Squeg
Posts: 5
Joined: Mon Jul 23, 2018 12:03 pm

Front tire wear

Mon Dec 30, 2019 2:43 pm

I have a 2015 Chevy Spark EV. I now have just over 20k miles on it. The front tires are getting close to the wear bars. The rears look great, having about 80% left. I bought the car used with 5k miles on it so I have driven most of the miles. I believe that these are the original tires (Bridgestone Ecopia). I am a very conservative driver.
My questions are these:
Is this wear pattern (so much more on the fronts) within expected range?
Is it safe to replace just the front tires?

MrDRMorgan
Posts: 1127
Joined: Wed Oct 30, 2013 7:27 am
Location: Manteca in Central California

Re: Front tire wear

Mon Dec 30, 2019 8:09 pm

Squeg wrote:
Mon Dec 30, 2019 2:43 pm
I have a 2015 Chevy Spark EV. I now have just over 20k miles on it. The front tires are getting close to the wear bars. The rears look great, having about 80% left. I bought the car used with 5k miles on it so I have driven most of the miles. I believe that these are the original tires (Bridgestone Ecopia). I am a very conservative driver.
My questions are these:
Is this wear pattern (so much more on the fronts) within expected range?
Is it safe to replace just the front tires?
Last question first - YES! It is safe to replace just the front tires.

First, I leased a 2015 Spark EV and turned it in at about 30k miles. I had to replace the worn out [ about 3/32" left] front tires before returning the car to the Chevy dealer. Second, I purchased a used 2014 Spark EV and noticed the front tires had significant tire wear even though the ODO only had 1500 miles on it. This car was a Hertz rental and was probably driven hard. I replaced just the front tires on this car too. Third, I purchased a used 2016 Spark EV with 6500 miles on the ODO. This car was driven hard too as the front tires showed significant tire wear. I replaced just the front tires at 19,220 miles. Today, at 27189 miles, the new front tires have worn about 2/32". The tread depth originally measured 10/32" when new. So, with 8,000 miles of driving, I have worn the tires 2/32" or about 4000 miles per 1/32". The tire wear bar is 2/32" high so I expect to have to replace my front tires about every 32,000 miles [8/32"]. The rear tires on both cars still have considerable tread left.

As a replacement tire, I installed Bridgestone Ecopia 422+ 185/55R15 82V front tires on all three cars and I have not experienced any reduction in mi/kWh attributable to the tires.

I, too, drive conservatively.

NORTON
Posts: 1297
Joined: Fri May 01, 2015 5:52 am
Location: KC,MO

Re: Front tire wear

Tue Dec 31, 2019 7:27 am

Squeg wrote:
Mon Dec 30, 2019 2:43 pm
...I am a very conservative driver.
My questions are these:
Is this wear pattern (so much more on the fronts) within expected range?
...
Keep in mind ALL the Go Power and up to 60 kW of the Stop Power is handled by those 185's up front.

The car has Blended Brakes which means when using the brake pedal like a normal person driving a normal car ,
most of the braking is Regen to the battery, right up until you see the Regen display max out, THEN the friction brakes blend in to help stop the car.

(Tesla does not have the advanced tech of Blended Brakes. You must adopt to the '1 Pedal' driving style to get regen with their cars.
Some like this style, some want to drive normal style. No taking your foot off the Go pedal and coasting with a T...
The Brake Pedal is just Friction Brakes on a Tesla. Kind of low tech. Try to find that in any of the swooning articles about Brand T. :roll:
You can set regen to Low, but then all brake pedal action is just making heat, old school style....)

I like that my only expense for 75 k miles has been tires and washer fluid !!! :)

And $78.50/yr road use tax in my state...I'm fine with that,, (only my <3000 lb EV wears the roads much less than a >5000 lb Brand T EV...)
I have to pay for electrons when I plug in at home during the cold months..
And I'm not 'a conservative driver', I enjoy this fast, silent, sleeper of an EV Hot Rod.!!!

