just wondering if 18x8.5" rims will fit the 98 TF? Also wondering wot size tyres i will need for 18x8.5 or 18x8 rims? I am hopeless w/this stuff.

Cheers,
Cam.

Will fit as long as offset is correct; should be around +40 or so. 235/40/R18 is the tyre you need.

i've got 8.5" and my tyres are 235/35

Will fit as long as offset is correct; should be around +40 or so. 235/40/R18 is the tyre you need.

They should fit but if your worried check with your insurance company, mine wouldn't let me go wider than 7".

the correct offset being 4 x 114.3?

the correct offset being 4 x 114.3?

that will be the PCD, and the correct one will be 5x114.3, not sure about the offset but generally FWD cars require 40 or so.

how can you tell the offset of a mag

Its usually stamped or cast on the inside of the rim.

thanks for all your help fellas. If there is anything else i should know before buying, feel free to post :D

thanks for all your help fellas. If there is anything else i should know before buying, feel free to post :DWell considering your old tyres were 205/60/15? (Am i correct?) on your new tyres, your vehicle will be showing 100km/h on the dash and will only be travelling 96km/h in fact. Which is sort of a good thing as it is a speed precaution. teK-- suggested 235/40 so that when you are travelling 100km/h your real speed would only be 99.6km/h which is more accurate. But it doesn't really matter that much.

Just in case you want to know, here's a site to determine how fast your vehicle is travelling:
http://www.miata.net/garage/tirecalc.html

Well considering your old tyres were 205/60/15? (Am i correct?)
No, the stock tyre profile on a 3rd Gen for 15" rims is 205/65/15. Close, but no cigar.

No, the stock tyre profile on a 3rd Gen for 15" rims is 205/65/15. Close, but no cigar.
Yeh that was a typo, sorry. Though the figures I stated in my post were correct though because I used the Tyre Size 205/65/15 in the Tire Size Calculator.