#46
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#47
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#48
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someone on slowtwitch independently stated (with evidence, though can't seem to find it right now), that the older Trek Madone was more aero. He expressly advised that I buy a new old stock Madone rim-brake when I was contemplating buying a new bike, stating that neither the newer rim-brake nor the disc-brake matched the older rim-brake. That was why this report resonated
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#49
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#50
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Even if it was tested properly and the results were 8w I personally would prefer the disc bike. I tried the rim brakes on the Madone once and wasn't impressed. I sure as heck wouldn't want to service cable brakes on that bike either. Once installed, there's really no reason to ever go in and replace any of the disc brake system year to year.
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#51
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http://trek.scene7.com/is/content/Tr...aper_EN-GB.pdf note that the difference is well on marginal (1% faster for the older one), but this doesn't add all lend credence to the assertion that disc-brake frameset is faster |
#52
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As much as I love my rim brakes and don’t really see the point of discs on a pure road bike, I don’t think the big manufacturers will be putting much R&D into rim brake optimization. Almost all the world tour teams are on disc this season. |
#53
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Hey I'm skeptical that any of those bikes are significantly faster than my old Cervelo S2. I've got much smaller frontal surface area on this bike than the current fat tubes used. |
#54
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Wait...how are these people up in arms over disc brakes, but they are okay with direct mount brakes?
__________________
Forgive me for posting dumb stuff. Chris Little Rock, AR |
#55
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I would tend to agree with the S2 being hard to beat aero wise. I’m still using my 2008 cervelo SLC-SL and my my soloist team. They are both getting long in the tooth though.
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#56
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which is to say, we shouldn't trust the ad copy saying that disc-brake is faster
i don't know about your riding style and attributes, but i was the type to go for any little aero advantage possible back when I raced. I couldn't accumulate points from sprinting, so I had to get away solo or in a small group, and aero helps there. The S2 was ahead of its times, and i'd venture that few framesets represent a significant upgrade over yours (earlier S5 being one of those) only minor quibble is that you can save a bit more by using an aero road brake such as the Tririg Omega |
#57
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I guess that's what the bike company marketers want you to believe (and it looks like you've been drinking the Kool Aid). But when this was discussed a few weeks ago, it was found that the majority of world tour teams are not using disc brake bikes (10 out of 18). Of the other 8 teams, 4 are using a mix of rim and disc brakes, and only 4 are using disc brakes exclusively.
https://forums.thepaceline.net/showthread.php?t=233038 I suspect that it has nothing to do with extra aero drag, and the reason racers use rim brakes instead of discs is similar to why they use tubular tires instead of clinchers: By many measures clincher tires give a performance advantage over tubulars because clinchers have lower rolling resistance (and also often lower aero drag as well), BUT: The performance advantage of clinchers over tubulars is very small, and because clinchers are more prone to pinch flats and can't be ridden as fast when flat, the risk of losing a lot of time due to flat clinchers is of greater concern than gaining a little bit of time due to their lower rolling resistance. By many measures disc brakes can give better braking performance than rim brakes, by giving more consistent brake performance over a wider range of conditions. BUT: The time gained due to the braking performance of disc brakes over rim brakes is very small, and because disc wheels are slower to change and disc brake wheels have more interchangeability issues, the risk of losing a lot of time with disc brake wheels in case of flat tire or other wheel problem is of greater concern than gaining a little bit of time due to their more consistent performance. |
#58
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Come On Spring!
Coaster brakes were so rad!
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#59
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You can get very close to these car-priced bikes for a lot less. I've been thinking about a more aero front brake for a while. Sent from my SM-G950U using Tapatalk |
#60
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Ha, ha no kool aid here! I’m still happily using my 2005 and 2008 cervelos for road cycling. I could care less to be honest, but it doesn’t take a genius to see where this trend is going regardless of the actual number of teams using disc bikes right now.
I’ve seen this story play out in the bike biz with many changing standards over the years. It’s clear to me that the majority of R&D is going into disc brake bikes and not rim brake bikes regardless how anyone feels about it. |
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