Innovative suspension technology for supersports
performance of the highest standard.
Through its consistent concept, the S 1000 RR, as a genuine
supersports machine, offers not only the most outstanding
drivetrain technology for optimum performance at all times, but
also comes with truly exceptional riding precision ensuring
unparalleled riding dynamics and almost playful agility. So the
suspension and running gear of the S 1000 RR likewise offers the
highest standard of excellence and sporting performance.
The “heart” of the suspension is the aluminium
bridge frame weighing just 11.98 kg or 26.42 lb, tilting the engine
to the front at an angle of 32° as a load-bearing element.
While this type of frame is already state-of-the-art in large
sectors of the supersports segment, the engineers at BMW Motorrad,
in developing the S 1000 RR, focused consistently throughout the
entire process on the need for maximum riding dynamics. And
particularly through their close communication and cooperation with
the departments responsible for drivetrain development and design,
they ultimately created a suspension and running gear setting new
standards in many respects.
Lightest supersports in the 1000-cc class with
ABS.
Weighing just 206.5 kg or 455.3 lb in road trim and with a full
tank, the new S 1000 RR is the lightest supersports with an engine
capacity of 999 cc and Race ABS. But this alone is not suffi cient
to explain the outstanding handling qualities of the S 1000 RR
quite in every respect. Rather, it is particularly the
machine’s ideal centre of gravity carefully set-up in
elaborate tests as well as the geometry of the running gear that
makes handling of this kind possible in the first place. The
steering head angle of 66.1°, for example, is very steep, wheel
castor of 95.9 millimetres or 3.776" is appropriately short.
In the process of determining the ideal stiffness of the frame
combined with minimum weight, BMW Motorrad – like in nearly
all calculations and developments for the new S 1000 RR –
focused consistently on computer models, simulations, CAD
technology, and countless riding tests.
In conjunction with optimum ergonomics, the slender structure of
the motorcycle also helps to provide a particularly good and safe
riding experience as well as very smooth and easy handling.
Aluminium bridge frame with the engine serving as a
load-bearing element.
The result of this development process is an aluminium bridge
frame made up of four castings. This particularly confi guration
serves above all to meet the great challenges in designing a
motorcycle with a very slim waist and a large airbox. The spread of
stiffness values follows a wide range of calculations and
simulations as well as many riding tests taking all kinds of
variants into account.
The steering head and the two side sections with their
integrated engine mounts are manufactured in a tip casting process,
while the rear section with the rear engine mount, the swing arm
supports as well as the mounting points for the footrests and
kinematic elements are made in a low-pressure die-casting process.
A high-precision welding robot then assembles the individual
components in the Aluminium Competence Centre at BMW
Motorrad’s Berlin Plant to form an extra-stiff and sturdy
unit all round.
The rear frame section on the S 1000 RR is a welded structure
made up of square aluminium profiles bolted on to the frame. Again,
this combines low weight with superior stability and robust
strength appreciated particularly by competition riders and teams
on the race track. A further advantage of this configuration is
that it allows optimum access to the spring strut, for example when
changing the set-up for specifi c requirements.
Long rear-wheel double swing arm for optimum
traction.
Consistently seeking to give the S 1000 RR optimum performance
in every respect, the development team at BMW Motorrad, in
developing the suspension and running gear, concentrated in
particular on the mechanical grip of the wheels and, accordingly,
on the overall need for supreme traction. These requirements are
fulfi lled above all by the long rear-wheel swing arm helping to
reduce lift-up and wheel relief forces on the rear wheel thanks to
the drive and thrust forces conveyed by the upper and lower chain
element. In practice this means optimum transmission of drive
power, superior performance and a smooth and reliable response at
the rear particularly while accelerating, with substantial
advantages for the rider.
With its effective overall length between the swing arm rotation
point and the rear wheel axle of 593 millimetres or 23.35", the S
1000 RR comes with one of the longest swing arms in the supersports
segment. The swing arm mount in the frame also helps to promote
supersports performance, particularly on the race track, with the
inserts for the swing arm mounts in the frame serving to vary the
height of the swing arm rotation point and, accordingly, the
anti-squat effect when accelerating, thus meeting the rider’s
personal requirements and the particular requirements of a specifi
c race track or stretch of road.
For reasons of weight and to ensure maximum torsional stiffness,
the confi guration chosen is a double swing arm made of deep-drawn
aluminium plates with particularly thin walls as well as a cast
dish at the bottom. This cast dish houses all components subject to
high mechanical loads such as the kinematic pivot and junction
points, the swing arm mount, and the rear wheel support. A further
advantage of the cast dish at the bottom is the reduction of
tolerances in production to an absolute minimum on all of these
kinematically relevant points.
Together with the cast dish, three separate components made of
deep-drawn aluminium plates with wall thickness of just 2.5
millimetres or 0.098" form a torsionally stiff and very light swing
arm body weighing just 6.22 kg or 13.72 lb. On the left-hand side
the drive chain runs through the swing arm in a shaft.