OK, old joke,,, I tell people my Spark EV is actually a hybrid!
It burns Electrons and Rubber ! :lol:
Used '14 2LT w/ DCFC. +82K miles.
Mostly free charging! Only one LONG visit to the shop....
GM needs Modern Troubleshooting tools for Modern EV's.
3 step Trouble Tree, 1st try car died again, 2nd try not covered / cost $800. 3rd try fixed the problem.

ElDobro
Posts: 67
Joined: Sat Aug 31, 2019 1:05 pm
Location: NJ

Re: Front tire wear

Wed Jan 01, 2020 10:21 am

When I got my Spark from Carvana, it had Sailun Atrezzo SH406 tires on the front of my car and the stock Ecopia tires on the rear, which would tell me the fronts wearing out seems to be fairly common. I've always been easy on tires, so I'll see how they work out.

MrDRMorgan
Posts: 1127
Joined: Wed Oct 30, 2013 7:27 am
Location: Manteca in Central California

Re: Front tire wear

Wed Jan 01, 2020 12:15 pm

NORTON wrote:
Tue Dec 31, 2019 7:27 am
Squeg wrote:
Mon Dec 30, 2019 2:43 pm
...I am a very conservative driver.
My questions are these:
Is this wear pattern (so much more on the fronts) within expected range?
...
Keep in mind ALL the Go Power and up to 60 kW of the Stop Power is handled by those 185's up front.

The car has Blended Brakes which means when using the brake pedal like a normal person driving a normal car ,
most of the braking is Regen to the battery, right up until you see the Regen display max out, THEN the friction brakes blend in to help stop the car.

(Tesla does not have the advanced tech of Blended Brakes. You must adopt to the '1 Pedal' driving style to get regen with their cars.
Some like this style, some want to drive normal style. No taking your foot off the Go pedal and coasting with a T...
The Brake Pedal is just Friction Brakes on a Tesla. Kind of low tech. Try to find that in any of the swooning articles about Brand T. :roll:
You can set regen to Low, but then all brake pedal action is just making heat, old school style....)

I like that my only expense for 75 k miles has been tires and washer fluid !!! :)

And $78.50/yr road use tax in my state...I'm fine with that,, (only my <3000 lb EV wears the roads much less than a >5000 lb Brand T EV...)
I have to pay for electrons when I plug in at home during the cold months..
And I'm not 'a conservative driver', I enjoy this fast, silent, sleeper of an EV Hot Rod.!!!

OK, old joke,,, I tell people my Spark EV is actually a hybrid!
It burns Electrons and Rubber ! :lol:
Norton - I am curious. With 75k miles on your 2014 Spark EV, what is your current HV battery capacity? I currently have 22k miles on my 2014 Spark EV and my battery capacity is 15.4 kWh with my trend line showing a loss of 1 kWh every 4500 miles meaning I will never see 75k miles. What is your secret to battery longevity?

didget69
Posts: 37
Joined: Sat Sep 03, 2016 10:26 am
Location: Raleigh, NC

Re: Front tire wear

Thu Jan 16, 2020 8:40 am

We changed the front tires (factory Bridgestone Ecopias) on our 2015 Spark EV at ~ 19k miles in August 2019 with another set of same tires when we had alignment checked. Car now has 23k miles & still on good tread / condition rear factory installed tires.

Bought the car with 178 miles on it -

Bryan in North Carolina
2015 Spark EV 2LT

NORTON
Posts: 1297
Joined: Fri May 01, 2015 5:52 am
Location: KC,MO

Re: Front tire wear

Thu Jan 16, 2020 2:25 pm

MrDRMorgan wrote:
Wed Jan 01, 2020 12:15 pm
... I currently have 22k miles on my 2014 Spark EV and my battery capacity is 15.4 kWh with my trend line showing a loss of 1 kWh every 4500 miles meaning I will never see 75k miles. ..
I don't know how your car can be degrading at the rate....
Isn't there an owner on here that passed the 100k mile mark?

