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avendlerdp said:
I just put these on my '14 but only on the front. 195/50R-15 HANKOOK VENTUS R-S3 (VERSION 2) XL ...
I've been wondering about doing something like this for summer months.
How bad can the handling be?
This car has an advanced 'Stability Control' system that might keep the rear end behaving properly,,,, or at least keep the car from entering a ditch backwards !!!

I wonder what Bryce thinks about running very different tires front to back?

And what exactly happens to these tires when the temps get cold?


Thanks for any info !!
 
NORTON said:
avendlerdp said:
I just put these on my '14 but only on the front. 195/50R-15 HANKOOK VENTUS R-S3 (VERSION 2) XL ...
I've been wondering about doing something like this for summer months.
How bad can the handling be?
This car has an advanced 'Stability Control' system that might keep the rear end behaving properly,,,, or at least keep the car from entering a ditch backwards !!!

I wonder what Bryce thinks about running very different tires front to back?
Here's an opinion from Bryce: http://www.mychevysparkev.com/forum/viewtopic.php?p=12408#p12408. I don't share the same opinion because at the extreme limit the stability control can do nothing to keep you on the road. I do agree that during normal or spirited driving, the stability control should keep everything going straight, even with mismatched tires.
 
abhisharma said:
Hello,

I drive a lot, almost like 40 miles a day.

As I read that I have to get/pay for new tires upon lease return. So, I am thinking to replace my tires and will put back stock tire during lease turn-in.

I don't feel very confident with these tires. It takes a while to stop and poor grip.
Can anyone please suggest which tires should I go with ?

Def better than stock and give more confident.

Thanks,
Abhi


I'm still very happy with my BFG's and can recommend them.
 
The BF Goodrich g-Force Super Sport A/S tires don't appear to be available any longer in the either the OEM front or rear size.
 
Zoomit said:
...Here's an opinion from Bryce: [excerpt]: Fiddling with tire sizes will NOT result in the car having oversteer issues (spinning around), the factory stability control just plain won't allow it. Trust me, I WANT oversteer (for autocrossing) and just plain can't get it!!!.
I don't share the same opinion because at the extreme limit the stability control can do nothing to keep you on the road. I do agree that during normal or spirited driving, the stability control should keep everything going straight, even with mismatched tires.

I don't know if radically different rubber compounds would be the same as 'fiddling with' 195 vs 185, or what ever.
I suppose 'differences are just difference' and the stab control just handles it.

EDIT: I have two sets of tires to use up. I saved the OEM tires for later. I need to cool my jets and just use these tires up as quick as I can !!
 
I have been running Federal 595 RSR tires on the stock rims- 195/50/15 front 205/50/15 rear. Rock solid, and not squirmy on the highway. cruising at 80 is effortless now as with the eco tires, the rear end felt really loose. Drives like its on rails- can take turning freeway on-ramps at 60 mph at still no squealing or skidding at all. Way better traction off the line and braking. Zero clearance issues as I'm 1.5" front and 2" rear dropped. I imagine they wont last very long as they are really sticky. Range is really not effected much, maybe 3 miles per 35 miles or so but just way more fun!
 
Wheels are from a Kia Rio
17"x6.5", ET 43mm
Michelin Pilot Sport A/S 3 205/40R17
(Tried 205/45R17, but they rubbed the strut spring perch up front).
Had to have the center hubs bored out 2.4mm (54.1mm (Kia) to 56.5mm (Chevrolet))...so now they're hub-centric :ugeek:

Pic taken just after install of wheels/tires. Thanks to the crew from Gran Turismo East in Atlanta for the fabulous work; Kieran, Chris et al are true professionals.
2016-07-12%2010.47.26_zpskqsdeagq.jpg


Test fitting wheel after hub boring:
2016-05-08%2016.42.22%20HDR-2_zpsy3ln2syy.jpg


Just prior to my leaving the shop, this gorgeous thing rolls up...
2016-07-12%2010.58.05_zpsw7064ta2.jpg
 
Fantastic !
Who knew you could have the hub centers bored to a large size ! Was that expensive? What type of shop does this work?
I see this wheel for sale on ebay. They list it as a 43mm offset, but either way, if it works for you, fantastic.

You should try to get the suspension at full 'bump' and try some runs with the front wheels turned. Half-Pipe like dips in roads are a gentle way, if you can find any.
Just to make sure you don't have any rubbing at suspension up limits.

