jray3
Posts: 1669
Joined: Tue Dec 06, 2011 1:05 am
Location: Tacoma area, WA
Contact: Website

Premature Tire Wear

Tue Jun 26, 2012 4:27 pm

Ok gang, I'm past 6600 miles now and am seeing feathering on the outside leading edge of my front tires. :? (Rounded rear edge of the tread block, sharp, extended front edge, the edge that makes first contact with the road.) It's most pronounced on the drivers' side, ans most of my miles are solo. That outside corner is going to look like a sick goldfish pretty soon.

Feathering like that's usually a sign of excess toe-in, eh? Could also be hard cornering, which may be exacerbated by the tall skinny tires. I drive some twisty hills every day.
I'm also running 60 psi, which would make the tire 'stand on it's corner' more during a turn.

Anybody else seeing such? The rears are looking great. Of course, no rotations have been done.
2012 i-SE "MR BEAN" 110,300 miles
2016 KIA SOUL EV, 90 kW, 27 kWh, 34k miles
2000 Mazda Miata EV, 78 kW, 17 kWh
1983 Grumman Kurbwatt EV,170 kW, 32 kWh
1983 Mazda RX-7 EV 43 kW 10 kWh
1971 "Karmann Eclectric" EV 240 kW 19 kWh

fjpod
Posts: 529
Joined: Tue Apr 17, 2012 2:31 am
Location: NYC

Re: Premature Tire Wear

Tue Jun 26, 2012 4:29 pm

I'm going with the 60 psi. A bit excessive, no?

NeilBlanchard
Posts: 356
Joined: Tue Jun 19, 2012 11:26 am
Location: Maynard, MA Eaarth
Contact: Website

Re: Premature Tire Wear

Tue Jun 26, 2012 6:24 pm

Sounds like an alignment problem; more than inflation issues? If it is on both front tires, on their outside edges, then it sounds like a toe-in problem. Or, maybe a slipped belt in the tire, if it is only on one side?

High inflation would cause a bulge in the center of the tread, not an asymmetrical feathering. High inflation of steel belted radials almost never causes any issues directly.

Having said that, I'd try dropping the pressure to 50PSI (if the sidewall max is 51?), as I think there is diminishing returns of rolling resistance, and you would lower the risk of damaging the tire.
Sincerely, Neil

http://neilblanchard.blogspot.com/

Don
Site Moderator
Posts: 2924
Joined: Thu May 10, 2012 3:55 pm
Location: Biloxi MS

Re: Premature Tire Wear

Wed Jun 27, 2012 6:01 am

I really doubt it's a toe problem . . . . unless you've hit something and thrown the alignment off - These cars are set up with next to no toe to reduce rolling resistance

The car does tend to understeer a bit, probably partly due to the front end being light and the tires so narrow, compund that with agressive driving in the twisties and 60 psi in the tires which doesn't allow them to flex and I think you've created the 'perfect storm' for tire wear. If you don't want to change what's causing it, I think your only solution is to buy new tires every 10K or so

Don
2012 iMiEV SE Premium, White
2012 iMiEV SE, White
2017 Chevy Volt Premier
2014 Ford Transit Connect XLT SWB wagon, 14,000 miles
1979 Honda CBX six into six

Wee John
Posts: 134
Joined: Thu Jan 12, 2012 6:15 am
Location: SF East Bay

Re: Premature Tire Wear

Wed Jun 27, 2012 6:40 am

jray3 wrote:Ok gang, I'm past 6600 miles now and am seeing feathering on the outside leading edge of my front tires. :? (Rounded rear edge of the tread block, sharp, extended front edge, the edge that makes first contact with the road.)
Feathering like that's usually a sign of excess toe-in, eh? Could also be hard cornering

Anybody else seeing such? The rears are looking great.


I saw the exact same wear last week, only I am seeing it over the entire surface of the tread. My mileage is at 6700 right now. I am running at 40psi.
It was bad enough that I noted it on the concerns of Mitsubishi's customer survey that I received by email.

jray3
Posts: 1669
Joined: Tue Dec 06, 2011 1:05 am
Location: Tacoma area, WA
Contact: Website

