Archive of BMW Motorrad Club Cape (2006 - 2019)

No way!!!  (and its on a BM as well!)

Does remaining seated = cheating?

Either way, you can see he's been practicing !!!

Clearly an expert in action.  But before you beat yourself up:

• The roadbike has a smaller front wheel and a geometry that makes turning easier
• This is a gymkhana and is timed - it is not slow cones with static balance.  It does take impressive clutch, throttle and brake control though.
• Sitting makes it easier because the balance is achieved through counter-steering and throttle control, not through shifting the rider's weight.
• Notice how he sits upright and looks up, and leans the bike underneath him - proof that it is not about 'weighting the outside footpeg' but about 'leaning the bike underneath you'.

It does look like he has been riding in peak-hour traffic in downtown JHB though!

Because he is sitting he has raised the centre of gravity making it easier to throw the bike over from side to side.

Ag man I do that every morning on my Big Boy scooter taking my daughter to school.

Only difference is, my cones are moving in illogical directions.

p.s Charles, before you waste time typing out a long argument let me rather say it right up. I do agree totally with your post above. That is what makes a scooter easier than a GS in traffic.

This can only be done with practice and more practice.

By the way is there anyone in the club that can do this type of FUUUNNNNNN??

Maybe consider in the future of having a bring and braai with a lekker grass patch and see who really is the King/Queen of "man/lady of the machine"

Amazing what these guys do with those big bikes. I gues they train & practice for many many hours. I would like to see how they keep up on an offroad skills GS challenge.

On a technical note: Centre of Gravity as such is a negligible factor in this maneuvre. The major factor is inertia (= mass that is accellerated/decellerated, such as in tilting the bike side-to-side)

Quote "...Because he is sitting he has raised the centre of gravity..."

1. Sitting LOWERS the CofG (do the mathematical balance calculation, see for yourself)

2. Moving/tilting the bike underneat the rider has to do with inertia (mass) of the bike - notice that the rider in the video slides from side to side on the seat, effectively de-coupling his own mass (inertia) from that of the bike. Same effect as if standing! Obviously he is more comfortable doing this maneuver when sitting. Besides, the tar is smooth, he has no need to take up (soften) bumps from the road.

3. Remember

a) Standing lowers the forces acting on the bike (not the mass) from the seat (rider's bum on seat) to the footpegs (ie feet then transfers the full weight of the rider, instead of his bum)

b) Standing raises the rider's mass  to above the bike, effectively de-coupling his own mass (inertia) from the mass (inertia) of the bike. (at the same time raising the total CofG, although this fact is not a major role player in the dynamics involved)

Eisch, very technical, is dit nie! Maar dis soos dit is.

:)

Have you been sipping tea with Charles again???

I read all this, go look at Charles's threads again, take it in and find I suddenly cannot ride my bike.

Then a week later I have forgotten this, and suddenly I can ride again.

It's amazing (I did fail science matric, along with maths).

 well said

Warren & Charl !

Sipping tea with Charles? no, his centre of gravity is on the opposite side of False Bay - so I will need something stronger when I get there

I like the Japanese cops version with speed and compulsory stops and u-turns:

http://www.youtube.com/watch?v=bWaq0zOaAVU