Pics of my Car!
what size tires are you running?
09-20-2001, 09:40 AM
#13
Originally posted by pawn
225/40ZR18
225/40ZR18
http://forums.off-topic.net/attachme...postid=1037737
i am running 235/40 or 245/45
check this site out..
http://www.miata.net/garage/tirecalc.html
and
https://maxima.org/maxfaqs/sub_tires...#TiresWheels_2
09-20-2001, 09:42 AM
#14
Senior Member
Thread Starter
Join Date: Mar 2001
Posts: 2,098
Originally posted by SprintMax
thats your problem.. your speedo is way off.. and i notice that your tires look too big..
http://forums.off-topic.net/attachme...postid=1037737
i am running 235/40 or 245/45
check this site out..
http://www.miata.net/garage/tirecalc.html
and
https://maxima.org/maxfaqs/sub_tires...#TiresWheels_2
thats your problem.. your speedo is way off.. and i notice that your tires look too big..
http://forums.off-topic.net/attachme...postid=1037737
i am running 235/40 or 245/45
check this site out..
http://www.miata.net/garage/tirecalc.html
and
https://maxima.org/maxfaqs/sub_tires...#TiresWheels_2
09-20-2001, 09:50 AM
#18
FYI:
with 225/40
your speedo is .8 seconds fast every 1 mph
with 235/40
your speedo is .3 seconds slow every 1 mph
http://www.miata.net/garage/tirecalc.html
stock tire being 215/55 for the SE ..
but hey.. what do i know
with 225/40
your speedo is .8 seconds fast every 1 mph
with 235/40
your speedo is .3 seconds slow every 1 mph
http://www.miata.net/garage/tirecalc.html
stock tire being 215/55 for the SE ..
but hey.. what do i know
09-20-2001, 09:53 AM
#19
I can't say for sure if the error starts over 60 mph or over 100 mph
h
h
Originally posted by SprintMax
FYI:
with 225/40
your speedo is .8 seconds fast every 1 mph
with 235/40
your speedo is .3 seconds slow every 1 mph
http://www.miata.net/garage/tirecalc.html
stock tire being 215/55 for the SE ..
but hey.. what do i know
FYI:
with 225/40
your speedo is .8 seconds fast every 1 mph
with 235/40
your speedo is .3 seconds slow every 1 mph
http://www.miata.net/garage/tirecalc.html
stock tire being 215/55 for the SE ..
but hey.. what do i know
09-20-2001, 09:57 AM
#20
Originally posted by SprintMax
thats your problem.. your speedo is way off.. and i notice that your tires look too big..
thats your problem.. your speedo is way off.. and i notice that your tires look too big..
09-20-2001, 10:01 AM
#22
my son.. its not something you will notice driving.. the only way you can tell is by a radar gun (ie. The cop tells you that you are doing a speed differnt from what your speedo indicates) its not really a big deal right now.. i would just advise you to get the correct size next time... and that is how you fix the speedo problem..
i noticed because i looked at how thick your tires were compared to mine.. the correct tire size or closest to it is 235/40-18
i noticed because i looked at how thick your tires were compared to mine.. the correct tire size or closest to it is 235/40-18
09-20-2001, 10:04 AM
#23
Senior Member
Thread Starter
Join Date: Mar 2001
Posts: 2,098
Originally posted by SprintMax
my son.. its not something you will notice driving.. the only way you can tell is by a radar gun (ie. The cop tells you that you are doing a speed differnt from what your speedo indicates) its not really a big deal right now.. i would just advise you to get the correct size next time... and that is how you fix the speedo problem..
i noticed because i looked at how thick your tires were compared to mine.. the correct tire size or closest to it is 235/40-18
my son.. its not something you will notice driving.. the only way you can tell is by a radar gun (ie. The cop tells you that you are doing a speed differnt from what your speedo indicates) its not really a big deal right now.. i would just advise you to get the correct size next time... and that is how you fix the speedo problem..
i noticed because i looked at how thick your tires were compared to mine.. the correct tire size or closest to it is 235/40-18
i thought the middle # was how thick they were!
aren't you running like a 2--/45/17
09-20-2001, 10:18 AM
#25
Senior Member
Thread Starter
Join Date: Mar 2001
Posts: 2,098
Originally posted by SprintMax
[B]
nope..i am running 235/40-18
when i said thick i meant the size of the tire wall...
[B]
nope..i am running 235/40-18
when i said thick i meant the size of the tire wall...
that's what i meant....the middle number=sidewall width...and the first # is the actual width of the tire itself....
225=how wide tire is
40=sidewall width
cuz a 19" rim uses a 35 series tire...which is more of a low profile tire than the 40 series
09-20-2001, 10:29 AM
#26
huh? what?
anyway.. 235/40-18 is the right size
anyway.. 235/40-18 is the right size
Originally posted by pawn
that's what i meant....the middle number=sidewall width...and the first # is the actual width of the tire itself....
