new rims to come do see any problems ??

[ramairgrandamgt]

i have preety much decide on rims called LIMITED 538 part number > LYQ53888048 ,in chrome. they are 18 x 8 , 5 x 115, +40 mm offset , 73.1 hub centerbore . seen on www.playerwirewheel.com.

in these measurements ,i am trying to figure out also will they sit out a bit more closer to the edge of the fenderwells ? which i would probably like .

then what size tire is better ? 225x40x18 or 235x40x18. keep in mind the car will be lowered ruffly with 1.7 intrax system someday.

i have been told in has about a 1.5 inch flat deep dish lip. the more the better i would prefer of course .

i believe i have seen these just a few times on gagt's of 1999 to 2004. or there exact duplicate armano dunamis brand name or vision 539 same but only in 18 x 7.5 i believe ..

do you folks forsee any problems with fit etc etc ??

[freekLED]

Sounds good. Closest to stock diameter is 225/235x40x18 so no issues with the speedo if you use them. 235's will give you more sidewall and help prevent damaging the rim as well asa slightly softer ride quality (might not notice it at all)

Just watch the rear strut clearance with that +40 offset, you may need a spacer in the rear since with my +45 offset I had 1mm clearance to the strut before I added 6mm SS spacers.

Centerbore is OK but you may need hubcentric rings so they aren't loose on the hubs.

Yes they will be out closer to the outer fenderwell edge but just slightly inside the well.

[ramairgrandamgt]

so you think i might need both hubcentric rings and spacers or will one of the 2 work so i do not need both ? factory offset for gt wheels is +42 right. and i will be going with +40 and you had +45 and you needed spacers.

i would think were the +40 puts the wheel out closer to fenderwell that i would be even less likely to rub then i would even with the factory +42. or is it because i am going with 8 inch wide the reason i might need those hubcentric rings and spacers and may rub .

[Colin]

The GA's Hub diameter is 70.3 .

[ramairgrandamgt]

i did know that the hub center bore is different versus the aftermarket rims. so colin can you elaborate please .

[freekLED]

Originally posted by ramairgrandamgt
so you think i might need both hubcentric rings and spacers or will one of the 2 work so i do not need both ? factory offset for gt wheels is +42 right. and i will be going with +40 and you had +45 and you needed spacers.

i would think were the +40 puts the wheel out closer to fenderwell that i would be even less likely to rub then i would even with the factory +42. or is it because i am going with 8 inch wide the reason i might need those hubcentric rings and spacers and may rub .

You will need hubcentric rings for all 4 wheels to eliminate any movement of the rim in relation to the hub.

Yes factory offset is +42, but your wheels will be larger in both diameter and width therefore creating the need for more offset to compensate for the wider wheel, specifically to clear the rear strut. This is where the need for a spacer becomes a factor.

Your tires sidewall will be smaller in height leaving less slope/angle in depending on the width of the tire in relation to the wheel width. To compensate for this some European tuners put smaller width tires on a wide wheel (this also helps keeps the wheel within the fenderwell, outside is a big no-no here).

Hard to describe what I mean so here is a rough diagram (think of it as a cutaway view of the tire):

Stock looks (roughly) like this: |_____| (pretty square)

"Euro method" (roughly): \____/ (more angled)

Note the difference in angle of the sidewalls, this will help clear the rear struts. Front is not an issue as far as I know.

All that said I hope this helps. There are also various sites out there that have all the factors you need to consider.

I say go for it, spacers are readily available in different thicknesses should you need some more clearance.

Will

[ramairgrandamgt]

cool thanks will that was great help. understood everything . with you guys knowing exactly what measurements etc the new wheels will be and what you guys know about the gagt suspension setup etc.

could you determine what size hub centric rings i will need / and size of spacers i would need? i know it was mentioned somewhere on this site . but are there good or bad spacers and hubcentric rings ? and would my local huge tire place likely have those items in stock ?

just want to make sure my tire places as what they need to do the job right. and not have to wait for items to be ordered in .

[DontPassTheFence]

225/40 is the MINIMUM tire size you want to go with on an 8'' wheel without having the tire stretched as freekLED has said. 25 is optimum, and will not rub at stock height, and may rub just the tiniest bit when lowered. that being said, a dozen or more members on this sight run 8'' wide wheels on the newer GAs and have very little problem with suspension interference.

Hub centric rings are a good idea as well since any rimthat is lug centric (centered with only the lugs) may vibrate or cause a harshness in driving at higher speeds (its usually not noticable at lower speeds)

I do not recall the stock tire size for GAGTs from 99+ right now, so I can not do a simple tire calculation for you, BUT

if you visit miata.net/garage/tirecalc.html they have a nifty tire size calculator there that works quite well

[freekLED]

Matt - when you say "25" I assume this is a typo and you mean something like 235 or 245 for the width, not 25 sidewall height ?

Todd - like Matt said visit miata.net to calculate size. Best to have the place you are buying them calculate & order the proper hubcentric rings. Spacers: you might need them and you might not, order without, test fit 1 rear wheel and then if you need them buy them in the correct thickness and you are set.

[DontPassTheFence]

yea that ypoe was my bad, supposed to be 225, haha.

Also, If you are still in doubt, make some measurements with a simple ruler, measure clearance to suspension components, fenderwells, plastic liners, etc.

[BledRedGaSe]

225 is Ur tire width and has nothing to do with Ur side wall. The "40" in the 225-40-R18 is Ur side wall height. Just to clear that up.