The new BMW G450X Sport Enduro is a unique motorcycle that
completely redefines enduro riding. That’s because it’s been designed from
the ground up to deliver the sort of off-road traction dreams are made of,
with a brand new single-cylinder engine and a revolutionary swing-arm
design. The result is a bike that is quite simply unstoppable.
Thanks to a perfect riding position. Unstoppable
performance is not just about the frame, engine and chassis. It’s also about
the rider. The riding position – whether traveling uphill or down, sitting
or standing – is also of vital importance to proper control of the bike. The
G 450 X is exceptionally well balanced, with a slim body, and a long, .. at
seat. And for maximum freedom of movement, the fuel tank is located beneath
the seat rather than in front of it.
Thanks to an outstanding engine. The key to
unstoppable performance is an unbeatable
engine – an engine like the ultra-modern DOHC single cylinder unit found in
the G 450 X*. It is angled forwards, allowing for long, straight air
intakes, which in turn makes possible an optimum location for the fuel
injector and the two throttle valves. The engine provides punchy yet
supremely controllable responses right across the rev range. In addition,
the innovative positioning of the clutch directly above the crankshaft
minimizes the amount of torque it has to handle, and as a result its size
and weight can be signicantly reduced.
Thanks to an uncompromising suspension design. To be
truly unstoppable, you need outstanding grip, which means maximum ground
contact at all speeds and on all surfaces. The front of the G 450 X features
a fully adjustable Marzocchi upside-down fork with 300 millimetres of
travel, and effortlessly takes on even the bumpiest terrain. At the rear is
a fully adjustable Öhlins monoshock suspension system, also fully adjustable
and with 320 millimetres of travel.
Thanks to a revolutionary frame. Unstoppable
performance can only be achieved with original thinking, as seen in the
mounting of the rear swing-arm of the G 450 X. Its pivot point shares an
axle line with the drive sprocket, so ensuring that the length of the drive
chain – and as a result, the ef.. ciency of the transmission – is not
affected by the compression and rebound of the suspension. The swing-arm is
signi.. cantly longer than on other bikes with a comparable wheelbase, for
maximum ground contact and traction on any surface. Finally, the
ground-breaking frame features perfectly straight tubing, offering
exceptional structural rigidity.
Concept, Requirements and Features.
Over the last 80 years BMW Motorrad has made off-road history time
and time again. The marque is now closely involved in off-road sports as
never before and is premièring an uncompromising, pedigree sport enduro
in the attractive displacement class of the 450 model series: The new
BMW G 450 X – a motorcycle exclusively developed for the enduro sport
and the most demanding competitive races in the world. A machine that
is ready to compete the moment it arrives from the factory.
The background to the development of such a machine is the knowledge
that competition-oriented enduro motorcycles represent a parameter with
growth potential in the motorcycle market. Markets such as USA, Australia,
and also Spain, already register – nearly traditional – stable sales in the
off-road sector and BMW Motorrad wants to help shape and stimulate this
and other markets for the long term. Besides, smaller volume off-road
motorcycles open the gateway to both popular and professional motor sport
as well as offering enough potential to also help the young generation
to rediscover the fascination of motorcycles again. With the launch of the
G 450 X, BMW is also pointing the way for the upcoming generation
and towards sustainably securing the future of the motorcycle in general.
The engine with the latest fuel injection and computer-controlled three-way
catalytic converter is Euro III homologated and already meets the vehicle
emissions standards which are becoming ever more rigorous today for sports
events as well as for road vehicles. With these measures BMW Motorrad is
also taking a further step towards public acceptance of enduro sports in
future. The patented, unrivalled technical features of the new BMW G 450 X
make it a driving force and contribute to the advancement of technological
competition in this segment.
