2015F150xlt

Hey Everyone,
New to the boards, long-time Ford owner. Just recently got a new F-150 and looking to do a lift with tires. Unfortunately, I've been doing a lot of searching, and the best resource I've found so far has been Dubsesd posts on his lifted platinum, which is awesome, but the wheel setup isn't exactly what I'm looking for.

I've seen many posts on leveling and lifting, but most builds I've read have the trucks keeping their stock rims, or keeping the tires tucked under the wheel wells.

I want to lift my truck and do the coilovers like Dubsesd did, or go with a 6" lift kit. I also want to go with a 35x12.5 tire and 18x9 wheel.

I'm sorry to say my math skills are horrible when it comes to backspacing and offset, but I'm trying to get a slightly aggressive look with the tires where they will extend pass the fender well by about an inch.

Could someone please recommend what kind of offset and/or backspace I should be looking at? I've looked online at other configurations of older Fords, and it seems that a -12mm offset would be good, but then backspacing comes into play. Also would be the age-old question... any rubbing issues to foresee?

Thanks for any help or you can give!

BoozeDaily

iTrader: (2)

I can't answer your question as to the exact offset you would need, but there are a ton of posts on here with guys showing off their trucks (rightly so) with wheels and tires, along with exact specifications on said wheels and tires - lifts too.

Most of the lifts are 2.5" levels and some are putting an extra inch or so on the rear block.

2015F150xlt

Yeah, unfortunately, a lot of what I've found has been with people keeping the stock rims, and a lot of the posts with aftermarket rims are sporting leveling kits. I think I've actually found more results from dealership ads that have actually done a 6" lift.

Appreciate the heads up though. I'll keep digging.

srg963

IMO

If you want the tires to poke, go with a negative offset.

If you want the tires to sit flush, go with a +20.

yugnat

I'm in the same situation researching the right offset vs lift. In what I've determined with the new '15 body style and a 9" wide wheel, don't go out more than 0 offset with a 2.5" lift. With a 6" lift 0 offset looks good and you can do -12 offset for a little more poke if you prefer that look.

Dubsesd has a 3" rear block and I believe settled at 2-3/4" for the front coilovers in the end although he started with a 2" spacer lift initially and had the Boss's at 3" when first installed (correct me if I'm wrong here somebody) so you'll see pics of all those stages. That being said once he had the 1.5" wheel spacers on, that stance equates to a 9" wheel with a +12 backspace. So anything between +12 to +20 will give a flush look with a 9" wide wheel (if you go with a different width then all the offsets I gave you need to change) and works well on level style lifts. Again, 0 offset with a 9" wide wheel starts to poke and a -12 will even more so. IMHO the higher the lift the more poke you need, and vice versa.

I wouldn't sweat calculating backspace as you can get your 'poke' amount figured out just using offset. Lastly, don't forget that the new '15s have the rear fender covering the wheels a little more than the front so it looks like the front stick out more - although the track width is the same front/rear. So when people tell you how much wheels/tires will poke you need to consider if they're giving you front or rear measurements (the difference is about 3/8").

JHG

I think Expressway Ford can answer your questions quite easily. He's been very helpful if you can reach him.

bgs133

I have posted this pic a few times. This is a 6" lift with a 20 x 9 wheel with 0 offset. 35x12.50 tire. Hope it gives you a starting point.

LilMac

I have 6" lift with 20x10 -12 and 35x12.5, minor trimming to the front plastics and still some slight rubbing on the front crash bars.. looking into pushing them out an inch with a hydraulic ram like some others have done, wouldn't need to move it out much. Overall i'm happy with the set up, the tires definitely stick out though. Pic has a filter because it was super dark and hard to see without it

Kenn213

Offset and backspace are basically two measurements that can tell you the same thing. Offset specifically measures the distance from the center of the wheel to the hub mounting surface. Backspace measures from the inside edge of the wheel to the hub mounting surface.

Most lift kits will give you a backspace (or offset) range that will fit with certain size tires. For example BDS gives this range for 35'' tires on 18s for their 6'' lift kit: 35" x 12.50" w/18 x 9 and 5 - 5.5" back spacing. Then you can just use math or an offset chart to figure out what offset range based on the wheel width and backspace. (Example: A 9'' wide wheel staying in the 5-5.5'' back space range would be 0 to +12 offset according to that chart)

My mods (305/55/20 tires on 20x9 +18 wheels) just barely fit without rubbing, however I did a wider/shorter tire than some members here choose to do with just a level.

Brettlongo

6" lift with 37x12.5