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Old 11-20-2011, 11:14 AM   #11 (permalink)
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It would interesting to do a city route then a highway route with the donuts at 70 psi vs the Stones at 51. I would be willing to bet that based on your previous experiences with donuts that they would shine bright on the highway route based on lower aero drag and the stones might, or not, shine on the city route.

Seems like a load rating/aero drag compromise is what we are looking at.
If so, then the skinniest tire (preferably tall) with a high load rating is what we are after for overall performance.

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Old 11-20-2011, 01:57 PM   #12 (permalink)
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FYI, I just happened to calculate the "real world" (ie. not scientific) impact of switching to the RE92 tires on the ForkenSwift:
  • 345 Wh/mi ... 10 drive/charge cycles before switching tires
  • 285 Wh/mi ... 10 drive/charge cycles since switching tires
That's a 21% increase in range. (Or a decrease in battery discharge for the same distance driven, with associated benefits to pack life.)

FYI, I'm not actually planning any more tire tests. I will just aim to use RE92's wherever I can on the Suzukiclone fleet.

Also, for a pile of reasons, I am DEFINITELY NOT suggesting that other people will see anything close to this efficiency increase if they switch to these tires.
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Old 11-20-2011, 02:56 PM   #13 (permalink)
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What's the weight of that vehicle?

What's the load rating on the RE92's vs the donuts?
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Old 11-20-2011, 05:38 PM   #14 (permalink)
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RE92 Max Load: 937 lbs.

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Old 11-21-2011, 03:13 PM   #15 (permalink)
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I lost that bet. Could have swore the RE's would've had a better load rating.

So why are the RE's better? This is the burning question as we have been sold on load rating for RR (according to most test data) and your results lean away from that.

Or is it a case of psi (weight of each corner of car) acting upon the pavement?
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Old 11-22-2011, 01:10 AM   #16 (permalink)
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Quote:
Originally Posted by BHarvey View Post
I lost that bet. Could have swore the RE's would've had a better load rating.

So why are the RE's better? This is the burning question as we have been sold on load rating for RR (according to most test data) and your results lean away from that.

Or is it a case of psi (weight of each corner of car) acting upon the pavement?
Construction materials would be my first guess. Higher silica content, orange peel oil or what have you. Load is not the only factor that determines RR.
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Old 11-22-2011, 07:18 AM   #17 (permalink)
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Quote:
Originally Posted by F8L View Post
Construction materials would be my first guess. Higher silica content, orange peel oil or what have you. Load is not the only factor that determines RR.
As a matter of fact, load rating is a minor player compared to the differences in tread compound - which, of course, varies considerably from tire to tire.
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Old 12-27-2011, 10:15 AM   #18 (permalink)
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I did a search to see the availability of these bridgestone potenza RE92's. I see they are available everywhere, new and used. However I don't see this tire being advertized as a low RR. What's up with that? All they advertize about it is that its popular cuz it came stock with toyota camrys and other vehicles.
Could it be the bridgestone potenza RE92's that I see for sale at all these online tire places is not the same tire as the ones used in the OP's tests?

Just type "bridgestone potenza RE92" into google and u get a whole bunch of vendors advertizing these tires. Not one of them mentions low rr

What's up with that?
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Old 12-27-2011, 01:46 PM   #19 (permalink)
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Quote:
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Could it be the bridgestone potenza RE92's that I see for sale at all these online tire places is not the same tire as the ones used in the OP's tests?
You are correct.

The size (165/65 R14) of RE92 made for the first gen. Insight is definitely LRR, and is unlike the other RE92 sizes available.

If you view the listing at Tire Rack for the Insight sized RE92, it identifies that size as Low Rolling Resistance.

But if you view the 185/60 R15 size of that tire (I picked that one at random), it does not list it as LRR.
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Old 12-27-2011, 02:32 PM   #20 (permalink)
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Quote:
Originally Posted by mans View Post

Just type "bridgestone potenza RE92" into google and u get a whole bunch of vendors advertizing these tires. Not one of them mentions low rr

What's up with that?
The only size that is LRR is 165/65R14 that came stock on the 2000 to 2007 Honda Insight and from what I remember people claim a 4 to 7mpg affect from using these tires, in other sizes of tires there are brands that have LRR models as well but most of them span most if not all of their sizes in that model.

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