The introduction of the tough enduro BMW G 650 X challenge has already
pointed the way: with a frame and swing arm layout for improved offroad
traction, low weight, compact chassis, dynamic engine. BMW Motorrad goes
still further with the BMW G 450 X and is not content with constructional
features traditionally seen in the class. High-tech solutions have been
in both the engine and chassis in keeping with the cross-country sporting
tradition of the house and giving the marque a fascinating exclusive
The concept of the BMW G 450 X is based on keeping the mass concentrated
as near as possible to the centre of gravity and realising a vehicle
configuration that adapts perfectly to the requirements of off-road sport.
The central element of this concept is the amalgamation of the bearing axle
of the rear-wheel swing arm with the axis of rotation for the driving pinion
so there is no change in length of the chain on compression and rebound,
minimizing the effects of the final drive on the vehicle’s response. Further
consequences of this unequalled technical approach are a noticeably longer
swing arm for the same wheelbase as the competition and, with it, maximum
traction bringing concrete advantages in enduro sport with its extreme
demands on rider and machine.
Fundamental to the overall plan is the saving in length through the alliance
of the swinging bearing and pinion rotation axis. Not only does it enable
a longer swing arm, but the modern high-performance DOHC single-cylinder
engine with an output of 50 PS could also be positioned further to the rear.
The cylinder was more strongly tilted to the front, thus creating space for
long, straight intake tracts. In this way an ideal position was reached for
fuel injection nozzle and dual throttle valve fuel injection system. This
contributed to adapting the engine to meet the requirements of the Euro III
exhaust gas norm without loss of performance, which is anything but standard
in this motorcycle category. Further concept advantages include optimum
protection of the airbox and voluminous air flow due to its placement above
the motor in front of the seat. One consequence of the resolutely
centralised concentration of masses close to the centre of gravity
is the 8.5-litre tank under the seat. The filler manifold is positioned
an opening in the rear part of the seat. The reserve function is signaled by
a warning lamp in the cockpit.
The starter is placed in front of the engine; the battery is protected from
and easily accessible directly behind the control head in the upper
frame. The air filter is a square, flat wet element, fixed by a drawer
that makes it very easy, safe, clean and extremely fast to change. For this,
the right cosmetic tank cover (fixed with a quick-release fastener) is
and the air filter drawer is pulled out.
The intake funnel is positioned at the height of the control head whose
high-lying position is advantageous in water splashes or wherever there is
heavy dust development. The seat of the BMW G 450 X is made from a
piece of special foam plastic. Foregoing a cover and not having a
or sump as its base brings weight advantages.
Another distinctive construction feature is the relocation of the clutch
onto the crankshaft. A position that enabled an ingenious frame
The frame tubes were placed straight ahead of the swing arm pivot, bringing
maximum stiffness at the same time as minimum weight and lowest use
of material. Further plus points of this overall arrangement resulted for
cooler. This now had enough space to be realised in one piece. This saved
additional coolant hoses and and with a low weight, important for an
The development of the BMW G 450 X focuses on the ergonomic shape
and design of the active driving configuration. Starting from the steering
head to the rear section of the seat, the machine has an extremely slender
waistline exactly where the rider sits, offering maximum freedom of
Especially in a standing position, the rider benefits because the
absence of the tank at this point provides unrestrained clearance and the
motorcycle can be kept appreciably slimmer.
In this configuration the G 450 X is the first BMW enduro to be
developed for professional competitive racing. Like no other vehicle,
the advantages of the unique construction features are revealed to the full
in rugged off-road conditions; features such as the effective concentration
the masses around the centre of gravity, the engine effects eliminated by
the unique swing arm mounting, the resulting low wear of chain and pinion,
the extreme handling reminiscent of a 250 series motocross motorcycle
with prodigious tracking stability, the low weight, the powerful engine and
high-technology spring elements that offer the ambitious enduro sports
rider a number of package and design benefits in hard competition plus
riding pleasure. Measured by the options it incorporates, the G 450 X
is the most powerful off-road BMW of all times for hard offroad riding.
A dedicated team of specialist engineers and mechanics, who have also
taken part in intensive off-road sport privately for many years, has
this new model for BMW Motorrad under the motto “from passionate
professionals for passionate professionals”.
