5124Re: New and Old Tires Review
- Apr 3, 2009Hi Joshua,
Let me give you an update.
The original tire installer (Discount Tires) inflated the Sumitomo's to 32psi and I had poor efficiency numbers. In February, I increased the tire pressure to the maximum recommended on the tire sidewall: 55psi. This made a BIG difference, and I now have efficiency numbers just as good as my former completely bald (with steel belt showing) Dunlops.
Regarding the tire sizes, I did not have any problems in switching from P155/80 R13 to P175/70 R13. The original rims worked just fine.
I drove the car in Chicago area winter (February on) with the Sumitomo's at 55psi without any complaints. Yes, I did get stuck in the driveway once with 6 inches of snow. I won't blame the tires on that though.
I like the new tires and now recommend them.
--- In firstname.lastname@example.org, "Joshua Goldstein" <jg@...> wrote:
> Thanks to Todd for his tire info. I have some other tire questions. My '99
> Force has worn through its tires way too quickly (from overinflating?
> misalignment?) and I'm looking for replacements. (We do almost all
> around-town and country-road driving.) The originals were P155/80 R13's but
> people on this list seem to have been replacing those with P175/70 R13's.
> Does anyone think that's a good/bad idea? (There aren't that many P155/80's
> out there.)
> Also, the Sumitomos that Todd and others have bought are summer tires and
> I live in New England so does anyone have an idea for an all-weather tire?
> Presumably that would increase rolling resistance but then again it's nice
> not to go sliding into snow banks as happened this winter (no harm done this
> This leads to the more philosophical question -- how to reduce rolling
> resistance other than overinflating the tires or having them get bald (both
> of which reduce control). Someone posted a link to the Consumer Reports
> article on rolling resistance, but the recommended tires were all R14 and
> Wondering how others have dealt with these tire issues...
> Joshua Goldstein
> '99 Force
> Amherst, MA
> ----- Original Message -----
> From: "Todd Martin" <larsthelean@...>
> To: <email@example.com>
> Sent: Saturday, January 10, 2009 5:44 PM
> Subject: [solectria_ev] New and Old Tires Review
> > In April 2006, I bought my 1997 Solectria Force with 9500 miles on it.
> > It came with Dunlop SP40 A/S tires (P155/80 R13 79S). The previous
> > owner explained that the original Force tires had died of old age (tire
> > rot). I kept the tire pressure at 44psi instead of the recommended
> > 35psi for better rolling efficiency. Over 2 years and 8 months, and
> > 21000 miles, the Dunlop tires wore down to the steel belt. My
> > efficiency numbers had gradually improved with the very smooth tires
> > gliding down the road.
> > In December 2008, I bought Sumitomo HTR200 tires (P175/70 R13 82H)
> > which fit on the same original rims, even though the tires are a
> > slightly different size. Discount Tire charged me $85.56 to install
> > the tires with "computer spin balance" and I paid $43.40 per tire
> > ($231.90 total including shipping etc) from www.tires-easy.com. Total
> > expense was $317.46 I chose these tires since they were recommended by
> > the Green Seal report for low rolling resistance.
> > So far, my efficiency has been pretty poor, with a loss of 15-20%.
> > Some of this is because Discount Tires inflated my new tires to 32psi,
> > and I haven't increased that yet (it's been cold outside). A lot of
> > this is because these are new tires instead of bald tires.
> > Todd Martin
> > '97 Force
> > Elgin IL
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