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Discussion Starter #1
Hey guys, help a newbie out. :smile: I was wondering if this combo can work as a spare tire? Obviously will be driving carefully when the spare is on, and at low speed only(55mph).

Car is a 2019 Scat pack with 20x9 rims, and 245/45/R20 tires.

Rims:
https://www.amazon.com/dp/B01MCY7OQ...olid=2KXW3MABPYSOS&psc=1&ref_=lv_ov_lig_dp_it

Tires:
https://tiresize.com/tiresizes/235-55R18.htm


On a related note, is the mobility kit enough to get you home reliably? Is it problematic to use like gunking up the TPMS? My intention was to leave the spare tire with a friend and just rely on the mobility kit, only calling the friend if its a really bad gash.

Thanks in advance! :wiggle:
 

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Yngvar,

I did a lot of research on spare tire options before I bought my ‘18 SP (6.4/A8/Dynamics). Per my research, steel wheels are not an option.

Discount Tire does offer a reasonably priced cast wheel and tires in the OEM size that would make a good spare.

NOTE: I have no affiliation with Discount Tire. I’m just a very satisfied customer. See: https://www.challengertalk.com/foru...n-kyle-crist-discount-tire-dubuque-ia-671831/

wheel:


tires:
 

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There are a couple of mini spare kits already discussed here if you are interested in that option. I have a wide body and carrying a 20x 11" full size spare is not an option for me. One kit is Modern spare and the kit comes with a jack and tools to install the spare.
 

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Discussion Starter #4
Is this the one?

https://www.amazon.com/2008-2018-Do...spare+tire&qid=1560780948&s=automotive&sr=1-1

Pardon if I'm looking only at Amazon as its the most convenient for me as I live in Asia.

As for the link, I considered it but I was worried the wheel was smaller, 26in vs 28in stock. As mentioned, I'm a complete noobie and don't really know the leeway's of tire sizing.

On another note, I have the Harman Kardon system installed, (We really don't have a say on what model/packages we get in our country), would be nice to get ideas on how to store the spare in the trunk in case I decide to bring it with me.

Thanks sirs..
 

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You may want to look into getting a Safety Seal plug kit and a decent compressor.
Unlike most, the Safety Seal plugs really work, and the kit is small and light.
 
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Kit

subscribing to this thread. That is a good looking kit Yngvar, that you found on amazon. Seems like Dodge (FCA) should have those at the dealer so you could purchase there with the car. They would probably sell a bunch, roll it in the car loan with the extended warranty.
Its says its 25.6 inches in diameter, I'll have to measure next time i'm back over at the storage facility.
I didn't know amazon had these.
thanks !
 

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Is this the one?

https://www.amazon.com/2008-2018-Do...spare+tire&qid=1560780948&s=automotive&sr=1-1

Pardon if I'm looking only at Amazon as its the most convenient for me as I live in Asia.

As for the link, I considered it but I was worried the wheel was smaller, 26in vs 28in stock. As mentioned, I'm a complete noobie and don't really know the leeway's of tire sizing.

On another note, I have the Harman Kardon system installed, (We really don't have a say on what model/packages we get in our country), would be nice to get ideas on how to store the spare in the trunk in case I decide to bring it with me.

Thanks sirs..

Based on my info a 2 inch difference in a tire wheel combo would be questionable to use on the front axle (assuming no AWD system) and would definitely not be at all appropriate for use on the rear axle.

Even on the front axle the car might have a serious pulling problem, the ABS or stability control system might turn on a warning light.

(In at least one case I know an auto maker says to when replacing just one tire on an axle -- due a flat for instance -- to replace the other tire if the difference is tread depth is 30% or more.)

Really if you want a suitable spare tire my recommendation would be buy a 5th wheel identical to the 4 mounted on the car and then mount an tire identical to the ones already on the car to this wheel and put it in the trunk. I would not consider this anything but a spare tire suitable only for use just long enough to get you to a place you can get a suitable replacement for the flat tire. I would not include this spare tire in the tire rotation business either.

If a full sized wheel/tire won't fit in the trunk or if you don't want to sacrifice trunk space to this I'm not sure a space saver "spare" tire is available that would have a wheel/tire size that is compatible with other 3 wheels/tires on the car.

If there is no suitable space saver spare tire available then a portable air compressor /flat tire repair kit is probably your best choice.

Given your location even if you can't carry it with you in the car it might be a good idea to have on hand at least an identical wheel and new tire already mounted and ready to use so in the event your car gets a flat tire you won't have the car laid up while you wait for a new tire to arrive at your location.
 

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Discussion Starter #8 (Edited)
My thoughts exactly. I've always read that a different tire size would screw up the traction controls or something to that effect.

