ROCKY KOM 31C 29er
The special layering of the T700 and T800 carbon fibre sheets gives ROCKYROAD rims a high lateral stiffness, while ensuring a high shock and vibration dampening capacity, combined with extremely low weights.
The asymmetric design allows to remarkably reduce the spoke tension difference between the two sides of the wheel, with a big advantage of lateral stiffness and stability.
The special inner profile makes the rim easily tubeless convertible using specific valves and tape.
The 31mm wide inner width fits perfectly with 2.3/2.4" tires.
The 21mm profile improves the absorption of vibrations in the vertical direction, but does not lose lateral stiffness, an important feature for obtaining lightning-fast accelerations and perfect lines.
ROCKY KOM rims are paintless. They come out of the mold as a finished product. Compared with the traditional process, there is no need to polish, so the original epoxy resin layer is retained on the surface, so they have a very strong scratch resistance.
Paintless process doesn't need any post-production like painting, water sanding, etc. So it's even more environmental friendly than traditionally made rims. No wastewater emission during the whole process.
ROCKY KOM rims must pass the stringent tests EN 14766 and ED 14781. These tests have been designed to ensure the strength and durability of individual parts as well as of the bicycle as a whole, demanding high quality throughout and consideration of safety aspects from the design stage onwards.
ROCKY KOM rims are intended for XC / Marathon use.
Suggested tubeless tape width: 30/32mm
Max pressure: 3.0 Bar
Minium use pressure: 1.4 Bar
Internal width: 31mm
Number of spokes: 28
YUNIPER ULTRALIGHT SP (Straight Pull)
Difficult internal structure and sophisticated milling-jobs on the outside structure were necessary to finalize these hubs. The hub-body is oversized and at the same time very light. The spoke holes are drilled with 3D angles in order to give the spokes a direction for 3.5 X lacing. We offer various conversion-kits to make the hubs compatible to fit to all major standards.
The hub body is made from forged 7075 T6 material - just a few manufacturers forge the hubshells with this material in order to get the maximum strengh out of the hubshell.
All other hub parts, such as the axles, the freewheel body and the sidecaps are made from 7075 T6 material as well.
The front and the rear axle have a diameter of 17mm at the bearing seats. Weight reductions were realized by removing axle material on the outside structure where it is not needed.
Another feature of our hubs are the anodized axles, which prevent from oxidation and corrosion.
The freewheelbody has 3 pawls, the gear-ring has 40 teeth. This configuration ensures a hub drive system which lasts. 40 engagements is a reliable choice which will still work after a certain usage, even the teeth and the gear-ring show a little bit wear. Other manufacturers strive for excessive engagement points. Due to the micro structure of the gear-ring and pawls, these systems tend to wear out quite fast and fail to work even just a little bit of water gets into the hub.
Front available in QR9 quick release, QR15 through axle versions, Boost 15x110mm, Lefty 2.0/SuperMax
Rear available in QR-135mm quick release, X12-142mm or Boost 12x148mm through axe versions
Made in ergal 7075
Internationl Standard 6 holes rotor fixing
Nitro sealed bearings: 2 front, 4 rear
The black surface treatment on the Yuniper NITRO-bearings makes them less prone to rust. Improved seales reduce the probability of water and humidity getting into the bearing.
Furthermore, we used a high end grease which protects the inner structure of the bearing and assures a very good lubrication. Internal clearances and accuracy classes are no foreign words to us.
Compatibility: Shimano/Sram 10/11s, Sram XD 11/12s, Shimano Micro Spline 12s
Ergal cassette body, with 3 pawls with 9° engagement, 40 P.O.E.
Weight: 107g (116g Lefty 2.0) + 217g
BERD POLYLIGHT SPOKES
Berd spokes are made from an advanced polymer called ultra high molecular weight polyethylene (UHMWPE) that has 12 times the strength-to-weight ratio of steel and floats on water. Berd spokes have an improved fatigue life compared to steel and are impervious to the elements.
Berd spokes use 14 gauge threads to connect to standard nipples the same way metal spokes do. Opposite the threads is a loop, which is pulled through the hub hole and secured with a rod. Berd spokes feature a 1.8mm diameter in the mid-span and are 2.5 grams per spoke.
Advantages of BERD PolyLight spokes:
- the weight of 2.5g allows to save almost 70/80 grams compared to the Alpina HyperLite spokes, that are the lightest steel spokes available on the market
- 12 times the strength-to-weight ratio of steel
- Berd spokes also damp vibrations much more effectively than steel spokes. This results in a more comfortable, smoother, ride. Berd spokes provide 200% better vibration damping than metal spokes.
The UCI, which regulates professional cycling, has specifically approved Berd spokes, so you can race Berd spokes from local crits to the Tour de France.
Made in USA
Every wheelset is supplied with 2 spare spokes/nipples
Nipples: DSN ergal
Not supplied with quick releases
Our wheels are built by hand in house by highly specialized personnel.
The Bikeonline staff uses the best professional tools on the market into each step of the wheelbuilding process. The P&K Lie truing stand is one example, it allows us to check perfect truing through precise decimal comparators (0.1 millimeters accuracy).
We build most of the tools we use, to fit the level of our builds, which require a high accuracy.
The use of different tensiometers as Park Tool, Pillar and DT Swiss allows us to reach the correct tensions of every spokes.
Each wheel is pre-stressed by hand to ensure that nothing has been settling during the early stages of use and that the spoke tension remains constant for a long time even under very high loads
This product is to be considered produced on request / on order, due to the high customization needed. It is therefore not possible to use the right of withdrawal or the cancellation of an order already confirmed.
See "Terms and conditions of use". Advance payment is required on this product.