Long story story short, I went to have new NT-01's mounted and discovered one of my wheels is cracked (FN01r-C). The size on these is 18x9.5 +22. I'm having a hard time finding a replacement in the same color and size.

My question is regarding the offset. I'm posting this here because it's related to track use. Will a more aggressive offset put more stress on the hubs and will it change the handling? I know 18x9.5 +12 will fit with the camber settings I have, -3F and -2R but don't want to go that route if not reccomended. I can get a full set of FN01R-C's with +12 offset for about $850 shipped and the same price for +22. Just not sure which offset would be a better option. The car handles perfect right now, but if it can handle even better why not change

Thanks for any input.

 

Stick with +22 , you don't want to limit your future tire selectionn buy running such an aggresive wheel. Also for the track you should try to keep your offset as close to 30 as possible.

 

Yes. If you put a 50 pound weight (wheel plus tire) on the hub, the farther you move the weight away from the hub the more stress on the hub. What is the relationship between stress and an additional 10 mm ? I don't know.

Yes the car will handle differently. You have widened rear tracking but left front tracking alone.

 

Thank you both. I'll stick with the +22 then.

davidv, I would've swapped all 4 corners so both front and rear would've had wider tracking.

 

This scares me, I posted a thread recently HERE for wheel selection at track and was suggested to buy +18 and I bought Enkei RPF1's 17x9.5 +18. I use my car mostly for track and all the street miles I put are the ones that I put on when driving to the event.

I still haven't received my wheels yet, should I return them?
I know the stockers have a +30 offset on Nismo

Fyi, you too have replied in this thread

 

Why? Track width is one of the easily modified factors of lateral load transfer. Why would you take that mod out of any suspension adjustment?

 

Its to keep your steering geometry correct. when you push the wheels out the tires start to scrub while cornering.


I run +27 up front and +17 in the rear for track. Having the slightly wider rear will cause a little push, but its easy tuned out with suspension.

 

Crap! The wheel size/offset has been discontinued.

Off to find new wheels now.

NT03+M in 18x9.5 +27
RPF1 18x9.5 +15
FN01R-C 18x9.5 +22 same model I have but diff offset. I like these

Any suggestions on that size under 1k.
I remember a member here had discounts on Enkei wheels.
Thanks!

 

the 'ideal' offset changes if you lower your car... depending on suspension geometry, a lowered car will have the same scrub radius with a lower offset wheel as a higher riding car will have with a higher offset wheel...

how much depends on the suspension setup. but it should be noted that if a racing god tells you that 30mm offset is ideal, that 30mm is only perfectly accurate if you have the same ride height. otherwise, you need t find out his scrub radius and then get an offset that will allow you to have the same scrub radius.

of course, you guys have 350z's and since they are pretty low stock, you could probably jut ignore it... how mucb lower could it be?

scrub radius is only for the steered wheels, of course. after you deal with what offset is best for the fronts, make your choice for the rear based on front vs. rear track width.

NT03+Ms and RPF1s are sick wheels too. I plan on getting some of those in 17x9.5+38 for my 240sx

 

I can understand scrub concerns if you're running in a spec class (Spec Miata, RX7, SRF, etc.) where every little mph is important but I think for the 350Z being able to adjust LLT front to rear has some advantages.

 

You can get a new set of FN01R-Cs in 17x10 +25 for less than that, and allow 275/40s at all four corners. I like the 17s because tires are way cheaper. Of course there are some very good deals out there on used wheels.

 

Scott,

I have a 4 wheel 14" StopTech kit and I don't think the 17" wheel clears. Could I test fit one of your FN01R-C's?

 

Other option:

Rota http://www.wheeldude.com/catalog/pro...oducts_id=5956

21lbs

 

You sure could, but I don't think it'll fit as they just clear my 332mm kit.

 

The only thing I'd be worried about in messing with track width is that by adjusting spacing off the hub (as opposed to moving the actual suspension attachment points), you also mess with scrub radius.

But I don't think 5-15mm or so is enough to put undue strain on the hub bearings, so I agree that it's something worth looking into at the least.

And I haven't heard any complaints about scrub radius changes causing lots of undue understeer in that range of offset difference from stock either.

*edit*: should have read further. Other guys covered it.

 

Thanks for the info, Scott. I'll pass on the fitting

Thanks to other posters to for the additional info. Looks like I'll stick with a set of wheels with offset in the 18-22mm range.

 

Well, contrary to what I posted above I went ahead and purchased a set of RPF1's with +15 offset. I'll try them out with the 275's up front and see if they fit properly with my setup. I have a weekend at the track coming up so I'll get to see if any rubbing occurs.

They only weight 18.6lbs, a big weight savings over the FN01R-C at 22+lbs

 

two other thoughts:

- it seems generally people running slicks/track only setups run a smaller diameter, which will increase your ability to run a lower offset.
- getting a rim with a higher offset could allow you to adjust the offset with spacers, to fine tune any fitment issues.

...

congrats on the purchase and be sure to follow up in this thread.