Im looking for a spare coz I asked the dealership for an exact rim/tire combo I have and they quoted me 2,200 usd for a single rim/tire. I was hoping to to find a suitable replacement coz I just felt it was too expensive..
 

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Modern Spare says the size difference is no concern.


My vehicle has a limited slip differential, will using the spare damage my car?

-No, it will not. There are many performance vehicles that come from the factory with both a limited slip differential (LSD) and a spare tire. As a general rule of thumb, a spare tire needs to have a diameter that is at least 85% of the diameter of the vehicles other tires.

At minimum, our products have a spare tire diameter that is 92% of the OEM tire diameter with many of our kits having a 95% + diameter relation to the OEM tire size.

Thus, you can be confident that any Modern Spare product will be well within the safe use range for your vehicle.



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Really if you want a suitable spare tire my recommendation would be buy a 5th wheel identical to the 4 mounted on the car and then mount an tire identical to the ones already on the car to this wheel and put it in the trunk. I would not consider this anything but a spare tire suitable only for use just long enough to get you to a place you can get a suitable replacement for the flat tire. I would not include this spare tire in the tire rotation business either.
Rockster,

If a spare is only going to be used to get to where the flat tire can be repaired or replaced, why are an exact-replacement wheel and tire needed? A “cast” spare wheel (e.g., Replica brand) is much less expensive than an OEM forged wheel. There are OEM-size tires that are much less expensive than the OEM tires.
 

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If I'm going thru the expense and hassle of a full size spare it's going to match the other wheels and tires and I will just do a five tire rotation.

Other issue is finding a good way to secure it. You just cant leave it laying on top the trunk.


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https://www.challengertalk.com/forums/f79/spare-tire-kit-671037/index3.html
There is a lot of info here about the modern spare kit. I have one and my goal for a spare is to get the car out of a high traffic area so the regular tire can be replaced while my car sits in the comfort of my garage and not sitting on the side of the road. I have other vehicles to drive while I order a full size replacement if needed. Even getting a tow truck to take the car home would be an issue since they don't bring a spare with them to get the car on the back of the tow truck. The factory rims are too expensive to drive on with a flat and anything that causes a flat tire while driving down the road will probably not be able to be fixed with some gunk. Hitting road debris normally rips a hole in the tire. Issues such as VSS signal issues, poor handling and differential wear are just not an issue if you don't go on a long road trip while the spare is installed. I doubt I will be hitting the road course while running a spare either. Cars have been running mini spares for a very long time and it's just not an issue unless you daily drive it that way on the freeway, which can look pretty scary on some cars.
 

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Modern Spare says the size difference is no concern.


My vehicle has a limited slip differential, will using the spare damage my car?

-No, it will not. There are many performance vehicles that come from the factory with both a limited slip differential (LSD) and a spare tire. As a general rule of thumb, a spare tire needs to have a diameter that is at least 85% of the diameter of the vehicles other tires.

At minimum, our products have a spare tire diameter that is 92% of the OEM tire diameter with many of our kits having a 95% + diameter relation to the OEM tire size.

Thus, you can be confident that any Modern Spare product will be well within the safe use range for your vehicle.



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Well, some automakers disagree and I would go with what they have to say. In the case of my Porsches the guidelines called for if a rear tire got a flat to remove the rear wheel/tire, remove the front wheel/tire, mount the front wheel/tire on the rear axle, and mount the space saver wheel/tire on the front.

AFAIK Dodge does not provide any spare tire/wheel kit so one can't know what diameter it deems suitable.

Take that back, sort of. Checked the digital copy of my Hellcat owners manual. Two sizes of spare tire are listed: T145 80 18; 165 80 17.

For the 145/80x18:
Dia: 27.1"
Circ: 85.2"
Revs/mile: 744


For the 165/80x17:
Dia: 27.4"
Circ: 81"
Revs/mile: 737


For my Hellcat and its 275/40x20 tires:
Dia: 28.7"
Circ: 90"
Revs/mile: 704


Now I'm not sure which if either of the two space saver tires listed above would even fit on my Hellcat, clear the brakes, etc. It could be with the tires (and brakes) the Hellcat comes there is not suitable space saver spare tire, so it is either a tire patch kit and a portable air compressor and premium auto club membership or a DIY full size spare.

Even if one of the above would fit that one is not included with the car suggests the size difference is not acceptable.

Let me add that I don't consider the fact two space saver tires were listed in the manual as being sufficient grounds to believe either one even if it bolted up to the car's hub would be acceptable to use. The presence of the info on the space saver spare tires suggests laziness on the part of Dodge to update/keep current the owners manual. (Dodge is not the only automaker I have found to be guilty of this.)

