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View Full Version : rime size and tire help???



jaydog82
03-11-2011, 02:09 AM
OK so i have a set of motegi 15" rims that i want to install on my st165 88 alltrac. they are 15x7 +40 and i plan on getting either some 205/55r15 nitto 450s or some falken 512s. what size wheel spacers do i need to use? and does anyone have any other tire recommendations?
http://i469.photobucket.com/albums/rr54/jaydog82celi/car%20sales/DSC06525.jpg

WALKER
03-11-2011, 09:16 PM
I started a thread with a link to a tire calculator

http://www.celicatech.com/forums/showthread.php?50983-Wheel-Tire-Size-Calculator

If I use that calculation and assume that the stock 4th gen tires/rims are same as 5th gen rims/tires (215/50R15x6.5, +39) and then input your new rims/tires (205/50R15x7, +40) it looks like you shouldn't need any spacers and you shouldn't encounter any rubbing or issues as it will leave more room that OEM. You speedo will be out by about -1.7%.

I would double check the stock rim sizes for the 4th gen though.

WALKER
03-11-2011, 09:16 PM
I started a thread with a link to a tire calculator

http://www.celicatech.com/forums/showthread.php?50983-Wheel-Tire-Size-Calculator

If I use that calculation and assume that the stock 4th gen tires/rims are same as 5th gen rims/tires (215/50R15x6.5, +39) and then input your new rims/tires (205/50R15x7, +40) it looks like you shouldn't need any spacers and you shouldn't encounter any rubbing or issues as it will leave more room that OEM. You speedo will be out by about -1.7%.

I would double check the stock rim sizes for the 4th gen though.

jaydog82
03-12-2011, 02:01 AM
looks like stock rim size foe my st165 88 alltrac is 14x6 -39, i want to go to 15x7 +40. any idea what size wheel spacer i will need?

WALKER
03-12-2011, 02:46 AM
So just did some research and the stock ST165 rim and tire size is 205/60R14x6, +39 (not negative).

Using those numbers it looks like the new combination 205/50R15x7, +40 will be the same for the suspension and fender clearance, however it will fill out the wheelwell by an extra 3mm. With that minimal difference I would think you should be able to bolt them on and go with no modifications required. You will definitely not want a spacer as that would push them out into the wheelwell even more. Your speedometer will read almost accurate as well with only a 0.8% difference.

jaydog82
03-12-2011, 04:06 AM
that makes more sense, it looked like - on the rim. old rim :)

KoreanJoey
03-12-2011, 06:44 AM
205/55? Really?

http://a2.sphotos.ak.fbcdn.net/hphotos-ak-ash4/189608_10150108136443801_533313800_6236446_6545217 _n.jpg

WALKER
03-12-2011, 08:21 AM
Sorry not quite sure your asking? Also, the tire picture you posted is a different size.

https://lh6.googleusercontent.com/_dVQEH6BdvXI/TXss27wj8QI/AAAAAAAACqo/lbJsQcr_IuM/Tire%20Size%20Comparison.jpg

https://lh6.googleusercontent.com/_dVQEH6BdvXI/TXss25TzjEI/AAAAAAAACqs/Q9ebx42SECU/s512/Tire%20Size%20Comparison%202.jpg

Murgatroy
04-16-2011, 01:21 AM
You won't need spacers, and 205/55 is fine. You could do 215/55 without issues either on a 7" wide wheel if that size is easier to find.

In short, what you are planning will be fine with no modifications at all.

A 7" wheel with a +40 offset is as close to perfect as you can get for a 4th Gen. I had a 7" wide wheel with a +38 offset and they set out just a hair on my 4th Gen.

jaydog82
10-11-2011, 03:24 AM
cool, thanks. would a 50 be better than a 55, for tire roll ect?

KoreanJoey
10-12-2011, 02:53 AM
Well the second number is just a ratio of the first. So a 205/55 and a 225/50 is probably a similar amount of sidewall. One thing though, you'll want to keep the tread width and the wheel width pretty similar to keep the sidewall as squared up as possible.

Galcobar
10-12-2011, 09:40 AM
205/50 has a sidewall of 102.5 mm (205 mm x 0.50). A 225/50 puts the sidewall at 112.5 mm, for a total diametre difference of 25 mm or a full inch. That will screw up your speedometer significantly -- on a 16" wheel it's more than 3% difference.

I might suggest reading through this tech section (http://www.1010tires.com/tech.asp), it's one of the most complete I've found.

jaydog82
10-12-2011, 02:05 PM
ya i understand what it all means, what i don't know is if a 205/55r15 tire will have too much tire role during cornering than a 205/50r15 tire. As for my speedo if i go with a 205/55r15 it will only be 0.8% faster verses a 205/50r15 which is 2.5% slower.

Galcobar
10-13-2011, 02:55 AM
Tire roll depends at least as much on the sidewall stiffness as it does the height of the sidewall. Load rating and speed rating both play into it.

KoreanJoey
10-13-2011, 05:57 AM
Speed rating, not so much, but load rating definitely. Generally the higher load rated tires will have a stiffer sidewall as well.

BUT, again, you want to stay square with the wheel otherwise you'll create a static load on the tire by either squeezing it in or stretching it out.

T-spoon
10-14-2011, 07:48 PM
All I can think of when I see this thread title is ice.

Carry on....

jaydog82
08-16-2012, 04:30 AM
ok, so its almost time to get new tires. im looking at either a yoka s-drive a nitto 455 or a dunlop dz101 all in a 205/55r15. what do you guys think of those tires? i wanted to get a 215/50r15 in a bf goodridge g-force, but i cant get them from my supplier.

KoreanJoey
08-16-2012, 05:22 AM
I only know what tires make good grip while sacrificing life. None of those listed are on my list so I'm not of much help. :(

METDeath
08-16-2012, 03:06 PM
ok, so its almost time to get new tires. im looking at either a yoka s-drive a nitto 455 or a dunlop dz101 all in a 205/55r15. what do you guys think of those tires? i wanted to get a 215/50r15 in a bf goodridge g-force, but i cant get them from my supplier.

DZ101, that's the tire just a step below star spec, right? I'm very happy with my Star Specs, I just don't daily them anymore to make them last even longer, plus slightly more comfy ride.

KoreanJoey
08-17-2012, 02:20 PM
It's definitely more than a step...

jaydog82
08-18-2012, 08:10 AM
So anyone know a good tire that will last for 20k miles and that stick in dry and wet conditions?

Sent from my MB525 using Tapatalk 2

underscore
08-18-2012, 08:36 AM
I love my Kuhmo SPT's, great wet & dry grip, lots of tread and my first two looked like they weren't wearing at all til I killed one by getting a fluke flat tire.