Re: [alfa] Tyres (sic) Again

["The Baylys" <dabaylys@xxxxxxxxxxxxxx>]

Biba,

It was not I with the Yokies.  My tyres are Bridgestone at the front and
some Korean brand at the rear.  They measure almost identically.

Fitting an LSD has no interrelationship with fitment of taller tyres.  I'd
simply use whatever combo you come up with, borrow a GPS from someone, and
check the speedo reading on a long straight piece of road (both directions).

Given the likely inaccuracy of your speedo you stand a 50/50 chance that
your changes will actually correct any error.

Beatle
'67 Duetto
Oz
----- Original Message ----- 
From: "alfacybersite" <acs@domain.elided>
To: "AD" <alfa-digest@domain.elided>; "The Baylys" <dabaylys@domain.elided>
Sent: Monday, July 12, 2004 7:46 AM
Subject: [alfa] Tyres (sic) Again


> Beatle, I appreciate your efforts regarding the size of tyre, oops, tire
> you're using. Had hoped to hear from a 15" Duetto owner, but any info is
> helpful. Did you say you are using Yokohama Avid H4's (195/65-14)? I
> just measured a brand new one and it was just a hair over your
> measurement at 75.5 inches.
>
> Having just been "shopping" for Spider seats in the "Original Alfa Romeo
> Spider" book, I noted the paragraph which reads: "Strangely Alfa Romeo
> opted to keep the shorter 4.55:1 (as used on the Duetto) final drive
> instead of the 4.3:1 ratio usually fitted in Europe (for the '69
> Spider), but the limited -slip differential option was still available."
>
> This is a general question to all, but gear ratios and final drive
> ratios have always been a huge mystery to me. Sorry to have to admit it
> in print, but...: So's if I go taller (tyres / tires wise) than original
> on the '69 Round-Tail am I in even bigger trouble or am I correct that
> the Duetto, which has just been determined to have the same final drive
> as the '69 Round-Tail (and using Beatle's figure) "should" have a tire
> with the circumference of 77.8" and since this is a "shorter" final
> drive, it's okay to go a bit taller? Got that?
>
> Turns out I have a couple of limited-slip diffs, which I assume would
> need rebuilding. Would one help or hurt my tall tire situation or not
> make a whit of difference?
>
> Biba
> Irwindale, CA USA
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