The BMW G 450 X continues the off-road expertise in the field of
enduro sport already consistently realised in the BMW G 650 Xchallenge.
It weighs about 40 kilograms less than the G 650 Xchallenge for roughly
the same output and, from the first draft to the last detail, is perfectly
to the requirements of the ambitious and success-oriented enduro sports
rider. As a completely special and absolutely exceptional motorcycle, the
BMW G 450 X is a genuine sports machine and it goes without saying that
it has all parts required for MOT approval as standard. This means that –
unlike other vehicles in this class – it’s no problem to ride the BMW G 450
to the track on its own two wheels.
The innovative, patented technology of the single-cylinder sports enduro
concept was put to the test in all relevant highly-competitive events
the 2007 season by experienced and successful racing professionals
such as Sascha Eckert, Simo Kirssi and Joël Smets who were able to
harmonise and further develop the concept. Today the motorcycle comes
ready for offroad racing and competitions at the highest level and with
approval for public road traffic without further modification straight from
Thanks to great traction at low revs, smooth engine output and fast revving,
superior riding qualities with extremely light handling, best balance in
“trial” sections and enormous stability at higher speeds, as well as
or well-versed enduro riders even enduro sport novices have no problem in
mastering this racing motorcycle.
To corroborate the extremely sporty enduro qualities, BMW Motorrad has
a works racing team that already took part in different Enduro sports events
with the G 450 X during the test phase and will continue to race it in the
Enduro world championship of the E2 class for example, or the German cross
country championship (GCC).
The worldwide market introduction of the BMW G 450 X is scheduled for
the middle of 2008.
Model Designation BMW G 450 X.
The model designation G stands for a new ‘G’eneration of sporty motorcycles
in the mid-range and lower cc segment, distinguished by its consistent
lightweight, easy handling, tracking stability and safe riding qualities.
power, the focus is placed on powerful, cultivated, dependable and economic
G stands symbolically for a well thought out ‘G’eneral concept and
down to the last detail, for the performance of the whole vehicle, for the
masterful harmony of all individual components in respect to an impressive
whole. G also stands for ‘G’reat riding qualities and pure, unadulterated
The range of possible uses of the G models covers a wide spectrum.
From the light allrounder ideal for touring to the agile super moto
and the robust hard enduro up to the genuine sports enduro with competitive
qualities. While the models of the 650 series are based on a common
technical basis, but are differentiated by the consistent configuration and
exclusive product features for their respective purpose, the high
machine G 450 X is the first representative of a motorcycle generation
that shows itself to be uncompromisingly competitive and success oriented,
representing the sporty spearhead of the G-series as a result. Common
to all G models is the high-grade substance of the product and proverbial
BMW quality, independent of where it is produced.
Specially tailored to customers’ riding styles and the abilities of the G
exclusive trainings are in preparation and will progressively supplement the
offers for the new motorcycle.
Development, Technology and Design.
From a technical point of view, the BMW G 450 X has no forerunners.
It is a brand-new development where features such as weight saving plus
perfect and uncompromising configuration to the requirements of the
competition-oriented offroad racing were at the forefront of the
for the developer.
Enduro racing places an enormous stress on the materials. The transition
to moto cross sport is fluid, the machines tuned to the limits of
are strained to the limits so their technology must satisfy the highest of
all demands. Due to the extreme range of use, the trials of the G 450 X were
extremely complex and totally new paths had to be taken in some areas. The
testing included the toughest enduro performance with metre-high jumps,
freezing cold up to extreme heat, water splashes and continuous racing
in extremely dusty surroundings with sand and stone impacts. The vehicle
must be able to withstand all these conditions reliably and sustainably.
any other type of motorcycle is confronted with such requirements in this
combination. The testing programme primarily included testing in a real
competitive environment as well as numerous test bench tests and trials on
special test tracks was correspondingly extensive and intensive. From the
very outset this meant the BMW G 450 X had to prove itself in the
where it wants to take part later in contests for the title: on the pistes
of national and international enduro and cross racing where the slightest
weakness of rider or machine can lead to defeat or failure. Long-term trials
in terrain in both Spain and Italy rounded off the overall programme until
serial production was reached.
