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Front Caster/wheel Geometry Questions


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#1 R32Egor

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Posted 23 February 2024 - 05:59 PM

HI all,

 

I set my geometry last year with a 4 wheel laser alignment system (mates garage) to the following specifications -

 

2mm Toe out (total)

-1.0° Camber both sides 

 

CASTER - 3.5° each side

 

I needed new wheels and choose Mambas with - 7 ET, obviously i knew that i will have to remove some body at the front of the wheel arch to prevent rubbing. 

The picture is of my new mambas trial fitted and does the wheel look to be in the right position for the correct camber above?

It is not in the middle of the wheel arch, it sits a bit forward of centre of the wheel arch.

 

TYazI6e.jpg

 

So my question is -

 

Does the wheel position look normal/correct for correct caster??

 

I just want to check before a cut away the front of the wheel arch for clearance.

 

Thanks



#2 nicklouse

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Posted 23 February 2024 - 06:02 PM

How it looks and what the geometry says are not related in any way.

 

eg the body may not be fitted correctly. Etc etc etc.

 

if that is the caster you want ( i would add more) then that is where the wheel will be. Trim accordingly.



#3 R32Egor

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Posted 23 February 2024 - 06:16 PM

what caster should i be looking for?

 

I think Keith Calver suggests 3.5° to 4° - what would you recommend?



#4 nicklouse

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Posted 23 February 2024 - 06:24 PM

For me the higher end of that 4 - 4.5

zgEVBrV.jpg



#5 R32Egor

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Posted 23 February 2024 - 06:32 PM

For me the higher end of that 4 - 4.5

zgEVBrV.jpg

 

 

WOW awesome information :D

If i am going for b road racer which setup should i be aiming for?

 

Real road or Tarmac comp? do you think



#6 bpirie1000

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Posted 23 February 2024 - 07:08 PM

Depends on your driving style..
Best get it about right then have a play see what you prefer.

#7 Midas Mk1

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Posted 23 February 2024 - 10:45 PM

More castor the further forward the wheel sits..

#8 absx2

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Posted 24 February 2024 - 09:37 AM

More castor the further forward the wheel sits..

 and the harder the steering gets so I would be leaving it where it is.

 

Kind of off topic and it`s a personal thing but I have found 1/2 a degree negative camber far better for road use than 1 degree as our crappy roads are not exactly track conditions.



#9 Ethel

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Posted 24 February 2024 - 11:50 AM

A bit less camber will likely get you a bit more castor.



#10 nicklouse

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Posted 24 February 2024 - 03:16 PM

A bit less camber will likely get you a bit more castor.

Ain’t it the other way round?



#11 Ethel

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Posted 24 February 2024 - 03:45 PM

Yes if you mean wheel clearance. I meant tuning the geometry to handle to your taste - I could have been clearer.



#12 68+86auto

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Posted 26 February 2024 - 01:24 PM

I assume you have made a mistake and your caster is 3.5 degrees positive, you listed negative. If you lower it to 3 degrees positive the wheel will be a bit further back.

Edited by 68+86auto, 26 February 2024 - 01:24 PM.





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