Ducati Sporting Club UK > DesmoDue Race Series > DesmoDue - General Questions and Chat > Maybe time for a change

[banger san]

[quote=mat2hew]when you accelerate you get weight transference to the rear which causes it to squat. I read somewhere years ago, that you also get 'anti-squat' caused by the torque of the engine pulling the chain against the rear sprocket which pulls the rear wheel forwards and pushes the swinging arm downwards, (have you ever noticed the rear of the bike lift up on the dyno)QUOTE]
So does the squat and anti-squat cancel each other out

[mat2hew]

Originally Posted by banger san

So does the squat and anti-squat cancel each other out

it shouldn't 'coz you want a curtain amount, there should be more squat than anti squat,

I recon that somebody who knows what they are talking about should answer that.

[antonye]

Keith Code (of CSS fame) says that the rear increases in height under acceleration due to torque acting on the pivot of the swingarm.

This makes sense, and he challenges those who don't believe him to put the front wheel against a wall and try accelerating to see which way it goes!

The reason behind him telling you this is to back-up his rule about weight transfer and positive throttle through a corner; by keeping a positive throttle through the corner you maintain your weight balance as well as improving ground clearance.

[mat2hew]

now,,,, in reverse to that,, when you pull the front brake the weight transfers to the front and the front goes down and the back goes up, which is pretty obvious but what happens when you use the rear brake? why? and how can we use that to our advantage?

[skidlids]

Originally Posted by mat2hew

but what happens when you use the rear brake? why? and how can we use that to our advantage?

Does that not depend on how your rear caliper is mounted
usually 4 options
Fixed mount above the swingarm
Fixed Mount below the swingarm
Floating mount above the swingarm
Floating mount below the swingarm

any of which will act as anti wheelie and ideal for rotating the front to land the back edge of a table top jump correctly

[bally71]

Originally Posted by skidlids

any of which will act as anti wheelie and ideal for rotating the front to land the back edge of a table top jump correctly

Lol .. bet it's a while since you've done that kev

[skidlids]

Originally Posted by bally71

Lol .. bet it's a while since you've done that kev

Never did get that one fully sorted and yes its been a few years since I've had a dirt bike, probably shows as they were great for winter training

[bally71]

Originally Posted by antonye

Keith Code (of CSS fame) says that the rear increases in height under acceleration due to torque acting on the pivot of the swingarm.

This makes sense, and he challenges those who don't believe him to put the front wheel against a wall and try accelerating to see which way it goes!

The reason behind him telling you this is to back-up his rule about weight transfer and positive throttle through a corner; by keeping a positive throttle through the corner you maintain your weight balance as well as improving ground clearance.

This is total tosh ..

If you put the front wheel against a wall the back end will rise because your shortening the wheelbase ..

Opening the throttle loads the back shock and it will sag ..

The rotational forces will try and pivot the bike around the rear spindle and the change in the centre of gravity plus the accelerational forces are transferred via the shock