Greetings all:
To add one more data point to the TR3/4 speedometer thread, I have a
TR4 with a speedometer calibration number of 1184. For what it's worth,
it is spot-on accurate at 35 mph, according to those radar feedback
signs that the police occasionally place on our roads. I'm using 165/15
Cooper SportMaster tires but can't say, offhand, what axle ratio I have.
Bob Sharp
Michigan
64-ish TR4
Subject: Tr3a speedos
>>>>I picked up a replacement speedo for the '3 a little while ago. I
finally get
>>>>around to installing it. I notice the "model" number on the face
is different,
>>>>mine is a 1180 the replacement is a 1200. Is there a difference I
should care
>>>>about? What is the 1200 from?
___________________
>>>The 1200 refers to the calibration, and your new speedometer will
be
>>>inaccurate if the 1180 was accurate. Tony Rhodes gives a detailed
>>>explanation of this in his instructions for repairing speedometers
at
>>>http://mywebpages.comcast.net/rhodes/speedo.html
___________
>>Sounds like you're looking at the calibration number, which
indicates how many
>>revolutions the speedo cable makes in a traveled mile.
http://triumphowners.com/resources.cgi?articleID=111194&parentID=111193§ionID=111025
____________
>FWIW, the TR2/3/3A Spare Parts Catalogue lists only two speedometers:
one
>each for "MILE" and "KILO." The TR4 SPC, though, lists four different
speedos
>each for MILE and KILO:
>One (each) for 5.50/5.90 x 15" tires and 3.7:1 ratio axle
>One (each) for 5.50/5.90 x 15" tires and 4.1:1 ratio axle
>One (each) for Michelin X 165 x 15" tires and 3.7:1 ratio axle
>One (each) for Michelin X 165 x 15" tires and 4.1:1 ratio axle
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