Italian wheel manufacturer Ursus has turned to metallurgy to combat heat related braking issues on their carbon rims.
The 2014 Ursus C25 and C50 carbon clincher wheels get a new 1mm thick copper weave in the brake track that they say drastically reduces braking temperatures. It’s bonded in during construction, so it shouldn’t wear off. That’s combined with their HTG high temp resin to dramatically reduce heat buildup. They’re saying braking temps can run as high as 300-400 degrees C, and these reduce it down to 70-100 degrees C.
Weights are 600g front /750g rear (C25) and 695g/845g (C50). Retail is $2,400 per pair. Both are 20mm wide at the outside, and they’re 25mm and 50mm deep respectively.
Closeups of the copper and the actual production finish, plus their new mountain bike wheels, below…
A close up view of the copper weave.
On production models, it won’t be quite so coppery looking. Here’s a finished wheel…
…and a close up of the production brake track.
They’ve also added mountain bikes wheels to the line. The top model is the carbon rimmed Diablo, which comes in 27.5″ and 29er. Rims are reinforced unidirectional fibers that are 25mm wide and 20mm deep. They’re built with Sapim spokes using Ursus’ SLN (Self Locking Nipple) system that places nylon bushings around the nipple to prevent binding or loosening. They come in at 615g F/783g R for the 27.5″ hoops and 650g F/825g R for 29ers.
Below that are two alloy models below it called Viper and Spark, both with anodized black aluminum rims. The Viper (above) comes in all three wheel sizes with an 18mm deep asymmetric rim, offsetting the spoke bed for more even tension. They’re built with the SLN nipple system, but use different rim widths and spokes for the larger two wheel sizes. The 26″ is a bit lower end with Sapim Force spokes and a 22mm wide rim…and it’s a bit heavier for it The 27.5″ and 29er get CX-Ray spokes and a wider 25mm rim. Weights are 730g F/855g R (26″), 650g F/818g R (27.5″) and 685g F/815g R (29er).
At the low end are the Spark, a basic alloy wheel. It also comes in all three wheel sizes, uses SLN and has a 23mm wide/18mm deep rim. Weights are 900g F/1140g R (26″), 925g F/1165g R (27.5″) and 975g F/1195g R (29er).