Peter Bom
@PeterBom4
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Motorbike racing specialist. 2D Datarecording.
Assen, Nederland
Joined February 2018
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Pretty busy,
@AleixEspargaro
left hand. This is what I think the levers do: a cluch (just to get away), a two fingers rearbrake, an index finger operates the fork starting device, a thumb operated rear ride height.
Probably: index is manuel and thump is automatic RH.
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Martin's Duc; green circles from top down: Radiator cover to slow down engine cooling. Oval shaped covers to increase the airflow to cooler. 8 infrared sensors for tire outside temp. 3 axis acc sensor, helps calc susp effectivenes by comparing the acc with a sensor on 3 clamp.
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Moto3 racing at
@MotoGP
is all about 'marginal gains'. A few Nm here and there in the powerband can make all the difference on these small engined bikes. This here is
@KTM_Racing
's way of working with the pulses in the exhaust gases.
@ZS_Racing
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This is the
@MotoGP
bike camera system.
Connected to the bike's ECU to link video with GPS speed, lean angle, throttle & rpm.
Sends out to several antennas round the track.
Weights around 1.3 kg.
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Warming up
@MotoGP
motorcycles is done with a small dummy tank. The real gas tank is only installed after all checks.
Here we see the 'warm up petrol tanks' from
@lcr_team
and
@YamahaMotoGP
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Rossi is just 1,3 sec slower than the fastest man of FP2, and this makes him the slowest man of day 1 here at the
@MotoGP
in Valencia.
During qualifying in 2011 here, that - 1.3 sec would have meant P5. Things have changed a bit over time ;-)
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This can happen when a
@MotoGP
rider loves cycling, and his team loves him very much.
Italians know how to pamper their riders.
@AleixEspargaro
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This i ran into behind the
@suzukimotogp
pitbox: it's
@Rins42
mechanic Tiziano Verniani's
view on his ideal E-bike. Incl. cast wheels, M3 slicks, ups fork and dummy tank holding the battery pack. Where did he find the time to make this beauty?!
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Here's visible what
@KTM_Racing
's double airbox entrance looks like, providing cool air and filling up areas of low pressure behind the fairing.
@MotoGP
@matoxley
@GPMag_
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Rider performance wise, Brad Binder was my biggest and most positive surprise from yesterday's MotoGP race.
Take out the 25 seconds he lost getting off track, his race duration was for the podium. Rookie. KTM.
Let that sink in.
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Unbelievable actually, but this narrow chain and this thin sprocket transmit more than 250 hp.
@YamahaMotoGP
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State of the art: Here's a rear shock from
@KTM_Racing
and it's printed in 3D. Space is severely limited in the
@MotoGP
class but printing allows them to incorporate passageways and spaces where conventional machinig could not.
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Introduced in Portimao 2022, this is
@MotoGP
's shoulder cam hardware, fitted behind the riders neck.
initially 0.75 kg, now down to 0.5 kg.
Only 3 exist at the moment.
Making a total of 5 cams / bike.
This angle provides a fantastic insight into riders body & hand movements.
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One year ago, Suzuki dropped the bomb; they where going to leave
@MotoGP
. Many of the former Suzuki crew i spoke to this wekend all remember very well the shock. At the end of the testday, they where all called in to pitbox for the shock announcement that we all still feel.
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More than half of Moto2 bikes have replaced their drive-by-wire throttle with an 'old skool' cable controlled throttle. This is because of the better feedback, the more 'natural' feeling that riders can get with the engine. Crucial for controlling the slide, improving the drive.
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'Holeshot' activation on
@jackmilleraus
's Ducati GP21.
This years bike has 2 switches on the triple plate.
That's how they drop down the rear, and clamp the front down for teh start, effectively creating a sprintbike for the run to the first corner.
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Suzuki considers rider ergonomics very important. Note the special knee pads on the fuel tank, to increase stability under hard braking and reduce fatigue.
In 2021, expect more like this from other manufacturers.
Photos courtesy of WEB Mr. Bike
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In modern motorbike racing it is super important that riders can use the rear brake properly.
This Moto2 brake pedal has been adapted so that the rider can continue to operate it during right-hand turns.
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Honda HRC have now Alex Baumgartner (designer of Kalex Moto2 bikes) in the pitbox here at the Sepang
@MotoGP
test. According to Alex this is on a consultancy basis. Told me its"a great opportunity for him to learn more". Interesting to think who's going to learn the most here
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Not allowed in
@MotoGP
but it's every race engineers wet dream: 'moveable aero'.