Maybe all this babysitting with the "charges to <80%" are not the way to go.
I answered this in some other thread. I don't do anything but plug in and walk away.
You know about the Cell Balancing that only takes place after 100% SOC, correct?
Used '14 2LT w/ DCFC. +82K miles.
Mostly free charging! Only one LONG visit to the shop....
GM needs Modern Troubleshooting tools for Modern EV's.
3 step Trouble Tree, 1st try car died again, 2nd try not covered / cost $800. 3rd try fixed the problem.

NORTON
Posts: 1297
Joined: Fri May 01, 2015 5:52 am
Location: KC,MO

Re: Front tire wear

Thu Jan 16, 2020 2:29 pm

didget69 wrote:
Thu Jan 16, 2020 8:40 am
We changed the front tires .... at ~ 19k miles .....still on good tread / condition rear factory installed tires.

Bryan in North Carolina
2015 Spark EV 2LT
Back on Topic !!

Bryan,
You sir, know how to enjoy this car !! :lol:
Tires are cheap.
Electrons are cheap.
Why tip toe you way through the streets? :P
Used '14 2LT w/ DCFC. +82K miles.
Mostly free charging! Only one LONG visit to the shop....
GM needs Modern Troubleshooting tools for Modern EV's.
3 step Trouble Tree, 1st try car died again, 2nd try not covered / cost $800. 3rd try fixed the problem.

MrDRMorgan
Posts: 1127
Joined: Wed Oct 30, 2013 7:27 am
Location: Manteca in Central California

Re: Front tire wear

Thu Jan 16, 2020 2:43 pm

NORTON wrote:
Thu Jan 16, 2020 2:25 pm
MrDRMorgan wrote:
Wed Jan 01, 2020 12:15 pm
... I currently have 22k miles on my 2014 Spark EV and my battery capacity is 15.4 kWh with my trend line showing a loss of 1 kWh every 4500 miles meaning I will never see 75k miles. ..
I don't know how your car can be degrading at the rate....
Isn't there an owner on here that passed the 100k mile mark?

Maybe all this babysitting with the "charges to <80%" are not the way to go.
I answered this in some other thread. I don't do anything but plug in and walk away.
You know about the Cell Balancing that only takes place after 100% SOC, correct?
I have not yet been able to figure out why the batteries in my 2014, 2015 and 2016 Spark EVs all dropped to about 15 kWh at around 30k miles. My friend's leased 2016 Spark EV dropped to 14.8 kWh too before he turned it in. Yes, I know about cell balancing and I do charge to 100% some of the time but that does not seem to help. I wonder if driving in L all of the time could be a cause??

NORTON
Posts: 1297
Joined: Fri May 01, 2015 5:52 am
Location: KC,MO

Re: Front tire wear

Thu Jan 16, 2020 4:50 pm

MrDRMorgan wrote:
Thu Jan 16, 2020 2:43 pm
.... I wonder if driving in L all of the time could be a cause??
Slowing down at ~30 kW of Regen displayed in L is no different than slowing down with your foot on the brake and displaying ~30 kW of Regen.
These cars have Blended Brakes! Tesla's do not....

I wouldn't give that a second thought.

Geez, but seeing your car's death spiral in the numbers must be a bummer. :(
You must be doing something wrong.... :lol: JK.....

I routinely flog my car.
Do you tip-toe in the car everywhere you go? Are you one of these guys that always get better than 5 mi / kWh?

Batteries are electrochemical devices.
Could it be they enjoy stretching their legs and working hard once in a while? :?:
Used '14 2LT w/ DCFC. +82K miles.
Mostly free charging! Only one LONG visit to the shop....
GM needs Modern Troubleshooting tools for Modern EV's.
3 step Trouble Tree, 1st try car died again, 2nd try not covered / cost $800. 3rd try fixed the problem.

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