5129Re: [solectria_ev] Re: New and Old Tires Review
- Apr 3, 2009Hi again from Doug,
I live in the San Francisco bay area and go over highway 17 to Santa Cruz weekly and I use to pull the grades in 4th gear with ease. The new tires require 3rd on a couple of the steapest grades. They are bigger around but I didn't measure the old ones. Sorry bout that...
From: Ken Olum <kdo@...>
Sent: Friday, April 3, 2009 7:38:59 AM
Subject: Re: [solectria_ev] Re: New and Old Tires Review
>I have a Geo Metro Convertible and installed Kumho Solus KR21, 175/70-13. TheI'm confused. Did you have 155/80R13 before? I thought (see
>original tires were 155s as well. I found two different programs that
>calculated about 8% slower rotation of tires due to the larger diameter which
>results in a slower spedo and odometer.
http://www.tirerack .com/tires/ tiretech/ techpage. jsp?techid= 46) that
the rim-to-tread distance was proportional to the product of the first
two numbers. 155*0.80 = 124mm, 175*0.70 = 122.5mm, nearly the same.
In any event, wider tires (175mm vs. 155mm) don't seem desirable. For
efficiency, you want narrow tires with lots of pressure, like a
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