The wide range of adjustment on the rear axle support of 45
millimetres or 1.77" provides the option to change the position of
the rear axle, moving forward by up to 17.5 millimetres or 0.69"
and backward by up to 27.5 millimetres or 1.08", depending on
whether the rider is looking for a reduced wheelie effect
(adjustment to the rear) or more traction (adjustment to the
front).
Wheelbase thus varies from 1,414.5 millimetres or 55.69" to
1.459.5 millimetres or 57.46", with the standard wheelbase under
DIN unladen weight measuring 1.432 millimetres or 56.38".
Fully adjustable spring elements with very high damping
reserves.
Seeking to give the new S 1000 RR optimum suspension qualities
with perfect running gear, the engineers and specialists at BMW
Motorrad decided to give the new machine a central spring strut
with an adjustable spring base as well as adjustable damper inbound
and rebound control. A further advantage is that this configuration
allows the adjustment of low-speed damping (for example on long,
stretched-out undulating surfaces) and high-speed damping (eg on
short bumps) on the pressure stage (inbound), thus offering perfect
set-up qualities with maximum precision.
The spring strut is activated by compact and light kinematic
levers and makes allowance for the wide range of use also on the
race track by offering a wide range of adjustment as well as very
substantial damping reserves. Overall spring travel on the rear
wheel axle is 130 millimetres or 5.12", with 90 millimetres or
3.54" positive and 40 millimetres or 1.57" negative spring
travel.
Using eccentric inserts on the upper spring strut support, the
rider is able to raise the entire rear end of the S 1000 RR by 10
millimetres or 0.39" on the spring strut support, thus taking his
individual requirements and the specifi c character of the
respective route into account.
The S 1000 RR meets equally high demands in terms of riding
dynamics also on the front suspension. The confi guration used up
front is an upside-down fork with its fi xed tube measuring an
ample 46 millimetres or 1.81" in diameter. This size alone is quite
unique in the supersports segment, offering far greater braking
stability and better feedback than the usual fixed tubes measuring
43 millimetres or 1.69" in diameter.
The fixed tube is mounted on the steering head by a light
aluminium steering shaft tube running in two extra-large ball
bearings as well as two fork bridges made of forged aluminium in
the interest of minimum weight. To adjust the height of the
motorcycle at the front to the personal needs and preferences of
the rider as well as the route he is taking, the immersion tube at
the front provides an appropriate overlap, overall adjustment
travel of 15 millimetres or 0.59" allowing the front end to be
lowered by up to 5 millimetres or 0.197" and raised by up to 10
millimetres or 0.394".
The upside-down fork comes with cartridge inserts inside, that
is a separate hydraulic piston cylinder system, and allows
adjustment of both the spring base as well as damper rebound and
inbound action. Here again, the sensitive behaviour and response of
the suspension, the wide range of adjustment and very significant
damping reserves even on the race track offer superior flexibility
and individual choice. Overall spring travel is 120 millimetres or
4.72", with 75 millimetres or 2.95" positive and 45 millimetres or
1.77" negative spring travel.
To allow simple and reliable control at all times, the
individual settings on both the spring strut and the upside-down
fork are clearly specified by numbers ranging from 1 to 10. So
there is no need to count up to 30 clicks in the usual tedious
process required on some other models in this segment.
A further advantage is that both the inbound and rebound stages
are colourmarked, again – like many other features –
confi rming the very practical approach taken by the development
engineers at BMW Motorrad.
Very light and extra-stiff aluminium
wheels.
Designed and confi gured from the outset as a supersports
machine offering supreme performance, the new S 1000 RR obviously
also comes with appropriate wheels. These are fi ligree ten-spoke
pressure-cast aluminium wheels in truly dynamic design offering
optimum qualities in every respect.
Once again, one of the primary objectives in developing the
wheels was to reduce weight to an absolute minimum while retaining
a supreme standard of all-round strength and stability. Precisely
this is why the brake discs do not come with a separate mount and
the additional bolts which would be required for this purpose
– instead, the brake disc rings are fi tted directly around
the wheel hubs. This alone and the particular construction of the
wheels makes the wheels on the S 1000 RR the lightest in their
segment.
On the front wheel the brake discs are connected directly to an
extra-strong wheel star, without any additional mounting or
attachment elements. The fi ve radial arms of the star extending
out of the hub form individual forks supporting the rim
consistently by means of ten cast spokes.
This fork configuration gives the front wheel excellent radial
stability in shape also under high wheel loads and at the same time
caters for the signifi cant circumferential forces acting on the
wheel above all when applying the brakes.
This design of the wheel tailored to load conditions and
requirements helps to keep the spokes very filigree and light, not
only reducing the weight of the wheel, but also providing a very
light and transparent look.
Drive and thrust forces are transmitted on the rear chain by
means of an integrated thrust damper. Tyre dimensions of 120/70 ZR
17 at the front and, respectively, 190/55 ZR 17 at the rear
represent the latest state of the art in the supersports
segment.
Radial brakes for excellent stopping power.
The brake system on the new S 1000 RR lives up to the high
standard of performance on the drivetrain and suspension in every
respect. Here again, therefore, the development specialists at BMW
Motorrad have given utmost attention to meeting all the demands and
wishes of the most discerning supersports customers.