The German Aerospace Center (DLR) crafted a remarkable biomimetic wing prototype that enhances real-time aerodynamics, leading to decreased fuel consumption.
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This black hose, when hit by a tire, creates a pressure wave that triggers the tracklimit sensor. It’s around 100 mm behind the curb. A MotoGP rear tire is 200 mm wide, So a rear tire that’s only halfway over the curb can trigger the sensor. Not easy to judge for a rider.
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Check the left hand, thats loose like Lorenzo.
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The 2024
@KTM_Racing
Moto3 bikes can be started with a modified power drill.
@MotoGP
@GPMag_
@matoxley
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Aprilia's carbon swingarm (seen here upside down), as spotted in Misano.
Note that there seems to be no aluminum inserts at the rearwheel axle clamping point.
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A new Öhlins Moto2 front fork with oval outer tubes, spotted first at the Portimao
@MotoGP
Lateral forces should make them bend a bit, absorbing bumps midcorner, while longitidinal remaining rigid. Not new, will it remain this time?
@matoxley
@GPMag_
@2DDatarecording
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8 infrared temperature sensors to keep measure which side of the front tire gets what temperature. That is on top of the air's temperatrure and pressure sensor inside the tire.
@2DDatarecording
@matoxley
@GPMag_
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Exhaust tuning as seen on the gasGas moto3 here in Jerez. Wrapped to keep the gas temp. high (flows faster) and an extra chamber to add a resonance effect right where they want it in the rev range. Marginal gains? Maybe, but in the Moto3 class, they value little improvements
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Honda was seen in Misano with 2 axis acceleration sensors all over the bike, following Ducati's 3 axis sensors. Acceleration sensors can measure vibrations and therewith movements, also relative to each other.
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The
@MotoGP
Yamaha M1s are equipped this year with a new dashboard from
@2DDatarecording
, specially developed to have all the functions for the motoGP in a small space.
Soon also available for other motorcycles and classes.
Perfect picture (as always) by
@GarethHarford
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Seen at KTM: this fork extender that increases the volume of the fork leg. As a result, the fork (plus the front tire) builds up the pressure more linearly toward the end of the stroke. Goal: front tire feel under hard braking. LH pic. by
@motomatters
.
@matoxley
@GPMag_
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Big thanks to Maria
@TrackhouseMoto
for supplying us coffee when the mediacentre could not.
@MotoGP
Jerez test with
@denkmit
&
@matoxley
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Mugello is traditionally the race where everthing Italian comes up with a special livery. This here is Miller's Pramac Ducati. Wait for sunday, when for sure there will be more like this, in all classes.
Bloody Italians, can't help themselves but to make things beautiful.
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This bike, as seen here in the Honda museum in Motegi, has probably passed you a couple of times in your endurance career
@matoxley
?
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Broke my hip in an incident with the MTB. Had surgery, couple of screws there.
It's my first hip thing, can't recommend it ;-)
Docters say it will be fine.
Thumbs up to the ambu driver,riding the mtb trial to get me out of there. My hip however disagreed with that choise..
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High reving engines as used in
@MotoGP
require pneumatic valve springs, with the exception of Ducati with their desmodromic valve actuation.
Here in Jerez we see a KTM RC16 with an airbottle that pressurizes the pneumatic system.
@ZS_Racing
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Ducati's controls for the auto ride height adjustment is: Both rotary knobs on the triple clamp are used for the starting position, frt + rear.
The yellow circled buttons are for activating and deactivating the auto ride height at the rear.
@MotoGP
@ducaticorse
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Thanks for all the nice messages and to everyone here who supported me after this unexpected step from
@ziggosport
.
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Hood open in
@MotoGP
, waiting for the remote starter motor. Ground effect means that the side fairing must remain smoothly finished.
@matoxley
@GPMag_
#oxleybommotogp
podcast.
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Don't crash in Turn 5 here in Jerez. It's way too fast for that, besides, the stones in the graveltrap are 'Portimao' huge.
@MotoGP
@ZS_Racing
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This is what i saw earlyer this week, but hat to promise not to tell you about: Apilia's new RSV with all the MotoGP DNA and Aero. Is this the perfect trackday bike?
