Cant find a tire to run on the 19s!!
#1
Registered User
Thread Starter
iTrader: (1)
Join Date: Aug 2002
Location: Burlington, NC
Posts: 1,076
Likes: 0
Received 0 Likes
on
0 Posts
Cant find a tire to run on the 19s!!
Well since 275s are too wide on an 8" rim I cant do that. I also want to keep the rev/min similar and I cant seem to do that with any other comparable size.
There is no 265's.
255 40 19 has 246 rpms instead of 256 rpms (so thats off) plus its .3" taller then stock.
245 is way too small for the back.
What the heck am I supposed to do? Errrr.
There is no 265's.
255 40 19 has 246 rpms instead of 256 rpms (so thats off) plus its .3" taller then stock.
245 is way too small for the back.
What the heck am I supposed to do? Errrr.
#2
Re: Cant find a tire to run on the 19s!!
Originally posted by wadd3456
Well since 275s are too wide on an 8" rim I cant do that. I also want to keep the rev/min similar and I cant seem to do that with any other comparable size.
There is no 265's.
255 40 19 has 246 rpms instead of 256 rpms (so thats off) plus its .3" taller then stock.
245 is way too small for the back.
What the heck am I supposed to do? Errrr.
Well since 275s are too wide on an 8" rim I cant do that. I also want to keep the rev/min similar and I cant seem to do that with any other comparable size.
There is no 265's.
255 40 19 has 246 rpms instead of 256 rpms (so thats off) plus its .3" taller then stock.
245 is way too small for the back.
What the heck am I supposed to do? Errrr.
Last edited by jak; 01-11-2003 at 07:51 AM.
#5
Originally posted by wadd3456
I was told the potenzas done come in 255 35 19 ?
What tire are you running. Please respond asap because im ordering them tomorrow.
Thanks
I was told the potenzas done come in 255 35 19 ?
What tire are you running. Please respond asap because im ordering them tomorrow.
Thanks
Trending Topics
#8
Guest
Posts: n/a
Dude.. a difference of 10rpm is nothing... that's pretty accurate I'd say.
See, on your car, the Rear tire will wear out more than the front and at some point, the RPMs on the front and rear won't even match on the same set of tires. Because the overall diameter woulb be different due to uneven wear in the front and rear..
and it's prefectly normal! That's why we rotate tires too.~
See, on your car, the Rear tire will wear out more than the front and at some point, the RPMs on the front and rear won't even match on the same set of tires. Because the overall diameter woulb be different due to uneven wear in the front and rear..
and it's prefectly normal! That's why we rotate tires too.~
#10
Guest
Posts: n/a
no.. not the rim size.
For each car, there's a stock tire size, which is manufacturer's spec. Now the speedometer is calibrated according to the overall diameter of the stock tire.
For example, say a car came out with stock 17" and the sidewalls are 2".. so overall diameter is 21" (17 + 2 + 2). To keep the speedometer accurate when you upgrade to 18", all you need to do is keep the overall diameter same. For this example, the sidewall of the tire would have to decrease to 1.5" as the wheel size increases by 1"
Because overall diameter changes as tires wear out, it is almost guranteed that your speedo is not accurate, but within an acceptable and usuable range.
Usually performance tires come with 10/32" of treads. A tire is considered worn out if it reaches 2/32" or lower. So, if the speedometer was accurate with brand new tires on the wheel (10/32"), by the time the tires are worn(<2/32"), the overall diameter will decrease at least by 1/2" or .5" (10/32 - 2/32 = 8/32*2 = 16/32 = 1/2), and that's lot more that 10 rpm difference per mile with the same tire.
Here's a link with a Java applet where you can enter your stock tire size and then try out different other sizes to see how it changes everything. It's good.
http://www.miata.net/garage/tirecalc.html
If you have any questions about Wheel/Tire sizing like offsets and backspacing and all that.. let me know..
For each car, there's a stock tire size, which is manufacturer's spec. Now the speedometer is calibrated according to the overall diameter of the stock tire.
For example, say a car came out with stock 17" and the sidewalls are 2".. so overall diameter is 21" (17 + 2 + 2). To keep the speedometer accurate when you upgrade to 18", all you need to do is keep the overall diameter same. For this example, the sidewall of the tire would have to decrease to 1.5" as the wheel size increases by 1"
Because overall diameter changes as tires wear out, it is almost guranteed that your speedo is not accurate, but within an acceptable and usuable range.
Usually performance tires come with 10/32" of treads. A tire is considered worn out if it reaches 2/32" or lower. So, if the speedometer was accurate with brand new tires on the wheel (10/32"), by the time the tires are worn(<2/32"), the overall diameter will decrease at least by 1/2" or .5" (10/32 - 2/32 = 8/32*2 = 16/32 = 1/2), and that's lot more that 10 rpm difference per mile with the same tire.
Here's a link with a Java applet where you can enter your stock tire size and then try out different other sizes to see how it changes everything. It's good.
http://www.miata.net/garage/tirecalc.html
If you have any questions about Wheel/Tire sizing like offsets and backspacing and all that.. let me know..
#11
Registered User
Thread Starter
iTrader: (1)
Join Date: Aug 2002
Location: Burlington, NC
Posts: 1,076
Likes: 0
Received 0 Likes
on
0 Posts
Yeah i know /understand that , but my questoin is slightly different.
People are trying to match to the 18s. I have 17s.......matching to them would be different then matching the 18s. Do i want to be closer to 17s or 18s
People are trying to match to the 18s. I have 17s.......matching to them would be different then matching the 18s. Do i want to be closer to 17s or 18s
Thread
Thread Starter
Forum
Replies
Last Post
Workshop12
Exterior & Interior
256
03-23-2020 01:45 PM
350Z Project X
Suspension
9
10-10-2015 09:23 AM
FromGtoZ
Intake Exhaust
2
09-20-2015 03:41 PM