Post by
Exar-Kun »
https://forums.nicoclub.com/exar-kun-u1725.html
Sun Jul 04, 2004 6:29 am
*deep breath*I sup[pose its time for me to throw my take into this, here we go:
Backspacing is the distance from the innermost part of a wheel to the mounting plane. backspacing=offset + wheelwidth / 2
thusly, offset and backspacing are just two different ways of stating the same thing. Both refer to the mointing plane on the wheel, but reference it wither to the rear of the wheel(backspacing) or the centerline of the wheel(offset).
you hear nbackspacing on more 'murican car wheels(mustangs, camaro, etc) than imports, where the numbers are all in offset and mm usually.
as far as clearance, the thing you have to check for clearance, number one, is the inner lip of the wheel, right behind the spokes, if thats too close it will hit the "top" of the caliper, which is why you need certain 15" or usually 16" wheels to clear Z brakes(26mm can be cleared with some 15" wheels..30mm brakes require 16" or larger)...
after that, the lower the offset(and backspacing) the better you are for clearing larger brakes, usually. This is because the spokes will usually be 'spaced' out a bit from the mounting plane(the peice that presses against the brake rotor/hub assembly of the car) sometimes this is not the case though, and there is minimal spacing, and the inside of the spokes rub the caliper...but thats wheel specific problems and where this quote came from"you'll never know for sure until you test fit it"
now then, onto larger issues.
enzo was right about:"beginning of the thread, that +6 offset is too low, causes stress, and either way probably wont clear z brakes."
it was answered. but in the ensuing complications lets clear some things up.
"people need to quit *****ing about omfg hub stressi ran16x8.5 -10 and 16x9.5 -19 panasport c8-r wheels for 3 years no problems"thats great you managed to run an improper (i assume this is on a 240)offset wheel, making your hubs and suspension overwork because of the additional leverage you palced on them(not to mention weight), but lets not tell people to do it KNOWING it can cause problems.
"quit complaining about extrapolation of hub stress and shearing bolts...just make sure your lug nuts are good and tight and thats that.."
extrapolations? it's physics! you're incearsing the length of a arm on a lever, it makes MORE FORCE. I;ve said it many times, if people want to run things lkike this on their cars, I will inform them of the problems they'll face, and I am glad you ran that with no problems. tight lug nuts will not save your hubs or your studs.
next up! as chunki said, I havent seen problems running lower offsets than waht I consider "ideal" on Z chassis cars to ruin bearings or studs, or anything like I've seen on other cars...this may be due to the nice suspension, strong bearsings, I really dont care...but I dont see many problems with it...other than those discussed before(weight, tracking issues, leverage on the suspension arms/springs, etc, and causing the stress on the tire to be weighted almost exclusively on the inner edge) you can negates some of the additional stress by running a lighter wheel and tire assembly, but it wont solve the root problem.
on dori's point"Number uno, that is a very low offset. Will you have problems? Who knows. But don't think you aren't putting more stress on the hub/bearing than necessary. If you sheer off a stud or trash your wheel bearings, you'll know why."
he's completey correct, and like myself isnt saying you WILL encounter a problem, but merely informing you WHY something may happen, and that you're setting yourself up for it to happen. this is simmilar to me telling people not to run large heavy tire on a truck without beefier steering stabilizers..you may not ruin the stock one, but if you do..I warned you(told you why it would).
there's a lot of informed people on this board, with massively differeing opinions on what constititues what should or shouldnt be done to an S chassis(or other chassic car), and I thoroughly enjoy reading all the opinions, facts, etc brought up..
one thing I think we've all forgoten about the boards is TO HELP THE PERSON WHO POSTED THE QUESTION WITH THEIR APPLICATION PROBLEM, not debate what we think is the best looking/handing wheel package or whatever, or whether spacers will blow up a car...
Aslo, thee seems to be a serious lack of reading my "attention" sticky about questions...asking for advice without dropping in a "I want to do X with the car, have X budget" specific info will be seen as botha nnoying to me, and I may find myself inclided to start deleteing things.
if you read all that, I hope you've learned something(other than that I have poor spelling), and take my advice with a small grain of salt, since I still have a bunch to learn, but I'll do what I can.
ease up! have fun! I am on vacation for 4 days. play nice.-chet