The 449 cc single-cylinder DOHC 4-stroke motor of the G 450 X was
developed by BMW. The compact cylinder head of the short-stroke four valve
power unit houses the technical elements of the K 1200 S: for
example, the intake valves are operated by follower valves; the outlet
is implemented by tappets. A space-saving configuration distinguished by
high engine speeds. Optimum performance that meets the requirements of
the Euro III exhaust gas norm is realised by fuel injection with oxygen
regulation and a dual throttle valve system which ensure that the engine
reacts more sensitively to gas commands. The crankshaft and conrod are
fitted with rolling bearings and the weight-optimised two ring piston is
A balance shaft effectively reduces the vibrations typical of a
engine. The constant mesh five-speed gear – standard throughout the
450 series – was widely staggered for optimum connections in racing. The
primary coupling sits directly on the crankshaft and is configured as a wet
with a clutch diaphragm. In contrast to conventional concepts, the BMW G 450
clutch is considerably more compact and has a smaller diameter with the same
number of discs. Contrary to the conventional geared-down clutches, this is
possible because the clutch only needs to transmit a correspondingly reduced
torque on the transmission input shaft. The clutch is operated by a cable.
The engine is fed with oil by a wet sump lubrication system. Two oil pumps,
a pressure pump and a suction pump use the same volumes of oil to lubricate
the gearbox and the crankshaft. The two integrated oil sieves and oil filter
easy to access from the left side of the engine for replacement. The volume
of oil of approximately one litre can be checked via an inspection glass.
An intermediate shaft with integrated ventilation function transfers the
from the crankshaft to the gearbox and means that the crankshaft of the
G 450 X engine turns backWards. The cylinder is tilted forward by
30 degrees, enabling the centre of gravity to be moved in the direction
of the front wheel thereby benefitting the suspension. A further advantage
of tilting the cylinder is the creation of space for the intake air ducting
now come vertically from above and virtually straight, promoting optimum
The engine of the BMW G 450 X, condensed into 12 : 1, is started up by an
electric starter; an additional kickstarter is unnecessary thanks to a
battery and fuel injection with invariably reliable starting action. An
decompression function with a centrifugal force valve lifter reduces the
demanded by the starter. Even when the machine has to travel for longer
periods at higher revs in difficult and slow off-road sections, the engine
never excessively thermally loaded thanks to its large-volume, single-piece
water cooler. A fan designed for the series behind the cooler provides
sufficient air flow rate at low flow speeds.
The series exhaust system is made of stainless steel and the catalytic
converter is fitted in the silencer (absorption silencer). For exclusive use
competitive racing, optional purely sporting end silencers are offered as
special equipment and it is possible to switch to the extreme “race” mapping
stored in the engine control unit.
Despite the powerful alternator and electric starter, the high-performance
engine of the BMW G 450 X weighs no more than the aggregate of
competitor motorcycles (less than 30 kilogrammes). The exact power
and torque data are not yet fixed.
The chassis of the BMW G 450 X is a completely new development that
uses selected high-quality components and materials. The years of enduro
experience of BMW Motorrad flowed into the development of the chassis.
The main consideration in the geometry and overall configuration of the
chassis was to meet the especially high demands of off-road racing.
The results are excellent properties in terrain with ease of handling, great
maneuverability and extreme tracking stability.
Innovative frame concept.
The frame layout is based on the experiences of the development engineers,
the know-how from competitive racing and attendant research and development
work. The knowledge gained from earlier rally sport activities was also
incorporated. The frame of the BMW G 450 X is an absolutely new development
that differs in principle from all constructions of the competition. In the
main part it consists of thin walled, but high-strength stainless steel
tubes and is welded to the node points with forged parts deployed for the
purpose. No additional surface treatment is necessary. The entire main frame
weighs merely 8.6 kilograms and is distinguished by excellent stiffness.
