Phew, sorry... me again 
I have the second edition of uncle rons book, but I have read about the wishbone dimensions being out. Was this updated for the second edition? or
are these still out.
Please see pics...
I have read on other posts that in the 1st edition of the book, the wrong offset was put on the top wishbone caster. Could anybody pls confirm if
this is a updated/correct drawing that I have. Ta
Oh... and IIRC I want to be making them from 14 or 16swg?
Thanks
It's the top wishbone that's out.
And yes, it's still out in the 2nd edition.
Just make the castor offset 22mm and not the 11mm that's pictured above.
Unless you're using Sierra uprights for which it should (allegedly 
) be 25mm.
HTH,
James
[Edited on 18/4/06 by James]
As james says.
The upper wishbone should have an offset (toward the rear of the car) of 22mm, not the 11mm shown on the diagram.
Basically make the larger dimension 132mm and the smaller one 90mm and you wont be far off.
David
Just be careful guys those scans are in breach of a current copyright...
Hi,
Yup, this is what I've used.
Paul G
Rescued attachment w-bones-dims-s.jpg
Hi all, sorry to highjack the thread, can someone confirm that when using Sierra uprights that the offset should be 25mm, because if this is so then
it's a new set of top bones I need to make. atb Chippy 
quote:
Originally posted by Chippy
Hi all, sorry to highjack the thread, can someone confirm that when using Sierra uprights that the offset should be 25mm, because if this is so then it's a new set of top bones I need to make. atb Chippy
quote:
Originally posted by Chippy
Hi all, sorry to highjack the thread, can someone confirm that when using Sierra uprights that the offset should be 25mm, because if this is so then it's a new set of top bones I need to make. atb Chippy
quote:
... exact caster (or to use the term bikers use "trail" ) isn't that critical but it must be the same both sides.
[Edited on 19/4/06 by britishtrident]
I make 121-102=19mm. The two measurements converted to metric don't add up to the 222mm for the overall width so use one or the other.
Offset is taken from the centreline of the wishbone. The centre of the wishbone is at 111mm (222/2).
121-111 = 10mm. So the offset actually shown in that diagram is 10mm not 11. (oops )
David
[Edited on 19/4/06 by flak monkey]
Ah, thanks. That was where I was getting confused. So 22mm it is.
Nice one chaps ta
Mine's been done 5 years and works o.k. so I'll not worry about it now .
quote:
Originally posted by Peteff
I make 121-102=19mm. The two measurements converted to metric don't add up to the 222mm for the overall width so use one or the other.
snip
ERRR......Castor and trail are two very different things.
Caster is the angle of the kingpin axis to the longitudinal vertical.(ie Viewed from the side.)
Trail is what you see on supermarket trolleys, and is the rearward setback of the axle itself from the kingpin axis. (ie. The axle c/l is not
concurrent with the kingpin c/l, but is set back from it.)
Both have very different effects. I would choose more caster every time, before I entertained 'trail'.
Cheers,
Syd.
British Trident,
Is it not 'Rake' your thinking of? As you can have Rake AND Trail on a bike.
If i remember correctly (Not wishing to start an argument)
Castor - The rotation of a single axis
Camber - Toe in or Out
Rake - The angle of an axis from another
Trail - The distance of and axis from another
I could be wrong though.
Not many things keep me awake, but this did! Ive checked this, and i am correct. My explanation isnt very clear though...
Castor - Rotation of a single axis from vertical
Camber - Toe in or out
Rake - The longitudinal angle of an axis from vertical
Trail - the 'offset' of one axis from another (ie not in line). Measured in distance, not degrees.