I believe the tire sizes given below are for the non-SI versions. I
just went outside and looked at my '87 SI - the tires are 185/60R14s
and I haven't changed sizes. My manual is in the garage, but again,
the the non-SIs have 13 inch tires, the SI has 14 inch.

Dan


On Sat, 09 Aug 2003 16:24:25 GMT, Randolph <trash@junkmail.com> wrote:

>I have the Honda service manual for the 1987 Civic (US model) and it
>confirms what the previous poster said. 175/70R13 82T to be precise.
>
>
>
>David L wrote:
>>
>> According to Tirerack (www.tirerack.com), the original tire size for the '87
>> Civic Si hatchback is 175/70-13.
>>
>> Not really good at math, but there is another website
>> (www.miata.net/garage/tirecalc.htm) which gives the calculations you're
>> looking for in different size tires. Based on the change to 185/65-15 your
>> speedometer would read 8% too slow. When your speedometer reads 60mph
>> you're actually traveling at 64.8mph.
>>
>> If you want to change to a 15" tire, get the 195/50-15. That would only
>> make your speedometer read .1% too slow, so if your speedometer reads 60mph
>> you're actually traveling at 60.1mph. You can also opt for 185/60-14 which
>> would read .4% too slow so when your speedometer reads 60mph you're actually
>> traveling at 60.3mph. All of the above info was gathered from the two
>> websites quoted.
>>
>> It'll probably be more trouble that what it's worth to try and change the
>> speedo. Upgrade to the appropriate corresponding tire size instead.
>>
>> Hope this helps,
>> -Dave
>>
>> "Tina Venne" <TinaVenne@comcast.net> wrote in message
>> news:f959jv0rgaa731mf5avckpqu4ac1c780ko@4ax.com...
>> > Can anyone tell me what the original size tires were from the factory
>> > on the 1987 Civic Si?
>> >
>> > If someone is good at math, can you tell me what the speed difference
>> > would be, as indicated on the speedometer, between this stock size and
>> > the currently installed P185-65-R15 at, say, 60mph?
>> >
>> > Also, where can one obtain the driven gear (or whatever it is called)
>> > that would correct the speedometer for the above current tire size?
>> >
>> > Thanks a bunch.