Zipp VumaChrono - DT Swiss 2010

Publié le par Adrien

Zipp VumaChrono

One year after Vumaquad's release, Zipp unveiled the VumaChrono, an aerodynamism-optimized crankset, specifically designed for time trials and triathlon.


Design :

The crankset was designed without star. It is actually a carbon plate which is integrated to the crank. The diameter of this plate is slightly narrower than the chainring so the the teeth are a few millimeters above.
The external chainring is fixed to the crank thanks to 9 screws divided all around the carbon face. The internal chainring is located very closely to this carbon face. It is although independent from it, with its own screw set, like a Stronglight X-Wing crankset. With this design, the VumaChrono can be used in a classic configuration as well as with a single chainring, depending on the need. In addition to its aero properties, its design makes a stiff component. Indeed its bolt circle diameter is much larger than a classic crankset and it also has 9 fixing bolts instead of 5.
It weights about 860 grams with ceramics bearings as standard. Its Q factor is 146 mm.

According to Zipp engineers, this revolutionary crankset would make you save 9 seconds during a 40 km event, which is the same as removing 12 spokes from the front wheel!

 

 

Concerning the compatibilities, this crankset exists in BSA and italian thread. Thus there is no BB30 expected for the moment. Zipp may be waiting for this new diameter to become the standard. This crankset will be available with cranks from from 167,5 mm to 180 mm with 3 chainring combinations : 53/39, 54/42 and 55/42.

 

 

DT Swiss 2010


We featured them in a former article, about Taïwan show, the newest DT Swiss wheels will be available in limited quantities by the end of the month. They are coming with uni-directionnal carbon fibre, DT240s hubs with special decals, and white DT Aerolite spokes and three rims depth: 32mm, 46mm, 66mm.
Each wheel will be available both for tubulars and clinchers for 2150 euros and 2480 euros, wheelbags, RWS quick releases, brake pads and special truing tool included.

Tubular Weight/set Price/set
32mm - RRC425 & RRC525 950g 2150 euros
46mm - RRC445 & RRC555 1000g 2150 euros
66mm - RRC625 & RRC725 1350g 2150 euros
Disc wheelRRC1055 1055g 1239 euros
     
Clincher    
32mm - RRC570 & RRC680 1350g 2480 euros
46mm - RRC600 & RRC700 1400g 2480 euros
66mm - RRC770 & RRC880 1650g 2480 euros
Roue lenticulaire RRC1055 1300g 1563 euros

We find the weights a little too optimistics for the two first wheels, the 32mm and the 46mm. Indeed, if we refer to their names, supposed to be giving the weights of the wheels, the 32mm deep rim would weight 220g while the real weight is 240g (tubular). The 46mm deep rim has the same issue: it actually weights 300g, while it would be weighting only 260g according to the claimed weight!
However this doesn't affect the high quality we expect from the DT Swiss wheels. The product will be officially unveiled at the Eurobike 2009, early in September.


 

Publié dans Nouveautés - News

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