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Last week I filled in as crew chief in the Malaysian SBK with Horizon racing team. Two 2nd places made the team smile. May is hot enough here by the way.
@matoxley
@GPMag_
@alphaRacing
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Honda RC213V from Marc Marquez, as seen in Assen at the MotoGP. Check out the 2 tiny wheelspeed sensors, constantly crosschecking each other signals.
You can tell he's using the rear brake a lot by the fact that HRC fitted a thick, ventlated rear brake disk on his bike.
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My
@MotoGP
Jerez race summary:
Pecco is back, making the best of a superior Duc.
Faultless Binder takes a deserved 2e
KTM's are rockets at the start.
Race Direction penalty's are all wrong, it's a lottery.
Dani is the worlds fastest testrider.
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Thanks for supporting the Oxley Bom MotoGP pod.
A 'half link' is used with race bikes where it allows the setup to stay as close as possible to a desired swingarm lenght, regardless of the final ratio.
Swingarm lenght = wheelbase / weight balance / anti squat (pivot height).
@PeterBom4
I just heard the Patreon Only podcast about the chains with Daisuke-san. What's the concept of the "Half Link"?? Would like to understand this deeper. Thanks
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Two air valves in
@MotoGP
's front wheels. They are there so the teams can 'washe / rinse' the tire volume with 'dry air' , for the race only.
Less moisture means less rise in pressure as temperature rises. This is
@Michelin_Sport
's dry air installation.
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Another day, another
@MotoGP
starter motor. This 2023 starter from
@HRC_MotoGP
is my personal favorite. slides into the cluch, backtork is taken care of by the three pins slotting into the crankcase.
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One could easely see famous French
@MotoGP
engineer Guy Coulon thinking here: "what if i fit a neat little turbo on it, would they notice"?
Mind you, this man could actually do this.
Proper old skool tech magician.
@motomatters
@matoxley
@KTM_Racing
@GPMag_
@Tech3Racing
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Ducati's external starter motor. Apparently there is quite a bit of backtorq during starting, given the widely spaced handles. Depending on the type of aero, a hatch on the fairing sometimes needs to be opened for access. Aprilia tomorrow.
@motomatters
@matoxley
@GPMag_
@MotoGP
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Thursday's TechFact: )One of the hardest things to produce at the moment is the springs for MotoGP. It is apparently very difficult to make springs with the linearity required, to have exactly the same stiffness across their stroke. Didn’t expect that.
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My local Assen supermarket knows what's soon coming to town.
@MotoGP
@ttcircuitassen
@motomatters
@matoxley
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I think the fork position (= pressure) is used to automatically lower the rear at the right time during the start of acceleration.
Ducati ('19) and Aprilia use the canisters of an Ohlins shock absorber for this. No electronics allowed here. Aprilia Pic by
@CormacGP
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Next in line of
@MotoGP
starter motors is this carbon beauty from
@KTM_Racing
It's small and can be operated with one hand.
There are thin combined hold & driven shafts, plus a nice Deutsch connector with screw-on cap for the charging plug, sweet!
GP MAG Mat Oxley
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No visit to Motegi is complete without marveling at these beauties in the Honda museum. Asian SBK with
@alphaRacing
@matoxley
@GPMag_
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Lots of parts are shipped to Noriyuki Haga today.
Nori san has a long relationship with
@2DDatarecording
going back to his spectaular arriving on the WSB scene in the early 90's.
Now he 's managing his team NITRO racing, with both his sons riding R6s in Japan championship.
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@ValeYellow46
was inaugurated yesterday as honorary citizen of Assen.
To celebrate, his team has painted the closing link of his chain in the Dutch tricolor.
@Eurosport_NL
@sepangracing
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@CormacGP
@Kreso31
@SEJDarnell
@matoxley
what about the 'postman elastic' on VR's rearbrake? for me that is really the ultimate middle finger to high-tech, VR style.
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Seen in pitboxes at Sepang
@MotoGP
test: 2e
@Ohlinsracing
shock ready to go into the bike of Fabio Di Ginnantonio, but its not the usuall titanium spring, as (in grey) can be seen heer at Quartararo's bike.
@matoxley
@GPMag_
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20 Panigale V4's i counted here in this little shop in Kuala Lumpur, all customer bikes from local hobby racers, ready to get going on the nearby Sepang track.
