ... pdate.html
But it'll be cool to see you get your numbers together
http://dirt-boy.blogspot.com/2007/05/kc ... pdate.html
But it'll be cool to see you get your numbers together
one-eyed_jim
Old School Grand Master
I'd love to see a derivation of that. Are you talking about relativistic effects?mechagouki":1bngn00c said:
gm1230126":nq3l84py said:The Ken":nq3l84py said:I've recently switched to lightweight rotors should I be worried?
From this...
to this...
Yes you should be worried. You've got a clamp on a cast magnesium fork leg that wasn't engineered to have one on it. This and just welding disc tabs to any old seat stays that don;t have the engineered thickness to handle it are two reasons that failure will happen. Have seen it posted more than once. I think this is one of the biggest dangers in retroland....personal engineering of newer parts onto older frames and forks that weren't designed to have it in the first place.
Don't worry GM, I've been using that front disk for almost 18 years now with no ill effects on both those Mag 21s and the original rigids. The hub uses a 9mm through axle which I think helps. And the discs I use are older than my frame and forks.
mechagouki
Senior Retro Guru
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one-eyed_jim":3i92dfnu said:I'd love to see a derivation of that. Are you talking about relativistic effects?mechagouki":3i92dfnu said:
http://easycalculation.com/physics/classical-physics/moment-of-inertia.php
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