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  #13  
Old 05-10-2011, 11:45 PM
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Re: 2012 Jeep Grand Cherokee SRT8 features and availability

A spare would add a lot more weight.
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Old 05-10-2011, 11:51 PM
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Re: 2012 Jeep Grand Cherokee SRT8 features and availability

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Originally Posted by jgc4ever View Post
A spare would add a lot more weight.
I said "unsprung weight'..... big difference.
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Old 05-10-2011, 11:54 PM
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Re: 2012 Jeep Grand Cherokee SRT8 features and availability

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I said "unsprung weight'..... big difference.
Could you explain to me what that means? I really don't know.
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Old 05-11-2011, 12:07 AM
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Re: 2012 Jeep Grand Cherokee SRT8 features and availability

There is probably no spare because they probably don't have one that can fit over the calipers.
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  #17  
Old 05-11-2011, 12:08 AM
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Re: 2012 Jeep Grand Cherokee SRT8 features and availability

Sure thing.
Obviously a spare wheel and tire weighs xxxlbs, but UNSPRUNG weight is different.

Think of it this way, SPRUNG weight is everything the vehicle springs are holding up. So, the body, the engine, the interior, You etc etc....

UN-SPRUNG is everything Not sprung, ie, below the springs and above the road. Thing like wheels, tires, axles, brakes etc..... All those items are Un-sprung.
Now, obviously that weight has a lot of momentum when bouncing around all over the road. That why we need Shock Absorbers.
The heavier the un-sprung mass is, the more momentum it has, and therefore the heavier the shock absorber valving needs to be to control it all.
That's why high-end vehicles have super light weight Forged alloys that are lighter for their strength, its in an effort to reduce Unsprung weight, allowing a softer damping (shock absorber) valve setup for a better ride/handling compromise.

With items that offer rotational mass, such as wheel and tires, it of similar benefit that those items are lighter too. Becuase obviously, every time you accelerate or brake, that weight needs to be slowed or accelerated, using fuel or braking power.

every bit of weight has a flow-on effect, and for argument's sake, 40lbs of spare tire added as SPRUNG weight will have a LOT less effect than 40lbs of UNSPRUNG weight.

Sorry for the disjointed explanation, I'm in a bit of a hurry, supposed to be working
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  #18  
Old 05-11-2011, 12:47 AM
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Re: 2012 Jeep Grand Cherokee SRT8 features and availability

Quote:
Originally Posted by Marlin View Post
Sure thing.
Obviously a spare wheel and tire weighs xxxlbs, but UNSPRUNG weight is different.

Think of it this way, SPRUNG weight is everything the vehicle springs are holding up. So, the body, the engine, the interior, You etc etc....

UN-SPRUNG is everything Not sprung, ie, below the springs and above the road. Thing like wheels, tires, axles, brakes etc..... All those items are Un-sprung.
Now, obviously that weight has a lot of momentum when bouncing around all over the road. That why we need Shock Absorbers.
The heavier the un-sprung mass is, the more momentum it has, and therefore the heavier the shock absorber valving needs to be to control it all.
That's why high-end vehicles have super light weight Forged alloys that are lighter for their strength, its in an effort to reduce Unsprung weight, allowing a softer damping (shock absorber) valve setup for a better ride/handling compromise.

With items that offer rotational mass, such as wheel and tires, it of similar benefit that those items are lighter too. Becuase obviously, every time you accelerate or brake, that weight needs to be slowed or accelerated, using fuel or braking power.

every bit of weight has a flow-on effect, and for argument's sake, 40lbs of spare tire added as SPRUNG weight will have a LOT less effect than 40lbs of UNSPRUNG weight.

Sorry for the disjointed explanation, I'm in a bit of a hurry, supposed to be working
Interesting. Much appreciated.
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  #19  
Old 05-11-2011, 12:59 AM
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Re: 2012 Jeep Grand Cherokee SRT8 features and availability

the runflats that were on my Jeep saved me and my family some heartache one late rainy night......

I hit a spike on I75.....25 miles from home.....it got me home....
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  #20  
Old 05-11-2011, 01:21 AM
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Re: 2012 Jeep Grand Cherokee SRT8 features and availability

One has to wonder why the cops used road spikes on you mate?
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  #21  
Old 05-11-2011, 01:22 AM
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Re: 2012 Jeep Grand Cherokee SRT8 features and availability

LOL.....even they cant stop me...
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  #22  
Old 05-11-2011, 03:42 AM
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Re: 2012 Jeep Grand Cherokee SRT8 features and availability

I would think that they don't include a spare is because the wheels are too wide to fit in the stock location.
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Old 05-11-2011, 01:45 PM
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Re: 2012 Jeep Grand Cherokee SRT8 features and availability

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I would think that they don't include a spare is because the wheels are too wide to fit in the stock location.

I asked this question before but didn't get an answer. When you say no spare, you mean no spare full size AND no spare donut wheel??
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  #24  
Old 05-11-2011, 02:52 PM
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No spare at all

Sent from my PC36100 using Tapatalk
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