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  1. #1
    bee
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    Disc Brakes are coming to road bikes too - Colnago style

    Here it comes! The UCI is going to approve disc brakes for road competition. It's just a matter of time. The only question is if the industry (road, that is) will eventually settle on smaller 140mm discs, or 160mm discs.

    This is Colnago's entry into the road bikes w/ disc brakes, on display at this years Taipei Bike Show. It great that Colnago decided to do an actual road fork w disc tabs, and not a supertall cyclocross fork w/ disc tabs, thus keeping the frame a true road geometry, and not some quasi cyclocross-hybrid. Behold!

    More pics here:
    Tapei show: Colnago launch C59 Disc road bike | road.cc | Road cycling news, Bike reviews, Commuting, Leisure riding, Sportives and more


  2. #2
    pvd
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    Any disc bike without active front suspension is pretty much garbage. It's cool right now to do it, but it's a pretty lousy bike.

    They key here is ACTIVE FRONT SUSPENSION. Passive suspension is definately not adequate to handle the job of supporting the brake load AND provide for a comfortable ride.

  3. #3
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    The big deal to me is that Formula have either made their own di2 innards for the levers or are using Shimano guts inside their levers. I'm not sure Shimano will allow Formula to sell either option.
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  4. #4
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    Saw this on Cyclingnews this morning
    Although i would love disk brakes on my road bike i foresee the following problems:

    1. Weight: with super light components the disk brake system would have to be ultra light, which is possible, but currently non existent. Probably requireing small diameter Ti rotors, compact caliper.

    2. Integration into sifter/brake lever: Probably a easy switch over with mechanical disk brakes, but for hydraulic the reservoir would have to be integrated into the brake lever/shifter mechanism by one of the "big 3" Sram Shimano or Campy

    3. Front end braking: With a super light weight fork, the forces generated at the caliper could cause some bad things through the bike. Racing rodies see some high speeds, and rapid deceleration. The longer moment arm to caliper location only makes the stresses seen at the steertube higher. Plus what PVD already mentioned.

    4. Heat: with a lightweight small rotor, on a bike that is consistently decelerating on a very long downhill the heat buildup will be quite large, causing a lot of fade, or "boiling" of the hydraulic line. Catch 22 of a larger rotor disapating heat better, but adding weight, which is a no no with performance road machines.

    The pros would be no more sketchy cork pads on all carbon rims, better breaking modulation, and non of that awful squealing noise when breaking under hard turning (man it scares the crap out of me every time)

  5. #5
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    I'm excited to see it. It's about time we get rid of half the cables on road bikes too. Seeing that Formula is involved is just icing on the cake.

    Now if these guys would start doing hydraulic shifting instead of electronic, we'd be set. Still, the Colnago is cabless and I don't care what the other ramifications are, that's awesome to me. I'm still sort of surprised that the MTB wasn't the first cabless GA release--actually, I suppose the SS is.

    The sooner the rim brake is completely obsolete, the better for us all. I don't care if there is a weight penalty either--folks are too crazy about weight at the expense of function.

  6. #6
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    Quote Originally Posted by pvd View Post
    Any disc bike without active front suspension is pretty much garbage. It's cool right now to do it, but it's a pretty lousy bike.

    They key here is ACTIVE FRONT SUSPENSION. Passive suspension is definately not adequate to handle the job of supporting the brake load AND provide for a comfortable ride.
    Am I missing something here? I have both a Salsa La Cruz and a Surly Troll with disc brakes and no front suspension. I have also ridden my Niner SIR9 with a rigid fork. In all three cases, the disc brakes work great. The Salsa is especially nice for bombing San Francisco hills - it takes a lot less lever pressure to slow it down than any rim brake bike I have ridden.

  7. #7
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    Quote Originally Posted by Guerdonian View Post
    3. Front end braking: ... The longer moment arm to caliper location only makes the stresses seen at the steertube higher.
    I dont think so. The stresses within the fork legs are quite different but the stress at the steer/headtube should be the same. Draw a FBD. A disc simple relocates (and changes magnitude) one of the vectors. They still have to sum to a zero moment. Modern deep 'aero' fork blades like those pictures should be more than enough to cope w/ the different forces.

  8. #8
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    Quote Originally Posted by Guerdonian View Post
    Saw this on Cyclingnews this morning
    Although i would love disk brakes on my road bike i foresee the following problems:

    1. Weight: with super light components the disk brake system would have to be ultra light, which is possible, but currently non existent. Probably requireing small diameter Ti rotors, compact caliper.

    2. Integration into sifter/brake lever: Probably a easy switch over with mechanical disk brakes, but for hydraulic the reservoir would have to be integrated into the brake lever/shifter mechanism by one of the "big 3" Sram Shimano or Campy

    3. Front end braking: With a super light weight fork, the forces generated at the caliper could cause some bad things through the bike. Racing rodies see some high speeds, and rapid deceleration. The longer moment arm to caliper location only makes the stresses seen at the steertube higher. Plus what PVD already mentioned.