225=how wide tire is
40=sidewall width
cuz a 19" rim uses a 35 series tire...which is more of a low profile tire than the 40 series
that's what i meant....the middle number=sidewall width...and the first # is the actual width of the tire itself....
225=how wide tire is
40=sidewall width
cuz a 19" rim uses a 35 series tire...which is more of a low profile tire than the 40 series
09-20-2001, 10:35 AM
#28
If he's running tires too small for the Max, why would his tires look thicker than yours? He has 225/40/18, you have 235/40/18. Your tires are bigger than his, so why do you say his look thicker?
Originally posted by SprintMax
my son.. its not something you will notice driving.. the only way you can tell is by a radar gun (ie. The cop tells you that you are doing a speed differnt from what your speedo indicates) its not really a big deal right now.. i would just advise you to get the correct size next time... and that is how you fix the speedo problem..
i noticed because i looked at how thick your tires were compared to mine.. the correct tire size or closest to it is 235/40-18
my son.. its not something you will notice driving.. the only way you can tell is by a radar gun (ie. The cop tells you that you are doing a speed differnt from what your speedo indicates) its not really a big deal right now.. i would just advise you to get the correct size next time... and that is how you fix the speedo problem..
i noticed because i looked at how thick your tires were compared to mine.. the correct tire size or closest to it is 235/40-18
09-20-2001, 12:26 PM
#33
anyway, I'm glad I did lots of reasearch before choosing my tire size
This is a great link I remembered using when I first bought the tires:
http://www.geocities.com/jgadlage/tirecalc.html
This is a great link I remembered using when I first bought the tires:
http://www.geocities.com/jgadlage/tirecalc.html
09-20-2001, 12:54 PM
#35
Re: I don't think .8mph to 1 sec makes a diff...
Originally posted by BRIGBOY
....I am running 225/40/18's and my speedo is as close as its gonna get. Radar tested, officer approved.
....I am running 225/40/18's and my speedo is as close as its gonna get. Radar tested, officer approved.
if its over .8 over 100 mph.. it won't matter too much because most people don't drive that fast.. but then.. it would be 108 mph when indicated doing 100 mph and so on...
09-20-2001, 01:04 PM
#36
Re: Re: I don't think .8mph to 1 sec makes a diff...
Sprint, his tires are smaller than yours so how could his speedo be reading low and yours isn't? You are running 235/40/18 tires which are bigger than the 225/40/18 tires he's running. His speedo would read high, not low. Your speedo will read low.
Originally posted by SprintMax
well if its .8 over 60 mph.. if you are doing 70 mph .. thats 10 * .8 so thats 78 mph you are actually doing when your car says you are doing 70 mph..
if its over .8 over 100 mph.. it won't matter too much because most people don't drive that fast.. but then.. it would be 108 mph when indicated doing 100 mph and so on...
well if its .8 over 60 mph.. if you are doing 70 mph .. thats 10 * .8 so thats 78 mph you are actually doing when your car says you are doing 70 mph..
if its over .8 over 100 mph.. it won't matter too much because most people don't drive that fast.. but then.. it would be 108 mph when indicated doing 100 mph and so on...
09-20-2001, 01:08 PM
#37
Re: Re: Re: I don't think .8mph to 1 sec makes a diff...
Originally posted by Shadow
Sprint, his tires are smaller than yours so how could his speedo be reading low and yours isn't? You are running 235/40/18 tires which are bigger than the 225/40/18 tires he's running. His speedo would read high, not low. Your speedo will read low.
Sprint, his tires are smaller than yours so how could his speedo be reading low and yours isn't? You are running 235/40/18 tires which are bigger than the 225/40/18 tires he's running. His speedo would read high, not low. Your speedo will read low.
yeah i know..
mine is .3 secs slow.. his is .8 secs fast..
according to the miata calculator
09-20-2001, 03:49 PM
#38
Guys, the second number is not a constant measurement, it's an aspect ratio. Check out this page on tirerack for a full explination.
http://www.tirerack.com/tires/tiretech/size.htm
A 235/45 tire is going to have more sidewall than a 215/45 tire.....
http://www.tirerack.com/tires/tiretech/size.htm
A 235/45 tire is going to have more sidewall than a 215/45 tire.....
09-20-2001, 05:40 PM
#40
Senior Member
Join Date: Mar 2001
Posts: 3,373
If I remember when Paul had the rims on his car (I saw them in person), those rims are 8.5" wide. That is why his tires look huge. A guy at the same meet, had the same size tire on a 18"x7.5" (or even a 18"x7") and Paul's tires (now pawn's) looked fatter. Honestly, I think the tire size shoudl be 235/40/18 for your car. I think Paul's car had the 15" SE rims before hand and that's why he might have went to 225/40.