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DaveEV
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Re: Bridgestone EP422 tires swapped for Michelin Primacy MXV

Wed Oct 03, 2012 11:08 pm

GeekEV wrote:I feel like I took a small hit with them, but I also last a bar around the same time so it's hard to say.
If you're comparing the new tires to your old ones, they are very likely to be slightly worse. But they should improve after a thousand miles or so as they break in.

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TomT
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Re: Bridgestone EP422 tires swapped for Michelin Primacy MXV

Thu Oct 04, 2012 8:43 am

New tires - even of the same make and model - will always have higher rolling resistance than older ones. As the tires age, the tread depth decreases and the rubber hardens slightly, both of which decrease rolling resistance.
GeekEV wrote:I feel like I took a small hit with them, but I also last a bar around the same time so it's hard to say.
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thankyouOB
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Re: Bridgestone EP422 tires swapped for Michelin Primacy MXV

Sat Oct 13, 2012 8:39 am

I did this swap, too.
and the first day's m/kWh went down from about 4.5+ to 4.1- for my commute of 50 miles.

is this logical, that m/kwh would drop so much?
is there such a thing as, the tire will wear in and increase its rolling speed?

by the way, the ecotopia's went bad with one hit by a nail and a bad patch job, and another with a gouge and a bulge from road hazards. i had 17.5k on them.

cost was about $175 per tire with tax, install, full road hazard and replacement, and lifetime rotate and balance. discount tire.

finally, the car has a slight shimmy now at 60mp and up speeds.
i first thought it was the gripping tread, now i am thinking there is a balance issue. what do you all think about that?
Last edited by thankyouOB on Sat Oct 13, 2012 1:24 pm, edited 1 time in total.
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thankyouOB
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Re: Bridgestone EP422 tires swapped for Michelin Primacy MXV

Sat Oct 13, 2012 12:57 pm

in answer to a question (pm), there is not steering wheel jiggle or vibration.
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DeaneG
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Re: Bridgestone EP422 tires swapped for Michelin Primacy MXV

Sat Oct 13, 2012 8:19 pm

thankyouOB wrote:in answer to a question (pm), there is not steering wheel jiggle or vibration.
I'd take it back to the shop and have the balance checked again. No steering wheel vibration might mean the problem is on one of the rears. Or just that it's too faint to feel through the wheel.
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LEAFfan
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Re: Bridgestone EP422 tires swapped for Michelin Primacy MXV

Sat Oct 13, 2012 8:33 pm

TomT wrote:Nope, I detected no real difference. And the latest CR test rates them both as having excellent rolling resistance. The MXV4 finished first in their tests and the Ecopia 422 last.
Electric4Me wrote:Tom,
do you still feel the tires had little impact on your efficiency? I need to reply my stock tires now and I'm curious about your experience.
Thanks, Bill
Tom, what tire pressure are you running?
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TomT
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Re: Bridgestone EP422 tires swapped for Michelin Primacy MXV

Sat Oct 13, 2012 9:07 pm

Initially I was running 40 but I noticed little difference in ride at 44 so that is what I am now running.
LEAFfan wrote:Tom, what tire pressure are you running?
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thankyouOB
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Re: Bridgestone EP422 tires swapped for Michelin Primacy MXV

Sun Oct 14, 2012 8:42 am

a PM mentioned the possibility of tramlining--tires are so precise that they track road grooves.
a consumers reports buyer in AL said this:
I had the local retail store re-balance them (and they needed it) but, (even when warm) these tires still have an annoying vibration / shake betweem 60 -65 (they smooth out some on the interstate at speeds of ~ 70

makes me wonder if the tires are not a good choice as 60-65 is my driving/range freeway sweetspot.
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DaveEV
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Re: Bridgestone EP422 tires swapped for Michelin Primacy MXV

Sun Oct 14, 2012 10:13 am

I wonder if the tires are slightly out of round? I had a set of GoodYear FuelMax tires on our Prius where 2 of them were enough out of round that they were replaced. Might try rotating them and see if it's any different.

I had the MXV4s on my previous car, and they were really smooth at all speeds.

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TomT
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Re: Bridgestone EP422 tires swapped for Michelin Primacy MXV

Sun Oct 14, 2012 3:59 pm

I do most of my driving on freeways at that same speed range and have not had a problem. They do tramline some but so did the Ecopias and I believe it to be more a result of the Leaf suspension design and alignment settings. The improvement in braking, handling, tire wear, and tire robustness was well worth the swap to me. My efficiency feel by only about 3 percent so that was not a big consideration either.
thankyouOB wrote:makes me wonder if the tires are not a good choice as 60-65 is my driving/range freeway sweetspot.
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