@matoxley
@sepangcircuit
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9
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My new role as a (part-time) freelance
@MotoGP
tech writer brought me to the Portimao MotoGP test today. There are worse places to be in Europe, isn't it
@eugenelaverty
?
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8
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Seen at the Bol D'Or, this
@FIM_EWC
Ducati from
@ercendurance
DUCATI.
Mass centralisation and a less crash-vulnerable rear end are key at this bike.
@matoxley
@GPMag_
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Solid spacer between the inner / outer
@Ohlinsracing
fork legs on Bradl's Honda as seen at Jerez. Bikes offered for aero homologation or checking, must have the suspension fully extended.
@MotoGP
@matoxley
@GPMag_
oxleybommotogp podcast
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@GresiniRacing
's Moto 2 exhaust is a work of art, inspired at Suzuki's MotoGP bike?
Also notice the message at the endcone..
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Of course I can't do any of the things Marc Marquez does on the bike.
But when it comes to breaking bones with motorcycles, than breaking the plate just because you can't sit down, I'm up there with the best.
This was 2003, and of course the doctors were not impressed.
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There is more behind an airbox intake. Here we see how
@KTM_Racing
uses tubes for local additional cooling (ECU) and fill in low pressure regions.
@GPMag_
@matoxley
@motomatters
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Today was a very good day for Dutch motorbike racing: Zonta van den Goorbergh wins both races in the ETC class in Aragan, while Jeffrey Buis wins the WSSP300 race in MagnyCours.
We might not have a widespread support for motorbike racing here, but we do have some talents!
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Thats a a well-functioning 6 axle accelero / gyro unit in there.
This red-tailed hawk seemingly suspended in the air
Its head is perfectly still while its body stabilizes around it
[📹 Bill Bryant: ]
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During monday's test i watched here at the entry of turn 6 for a while.
Not joking, every time Miller or Binder came by, i could smell their rear tire.
Going to tweet this photo again and again because every time I look at Binder's rear tyre and then his front tyre it makes me smile and I'm sure you feel the same 📸 Rob Gray (Polarity Photo)
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8mm threads might seem overdone for a push/pull rod from a quickshifter on a
@MotoGP
bike.
But it was here in Jerez, in 2019, that Fabio's podium place went up in smoke because the 6mm version used at the time on the
@YamahaMotoGP
M1 just broke.
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Once upon a long ago, people in the small country of Holland where quite good at tuning small two stroke bikes. This Kreidler here belongs to 2 x world champion Jan de Vries.
At 76 yeard old, Jan still rides it regularly, and properly fast. Picture by
@motomatters
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When elektronics are not allowed to actuate the rear ride height device, but you so badly want it to sink automatically, this is what you end up with; a plumbers nightmare. Still bloody impressive.
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A
@YamahaMotoGP
charging unit. It maintain's the pressure in the reservoir of the pneumatic valve springs of their
@MotoGP
bikes in between rides.
Pneumatic valve springs are used at high revving engines, except for Ducati of course, who have their clever Desmodromic valve gear.
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Thats how the delicate balance of real hard braking in MotoGP looks like.
Note that his foot is still on the peg, ready to grab some rearbrake in case the Engine Brake is confused again at the moment he's about to turn in.
Tyres are Marc's favorite combi: Hard front & Soft rear.
Marc Marquez braking hard using all the suspension travel at the
#thaigp
@marcmarquez93
@HRC_MotoGP
@redbull
#mm93
#8ball
@UKNikon
#motogp
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Got these screws removed from my hip, yesterday. They where put in there last year when I broke my hip with a silly MTB crash. Thanks to the kind people at
@WZA_Ziekenhuis
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Anyone out here recognize the shape of the backrest from this new bench, resently placed here, close to my house?
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Had an interesting interview in Portimao for the 'Oxley Bom MotoGP'podcast with Ducati's video analyst and rider coach Manuel Poggiali. How you tell a double world champion that he has to change his lines?
Thanks to Ducati Lenovo.
#oxleybommotogp
.com
@MotoGP
@GPMag_
@matoxley
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Tried to record our Oxley Bom MotoGP podcast in the pit lane but it went wrong at
@pramacracing
: Good mate chief mechanic Nicola Manna dragged me into the festivities. Nice trophy!
@matoxley
@GPMag_
@MotoGP
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The
@ForwardRacingGP
Moto2 team has there own chassis. Unusual approach by bolting the chassis together.
Adjustable lateral flex?
@matoxley
@GPMag_
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