20x8.5 wheel

will a 20x8.5 wheel with 5.4in. backspacing tuck on the rear?

im assuming it would tuck it the front, but will it be too wide to where ill have really bad turning probs

no problem www.bigwheelsrus.com

5.4 backspace on a 8.5 inch wide wheel is only +17 offset, not only would it not tuck on the back there is no chance it will even tuck on the front. You'd need a minimum of +45 on a 8.5 inch wide wheel to tuck the front, and that is counting on the camber. A +45 would not tuck on the rear, a +17 will have a good inch outside the wheel lip.

And in case you were wondering how I got the +17,

An 8.5 inch wide wheel is actually 9.5 inches lip to lip. measured backspace of 5.4 means the front spacing is 4.1 inches, offset is measure from the wheel centerline, so subtract 4.1 from half the wheel width of 4.75 and you get .65, there are ~26 mm in one inch so 26 x .65 = ~17mm, its positive offset (frontspace is smaller than back space) so its +17.

But I could tell right away, because you need 5.25" backspace to tuck a 7 inch wide wheel. The wider the wheel, the more backspace you need, because front spaceing has to stay the same. 8 (remember a 7 inch wide wheel is 8 inches wide) - 5.25 = 2.75 frontspace. To have 2.75 frontspace on an 8.5 inch wheel, you'd need 9.5 - 2.75 is 6.75 inches of backspace. Sorry.

Edited: 10/4/2005 9:17:47 AM by aftershock

k coo thks russ. i knew how all that worked, i jsut wanted a quick answer and i didnt really know the exact frontspacing needed to tuck, i thought it was close though, but i didnt know it was really 9.5 inches wide lol

ok, so the back will stick out about an inch, that will be no prob cause im going to run a courier/sundowner rear end, so now the front is the problem...i can make shorter tube arms, but do u think it'll have some major probs turning just bagged..since it is a 8.5inch wide wheel, well 9.5inch

turning with a 20 I think is less a problem of the wheel width (hold your fingers apart 1.5 inches, thats how much wider it will be than a 7 inch wide wheel, see, not that much really) and more of a problem of clearing the tires with the fenders. If you use the smallest 20 is still the size of the stock 15's, and those are big. So I predict your problems as lift and firewall clearance, not really wheel width.

20's on a daily mazda would frustrate me, I think mine may eventually run 19's as the biggest, even though I lay completely out on stock tires (so 20's would theoretically FIT)

alright, i need drop spindles for the truck to lay on the stock tires. i was just concerned with turning more because i think i have well enough lift to clear 20s, when i put my stock tires back on, i can go about 3inches give or take above the tire at around 120psi give or take. didnt think about having to tub the firewall though

i wasn't going to use the 20s everyday, just on occassions heh

Not to hijack this thread, but what is the smallest overall height 20? Isn't it like a 225/30R20? Anyone know what the exact overall height is?

a 225/30/20 is 25.3 inches tall, a 205/75/14 (stock size) is 26.1. Or roughly 30 inches taller than you getting dragged by Nics boat, just for some perspective.

go to this site to check tire heights.

You forgot to mention the part where I was doing backflips and 180s and jumping over other boats and shit.

Your a machine Russel, you are my idol, will you have sex with me?

So is a 225/30R20 the smallest 20 made? And Russ what is the tire size of my 18s since you are the "self proclaimed Mazda guru?"