The lower bow of the frame tubes runs directly from the swinging axle
to the steering head. On the other hand, the upper bow creates a direct
between the suspension strut mount and steering head. The wheel
forces are braced centrally on the frame over the suspension strut so that
light rear frame is bolted to the main frame and is formed by aluminium
square profiles now only needs to bear the weight of the rider. All in all
construction enables the optimum flow of force, requires minimum use of
material, thus allowing a hitherto unrivalled ratio of rigidity to weight.
The 18-inch rear wheel is suspended in a robustly dimensioned two-arm
swing arm made from aluminium square profiles which supports a directly
linked Öhlins central suspension strut with a generous spring travel of
320 mm. This high-technology element is variably adjustable in pressure and
outward stroke damping as well as in the spring pre-tension. The suspension
of the 21-inch front wheel is undertaken by a 45 mm upside-down fork
by Marzocchi that absorbs even the roughest bumps with a spring travel of
300 mm and is also fully adjustable.
A powerful brake system with double-piston floating caliper from Brembo
ensures the deceleration of the BMW G 450 X. The front single brake
disc has a diameter of 260 mm, the rear disc measures 220 mm. An ABS is
not usual in this class and, considering where it is used, the brake assist
on the G 450 X would also be counterproductive.
In order to live up to the the harshest off-road conditions, the BMW G 450 X
has a light, impact resistant and highly stable plastic under ride protection
fitted as standard and that has already proved itself in racing. The
also has a double-butted Magura aluminium handlebar that guarantees
optimum control on all pistes.
Patented swing arm mount.
The real finesse in the chassis sector and a unique feature of the
BMW G 450 X is the coaxial mount of the swing arm and chain pinion. The
swing arm pivot has been mounted through the hollow gearbox output so
that there is no longer any change in length of the chain on compression and
rebound over the entire spring travel. The chain tension remains constant
independent of the compression position; the pinion, chain and chain ring
subject to less wear than in conventional constructions. A positive effect
the riding characteristics is that the effect of changing loads on the
is now noticeably reduced.
Thanks to the patented coaxial mounting of the swing arm and drive chain
pinion plus a wheelbase at competition level, the swing arm is 30 mm longer,
markedly improving the traction properties. The rear wheel remains longer
in contact with the ground in all situations, keeping the driving force
the piste. Also, compared with the competition, a significantly greater
adjustment range of the rear wheel results which means different pinion
chain ring combinations can be used with the same chain with no problem.
When a pinion has to be replaced, the swing arm must be removed; however,
in comparison to conventional concepts, this is not a particularly time
consuming task. An experienced mechanic can replace the pinion in about
15 minutes and, because of the much lower wear of the entire final drive,
the pinion needs to be replaced less often then by the competition.
The looks of the BMW G 450 X immediately make clear the affinity to
BMW Motorrad. The dynamic “Flyline” allows the new motorcycle to be
identified as a typical member of the BMW enduro world, the most striking
element is the typical family beak – also the distinguishing characteristic
shared by all GS models.
The optical appearance also expresses pure sporting performance with the
associated aggression. This results in the look and feel of a fascinating
that appears with the right to ride to win in competitive races.
The colour concept of the G 450 X is oriented to the G 650 Xchallenge.
The standard colour is “racing white” with blue accents typical of BMW which
highlights the affiliation to the G model family and the new, sporty enduro
line from BMW.
The exact technical data of the BMW G 450 X have not yet been finally fixed.
The maximum output is around 37 kW (50 PS) with a best torque value of
approximately 48 Nm. The overall weight with full tank is about 120 kg which
means the BMW G 450 X is lighter than the current best weight values in this
class. This value is all the more impressive because this is a vehicle with
injection, catalytic converter, electric starter and Euro III homologation
points the way to the future of the enduro sport.
The exact geometrical data of the chassis is subject to the last fine tuning
activities and will be made known at a later date.
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