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KTM Moto3 Race Bike
KTM’s new Moto3 racer. As expected in the new
prototype class, which replaces 125GP with 250 four-strokes next year, the bike
is impressively exotic. A cast swingarm pivot connects to an impossibly dainty
steel-trellis frame. The rear subframe and seat appear to be self-support carbon
fiber. The front wheel is a novel large spoke/deep carbon rim design and the
front brake is a tiny little single-pot radial affair.
The rear wheel appears to be much more conventional than the front (forged
Marchesini?), is held on with an under-braced swingarm and clamped by a radial
single-piston brake caliper. Don’t expect that Akrapovic to do much silencing.
The front wheel appears similar to a Rotobox with its very thick spokes and
deep-section rim. If the wheel is constructed in a similar fashion to the
Rotobox, then those spokes are hollow. That design, along with the deep rim,
eliminates that traditional weakness of carbon wheels — fracturing under
torsional loads — while allowing an unprecedented light weight. The hollow
spokes also increase the volume of air under pressure in the tire, leading to
less temperature variance and greater tire compliance. Unfortunately, the final
Moto3 rules only allow magnesium or aluminum wheels, so this wheel won’t make it
to the track.
Like other GP classes, Moto3 requires a prototype frame, but the class cracks
down on engine specs, mandating the use of a single-cylinder four-stroke with a
bore of 81mm and a spec ECU. Revs are limited to 14,000rpm (which is the redline
for this KTM motor) and variable valve timing or exhaust track lengths are
allowed. Engines must be available for sale for 12,000 Euro or less and the
inclusion of expensive performance parts is forbidden after that 12,000 Euro.
KTM is employing a radial, titanium valve arrangement and says the whole engine
weighs just 55lbs.
Source
HFL
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