Thanks for posting this pioneering upgrade !!! You may be the first guy using 205/40R-17" tires !
Your technique opens up possibilities for 16" wheels too! (I'd rather not run 40 series tires...)
 
NORTON said:
Fantastic !
Who knew you could have the hub centers bored to a large size ! Was that expensive? What type of shop does this work?
I see this wheel for sale on ebay. They list it as a 43mm offset, but either way, if it works for you, fantastic.

You should try to get the suspension at full 'bump' and try some runs with the front wheels turned. Half-Pipe like dips in roads are a gentle way, if you can find any.
Just to make sure you don't have any rubbing at suspension up limits.

Thanks for posting this pioneering upgrade !!! You may be the first guy using 205/40R-17" tires !
Your technique opens up possibilities for 16" wheels too! (I'd rather not run 40 series tires...)

I stand corrected. ET 43mm. As for the hubs, Wheel Wizard in Atlanta did the job; any good machine shop should be able to do this.

Immediately after the new shoes were mounted, I had to take the car to Chevy for warranty work (ECU update, I think, and to have them re-flash the MyLink firmware), so I only got about 2 miles of driving (on really shitty roads) on the new shoes. I should have the car back tomorrow. Then, it will get a full workout.

There are perhaps a couple gas Spark drivers running 205/40R17; and there's at least one running 205/45R17. That's where I got the idea (http://chevysparkforum.com/topic/1210-aftermarket-wheel-tire-pics-and-specs/?page=1). They say "no rubbing" or "a very slight rubbing". My car has very slight rubbing at full lock.

I can say that the car seemed waaaaaay quieter, but I hesitate to offer that observation as legitimate until I have more seat time.

After the tires were mounted and we moved the car into the parking lot, we stood there looking at it. I had initially been thinking that I'd like to lower the car after the new shoes were mounted, but Chris (from GTE) commented that "it doesn't even need to be lowered"...and I agreed.

I think I'm going to like this change... :D
 
EldRitch said:
Looks Boss!
I settled for 195/205x50 Dunlop Direzze DZ102 on stock wheels for mine.

One of my i3-driving buds recommended those tires, (he's also a BMW enthusiast and instructor at Road Atlanta) but the tire shop guys gave me the stink eye when I mentioned them. They said they would kill the range.
 
sTeeve said:
.. They said they would kill the range.
Are you ever operating at the limits of your "range".
Then who cares?
Tire shops are not EV specialists. Maybe they wanted you to buy a more 'profitable' tire?

edit:
Wait a minute... "slight rubbing at full lock" ???
So is your plan to never go full lock?

I don't like the fit now.
What about those other 17" wheels that people are using? Are they getting by without rubbing?
Maybe if it was actually a 45 mm offset instead of 43mm. Would be enough to not rub?
2 mm spacers? 3 mm? There is a limit on those things.
My wish list continues....
 
NORTON said:
sTeeve said:
.. They said they would kill the range.
Are you ever operating at the limits of your "range".
Then who cares?
Tire shops are not EV specialists. Maybe they wanted you to buy a more 'profitable' tire?

edit:
Wait a minute... "slight rubbing at full lock" ???
So is your plan to never go full lock?

I don't like the fit now.
What about those other 17" wheels? Are they getting by without rubbing?
Maybe if it was actually 45 mm offset that would be enough to not rub?
2 mm spacers? 3 mm? There is a limit on those things.

Yes, I do operate at times at the extremes of this car's range. The way I see it: "so what?" Here in Ga., the continued expansion of the DCFC network negates any range anxiety I might have had...which I never had, anyway. I'm not all that enamored with the 3.3 kW L2 charge rate, but there may be a solution to that, as well.

As for the rubbing: the car was up on the lift when we checked it. My limited time with it post-install didn't allow me to test it; however, the rubbing was on a plastic part at full left lock, and almost not noticeable. Slight trimming may be all that's necessary. We thought about spacers, but the tires clear the suspension components, so in our opinion they aren't necessary.

I'll have the car back in a few hours, then I'll know. Can't wait!
 
sTeeve said:
.... the rubbing was on a plastic part at full left lock, and almost not noticeable. ..... Can't wait!

I can't wait either !
Plastic is no big deal. You should be able to check every week or so to see if it progressing into a hole in the plastic or wearing on the tire.
Hopefully it's not on the thin sidewalls.

Let us know how it wears in. Maybe some pics of the contact points... Thanks!
 
