smudge 1020 Report post Posted May 18, 2015 8" isn't the offset The numbers for wheels are as follows: 17"/18" = diameter of the wheel 7"/8" or sometimes 7J/8J = width of the wheel Offset is then a number in double figures, usually between 30 and 50 for our cars, which will give you how much the wheel will stick out when botled onto the hub A useful comparison guide can be found here: http://www.1010tires.com/Tools/Wheel-Offset-Calculator I'm on 18" x 9.5J wheels, offset ET40 The wider the wheel, the more it sticks out obviously, so you want a HIGHER ET to counteract this as the higher the offset number, the more the wheel sits inside the arch However, you also have to think about inside the arch to make sure the inside of the rim doesn't catch the suspension So, I'd 1st of all find a set of wheels that you like, find the size you want (usually 17" or 18") and then you can look at widths and offsets to make it sit nicely 1 remal reacted to this Share this post Link to post Share on other sites
Lauren 2259 Report post Posted May 18, 2015 If it's any help I would look for less offset to fill the arches better and consider an 8" rim which can take the stock tyre with a tiny bit of stretch (as I do) or run 225/45/17s. Mine have an offset of 38 which gives me an extra 20mm track and looks better too. So I have 17x8 with an offset of 38. If you have a 7" rim you don't really want to go wider than the stock sizes. TRD etc use a 7.5" wide rim with 225/40/18's, but honestly 8" is preferable for this tyre width. 1 remal reacted to this Share this post Link to post Share on other sites
smudge 1020 Report post Posted May 18, 2015 It all depends what you want from the wheels Purely aesthetics? Do you want more rubber on the tarmac? Do you want to really push the limits of the size you can fit? Do you want lightweight? 1 Ade reacted to this Share this post Link to post Share on other sites
remal 85 Report post Posted May 19, 2015 Sorry Smuge I may have written my post incorrectly. I meant to say we are looking at 17" or 18" with wither 7j width or 8j width. I just want to make sure the offset ET is correct for both size I'm only looking for looks not getting the widest tyre. IE if i went for 17" by 7J i can use ET 38 and the same for 18" by 8J width. Just wanted to make sure both would be correct before buying Share this post Link to post Share on other sites
rob275 1817 Report post Posted May 19, 2015 For 7j an offset of 25 front and 18 rear is the maximum you can have, if lowered 30mm, reduce the offset 2mm For an 8j an offset of 38 front and 31 rear is the maximum you can have, if lowered 30mm, reduce the offset 2mm The above is for a flush setup, this info is taken from the ft86 forum in the states, probably a good read http://www.ft86club.com/forums/showthread.php?t=7535 That said, you can have less offset, there are links to images of peoples setups on that page as well and how they look. 1 remal reacted to this Share this post Link to post Share on other sites
Omer86 40 Report post Posted June 3, 2015 Guys and gals, how does 17x7.5 with an et of 35 effect the driving of the car? understeering was mentioned but does get in the way of day to day driving? and how can the camber adjustment change this back for the same feel of the car? Share this post Link to post Share on other sites
Lauren 2259 Report post Posted June 3, 2015 If you're setup is square it won't mean anymore understeer. Minor changes in offset are not really going to be a factor. More camber on the front to a point will help turn in and likewise on the rear. But you need new suspension as well then. Toe is also a factor, so it's a number of things, with Toe and Camber being the ones that affect it the most. 1 Omer86 reacted to this Share this post Link to post Share on other sites
Omer86 40 Report post Posted June 3, 2015 Would square mean you have the same offset all round? So going from stock et48 to et35 wont make too much difference to the driving conditions? The more i learn about this, the more i learn i need to learn... Sent from my iPhone using Tapatalk Share this post Link to post Share on other sites
rob275 1817 Report post Posted June 3, 2015 Square = 4 identical wheels pretty much. As they will have the same offset, size and width 1 Omer86 reacted to this Share this post Link to post Share on other sites
Omer86 40 Report post Posted June 3, 2015 thanks Lauren and Rob, i may come back with more once I've had some sleep! Share this post Link to post Share on other sites
rob275 1817 Report post Posted June 3, 2015 It's 7am, you should have just woken up? Share this post Link to post Share on other sites
DaveJenks95 3 Report post Posted June 15, 2016 Looking to buy some JR11 wheels for my gt86 size: 18inch x 9.5 et30. anyone had any experience/issues with fitment etc with this setup? Share this post Link to post Share on other sites
KevinA 695 Report post Posted June 15, 2016 Et 30 will push out of the arches a bit., so potential bodywork rubbing. Share this post Link to post Share on other sites
Tom B 44 Report post Posted June 15, 2016 22 minutes ago, DaveJenks95 said: Looking to buy some JR11 wheels for my gt86 size: 18inch x 9.5 et30. anyone had any experience/issues with fitment etc with this setup? There's a set that size up for sale on here. Could try asking the owner about fitment? Share this post Link to post Share on other sites
S18 RSG 429 Report post Posted June 15, 2016 I'm running 18x8.5 ET30, with 225/40 tyres, and I'd be hard pushed to go much wider on the front without the tread being outside the arches (and therefore illegal). On the rear I could potentially go out another 5-10mm (so up to ET20) before reaching the outer limit of legality, but at that point I'd probably be catching kerbs a lot more often. On an 18x9.5 I assume you'll have to run quite a bit of stretch on the front to stay legal, which may mean running different tyre sizes front and back, which can cause the car to understeer more. You're on the limit I would say. Share this post Link to post Share on other sites
smudge 1020 Report post Posted June 15, 2016 1 hour ago, DaveJenks95 said: Looking to buy some JR11 wheels for my gt86 size: 18inch x 9.5 et30. anyone had any experience/issues with fitment etc with this setup? I had that fitment Dave, it was very agressive and needed 235/40 tyres to fit under the arches properly. But my car is fairly low so depending how low yours is you might be able to get a slightly wider tyre on there Share this post Link to post Share on other sites
smudge 1020 Report post Posted June 15, 2016 49 minutes ago, S18 RSG said: I'm running 18x8.5 ET30, with 225/40 tyres, and I'd be hard pushed to go much wider on the front without the tread being outside the arches (and therefore illegal). On the rear I could potentially go out another 5-10mm (so up to ET20) before reaching the outer limit of legality, but at that point I'd probably be catching kerbs a lot more often. On an 18x9.5 I assume you'll have to run quite a bit of stretch on the front to stay legal, which may mean running different tyre sizes front and back, which can cause the car to understeer more. You're on the limit I would say. Nope, I had 235/40 all round Share this post Link to post Share on other sites
S18 RSG 429 Report post Posted June 15, 2016 2 minutes ago, smudge said: Nope, I had 235/40 all round 235 on a 9.5 is quite a big stretch, as I mentioned. Share this post Link to post Share on other sites
smudge 1020 Report post Posted June 15, 2016 3 minutes ago, S18 RSG said: 235 on a 9.5 is quite a big stretch, as I mentioned. It's really not that big a stretch. I probably could have had 245 or even 255 if I wasn't so low Share this post Link to post Share on other sites