Re: Premature Tire Wear

Wed Jun 27, 2012 7:53 am

Thanks for the bad news corroroboration, John. One typo- I'm only running 50 psi (48 on this chilly Seattle morn).
I'm bringing the pressure down to 45, based also on the percentage load that's on the tire (about 680 lb of 780 lb capacity). Am also rotating side-side. (Yeah, if this were science-tiffic I'd only change one variable.)
2012 i-SE "MR BEAN" 110,300 miles
2016 KIA SOUL EV, 90 kW, 27 kWh, 34k miles
2000 Mazda Miata EV, 78 kW, 17 kWh
1983 Grumman Kurbwatt EV,170 kW, 32 kWh
1983 Mazda RX-7 EV 43 kW 10 kWh
1971 "Karmann Eclectric" EV 240 kW 19 kWh

Don
Site Moderator
Posts: 2924
Joined: Thu May 10, 2012 3:55 pm
Location: Biloxi MS

Re: Premature Tire Wear

Wed Jun 27, 2012 10:21 am

Don't know if rotating them will do you much good - The outside edge will still be the outside edge, just turning the opposite direction so it may make it feather the other way

A better solution might be to wear them to about 40% and then dismount them from the wheels and install the tires on the opposite wheels . . . . that way your worn outside edge would then be on the inside and they would be turning the same direction again

Don
2012 iMiEV SE Premium, White
2012 iMiEV SE, White
2017 Chevy Volt Premier
2014 Ford Transit Connect XLT SWB wagon, 14,000 miles
1979 Honda CBX six into six

jray3
Posts: 1669
Joined: Tue Dec 06, 2011 1:05 am
Location: Tacoma area, WA
Contact: Website

Re: Premature Tire Wear

Wed Jun 27, 2012 10:56 am

Yep Don, that reverse remount will be on the option block. I went ahead with the rotation because the feathering was bad enough to start a bit of chunking/tearing on the sharp edges. Time to reverse that. Another thing I noticed when rotating the tires was that the rubber seems softer than I'd expect on a LRR tire- perhaps a high silicone compound. A shard of glass had buried itself deeply in a tread block without getting started in any sort of groove. There's lots of pebbles stuck in the grooves, but I haven't seen any glass penetrate solid rubber and stay there in quite a long time... (not since I was in the glass recycling business 15 years back!)
2012 i-SE "MR BEAN" 110,300 miles
2016 KIA SOUL EV, 90 kW, 27 kWh, 34k miles
2000 Mazda Miata EV, 78 kW, 17 kWh
1983 Grumman Kurbwatt EV,170 kW, 32 kWh
1983 Mazda RX-7 EV 43 kW 10 kWh
1971 "Karmann Eclectric" EV 240 kW 19 kWh

iMiEVNZ7
Posts: 122
Joined: Mon Feb 13, 2012 7:45 pm

Re: Premature Tire Wear

Wed Jun 27, 2012 4:44 pm

HI Joe,
Could it be the really good turning circle causeing it ? with the ability to turn tightly, it could scrub more than say if still using the same amount of turning circle as a usual car ?

We used to do deliveries and noted the increased tyre wear from the constant U turns to get to the correct side of the street to do the delivery and then another to get back to the shop.

Changed jobs and found the tyre wear back to normal.

On the subject of jobs, could you advise me on how to turn approx 20 buckets of 2 gallon size, full of broken window glass, into say a sculpture or large ball made of glass.?. The recylcing place here does not accept window glass for recycling..

What temperature would it melt at ?. could we get a big steel mould made and heat it up with the broken glass in it with a blowtorch ?. A big one or maybe a welding torch ?.

jray3
Posts: 1669
Joined: Tue Dec 06, 2011 1:05 am
Location: Tacoma area, WA
Contact: Website

Re: Premature Tire Wear

Wed Jun 27, 2012 4:59 pm

Heya kiwi, how'd ya know I'm really a Joe who works in the recycling industry and not a JRay :lol: ? I'll PM ya on glass.

SO, I stopped by my dealer and they thought the tires looked like bad alignment and agreed to redo the alignment under warranty. Not happening 'till Monday, so I'll report back on the results then. I think it helps when I bought a cargo mat from the parts counter first.. ($60, but it's not loop carpet like the OEM floor mats, instead it's cut pile. Has nice cutouts for the child seat anchors and an iMiEV embroidered logo..)
2012 i-SE "MR BEAN" 110,300 miles
2016 KIA SOUL EV, 90 kW, 27 kWh, 34k miles
2000 Mazda Miata EV, 78 kW, 17 kWh
1983 Grumman Kurbwatt EV,170 kW, 32 kWh
1983 Mazda RX-7 EV 43 kW 10 kWh
1971 "Karmann Eclectric" EV 240 kW 19 kWh

Return to “Wheels - Tires”