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Bridgestone EP422 tires swapped for Michelin Primacy MXV4s.

Posted: Tue Jan 17, 2012 2:51 pm
by TomT
UPDATE: THANKS EVERYONE FOR YOUR INTEREST; ALL FOUR EP422s ARE NOW SOLD.

Re: Bridgestone EP422 tires (singles or set) for Leaf for sa

Posted: Wed Jan 18, 2012 9:32 am
by DeaneG
Which Michelins did you go with? Please let us know what you find out - grip vs energy efficiency, quietness, etc.

Re: Bridgestone EP422 tires (singles or set) for Leaf for sa

Posted: Fri Jan 20, 2012 1:00 pm
by TomT
I went with the Michelin Primacy MXV4 and will let you know what differences I note... After much consideration, I decided on these over the somewhat newer (and more expensive) MXM4 for the Leaf... I'm going to have them installed this weekend so I'll report back shortly thereafter...
DeaneG wrote:Which Michelins did you go with? Please let us know what you find out - grip vs energy efficiency, quietness, etc.

Re: Bridgestone EP422 tires (singles or set) for Leaf for sa

Posted: Fri Feb 03, 2012 2:38 pm
by TomT
DeaneG wrote:Which Michelins did you go with? Please let us know what you find out - grip vs energy efficiency, quietness, etc.
Michelin Primacy MXV4 from Costco in the 91H version. I now have enough mileage on them and in both wet and dry conditions to make some observations:

Pluses:
Quieter. About 3db under like conditions compared to the EP422s.
Better wet and dry braking, dramatically so in fact.
Better steering turn-in and on-center feel.
Increased adhesion and much better handling, particularly near the limit.
Appear to be more robust construction and with a higher weight rating than the EP422s.

Cons:
Cost.
Tends to follow rain sipping on freeways somewhat more (tramlining).
Slightly heavier.

Overall assessment:
They dramatically transform the driving character and fun quotient of the vehicle and are money well spent. I also feel more confident that these tires will not strand me. Admittedly, I am more sensitive to tires than some so others enthusiasm for the difference may vary... I am very happy with the upgrade.

I have not been able to detect any significant difference in efficiency due to the swap. My Miles/Khw is about 2-3 percent lower for the trips I regularly take - I typically average 4.4 long-term - compared to what it was before the change. I expect this to improve as the tires wear in since new tires are always less efficient. Interestingly, my efficiency actually seemed to go up slightly in the rain... Perhaps they channel water away better than the EP422s... They certainly handle and brake well in the wet.

Re: Bridgestone EP422 tires swapped for Michelin Primacy MXV

Posted: Sat Feb 04, 2012 9:31 am
by DaveinOlyWA
2-3% is insignificant IMHO as far as range goes. do you have the SOC meter? if so, that info alone will increase your range 10% simply from being informed!

keep us posted!

Re: Bridgestone EP422 tires swapped for Michelin Primacy MXV

Posted: Sat Feb 04, 2012 9:33 am
by TomT
Funny you should ask that. I just finished building mine yesterday! I picked the kit up from Gary earlier this week.
DaveinOlyWA wrote:2-3% is insignificant IMHO as far as range goes. do you have the SOC meter? if so, that info alone will increase your range 10% simply from being informed!

Re: Bridgestone EP422 tires swapped for Michelin Primacy MXV

Posted: Sat Feb 04, 2012 10:00 am
by DaveinOlyWA
TomT wrote:Funny you should ask that. I just finished building mine yesterday! I picked the kit up from Gary earlier this week.
DaveinOlyWA wrote:2-3% is insignificant IMHO as far as range goes. do you have the SOC meter? if so, that info alone will increase your range 10% simply from being informed!

it is all psychological of course, but i would have never made 100 miles in winter without it. its simply too unnerving to drive nearly 10 miles after the display goes to "_ _ _" but with the "real" SOC displayed i knew i could actually drive more than a few blocks away from home without having to worry about getting a tow!

earlier i went 93.7 miles on a much better day statistically only to give up because i did not know i could drive as far as i could have. i would have been easily in the 105 mile range but once again, did not want to get too far away from home. i live situated between two lakes on a street with 13 houses so there is no "neighborhood" for me to circle. the closest place that i could even consider this is a few miles away and it only provides a circuit barely a mile long so it gets old quick

trust me, the SOC is like getting a 10% boost in your range. it gave me at least that much confidence!

Re: Bridgestone EP422 tires swapped for Michelin Primacy MXV

Posted: Wed Oct 03, 2012 6:07 pm
by Electric4Me
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

Re: Bridgestone EP422 tires swapped for Michelin Primacy MXV

Posted: Wed Oct 03, 2012 9:16 pm
by TomT
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

Re: Bridgestone EP422 tires swapped for Michelin Primacy MXV

Posted: Wed Oct 03, 2012 10:39 pm
by GeekEV
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.