[urq] tires and premature aging

[JAM]

I have 225-50-15s on the Ronal 8" wheels on my early '83.  Recently, I
clocked my speed at a constant 60 mph indicated by the speedo, I was
actually going 62 per my TomTom GPS.  I think it wouldn't be a big deal to
go down a bit on sidewall, maybe even to a 205-50-15.  If you look up that
size, there are tons of options out there in excellent rubber for reasonable
money, thanks in part to Miata people among others commonly using that size.
They are also commonly using that size on their 15" wheels and they're
really not stretched since 205mm = 8.07".  Google 6UL for pics.  I started
thinking about running the 205-50s when I saw a Gobi 20vt converted urq for
sale that was running Bridgestone Potenza RE-11As.  I had trouble making out
for sure that they were 205s but then I looked up tire sizes offered in the
RS-11a and only 195 and 205's are offered in 15" tires.  Maybe some food for
thought?

Just my $.02,
Jason Mawhinney  #188


-----Original Message-----
From: urq-bounces at audifans.com [mailto:urq-bounces at audifans.com] On Behalf
Of Tony Lum
Sent: Saturday, January 18, 2014 1:30 PM
To: urq at audifans.com
Subject: Re: [urq] tires and premature aging

Forgot to copy the reply to the list
+++++++++++++++++++++++++++++++++++++++++++++++++++++


Hi Lino,

My drivetrain is now different from the original. When I  swapped the engine
from my '87 5kcstq, I also swapped the 016 transmission.  Instead of ..78 5th
gear, my 5th gear is now .73.

By
 undersize, I'm referring to the 205-60/15 tires that came stock on the
5kcstq.  According to the 1010 tire calculator (205-60/15 stock):

215-50/15 = -4.95%  undersized, no tires <--This is causing my speedometer
to run faster hence the premature aging.
225-15/15 = -3.35% undersized, a few tires
215-60/15 = +1.9% oversized, many tires available

Of
 course 205-60/15 would be just right but are too narrow for the 15x8
Ronals.  I would need to switch to 15x7 Fuchs, but I love the look of the
Ronals.

Tony
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