never over inflating my tires again

Thank you for the reminder!

something so simple we all know, but still we goof up on.

Posted via the PriusChat mobile app.

 

It was different when that 7000 miles worth of gasoline cost more...

 

Recommended tire pressure is clearly displayed on the plate for a reason. That said, 38psi and 40psi don't seem to be that high. Just curious, what tires were you using?

 

It's a little odd to be setting the rear tire pressures higher than the front, just saying.

I'm a little incredulous that modest overinflation would result in the centres balding-out before the edges; I thought that was a thing of the past with radial tires? I wonder if your pressure gauge was off; you're even higher pressures than you thought??

Maybe too: running singificantly overinflated all the time, might be prematurely wearing out suspension and wheel bearings??

 

how many miles did you get out of each set?

 

To repeat Bisco: how many miles to you get on both those set?

Also, before the tires are actually out of reach, can you measure and tell us actual tread depths and differences, center to edge? This, along with the actual tire model and treadwear rating, will be very helpful in future discussions. Plenty of people don't experience this problem at these and even higher pressures. Normal radial tires are not supposed to do this, it was more of an old-style bias-ply tire issue.

 

Bias ply tires used to wear out the center before the edges if you overinflated, radial tires... don't, what tires are u using, are they bias?

Are you talking 200,000 miles on a set of tires?

It seems no other prius driver that inflates 42 front 40 rear has reported the same results, more input is required.

 

Overinflating means they exceed the cold PSI rating. 38 is well within the 44 PSI for the typical tire.

I have been running 44 PSI for over a decade and most definitely have not see uneven wear. Sometime about your driving location... or road texture/temperature... or the way pressure is measured... or the frequency of rotation... or the tire itself isn't being told.

What specifically is on your car?

 

Same for me. 42 to 44 psi since my 2001 Prius. The only early replacement I've had has been due to tire damage, A nail hole too close to the side to plug and a bubble from curb damage.

Mike

 

I beg to differ. I did report such a thing, but got dismissed with similar rhetoric as has been posted here.

Most people that do this (overinflated) do not measure their tires on a regular basis (as I did when collecting my data) and would probably not even notice that that the wear was uneven. They'd just accept the information from whoever was telling them their tires were worn out and needed replacing.

Radials might be more resilient that bias tires, but they will still wear in the centre if over-inflated, it just maybe too subtle to notice without measuring.

For the record, I can get 60+ MPG with the standard inflation.

I think that for most people it is wishful thinking, placebo effect if you will, mostly due to the fact, that when they paid no attention to their tires, they were, more than likely, on average running under-inflated so when they start paying attention and they over-inflate, miraculously they are getting "much better" gas milage.

When coming back down (in steps) to placarded from a high of running 42/40, I noticed no real measurable difference in MPG.

I have also observed that same difference between GY Assurance and Ecopia, although our versions of both are different variations to the those available in NA.

As they say YMMV.

 

Once the tire pressure gets to a certain point I would think the MPG gains would be minimal but what would that number be?

 

36-37 IMHO.

 

Cronic over-inflater here. Last three sets of tires lasted at least 75k miles no abnormal wear. 2 of the sets on our Civic Hybrid @ 55 psi all around. That level hands out too much abuse in my PIP, now I'm strictly 45 year round...good for a couple of MPGS between 55 and 65 mph.

 

Which Assurance model?
"Tire Line Construction Tire Size Ratings
Traction* Temperature** Treadwear***
Assurance All Season Radial All Sizes A B 600
Assurance Authority (H&V) Radial All Sizes A A 580
Assurance Authority (T) Radial All Sizes A B 620
Assurance Comfortred Radial All Sizes A B 700
Assurance Comfortred Touring (T&H) Radial All Sizes A B 740
Assurance Comfortred Touring (V) Radial All Sizes A B 640
Assurance CS Fuel Max Radial All Sizes A B 600
Assurance CS Tripletred Radial All Sizes A B 740
Assurance Fuel Max (H/V) Radial All Sizes A A 580
Assurance Fuel Max (S) Radial All Sizes A B 540
Assurance Fuel Max (T) Radial All Sizes A B 620
Assurance Touring (H) Radial All Sizes A A 580
Assurance Touring (T) Radial All Sizes A B 620
Assurance Tripletred (H) Radial All Sizes A B 740
Assurance Tripletred (T) Radial All Sizes A B 740
Assurance Tripletred (V) Radial All Sizes A A 640
Assurance Ultratour Radial All Sizes A B 620
Assurance Weatherready Radial All Sizes A A 700"

The lowest treadware rating in that line looks like 540, which should produce vastly more than 20k miles, or even 20k+7k miles. In modern times I've never had tread wear out that quickly, even with shorter treadwear ratings and higher pressures than you mention.

 

At 60psi and 50,000 miles the edges wore off but the center had plenty of tread.

This was on Goodyear assurance energy savers