    4. Heat: with a lightweight small rotor, on a bike that is consistently decelerating on a very long downhill the heat buildup will be quite large, causing a lot of fade, or "boiling" of the hydraulic line. Catch 22 of a larger rotor disapating heat better, but adding weight, which is a no no with performance road machines.

    The pros would be no more sketchy cork pads on all carbon rims, better breaking modulation, and non of that awful squealing noise when breaking under hard turning (man it scares the crap out of me every time)
    I think in this day and age of min UCI weight limits and bikes regularly shattering that and having to add weight back to the frame with powermeters, weights on the frame etc, it seems that weight is less of concern on discs on road bikes.

    I agree that to get the discs accepted by the masses there needs to be a hydraulic integrated lever but this will be coming because CX is usually a mess, mud, snow and water and even the best cable system can be stymied by getting that goop in the caliper arm. Hydraulics won't have that problem so they will deliver them to the pros.

    I think with a lot of the asymmetric layup we have been seeing with carbon accounting for the braking forces without messing with the ride of a fork shouldn't be a problem. If they an account for the asymmetry of the drive train they can get disc brakes.

    Shedding the heat shouldn't be that big of a problem, shimano has cooled pads now and a carbon material rotors would make a lot of sense on a road bike. Not carbon fiber but carbon ceramic coatings like in the automotive high end.

    Just my thoughts on the topic. I give discs on a road bike a thumbs up if only for not having to mess with the brake to swap in a tire and for being able to ride with a slightly tweaked wheel (provided it will bypass the frame).
    Try this: HTFU

  9. #9
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    Quote Originally Posted by smdubovsky View Post
    I dont think so. The stresses within the fork legs are quite different but the stress at the steer/headtube should be the same. Draw a FBD. A disc simple relocates (and changes magnitude) one of the vectors. They still have to sum to a zero moment. Modern deep 'aero' fork blades like those pictures should be more than enough to cope w/ the different forces.
    Yep, didn't think it through about the wheel torque to disc torque magnitude change, was simply thinking Force moved down on fork = larger moment. Hehe, my college engineering courses are getting rusty.

    Quote Originally Posted by rockcrusher View Post
    I think in this day and age of min UCI weight limits and bikes regularly shattering that and having to add weight back to the frame with powermeters, weights on the frame etc, it seems that weight is less of concern on discs on road bikes.

    I agree that to get the discs accepted by the masses there needs to be a hydraulic integrated lever but this will be coming because CX is usually a mess, mud, snow and water and even the best cable system can be stymied by getting that goop in the caliper arm. Hydraulics won't have that problem so they will deliver them to the pros.

    I think with a lot of the asymmetric layup we have been seeing with carbon accounting for the braking forces without messing with the ride of a fork shouldn't be a problem. If they an account for the asymmetry of the drive train they can get disc brakes.

    Shedding the heat shouldn't be that big of a problem, shimano has cooled pads now and a carbon material rotors would make a lot of sense on a road bike. Not carbon fiber but carbon ceramic coatings like in the automotive high end.

    Just my thoughts on the topic. I give discs on a road bike a thumbs up if only for not having to mess with the brake to swap in a tire and for being able to ride with a slightly tweaked wheel (provided it will bypass the frame).
    Touche, solid on all points! I changed my mind, they are a good idea, which makes me want them even more. Sounds like a few years from now the switch will happen. As you hinted i think it will be cyclocross driven, and then a jump over into road.

  10. #10
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    I wonder where disc size will settle out. I really like my 140s, even on a mtb, but I ride in ND/MN. I made a front post mount for a 140 and still had good modulation, could still lock the front with one finger through a BB7. And that's great for short hard applications like ND "MTB" or cyclocross. You are putting the hurt on the pads and disc for sure, but not really putting much heat into the system.

    Now if I visit the homestead in CO, and find myself chickening out on a looong unfamiliar road descent I can see needing the mass of a bigger rotor for heat dissipation alone. *EDIT* Oh and 135mm rear spacing? Are the weight weenies going to really have low spoke counts on narrow hubs?
    Last edited by G-reg; 03-07-2012 at 06:56 PM.
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  11. #11
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    If you build a fork stronger on one side, it's also going to flex less. So you either overbuild both sides or you have a fork with one more flexible side and one less.

    This seems like a loss for road bike feel, as well as for simplicity.

  12. #12
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    I also run rigid forks on my 29 er and feel the brakes are great,
    If PVD could explain his comments I would be very interested as far as the tyre is concerned disc brakes are the same as a calliper brake , or haveci missed the point, it wouldn't be the first time

    The other part of the braking is that I don't think youvwould be able to run lightweight radial spoked front wheels it will have to transmit the braking torque through the spokes to the rim tyre

    But I am tempted I have seen a few heat affected carbon rims ,

  13. #13
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    Quote Originally Posted by ade ward View Post
    But I am tempted I have seen a few heat affected carbon rims ,
    Wha? Carbon is extremely heat resistant. It's the stuff left over when you burn some wood.It gets used it in F1 cars and jets and whatnot.
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    Quote Originally Posted by Drew Diller View Post
    Wha? Carbon is extremely heat resistant. It's the stuff left over when you burn some wood.It gets used it in F1 cars and jets and whatnot.
    The carbon is, but the resins are not. Special (ie. more expensive) temp resistant resins need to be used in carbon rims with a braking track.