To fulfil these requirements, the front wheel comes with a
double disc brake incorporating two steel brake discs in floating
arrangement and measuring 320 millimetres or 12.60" in diameter and
5 millimetres or 0.197" across.
The hydraulic system incorporates a radial master cylinder with
its master piston measuring 19.05 millimetres or 0.75" in diameter
as well as two radially mounted four-piston fi xed-calliper brakes
from Brembo with brake pistons 34 millimetres or 1.34" in diameter
and split friction pads made of sintered metal.
Brake lines in steel tissue cladding and therefore very strong
and stable serve to convey the brake forces exerted by the rider
with his hand in an optimum, smooth and absolutely reliable
process.
The entire brake system on the S 1000 RR stands out, as a
result, through its crystal-clear pressure point, optimum brake
effi ciency and clear dosage of brake power with maximum resistance
to fading and high temperatures not only on the road, but also and
in particular on the track.
The rear wheel comes with a hydraulically operated single-disc
brake supporting the brake at the front. Diameter of the steel
brake disc fi tted fi rmly in position is 220 millimetres or 8.66",
disc thickness is 5 millimetres or 0.197".
The rear-wheel brake is operated by the footbrake lever acting
on the 12.7-millimetre (0.50") master piston in the main brake
cylinder and from there, via the pressure-stable, steel-clad brake
line, on an extra-light single-piston floating calliper likewise
featuring sintered metal pads.
Race ABS with four pressure sensors for extra-precise
control and dosage.
BMW Motorrad Race ABS specifically developed for supersports
requirements and available as an option straight from the factory
ensures maximum active safety when braking, again making allowance
for the outstanding performance and unique character of the S 1000
RR.
To comply with various riding conditions such as a wet surface
(“Rain”), regular road conditions
(“Sport”), a race track with supersports tyres
(“Race”) or a race track with slicks
(“Slick”), the rider is able to adjust the
characteristic features and performance of the engine simply by
pressing a button, thus giving Race ABS the right configuration and
input at all times. These characteristics interact with the
respective riding modes and are carefully coordinated with one
another for maximum safety at all times.
This new BMW Motorrad Race ABS is a brand-new development from
the ground up, once again signifi cantly lighter than all former
partly integrated systems. With the control unit weighing just 1.65
kg or 3.64 lb and with overall weight of just 2.5 kg or 5.51 lb,
BMW Motorrad Race ABS offers excellent qualities specifically for a
supersports machine. And apart from its low weight, the system
stands out in particular through its further improved control and
operating functions.
Over and above the excellent overall set-up, this superior
control, performance and brake management is ensured by the use of
four pressure sensors which, in conjunction with the very elaborate
rear-wheel lift-off detector, allows even better distinction than
before between a bump on the road and the rear wheel locking.
Pulling the handbrake lever, the rider activates the double-disc
brake at the front, while brake pressure on the rear-wheel brake
remains at a low level. Pressing the footbrake lever, the rider
then activates the rear-wheel brake as well. In the Race and Slick
Modes, the rear-wheel lift-off detector does not intervene in the
rider’s braking action, allowing him to apply the brakes even
harder whenever required, for example on slightly undulating
surfaces and where the motorcycle has adequate grip.
In the Slick Mode the rider still has ABS on both wheels when
pulling the handbrake lever alone. Then, pressing down the
footbrake, the particularly experienced rider is able to go into a
brake drift without having to forego the benefi ts of front-wheel
ABS. In other words, ABS no longer cuts in on the rear wheel when
pressing down the footbrake lever.
As soon as the rider pulls the handbrake lever, the pressure
sensor integrated in the front-wheel control circuit switches on
the brake light and the pump, the latter immediately delivering
brake fl uid through the open valve to the rear wheel circuit.
The pressure set in the rear wheel circuit is measured by a
second pressure sensor and is controlled according to the
distribution of brake power required and the brake force generated
by the rider. The third pressure sensor in the rear control
circuit, finally, measures the brake pressure activated by the
rider‘s foot.
Use of a fourth pressure sensor in the front wheel circuit
allows further improvement and even finer control of front-wheel
brake pressure compared with former BMW Integral ABS II, since the
system is able to compare the actual level of pressure in the
control and wheel circuits.
As a result, there is now no need for the usual throttle blades,
which serves to provide an optimum pressure point and allows
perfect dosage of brake power. All pressure sensors are integrated
in the pressure modulator and the overall confi guration of the
system with its integrated pressure sensors now also avoids the
need for a brake light switch.
Yet a further option is to deactivate Race ABS completely for
special purposes and requirements.
While Race ABS gives the rider valuable support and therefore
represents a very signifi cant safety factor when applying the
brakes, it is not able to re-defi ne or change the laws and limits
to riding physics. Hence, even with this most sophisticated system,
the rider may still misjudge a situation or make a mistake on his
machine leading, should the worst come to the worst, to an
accident.
Race ABS nevertheless helps the driver use the supreme stopping
power and brake qualities of the S 1000 RR much better and more
safely. But even Race ABS cannot provide maximum stopping power at
the physical friction limit when leaning over to the side, and does
not relieve the rider of his responsibility to ride safely and
carefully.