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Rear Wheel Geometry


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11 replies to this topic

#1 OFFLINE   tr7driver

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Posted 12 June 2015 - 05:34 AM

Looking at my car from behind, it is obvious that the rear wheels are not exactly perpendicular to the road surface.  The distance between the top of the tires is slightly smaller than at the bottom, and kind of looks like this.  /-----\ 

 

I've noticed this on a couple of other C-maxes I've seen, so I'm thinking this is by design and not a mechanical issue with my car.  Anyone know the reason behind this?  Will this impact tire wear?  Should the tires be rotated crosswise to extend tire life?









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#2 OFFLINE   drdiesel1

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Posted 12 June 2015 - 06:14 AM

It's an independent suspension :happy feet:



#3 OFFLINE   rbort

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Posted 12 June 2015 - 06:45 AM

I have the same issue with mine.  The car looks like its squatting because of all the weight in the back.

 

I rotate my tires every 10k miles and I now switched to crossing them also.  The first 20k miles 2 rotations I just went front to back and back to front.

 

-=>Raja.



#4 OFFLINE   dr61

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Posted 12 June 2015 - 08:11 PM

You are looking at rear negative camber.  This is common for many FWD cars, although not always noticeable.  The usual purpose is to limit power-off oversteer (i.e. when cornering hard with power on and the driver lets off on the accelerator pedal abruptly).


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#5 OFFLINE   drdiesel1

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Posted 12 June 2015 - 09:25 PM

You are looking at rear negative camber.  This is common for many FWD cars, although not always noticeable.  The usual purpose is to limit power-off oversteer (i.e. when cornering hard with power on and the driver lets off on the accelerator pedal abruptly).

 

Most front wheel drive cars have a crossbeam for a rear axle. The C Max has a 4 wheel independent suspension.


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#6 OFFLINE   edweird

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Posted 13 June 2015 - 06:57 AM

You are looking at rear negative camber.  This is common for many FWD cars, although not always noticeable.  The usual purpose is to limit power-off oversteer (i.e. when cornering hard with power on and the driver lets off on the accelerator pedal abruptly).

I suspect that the C-Max is like my Focus SVT, and you'd have to also trail brake into a corner in order to plant the front tires and induce oversteer to rotate the car.  Considering the extra weight the C-Max has in the back this might be less gradual and predictable than other FWD cars which are comparatively lighter in the back.  I've got no plans to test this out.   :headspin:


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#7 OFFLINE   rbort

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Posted 13 June 2015 - 05:00 PM

When I had to slam on the brakes for a galloping freakin' Bear, yes a black bear, in Pennsylvania last summer, my Maxie pulled to the right which surprised me a little bit. I have not hit the brakes hard since then so I don't know if it happens all the time or not.

I think I read here someone else posted about pulling to the right during hard braking. They didn't post back what the outome or resolution of that if any.

-=^Raja.

#8 OFFLINE   drdiesel1

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Posted 13 June 2015 - 05:34 PM

When I had to slam on the brakes for a galloping freakin' Bear, yes a black bear, in Pennsylvania last summer, my Maxie pulled to the right which surprised me a little bit. I have not hit the brakes hard since then so I don't know if it happens all the time or not.

I think I read here someone else posted about pulling to the right during hard braking. They didn't post back what the outome or resolution of that if any.

-=^Raja.

Most likely due to the crown of the road.



#9 OFFLINE   P=E/t

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Posted 13 June 2015 - 06:16 PM

Succinct synopsis of camber, caster and toe-in here:

http://www.vikingspe...caster-and-toe/

 

While we're at it, speaking of tires--

 

Does anyone know the precise size of the lug nuts? This is surprisingly difficult to find out, including a quick go at the manual.

And it's complicated by the fact that, for instance, 17mm is just slightly less than 11/16 inch. Which is it, metric or English?



#10 OFFLINE   drdiesel1

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Posted 13 June 2015 - 07:27 PM

Succinct synopsis of camber, caster and toe-in here:

http://www.vikingspe...caster-and-toe/

 

While we're at it, speaking of tires--

 

Does anyone know the precise size of the lug nuts? This is surprisingly difficult to find out, including a quick go at the manual.

And it's complicated by the fact that, for instance, 17mm is just slightly less than 11/16 inch. Which is it, metric or English?

Metric.



#11 OFFLINE   timwil56

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Posted 14 June 2015 - 01:12 AM

If your asking about lug nut wrench size, they're metric, but my 3/4" deep socket fits nice with very little play and that's the equivalent to a 19mm socket.


Edited by timwil56, 14 June 2015 - 01:48 AM.


#12 OFFLINE   P=E/t

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Posted 14 June 2015 - 06:03 PM

If your asking about lug nut wrench size, they're metric, but my 3/4" deep socket fits nice with very little play and that's the equivalent to a 19mm socket.


Oh cool, thanks. Amazing, how that's so hard to find online! Even the owners manual is unclear, unless I missed something.








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