  15. #15
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    SRAM already announced a hydro road disc brake option and hydro calipers for road bikes.
    SRAM Red Hydraulic Brakes | The Daily Grind Cycling Journal

    Tim

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    My personal bike has disc's, I use it with both 26"x 2.1 and 700C x 23 wheels (as the outer diameters are almost the same) on a rigid steel fork, 160mm disc; post mounted. I too do not understand PVD's view as it does not match my experience in the riding of my bike. I consider this the premium way to go, nothing better out there.

  17. #17
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    Quote Originally Posted by Drew Diller View Post
    Wha? Carbon is extremely heat resistant. It's the stuff left over when you burn some wood.It gets used it in F1 cars and jets and whatnot.
    TIG world already answered this. Just wanted to add. In fact, most carbon is burnt Rayon fiber so when some of the old timers call it "carpet fiber" that is not too far from the truth.

    Carbon or graphite has one of the highest melting temps of all known elements but to use it in brakes and such they use a form called RCC or reinforced carbon in a carbon matrix. No epoxy. Downsides is that it is really expensive and brittle as was demonstrated when the RCC leading edge of the shuttle orbiter failed. So, its not for everything and because of its cost can only be used for Formula Un....

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  18. #18
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    GTK, thank you.
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  19. #19
    DWF
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    Discs on road bikes is so frikken' sexy! Come on hydro brifters!!!
    A man must have enemies and places he is not welcome. In the end we are not only defined by our friends but those against us.

  20. #20
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    I was riding my Salsa Fargoish/monster cross bike last night and I realized something. No matter how well set up a cable disc is, if it's at the end of 6ft if housing with the bends under bar tape, it's going to feel squishy. I like bb7's, but a hydro line would feel great on that long run.
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  21. #21
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    The race mechanic in me is dreading disc brake approval by the UCI. Discs certainly have their applications to fill in 'road' riding. But I don't think they are destine for the TDF. Wheel changes are going to triple in time and the slight variations in rotor alignment is going to cause problems as well. Not to mention keeping the rotors straight in the back of a car following a race.

  22. #22
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    Quote Originally Posted by pvd View Post
    Any disc bike without active front suspension is pretty much garbage. It's cool right now to do it, but it's a pretty lousy bike.

    They key here is ACTIVE FRONT SUSPENSION. Passive suspension is definately not adequate to handle the job of supporting the brake load AND provide for a comfortable ride.
    PVD, are you talking about needing/preferring anti-dive links in the fork to avoid brake dive when you talk about supporting the brake load?
    If so I'd agree, but I think it's overkill on a road bike hence some suprised reactions to anyone suggesting a disc+rigid bike is garbage. We're used to thinking of 'active suspension' in terms of rear suspension from so many years of FS bikes marketing .

    However since spending a couple of years on a rigid MTB, then on a really comfy, well-balanced 29er with big tyres (ie where I don't miss the sus forks at all) I've remembered how sus forks lose control under braking as much as gain it over bumps.

    Not wanting to hijack a road bike disc thread, just interested in your comment.

  23. #23
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    I think what PVD is getting at is that it is impossible (or perhaps extremely difficult) to build a rigid fork that gives a comfortable, compliant, vibration absorbing road ride (like you get with a quality carbon fork), and then have that fork also stiff enough to handle the single sided torsional forces from a brake caliper attached at the hub end of the structure.

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    If so, it's odd to suggest that any disc-braked bike without springs is garbage.

    If passive suspension refers here to fork flex, yeah it's harder to balance the comfort and the stiffness needed for the brake but it's not impossible, people seem to manage more complex stuff with carbon. Or at least claim to.

  25. #25
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    During my monthly browsing of B.R.A.I.N. I came across this:
    Bicycle Retailer and Industry News

    "Hydraulic rim brakes for the road are not new; Magura’s HS77 and Mathauser hydraulic rim brakes were on the market about 20 years ago. But Magura’s release of a new line of hydraulic rim brakes and SRAM’s announcement that its hydraulic road brakes will arrive by fall signal a big change.

    Shimano’s 16 patents and patent applications in the area of road hydraulics—brakes, levers and hydraulic plumbing hardware—were published in 2011 (covered in this month’s Tech Briefs column, page 24). Given this activity, it’s probably safe to say it will join Magura and SRAM in offering roadies hydraulic options.

    While hydraulic rim brakes do nothing to mitigate braking issues with carbon rims, their power and modulation will be welcomed by many. Plus, their obvious technological benefits make hydraulic brakes an easy showroom sell, depending on pricing."

    No mention of disk, but hydraulic integration to the road world is well on the way already....

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