18x9.5 +45 w/ a 275. It could fit a 285 but it's a bit bubble on a 9.5J wide rim. A 295 would require a 10.5 or 11 width at minimum, and there does not exist an offset that is optimized for both inner and outer rim clearance without requiring extensive fender and suspension modification.
We...
Diamond Silver x Pressed Graphite TE37SL - 18x9.5 +45 - No Rubbing Offset, works on stock height + lowering springs + coilovers! Run up to a 285 tire without fender work.
Both colors - now in-stock for our FL5 platforms!
Showing off our latest project we had the pleasure of helping build!
Boost Blue Civic Type R FL5 (11th Gen) on our Rays Volk #systemspec Exclusive TE37SL 18x9.5 +45 5x120, Gold, w/ 275/35/18 Michelin MP4S, stock suspension!
#GSW color themed - Built by Honda of Stevens Creek :)
More high-res...
Showing off our latest project we had the pleasure of helping build!
Boost Blue Civic Type R FL5 (11th Gen) on our Rays Volk #systemspec Exclusive TE37SL 18x9.5 +45 5x120, Gold, w/ 275/35/18 Michelin MP4S, stock suspension!
#GSW color themed - Built by Honda of Stevens Creek :)
More high-res...
Boost Blue Civic Type R FL5 (11th Gen) on our Rays Volk #systemspec Exclusive TE37SL 18x9.5 +45 5x120, Gold, w/ 275/35/18 Michelin MP4S, stock suspension!
#GSW color themed - Built by Honda of Stevens Creek :)
These tires run wide and fit like the predecessor Ad08R. You should be alright, but a 255 would afford more clearance on the outside edge especially when hitting a hard dip.
FL5 owner user Toshi23_TypeR / Shared by Scott - equipped with the all new RAYS Volk TE37 Saga S-Plus Time Attack in Black/Red Redot version, sporting 265/35/18 Michelin Cup 2 tires in 18x9.5 +46 (5mm spacer) making it effectively +41 offset! Spoon springs.
BBS RIA in 18x9.5 +50 in Diamond Black, w/ Yokohama 265/35/18 tires on stock height, equipped on user BigPeriodA's Sonic Gray Pearl 11th Gen Civic Type R!