Wilier Cento1 SR Disc Hydro 6.84kg / 15.08lbs
Moderators: MrCurrieinahurry, maxim809, Moderator Team
The braking improvement with the center lines is worth the weight savings. I have a bin full of lightweight rotors that I removed in favor of center lines on both of my Sram disc bikes.
"Any intelligent fool can make things bigger, more complex, and more violent. It takes a touch of genius -- and a lot of courage -- to move in the opposite direction."
Visit starbike.com Online Retailer for HighEnd cycling components
Great Prices ✓ Broad Selection ✓ Worldwide Delivery ✓
www.starbike.com
@743power, I've heard the centerlines brake well (and quietly) and that's definitely a strong point in their favor. But the Formulas I have on right now aren't typical "lightweight" rotors... they are a top-end product from a top-end brake manufacturer... not like a crazily machined out KCNC razor or an Ashima.
In terms of aerodynamics, maybe it's trivially small, but the Formula does have a thick star-shaped spider that is spinning and exposed to the air
In terms of aerodynamics, maybe it's trivially small, but the Formula does have a thick star-shaped spider that is spinning and exposed to the air
Looking at the data November Rails post (http://www.novemberbicycles.com/blog/20 ... 0k-tt.html), using data from the velonews comparison between disc and non-disc bikes...
I'd guess that the only difference you'd see between the two rotors would only be realized at a 0 deg yaw angle. I would guess at any other angle, the rotating rotor's should be quite similar. So at 0 deg the difference over between the disc and non-disc is 3W @ 30 mph. How much of that can be attributed to the rotor is hard to say, but given that you're talking about the spider which isn't the leading edge, and assuming rotor thicknesses are the same, the differences should be even smaller. But I'm no aerodynamicist
I'd guess that the only difference you'd see between the two rotors would only be realized at a 0 deg yaw angle. I would guess at any other angle, the rotating rotor's should be quite similar. So at 0 deg the difference over between the disc and non-disc is 3W @ 30 mph. How much of that can be attributed to the rotor is hard to say, but given that you're talking about the spider which isn't the leading edge, and assuming rotor thicknesses are the same, the differences should be even smaller. But I'm no aerodynamicist
Interesting. 3W isn't much but I was thinking that in the comparison between disc and non, the disc probably gains an advantage by eliminating the rim caliper, and then loses those gains and a bit more by adding the rotor (and caliper though that is partly shielded by the fork). So I was reasoning that the rotor could be adding more than just the overall wattage difference, and the variation between the two rotors could then be more significant. Total hand waving of course. The leading edge of both rotors is essentially identical, but that second surface of the formula ones is much wider (5mm? vs 1.8mm of brake track). Probably overthinking things.
Sent from my iPhone using Tapatalk
Sent from my iPhone using Tapatalk
-
- Posts: 108
- Joined: Sun Aug 05, 2012 7:50 am
Specialized said 8 secs in their comparison test over 40 km
-
- Posts: 988
- Joined: Thu Jan 22, 2015 6:58 pm
- Location: Northamptonshire UK
By far the best looking disc brake equipped bike I have seen!! I'm really liking your component choices too
I hadn't noticed that! Not 10cm away on the outside it says "Integrated drop out" (spelled correctly). I got the frame from a reputable dealer - CompetitiveCyclist - so I'm not worried about it being a knock-off. Any other Cento1 SR owners with the misspelling on theirs?
Hopefully the Italians payed more attention to the construction than they did to the spelling!
Hopefully the Italians payed more attention to the construction than they did to the spelling!
Looks like this bike on twohubs.blogspot.com has the same issue:
-
- Posts: 560
- Joined: Fri Mar 27, 2009 6:58 pm
- Location: Wet coast, Canada
Super build. I've yet to see a disc road build that really made me take notice, but you sir have succeeded in that!
dwaharvey wrote:I hadn't noticed that! Not 10cm away on the outside it says "Integrated drop out" (spelled correctly). I got the frame from a reputable dealer - CompetitiveCyclist - so I'm not worried about it being a knock-off. Any other Cento1 SR owners with the misspelling on theirs?
Hopefully the Italians payed more attention to the construction than they did to the spelling!
The paint on my Zero7 is a bit crooked for the extended tail of the red logo on the top tube. This isn't my frame but it shows the bit I mean...
https://lh6.googleusercontent.com/-pnjx ... cle-05.jpg
Got out for my first proper ride on the bike today. I have to say it's really good. Stiff but smooth, stable handling... everything I hoped for. The big tires are really confidence inspiring when cornering on top of all the sand we have on the roads right now. The brakes might well be worth the weight penalty - not so much that they have more power than a good rim brake, but the modulation and smoothness is really at another level. The frame was really solid under braking also, no detectable steer induced by distortion of the fork. On hard out of the saddle efforts I did get occasional pinging from the front rotor. I guess that's not too surprising with a 45g QR setup. So far I don't think it's bad enough to warrant a change, but an obvious solution would be to switch to DT thru bolt (9mm front) though that'll add another 40g or so, and Tune doesn't make compatible endcaps... so I'd have to have someone drill out a set of QR caps.
Aside from the "integated" seatstays, the only thing I wish were different with the frame is the cable routing for the front brake. It'd be so much cleaner if they routed it internally in the fork. Oh well.
Aside from the "integated" seatstays, the only thing I wish were different with the frame is the cable routing for the front brake. It'd be so much cleaner if they routed it internally in the fork. Oh well.
You have knack for putting together one heck of a bike! Love it!
On the subject of rotors, have you tried Hope X2 Race? They are my go-to rotor on MTB for being light but offer better feel and don't deform as quickly as KCNC/ Ashima
On the subject of rotors, have you tried Hope X2 Race? They are my go-to rotor on MTB for being light but offer better feel and don't deform as quickly as KCNC/ Ashima
Visit starbike.com Online Retailer for HighEnd cycling components
Great Prices ✓ Broad Selection ✓ Worldwide Delivery ✓
www.starbike.com