We like riding different wheels here at Bike Cycling Reviews and the lighter the better, so when we got the chance of a ride on a pair of the top clincher wheels from Shimano we jumped at it. They are light, rigid, look great and the ride they give is quite spectacular. Read on to see what we have found
First you need to look at these wheels and you can see they are different, the strengthening round the spoke holes, the carbon and alloy mix of the rims, the smooth finish of the hubs and those red nipples, but lets take a close look at the technology first.
The Tech Speck
These wheels are said to be 1380 grams in weight (less Q/R), the label on the side of the rim says so, but the set we have came in at slightly less, so no complain there! The rims are made by a carbon and alloy laminating process, this keeps the weight down and maintains the braking performance without having to change brake blocks for special carbon pads as the brake surface is alloy, although these are mostly carbon rims.
The low weight is achieved with the reduced thickness of the alloy rim wall from 1.3 mm to 0.7 mm, then the carbon fiber is bonded to the alloy for the rigidity, weight saving and strength. The extra carbon reinforcing around the spoke holes strengthens the wheels so that there will be no worries about heavy riders or hard conditions.
Dura Ace F.Hub
|
The spokes are steel butted and bladed for aerodynamics, they are also straight pull so that there is no weakness at the bend of the spoke at the head as in a normal spoke. The front wheel has 16 radial laced spokes and the rear has 20, crossed twice, the spokes on the front wheel come straight out of the hub from a wide shell and the spoke heads are hidden by a cover so that the hub looks normal. The rear hub has a chunky flange system with blocks of alloy to anchor the spokes down, then for comfort the spokes are crossed two times for a little give, the flanges are set wide for more rigidity. Shimano have now fitted a cassette body that will take a 9 or 10 speed cassette.
Rear Hub
|
The hub bearings have labyrinth double contact seals that are low friction so that no water will enter the bearings and there is minimal friction. The bearings are treated with Borozon, giving a smooth finish for top bearing performance. The hub body itself is cold forged and machined aluminum hub shell with a 7075 oversized alloy axle.
The nicest touch and a criticism are the red nipples, they look very nice, but if you look at many wheels they have internal nipples, the spoke disappears in to the rim. These wheels have the old fashioned visible nipples; this could be for strength although the internal nipples look neater. Another nice but pointless touch is the etched Dura Ace on one side of the inside of the hub which no one will see, except when stationary.
Red Nipple
|
What Do They Feel Like to Ride?
Well, they ride very well, we tested them fitted with Continental Grand Prix 4000s tires and we used them on a carbon Time bike and a Carbon Scott Addict on the same course that we tested other wheels which has a hard climb with steep sections, a fast descent and some fast flat roads and some bad surfaces, basically it has it all.
They feel fast and light and when hitting the climb there was no feeling of drag, they performed like a carbon wheel, not an alloy/carbon mix. On the descent the wheels go where you want them too, no fighting the steering, swooping through the bends they felt very lively.
Dura Ace Rim
|
The place they felt the best was on the rough roads, they seemed to take all the little bumps and uncomfortable vibrations from the ride, comfortable and positive. When sprinting with some wheels you can feel the rear wheel flex from side to side as you put the pressure on and when climbing out of the saddle and putting your weight on the front wheel you can feel some lateral give, but with the Shimano Dura Ace 7850's there is no movement, but the wheels still have that built in comfort. The wheels felt the same in both bikes, so there were no complaints.
Front Hub
|
Other Dura Ace Wheels
Shimano also manufacture a 50 mm deep section carbon rimed Dura Ace wheelset for tubular tires and also a Dura Ace Scandium road wheelset for tubeless clincher tires. So there are a few different Shimano Dura Ace wheelsets to choose from.
Our Overall View
The Dura Ace wheels are very good and not too expensive, they look the part as the red nipples tie in with the red decals on the rim, the hubs are silver and that goes nicely with the silver brake surface and the very functional quick releases, so they are stylish, perform well, are light and not too expensive.
Our Vote: 9 out of 10, those nipples lose a point.
How to submit your Cycling Question?
Proven training methods, research, data, and analysis of the
The second myth--and this one ties in with the first--is that riders can reliably determine, from the saddle, a value for wheel stiffness. Mavic ran their own studies and found that riders could NOT reliably determine, while riding, the quality of wheel stiffness. I think it's reasonable to assume that Mavic had access, in its tests, to some very experienced cyclists.
I'm not sure what, exactly a carbon wheel is supposed to feel like when climbing. I've climbed with 800g wheelsets and 1100g wheelsets. My current wheelset weighs in at 1380g. There is no difference in how any of them climbed, and this observation is backed up by science. Differences in the moment of inertia for any bicycle wheels are pretty small, and what differences there make very little difference in how a bike accelerates. At the Weight Weenies forum, Mark McM demonstrated this idea with his model of a bike/rider system. His model, as well as every other credible model, shows that the acceleration difference between a wheel with a low moment of inertia and one with a high moment of inertia is very, very small.
As for the spoke nipples, any differences in drag between internal and external nipples is very small. External nipples are located in an area where air flow is already turbulent from the spokes as a result of wheel rotation and detachment of boundary layer flow from the rim wall. There's no real consensus on whether spoke nipples should internal or external for best airflow management. There is, however, a clear consensus that it's easier to true a wheel when you don't have to remove the tire.