The Ultra 55T
is our aero reference.
In countless CfD lopps the aero rims have been optimzed to perfection
in accordance to the latest technological findings: Toroidal rim section analog to ZIPP's Firecrest design for a top aero performance whilst at the same time minimizing the steering influences in disturbing cross-winds
for an as neutral and good-tempered handling as possible.
The very high inherent stiffness
of the rims grants a precise steering and positive handling even with a 16/20 spoke count whilst its low weight of 1125 grams
still allow for true climbing capabilities.
Specifications - Ultra 55T
Axles: front 100mm; rear 130mm
Laminated spoke holes
|Weight (+/- 5 %)||1125 g/set|
|Rims||ax 55T, 385 g/piece|
|Rim material||Full Carbon|
|Brake type||Rim brake|
|Rim depth||55 mm|
|Rim width brake track||24.5 mm|
|Aero rim width||28 mm|
|Hubs||Extralite CyberFront SP / CyberRear SP|
|Spokes||DT Swiss Aerolite, black|
|Nipples||DT Swiss Pro Lock hidden, internal|
|Spoke tension||front: 100 kgf, rear driveside: 140 kgf|
|Spoke count (f/r)||16 / 20|
|Field of use||Road|
|Rider weight limit||100 kg|
|Scope of delivery||Carbon brake pads|
Instead of simply drilling the spoke holes of our rims, we take a different approach with our rims: Every single spoke hole is crafted by hand and reinforced with strategically placed reinforcement patches.
The advantage is obvious: Where carbon is being drilled, one inevitably also cuts through fibres. A continuous fibre flow however is essential for the material to play its advantages such as the high tensile strength, even more indispensable for nipple holes that are exposed to high spoke tensions. Specifically crafted nipple seats allow an optimal orientation of the nipples and at the same time distribute the occurring forces evenly into the rim bed.
Independent testing at an university lab has confirmed the performance of this time and labour intensive approach: The rim is capable of withstanding nipple pulling forces of over 5000 N - circa twice as much as the best competitor and more than every hub flange or spoke would be able to endure. As a result our rims do not carry any spoke tension limit!
Us ourselves we are building our wheels with up to 140 kg of a spoke tension: A guarantor for you to have long-lasting joy with your wheels. The higher the spoke tension, the lesser the opportunity for a spoke to be unloaded upon an overload of the wheels (e.g. from a compression such as an obstacle, pothole or anything alike) and the wheels to therewith come out of true. That way you are longer able to ride with your perfectly trued wheels. As an additional advantage there also is minor increase in stiffness to be recorded.
An effort that pays off!
Extralite CyberHubs SP / CeramicSpeed Ceramic-option
Our Ultra wheelset invariably rely on high performance hubs from Extralite. The Italian lightweights are some of the lightest hubs on the market. An intelligent, elaborate construction by means of FEM-analyses are a guarantor for a high durability, reasonable features such as an adjustable bearing play a high suitability for daily use.
New for 2017 we optionally offer our Ultra wheels with Ceramic hybrid bearings. As we do not settle with the second best, we only offer the highest quality of bearings from CeramicSpeed. The Danish specialists are renowned as the nonplusultra for years and have wins in about every single race globally available in their palmares.
All of our wheelsets are individually built by hand in our manufacture in Creußen, Bayern, to the tightest tolerances and with extremely high spoke tension. We refrain from the use of wheel building machines and invariably trust on the craftsmanship of specially qualified mechanics. The high experience with high-end-material allows a consistently high quality, the tight tolerance in lateral runout and radial runout a perfect runout and therewith a lot of joy with the wheels.