No rubbing that I can detect.

The rubbing may have been because the car was up on the lift when we checked it, and with the weight of the car off the suspension. Once on the ground, no rubbing. Weird.

I've taken a big hit in range. Lost 15 - 20 mi, not unexpected. However, since the wheel/tire swap, it's been sweltering hot, here, and I've been using the hell out of the AC, which sucks huge amounts of range.

The last few days there's been chances to drive without using the AC, and my mi/kWh avg has picked up.

I saw as low as 1.9mi/kWh :eek:

4.2mi/kWh yesterday evening when ambient temps dropped to 75º F, but the temp has shot right back into the above 90º F range again.

I'm running 46 psi (max is 50). The car is totally different, now. Feels like a bigger car, like the wheelbase has been stretched. Ride is smooth and much more stable. Off the line it feels more sluggish but I have to remind myself that I just added 5 lbs/corner; that's a lot of unsprung weight/rolling resistance/larger diameter!

Since I still have the factory wheels (the rear tires are hardly worn; the fronts are done), I can swap when I do a long road trip...maybe...if I replace the front Ecopias. The TPMS learning routine doesn't look that difficult (I put in new TPMS sensors with the new shoes).

Overall, I'm quite happy with this setup. I wish that there were LRR tires in the size that these wheels require; perhaps I would get better range. But, I can live with this. Over the weekend, the pièce de résistance arrived in the mail: center caps! I had to merge two center cap kits to get parts that fit...that is to say, I removed the KIA emblem from one set and applied Chevy emblems. Et Voilà!

Before:
2016-07-23%2015.15.11_zpshh8wn3hi.jpg


Not before:
2016-07-23%2015.15.26_zpsvjfdeqdf.jpg


-Bob K.
 
Well, well, well. On my way home tonight I saw 5.1 mi/kWh. Ambient temps 80° F. AC off, windows/sunroof open. Huh. This little car continues to impress!

-Bob K.
 
Dang it Bob,
I wish you hadn't posted such great pictures of those beautiful performance wheels and tires and all the info needed to make them work...

Now I'm looking into spending money to copy your setup !

Maybe I'll put winter tires on the stock wheels someday.


Quick question: Do you need a TPMS relearn tool or does the car have a built in procedure to do a relearn? (I guess I should RTFM..)\

EDIT: question 2: You said you had slight rubbing on the front strut spring seat when you had 45 series tires installed. Would 2-5mm spacers fix that???? I dread having 40 series tires in the real world. Not that 45's are that much hardier...
 
NORTON said:
Dang it Bob,
I wish you hadn't posted such great pictures of those beautiful performance wheels and tires and all the info needed to make them work...

Now I'm looking into spending money to copy your setup !

Maybe I'll put winter tires on the stock wheels someday.


Quick question: Do you need a TPMS relearn tool or does the car have a built in procedure to do a relearn? (I guess I should RTFM..)\

EDIT: question 2: You said you had slight rubbing on the front strut spring seat when you had 45 series tires installed. Would 2-5mm spacers fix that???? I dread having 40 series tires in the real world. Not that 45's are that much hardier...

Yes to the TPMS relearn (I did my homework on that, too). The Spark EV uses 315 MHz frequency TPMS sensors (ACDelco 13581558) https://www.amazon.com/gp/product/B00O9H0QIG/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1.

You can get them from your local Chevy dealer for about two to three times the price of Amazon. The tire shop programmed them for me as part of the tire mounting.

The slight rubbing is just not there. Last night I turned the wheel full lock left and right and neither heard nor felt any rubbing at slow speed.

45s + spacers? Possible. Perhaps Bryce would chime in here. I used this url for help in fitment: http://www.1010tires.com/Tools/Wheel-Offset-Calculator#

As for those wheels...boy, did I get lucky or what? If anything, I can be judged guilty of not quitting. The search for wheels for this buggy was long and arduous, but boy did I learn a thing or two. The guys at the tire shop had a good laugh at my expense what with my ignorant questions.

You can prolly find them for a better price than I did; I had to be patient because they're rare...but they do come up from time to time on eBay.

They fit the wheel wells pretty sweet:
2016-07-12%2010.36.41_zpscfcuqwr6.jpg


That pic above is, of course, with the car on the lift. They fit just about perfect when the suspension is fully engaged, but I don't have a picture of that right now. :)

-Bob K.
 
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