2009 Model No Longer Available
Shimano Dura-Ace WH-7850-C24 Carbon Wheelset - Tubular - 2009 BCS
We hope the following association doesn't ruin your appreciation for the ultralight Shimano WH-7850-C24-TU wheelset. Michael Rasmussen rode them at the 2007 Tour. We think despite his reputation, this is worthy of note. Rasmussen was an absolute, dyed-in-Lycra, worship-the-digital-gram-scale-more-than-racing itself, weight weenie. The guy raced with one water bottle cage on his bike. He used a one-piece handlebar-stem combo. He shaved his head. He even was allowed to use discontinued Vittoria CX tubulars with the 100% cotton casing. Truthfully, he preferred the older, custom wheels with the internal nipples, but he also had a set of these, as did the rest of his Rabobank team. The internal wheel nipples were given the thumbs-down by team mechanics, which is why Shimano switched to external. But neither they nor you want to rip off a tubular to true a wheel.
Teammate and possibly the wiliest sprinter of the bunch, Oscar Freire pulled these out for the hillier stages and rolling races. Even when he knew there was a likelihood of a field sprint, these were on his bike. Freire is small and explosive and these help him jump around the peloton as he looks for the right attack or the wheel to latch onto.
This is not only a climbing wheel, but a wheel than can accelerate quickly. Jumping out of corners, getting away fast, is also where this wheel excels. We think this ultralight DA Carbon Fiber Tubular wheelset is where the Shimano wheel line starts to get really interesting. Rather than use the same carbon fiber front and rear rim, they use not only different heights, 28mm in front and 24mm in back, but have a unique asymmetric, or offset, design for greater strength. This is the first time we've seen this in carbon fiber. For those who are concerned with the durability of ultra-light rims, this is one to seriously consider. The target weight is 310g for the rims. These may be flyweight, but they're strong enough for a heavy weight.
The result is a great climbing wheel with fewer spokes than we've used to seeing on wheels designed to go uphill. The fewer spokes, the less resistance to the wind, which is a benefit going down and racing along the flats. And despite the light weight, the wheels still exceed the tough, European DIN-plus standard both for strength and longevity. The latter is the result of using angular contact bearings, something Shimano adamantly believes are better than sealed cartridges.
Shimano is also staking a claim at the hub. They stick to loose angular contact bearings rather than sealed cartridges for long life and easy rolling; this is the second place where Shimano exceeded the DIN-plus standard, by an order of five. They also have designed an oversize 15mm aluminum axle for strength and stiffness at the hub. Does this matter? It can help minimize flex if the fork is one that moves around under pressure. A better line when leaning hard into a turn and less effort to keep the bike going straight when thrashing out of the saddle are nothing to sneeze at if you're the kind of rider that can flex everything or has already found some unwanted flex. Further stiffening the wheel are wide hub flanges, 59mm wide in the back. The wider flanges mean greater lateral stiffness, so less energy loss from side flex.
Note: Shimano recommends their R55C cartridge brake pads for their carbon rims. The cartridge pads fit brake shoes on the Shimano BR-7800, BR-7700, BR-6600, BR-6500, BR-5600, BR-5501, BR-5500, BR-R600, and BR-R560 brakes. This doesn't mean that SwissStop or Kool Stop carbon-specific pads don't work, just that Shimano doesn't recommend them.
The Shimano Dura Ace Carbon Tubular wheelset has 28mm deep carbon fiber front rim and a 24mm offset carbon fiber rear. The front wheel has 16 radial spokes, the rear has 20 cross-two spokes, all straight-pull. The spokes are stainless steel, ion plated, double-butted and bladed. The gauge is 14g/16.5g/14g for the front and non-drive, 14/15/14 for the drive. The spokes are attached to the rims via aluminum nipples at the rim. The nipples are anodized red. The hubs have aluminum shells and axles and run on loose-ball bearings. The quick release skewers have aluminum shafts and parts. The cassette body is titanium and is compatible with 8/9/10 speed Shimano, Shimano-compatible and SRAM cassettes. It is available in 700c only. Shimano offers a three-year warranty with Dura-Ace wheels. Front wheel weight is 530g and rear wheel weight is 727g. Weight is 1257g for the set without quick releases.
