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Can anyone fill in the ?? for me? i was trying to figure out the difference i'd have in speedo and mpg with my 155/80R13's instead of the stock 155R12's. What is the sidewall percentage?
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-Tim
93 Festy L- Little Red
98 Ranger- The golf ball
92 Accord- The $20 car (R.I.P)
73 F-100 (looking for a 302)
"Wait... you mean they pay people to fix their cars? Idiots..." -
If the Aspect ratio (as in 60 series, 70, 75, 80, etc) isn't posted in the tire size, they're usually 80 series. Old school tires (like bias ply) will usually be 78 series.
Your tire is 1" taller (about 22 3/4" tall) than the 12".
Stock Festiva tire size is 145R12 (80 series) about 21 1/8". Optional was 165/70-12 (about the same height).
Your speedo is off about 4.5% (compared to 155R12). 60mph is actually just under 63.
Compared to 145R12, you're off 7.8%. 60 is actually about 64.7 mphLast edited by JPT; 06-30-2009, 11:39 AM.Festiva: Because even my dog can build a Honda.
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'90 L. B8ME/Kia Rio 5 speed. Rio/Aspire suspension swap. :-D
'81 Mustang. Inline 6, Automatic.
'95 Eagle Summit Wagon. 4G64 Powered.
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FestivaFan covered it pretty well!
There is a speedo accuracy program somewhere where you input the tire size and it tells you how far off you are.
Will post if I find.'93 Blue 5spd 230K(down for clutch and overall maintanence)
'93 White B6 swap thanks to Skeeters Keeper
'92 Aqua parts Car
'93 Turquoise 5spd 137K
'90 White LX Thanks to FB71
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Here, can't find the one that was on here, but this one should do the trick.
1988 L - 232K miles BatstivaDumb thieves go to prison, smart ones go to work for the Government.
1989 L - 247K miles Slick
1990 L - 281K miles Orphan Annie
Let the hoarding begin!! :mrgreen:
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Think when I put the 14s on my car, figured out the speedometer was about 6 or 7 mph off, and the odometer was basically not counting about every 7th or 8th mile I was driving. But then I never ran the stock 145s, so my odometer/speedo were off pretty much the whole time I had the car.
Hmmm. There's a mental picture for ya, me with my speedo off.
1988 L - 232K miles BatstivaDumb thieves go to prison, smart ones go to work for the Government.
1989 L - 247K miles Slick
1990 L - 281K miles Orphan Annie
Let the hoarding begin!! :mrgreen:
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Here's another tire calculator. I think this is the one that used to be linked here.
Ian
Calgary AB, Canada
93 L B6T: June 2016 FOTM
59 Austin Healey "Bugeye" Sprite
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yeah thats the one - I use it all the timeOriginally posted by fastivaca View Post
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with the 155r12's on my car ....using my GPS it shows my speedo is exact. GPS says 65 and speedo says 65. No matter the speed the GPS matches the speedo."FLTG4LIFE" @FINALLEVEL , "PBH"
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My car reads fast. Speedo says 65, GPS says 63. Could be because of the Aspire trans.
BTW, I'm also running 155R12'sLast edited by JPT; 06-30-2009, 09:47 PM.Festiva: Because even my dog can build a Honda.
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'90 L. B8ME/Kia Rio 5 speed. Rio/Aspire suspension swap. :-D
'81 Mustang. Inline 6, Automatic.
'95 Eagle Summit Wagon. 4G64 Powered.Comment
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Mine was definitely way off when I had the 195s on there.
1988 L - 232K miles BatstivaDumb thieves go to prison, smart ones go to work for the Government.
1989 L - 247K miles Slick
1990 L - 281K miles Orphan Annie
Let the hoarding begin!! :mrgreen:
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wow, thanks guys. Yea, i was using the miata garage calculator, but it requires all 3 numbers, and since i only had 2, it wouldn't work.
Thanks for doin my homework for me too!!-Tim
93 Festy L- Little Red
98 Ranger- The golf ball
92 Accord- The $20 car (R.I.P)
73 F-100 (looking for a 302)
"Wait... you mean they pay people to fix their cars? Idiots..."Comment
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^^That's why we're here.
1988 L - 232K miles BatstivaDumb thieves go to prison, smart ones go to work for the Government.
1989 L - 247K miles Slick
1990 L - 281K miles Orphan Annie
Let the hoarding begin!! :mrgreen:
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