FN01R-C FAQ

[youngmanvr4]

I've been doing alot of research on two sizes for FN01R-Cs, and I'm still not sure if I've got everything totally figured out. But here is some wheel/tire fitments that I think I have some what right. *Note* all for 4 lug s13's and for KTS coil-overs. Different coil-overs have different sizes, so keep in mind.

17x8 +35 215/45/17, Will clear front and rear coil-overs, no fender roll or pull needed. Will be sunken without spacers.

17x8 +35 225/45/17, Will clear front and rear coil-overs, might need fender roll, no pull. Will be sunken without spacers.

17x8 +35 235/45/17, Should clear front coil-overs with a 8mm spacer and rear should fit fine, rolled fenders for more clearance (may not be needed). Will be sunken with out spacers

17x9 +20 215/45/17, Will clear front and rear coil-overs, best to roll but may not be needed, no pull.

17x9 +20 225/45/17, Will clear front and rear coil-overs, will need fender roll, no pull.

17x9 +20 235/45/17, Will clear front and rear coil-overs, will need fender roll, no pull. Will stick out past fenders.

17x9 +20 245/40/17, Rear clear coil-overs but front still in question, spacer maybe needed, fender roll, pull needed?.

These are the size I think are right but I'm not totally for sure, I would love to have Chris and Chet go over them and see whats off. I am doing this also for my personal longing to know what sizes will clear forsure from a pro becuase I'm going to order some FN's with a week or 2 and really need to know what I can fit. I emailed bother Chris and Chet about the sizes but I figured it would be best to start a FAQ type thing.

Me personally, I would rather not pull becuase of looks, I dont like stretching tires much, rolling seems pretty easy to do, and wheels sticking out past the fenders I dont really like.

Help me out with the ones I already have and feel free to add more and I'll edit this post for further combos that people can run, like if you think you can clear whatever coil-over with this tire and may have to include a spacer will feel to share your knowledge. Nate

Modified by youngmanvr4 at 10:27 AM 2/9/2006
Modified by youngmanvr4 at 5:05 PM 2/10/2006

[Fenvy]

for the front or the rear?

I have 17x7 +35 and 17x9 +20 in the rear225 and 245

[youngmanvr4]

This is most less to run the same all around.

Did you have to pull the rears or only roll?

Pics are highly welcome.

[Fenvy]

for the rear, I only did roll, it's good

[youngmanvr4]

Added, thanks for the good info, have any pics?

My question is will 245/40 fit in front on 17x9 +20's? That and the 17x8 +35 235/45 I need help on. Chris help!!!

[Fenvy]

Added, thanks for the good info, have any pics?

My question is will 245/40 fit in front on 17x9 +20's? That and the 17x8 +35 235/45 I need help on. Chris help!!!

These photos will tell you what to expect in the REAR when mounted on a 1991 240sx with 2" drop at -1 camber (front is 17x7 with 225/45/17, 2.25" drop at -0.5 camber)

[youngmanvr4]

I see that your selling the other 2 17x9 +20's becuase it doesn't fit the fronts so that answers one of my question. So 17X9 +20 235/45 should fit in the front right?

I did a little figuring on paper today on the 17x9. I'll explain the differences from 17x8 +35 and 17x9 +20 for anyone who wants to know. This is for the wheel only...not including tire.

17x8 total wheel width is 203.2mm, the center of the wheel is 101.6mm (half of 203.2), then add +35mm offset is 136.6mm is where the front of hub mounting face is on the wheel.

17x9 total wheel width is 228.6, the center of the wheel 114.3mm, then add +20 offset is 134.3 where the front of hub mounting face is.

Now do some simple math and thats a 2.3mm difference, so the 2.3mm difference is 2.3mm difference on the inside (strut side/coil-over) on the wheel. The difference from x8 to x9 is only 2.3mm on the inside, but the difference from x8 to x9 on the outside (Fender side) is major. With x8 you will be sunken 1 inch further then x9 (duh). So its safe to say that 17x9 +20 over 17x8 +35 is mostly for looks/flushness. Other then gaining 2.3mm on the inside, which can mean the difference from rubbing and not rubbing the coil-over. But the problem with adding a extra inch you lose a inch of clearance on the outside. So its 2.3mm on inside clearance or 1 inch of outside clearance. Now if I'm getting any of this wrong please correct me, this is just simple math and not "real" fitment.

So to the best of my understanding, if you want a flush or over flush wheel and maybe more clearance issues then the 17x9 +20 is for you, but if you want a little sunken wheel with inner clearance issues then the 17x8 +35 is for you. The one thing nicer about 17x8 is you can always add spacers to make it more flush. I would rather have a meatier tire and have to run a spacer then to have it to wide (sticking out past the fender) narrower tire without a option of running a spacer without making it worse. Is this right?

Now please dont think I'm trying to say 17x9 +20 is bad, its just all taste. x9 is great for staggered but for the ones of us that want the same size all around x9 its as good from the research I've done.

My plans are now to run a 17x8 +35 with 235/45/17s all around with rolled fenders all around. I may not need the rolled fenders but why not right. Then I'll see if I'm not happy with the flushness and if needed for front tire clearance I'll add spacers.
Modified by youngmanvr4 at 4:41 PM 2/9/2006

[Fenvy]

it can be made to fit in the front but I don't want pull the fender. I think it looks crappy

[youngmanvr4]

I'm with ya on that one.

[chmercer]

selling decent sized wheels for pizza cutters because you think pulled front fenders looks "crappy"?

ricers

[youngmanvr4]

Well in my case even if I pulled the fronts I wouldn't gain any performance from having a 9 becuase I will not stretch the tires enough to gain any performance from it. I dont need the traction up front either.

So unless it will clear better which it wont in my case why should I waste my time on something that isn't going to benefit me? Pointless in my opinion.

[chmercer]

also about the guide, keep in mind that different brands of coilovers have different backspace clearances.

[youngmanvr4]

also about the guide, keep in mind that different brands of coilovers have different backspace clearances.

100% Correct, most of the wheel/tire sizes were for KTS coil-overs.