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joseccz
05-05-2008, 07:06 PM
Hi Guys
I have 13 inches rims and I was looking for new tires for my celica 1989 ST. So far I found that big brands as Michellin, GoodYear, etc. don't make tires as 165/80R13 which are the standard for my car (is this right?). I just found these tires on internet:


165/70R13
http://ssl.delti.com/cgi-bin/details.pl?ID=froogle&Country=US&typ=R-124159


175/70R13
http://ssl.delti.com/cgi-bin/details.pl?ID=froogle&Country=US&typ=R-124159


I want to buy the latest one 175/70R13 but I am not sure if this size wil fit my celica 1989 ST. Any suggestions? Right now I am using 175/70R13 which I bought because of ignorance and I don't want to make same mistake. I am loosing gas here

Please, tell me which other alternatives I can get or what could be the best without buyibg new rims

thanks a lot

Jose

joseccz
05-05-2008, 07:10 PM
I am sorry, I needed to write:
I have 13 inches rims and I was looking for new tires for my celica 1989 ST. So far I found that big brands as Michellin, GoodYear, etc. don't make tires as 165/80R13 which are the standard for my car (is this right?). I just found these tires on internet:


165/80R13
http://ssl.delti.com/cgi-bin/detail...US&typ=R-124159


175/80R13
http://ssl.delti.com/cgi-bin/detail...US&typ=R-124159


I want to buy the latest one 175/70R13 but I am not sure if this size wil fit my celica 1989 ST. Any suggestions? Right now I am using 175/70R13 which I bought because of ignorance and I don't want to make same mistake. I am loosing gas here

Please, tell me which other alternatives I can get or what could be the best without buyibg new rims

thanks a lot

Jose

Amaymi
05-05-2008, 07:14 PM
I am running 185/70R13's on my 87 Gt and they work pretty good and look decent enough for 13 in. rims. I can't really help you on the price point because I will be buying new rims soon and refuse to buy 13 in. tires. Luckily for me there was a old Accord in the back of my friends used car lot that had a set of 75% tread tires in my size so I got them for free.

CriScO
05-05-2008, 07:50 PM
:stupid: Stock size is 185/70/r13. You'll probably have better luck finding it.

Murgatroy
05-05-2008, 08:01 PM
:stupid: Stock size is 185/70/r13. You'll probably have better luck finding it.
We got a winner here.

Stock size is 185/70/13.

Look for those.

joseccz
05-05-2008, 08:17 PM
but speedometer will mark 85-87miles/h while GPS says 80 with 185/70R13 or 175/70R13... (police radar says same as GPS).

any other ideas?

thanks
Jose

Murgatroy
05-06-2008, 01:18 AM
Look on the inside of your driver's side door, it should list the stock tire size.

I know that both Chaos and Mudhoney are listed as stock tire size at 185/70/13.

I don't think the 4th Gen ST should be any different than the GT in that regard.

Your cable or tranny my have been altered. I don't see that small of a size difference accounting for a 5-7mph hour difference.

I am running a ~2% difference in my car and it comes out to be less than a mile an hour difference.

I will research this more when I get home and can browse my bookmarks, but I don't think the tire size that your issue on this matter.

tuner4life
05-06-2008, 04:56 AM
I got the Tiger Paws for my Prizm (13" also) They were fairly cheap, and they are amazing all seasons, I never got stuck last winter.

Just my 2 cents.

Murgatroy
05-06-2008, 08:59 AM
Stock Tire - 165/80R13................Tire 1 - 185/70R13
Section Width:6.49in 165mm.........Section Width: 7.28in 185mm
Rim Diameter: 13in 330.2mm..........Rim Diameter: 13in 330.2mm
Rim Width Range: 4-5.5in..............Rim Width Range: 5-6.5in
Overall Diameter: 23.39in..............Overall Diameter: 23.19in
Sidewall Height: 5.19in.................Sidewall Height: 5.09in
Radius: 11.69 in 296.92mm............Radius: 11.59in 294.38mm
Circumference: 73.48in.................Circumference: 72.85in
Revs per Mile: 889.2.....................Revs per Mile: 896.9
Actual Speed: 60 mph 100 km/h.....Speedometer1: 60.5mph 100km/h
................................................Sp eedometer Difference: 0.865% too fast
................................................Di ameter Difference: 0.86%

Murgatroy
05-06-2008, 09:12 AM
As the above show, if you are running a 165/80/13 as opposed to the stock 185/70/13, your diameter difference is going to be less than 1% for a total of one half a mile an hour difference at 60MPH.

So again, if you are running at 5-7 MPH OVER what your speedo says according to your GPS, there is a problem other than your tires.

CriScO
05-06-2008, 10:29 AM
Very interesting, how do you get/calculate that info?

Heh, this reminds me of what the coupe had when I bought it - 155/60/r13's. I mean seriously, they were like go kart tires! And for what, maybe a savings of $5.00 a tire? Okay, I'll shut up about that now. :)

Murgatroy
05-06-2008, 10:42 AM
http://www.1010tires.com/TireSizeCalculator.asp

A very useful link.

If I am not mistaken there is also an offset calculator on there as well.

CriScO
05-06-2008, 10:45 AM
I was hoping it was something like that. Bookmarked. :)

joseccz
05-06-2008, 06:57 PM
Very interesting comments...
but while using the calculator you guys provided I found that my actual 175/70R13 are making 918.7 rev/mile while the original 165/80R13 makes 889.2 rev/mile. Calculating the difference: 918.7 - 889.2 = 29.5 rev/mile...

this approx 3% loss...

not much...

but accordig to that tool, the best size for the celica 1989ST will be 175/80R13 if it doesn't hit the car's body (best respect of its rev/mile) while turning the weels

I need to think.... my transmission was rebuild so, maybe....

thanks a lot guys

Jose

joseccz
05-06-2008, 07:15 PM
Hi again:
I found this link to compare tires:

http://www.discounttire.com/dtcs/infoTireMath.dos


there I saw that if my speedometer was showing 80 my truly speed should be like 77.44. Well, it seems that something is going wrong in my transmission...

maybe I will have to find the equivalent to 175/90R13 to align speeds
(if I don't want to open the transmission)

thanks
jose

joseccz
05-06-2008, 07:27 PM
ulps, I made some wrong calculations

according to the site I provided, if my speedometer marks 80m/h while I am using 175/70/R13 then if I UPGRADE to 175/80R13 my new speed will be 84.87m/h. If I use 165/80R13 my new speed will be 82.64m/h. And with 185/70R13 this will be 81.95m/h. Hmmm, I like the 175/80R13.... do you guys believe a tire with this size may hit the car's body?

thanks again
Jose

sheep
05-06-2008, 09:08 PM
from what the computer says at work 165/80r13 are the stock size for your car, if you want a for sure fit then 155/80 and 175/70 will fit, i know this for a fact becuz i just sold some 155/80s to a guy with a 89 ST http://www.discounttire.com/dtcs/searchTiresByVehicleAndSize.do?r=UTSINT&cs=155&rd=13&ar=80&v=006921%7C1989 these are the ones we stock, i would recommend the kumhos over the mohaves anyday, good hunting

if you want to go to the 175/70s then you have alot more to choose from at about $35-$65 each

not 100% sure but i think they only make 175/80r13 in a trailer tire