Italian wheel manufacturer Fulcrum has today announced an update to its best road bike wheels, overhauling its mid-depth ‘Speed’ race wheelsets with the launch of the Speed 57 and Speed 42 models.
Replacing the existing Speed 55 and Speed 40 respectively, this new pair of wheelsets are 2mm deeper than their respective predecessors, at 57mm and 42mm, as reflected by their model names. They are also 4mm wider internally, and 2.8mm wider externally, and Fulcrum says they’re lighter, more responsive, with better handling too.
They’ve also been treated to a visual makeover, with the large Fulcrum wordmark replaced with a subtle laser-etched logo, and the red accents replaced with a single small chrome silver tab at the hub, making them much less likely to clash with your frame’s paintwork.
The weight drop sees the 42mm wheelset tip the scales at 1,410g, and the 57mm weigh 1,495g. This is aided – if not entirely facilitated – by a redesign of the hubs, which Fulcrum says now have a 10% smaller central body, 40% smaller flanges, as well as a new 36-tooth ratchet drive with a 10-degree pick up.
The handling, which Fulcrum says is improved to the tune of 7% for the Speed 42 and 17% for the Speed 55, is quantified based on a measure of the energy dissipated when changing the direction of the wheel on a testing jig. The more energy taken to turn the wheel, the slower or harder it is, which Fulcrum believes is correlative to on-the-bike handling.
A similar test, which measured the energy used to make the wheel spin from a standing start, calculated reactivity. Again, less is better, with the Speed 42 taking 3% less energy than its predecessor, and the Speed 57 being 10% lower.
Leaning on Fulcrum’s existing technology somewhat, the new wheels use ‘Two-way technology,’ meaning they can handle both tubeless and clincher tyres. Their bead is hooked, so should have no tyre compatibility issues, while the fully-sealed rim bed replaces spoke-hole-convenience with improved air retention and added strength. Getting around that lack of spoke holes is another of Fulcrum’s technologies; MoMag, which allows wheel builders to use a magnet to drag the internal nipple around the rim and into place inside the plastic support that helps avoid corrosion.
The hubs are built using ‘USB’ (Ultra…
Click Here to Read the Full Original Article at CyclingNews RSS Feed…