Extralite E BONE QRC & UltraFront SX [en]
updated his range with a new crankset, the E BONE QRC
. Entirely made out of aluminium, it features very
large bearings (5mm larger than Campagnolo or Shimano bearings) for maximal stiffness.
- Size: 172,5mm
- Weight: 485g l’ensemble (BSA68)
- Diameter: 110mm
- Bearings: 6806 2RS extérieurs 30-42mm
- Spindle: 22mm integrated
- Finish: Black anodized
- Logos: CNC machinned and laser etching
- Q-Factor: 138mm
The crank arms are particularly worked and lightened, especially their internal face. These specific shapes are the result of finite elements analysis and they allow a high weight
save without compromising the stiffness or the length of life.
Beside this new, Extralite proposes from now on, a new hub which is
very interesting. Called UltraFront SX, it is as well as the crankset, fully made out of aluminium. The black anodized’s logo is laser etched, the bearings are
oversized contrary to M5 or American Classic for example, and directly face the exterior. the bearing preload adjustement can still be set through the
MicroTuner for ideal stress on the bearing. The whole procedure can be performed by hand thanks to the knurled screw.
As light as a Tune Mig45 for an excellent reliability, knowing Extralite, ths hub is pretty affordable. Count 149 euros, which is the same price as an UltraFrontSL, that will probably be
replaced soon or late, at least for road racing. Indeed, for MTB, this SL hub is now available in 32 holes.
* Body: Aluminium 7075 Tx CNC machinned, self alignement flanges
* Axle: Aluminium 7075, 14mm of diameter
* Drillings: 16, 18, 20, 24
* For radial lacing
* Bearings: 6802 2RS
* Preload adjustement by hand with the microtuner
* Weight: 49g
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