- Shimano cup- and cone-style bearings allow the owner to strip and re-grease hubs with relative ease
- Titanium freehub body is light and durable, and it provides quick engagement
- Oversized 7075 axles for exceptional stiffness and buttery-smooth operation
- 24mm rim depth prevents unexpected crosswinds from blowing you over during your next training ride
- Carbon-reinforced spoke holes allow the WH-7850s to comfortably carry heavier riders
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Since the braking surface appears to be carbon (right?), are carbon-specific brake pads recommended/supplied?
June 28, 2011
For what it's worth, I ordered these wheels and they did end up coming with Shimano carbon-specific brake pads. (Plus two wheel bags and a tiny magnet for your computer.)
And like Nate said, they are indeed full carbon. It's the clincher and tubeless versions that are carbon-wrapped aluminum.
September 21, 2011
These are full-carbon rims, so yes, carbon-specific pads are recommended. None are included, however. As is usually the case, Swiss Stop Yellows are money.
By: Nate King
September 13, 2011
May 11, 2011
I can only describe these wheels in one word - love. They're probably the only pair of wheels I'll hold onto for as long as the Shimano 10-speed freehub is relevant to cycling. Laterally stiff for crushing sprints, but not maddeningly skippy like a deep dish carbon rim in tight crit corners. I also own a pair of ultra high-end super deep (60+mm) wheels that simply gather dust on race day - I'd much rather take these out. They're stiffer (the wide hub spoke flanges aren't a gimmick), faster to spin up (the weight in these is all at the hubs), and likely more durable. I've tossed them into the ground and into potholes with nary a complaint. Hell, I ran the front wheel during a TT (Gila, specifically), and won.
Check the Roues Artisinales Great Wheel Test (http://www.rouesartisanales.com/article-15505311.html), and you'll see they're nearly on par with the likes of the Zipp 404 when it comes to aerodynamics/stiffness, yet have MUCH higher quality hubs and a lighter weight. Don't buy the super-deep hype. There are better places to improve your speed.
These wheels took me from Cat 5 to Cat 1 in the space of three months. Buy them (especially at this price) - they're nicer than every other shallow offering on the market. You will go faster.
Write your question here... What is the difference in perfromance
Write your question here...
What is the difference in perfromance between the high profile WH 7850-C50TU and narrow profile WH 7850-C24-TU and similar models
By: Joe Brenner
August 5, 2009
The C50 is going to be a good wheel for faster events where aerodynamics and Stiffness is what you are looking for. So Time Trials, Flat Road Races and Crits. The C24 is a very areo wheel but has a much lighter rolling weight. So better suited for Climbing events but will still make a great everyday wheel.
By: Chris Kelly
August 25, 2009
Roues artisanales did a comprehensive review if you have polished up your french, http://www.rouesartisanales.com.
Otherwise the general opinion was the C24 was a good lightweight climber with decent aerodynamics. I hear is had just a bit less aero advantage as the C50. Both were fairly stiff.
These wheels are marketed to two differnt segments though and the C50 is better at straightline events when the wind is lower and the C24 is considered a excellant climbing wheel. The thing is the C24 is much more aero than most climbing wheels so I guess it is a great all around set.
By: Damon Salter
August 5, 2009
- aluminum, carbon fiber
- Rim Width:
- 20.8 mm
- Rim Depth:
- 24 mm, 28 mm
- Front Spoke Count:
- Front Hub:
- Rear Spoke Count:
- Rear Hub:
- Spoke Material:
- stainless steel
- Spoke Nipple Material:
- Axle Type:
- 108 mm, 141 mm
- Brake Compatibility:
- Front Weight:
- 527 g
- Rear Weight:
- 727 g
- Complete Set Weight:
- 1254 g
- Recommended Use:
- racing, training
- Manufacturer Warranty:
- 1 year