Unless Dodge publishes some info that covers specifically which space saver wheel/tire combo works with its cars, like the Hellcat, for me it is either run with no spare and rely upon luck, and a tire patch kit and an portable air compressor -- which I believe I spotted in the trunk of the car -- or buy and carry a full size spare wheel/tire setup.


Might add even if one found a suitable space saver wheel/tire to carry there has to be room in the car for the full sized wheel/tire unless one is comfortable leaving it on the side of the road until he can make arrangements to come back and pick it up with another vehicle.
 

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The thread below covers a T/A with a factory limited slip diff, Brembos and a spare tire. Not sure what the loaded radius of the spare is but the road tires are closer to 28".

All the Brembo cars are the same in the rear so this spare would fit at least in the rear. Doesn't sound right that they would only offer a rear spare but cant imagine this fitting over the 6-piston in the front.

https://www.challengertalk.com/forums/showthread.php?p=8476857

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My widebody has the same brembo brakes as a Hellcat so the spacer I got with my kit works just fine to mount the spare on the front. If you go to the other thread referenced above you will find the size difference between my stock tire and the mini spare.
 

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Of course, I participate in a spare tire thread and guess what? Flat tire today on the way to the office.

Ok I have to admit I really appreciate that TPMS. I didn't have it actively displaying -- I usually drive with the oil temperature displaying in the center of the dash. (Performance Gauges is too flaky to rely upon. (Sigh)) But I got a warning at 25psi while sitting at a stop light. Thought I might be able to drive to a nearby tire store but the pressure dropped a few PSI just while the light was red. Turned left and then right into a parking lot to get off the busy road.

Dug out the tire repair kit. First time I have ever used one. Thank goodness the owners manual was in the car and I could consult it. Got the tire positioned -- just so happened the leak happened to be very close to the tire stem so both the tire stem and leak were down about as low as they could be.

Got the goop hose connected to the tire stem valve and plugged the power cord in and started the engine, switched the selector the tire sealant position, pushed the power button and let the pump rip.

Goop flowed through the hose -- picked the gizmo and helped the last of the goop flow from the canister through the hose into the tire valve stem. Air pump running all the time and yet the tire pressure gauge didn't budge for what seemed like hours but the instructions said it may take 15 minutes of pump run time. Some goop leaked out the hole in the tire but not much. Then the gauge pressure started coming up. I stopped the pump when the gauge read around 40psi. Wanted some margin in case there was still a leak.

Disconnected the kit and gathered up the stuff and tossed it into the trunk. Fingers got a bit messy when I unscrewed the hose from the tire stem valve.

Found the nearest Dodge dealer: San Leandro Dodge. Called and found out it has 4 tires of the right size/type for my Hellcat. Drove there: 4.1 miles. TPMS was actively displaying during the drive and the tire lost no pressure on the way to the dealer. That goop works I guess.

Anyhow, booked the car in to the service department and now I'm waiting for the car to receive 2 new rear tires.
 

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Anyhow, booked the car in to the service department and now I'm waiting for the car to receive 2 new rear tires.
Rockster,

Sorry to hear that you had a flat, too.

My flat last week held air well enough that I didn’t have to use the goop to get to Discount Tire 15 miles away in Dubuque, IA. The people at Discount Tire thanked me for not using the goop.

Be interested to hear how the dealer handles the goop in your tire.
 

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That goop works I guess.
Good to hear it got you to the store, Rockster.

The people at Discount Tire thanked me for not using the goop.

Be interested to hear how the dealer handles the goop in your tire.
I bet they were happy not to have to deal with the aftermath of using goop. At least in Rockster's case they didn't have to try cleaning out the tire, too.

It's bad enough to get it on the tire machine.
 

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Rockster,

Sorry to hear that you had a flat, too.

My flat last week held air well enough that I didn’t have to use the goop to get to Discount Tire 15 miles away in Dubuque, IA. The people at Discount Tire thanked me for not using the goop.

Be interested to hear how the dealer handles the goop in your tire.
I have heard the goop can be a problem cleaning it off the wheel, but I had no choice, really. Had I called the auto club the guy who showed up would have probably just used the service kit to get me going rather than flat bedding the car to a tire store/dealer.

Just checked. Car on the lift with rear wheels off. I was told "3pm" but I had hoped it would be sooner than that. But apparently 3pm it will be be. Or a bit after...

I'm starving. Usually eat breakfast at work then lunch and I have had neither. Just finished a cup of coffee and it was all I could do to not eat the paper cup.
 

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Again, as an alternative, I can highly recommend Safety Seal plugs.
Apparently the OE compressor works, but I'm not sure I'd have the patience to wait for it.
 
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