Wheels - Backspace and Offset?
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Tuned
Joined: Nov 2014
Posts: 344
Likes: 7
Wheels - Backspace and Offset?
I need help understanding backspace and offset.
I am installing a DJM lowering kit on my 1969 F100. It will drop the front 3" and the rear 4".
Planning to buy new wheels and tires.
Do I need to worry about backspace and offset when buying new wheels?
What width wheels and tires will work well with my truck without any rubbing issues?
I am not leaning toward and certain size wheels or tires. I was just basically trying to eliminate (or at least reduce) the gap between the top of the tire and the fender well.
Any advice would be helpful.
Thanks!
I am installing a DJM lowering kit on my 1969 F100. It will drop the front 3" and the rear 4".
Planning to buy new wheels and tires.
Do I need to worry about backspace and offset when buying new wheels?
What width wheels and tires will work well with my truck without any rubbing issues?
I am not leaning toward and certain size wheels or tires. I was just basically trying to eliminate (or at least reduce) the gap between the top of the tire and the fender well.
Any advice would be helpful.
Thanks!
Lead Driver
Joined: Jul 2017
Posts: 9,545
Likes: 1,156
From: San Jose, CA
I'm sure you'll get a lot of help here Fleetwood. I'm pretty sure I've seen talk from quite a few members that have performed the DJM install.
Is there anything in their instructions about backspacing or offset requirements? They may not talk about tire size, leaving that up to the end-user to determine what fits on their particular truck and what they like the look of. But often there are physical limitations to just how much wheel can hang out behind the hub/wheel flange and things like king-pins, springs and spindles/knuckles and such.
Are you also wanting to know what the terms mean? Or do you have that down and are just asking about DJM specifics?
Paul
Is there anything in their instructions about backspacing or offset requirements? They may not talk about tire size, leaving that up to the end-user to determine what fits on their particular truck and what they like the look of. But often there are physical limitations to just how much wheel can hang out behind the hub/wheel flange and things like king-pins, springs and spindles/knuckles and such.
Are you also wanting to know what the terms mean? Or do you have that down and are just asking about DJM specifics?
Paul
Fleet Owner
Joined: Dec 2009
Posts: 20,678
Likes: 82
From: NorCal
I need help understanding backspace and offset.
I am installing a DJM lowering kit on my 1969 F100. It will drop the front 3" and the rear 4".
Planning to buy new wheels and tires.
Do I need to worry about backspace and offset when buying new wheels?
What width wheels and tires will work well with my truck without any rubbing issues?
I am not leaning toward and certain size wheels or tires. I was just basically trying to eliminate (or at least reduce) the gap between the top of the tire and the fender well.
I am installing a DJM lowering kit on my 1969 F100. It will drop the front 3" and the rear 4".
Planning to buy new wheels and tires.
Do I need to worry about backspace and offset when buying new wheels?
What width wheels and tires will work well with my truck without any rubbing issues?
I am not leaning toward and certain size wheels or tires. I was just basically trying to eliminate (or at least reduce) the gap between the top of the tire and the fender well.
As a rule of thumb, backspacing should be half the wheel width for these trucks...an 8-inch width in the rear commonplace. However, a 9-inch width would be perfect but there doesn't seem to be decent wheels with that width.
I suggest searching Bump articles online for different wheel/tire combos then work with a local retailer (or online company) to determine the required specifications.
.
Thread Starter
|
Tuned
Joined: Nov 2014
Posts: 344
Likes: 7
I'm sure you'll get a lot of help here Fleetwood. I'm pretty sure I've seen talk from quite a few members that have performed the DJM install.
Is there anything in their instructions about backspacing or offset requirements? They may not talk about tire size, leaving that up to the end-user to determine what fits on their particular truck and what they like the look of. But often there are physical limitations to just how much wheel can hang out behind the hub/wheel flange and things like king-pins, springs and spindles/knuckles and such.
Are you also wanting to know what the terms mean? Or do you have that down and are just asking about DJM specifics?
Paul
Is there anything in their instructions about backspacing or offset requirements? They may not talk about tire size, leaving that up to the end-user to determine what fits on their particular truck and what they like the look of. But often there are physical limitations to just how much wheel can hang out behind the hub/wheel flange and things like king-pins, springs and spindles/knuckles and such.
Are you also wanting to know what the terms mean? Or do you have that down and are just asking about DJM specifics?
Paul
I have not opened the boxes from DJM yet, but I doubt if they give and direction pertaining to what size wheels to use.
I understand the terms, I just need to know what size wheels and tires would work well on my truck, after the DJM drop. Or, will any tire/wheel combo that worked before it was lowered, still work after it is lowered?
Thread Starter
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Tuned
Joined: Nov 2014
Posts: 344
Likes: 7
I did an axle flip in back and DJM beams in front for a -3 and -5.25 drop, respectively. I used new steel wheels from Wheels Vintiques, Series 62... rears are 15x8 with 4-inch BS wearing 275/60-15s. Fronts are 15x7 with 3.5-inch BS and 225/70-15 tires. The truck sits level and no rubbing whatsoever. I should have gone with 235/60-15s in front for a lil rake. Whenever I carry a load, the rear is lower than the front by a hair.
As a rule of thumb, backspacing should be half the wheel width for these trucks...an 8-inch width in the rear commonplace. However, a 9-inch width would be perfect but there doesn't seem to be decent wheels with that width.
I suggest searching Bump articles online for different wheel/tire combos then work with a local retailer (or online company) to determine the required specifications.
.
As a rule of thumb, backspacing should be half the wheel width for these trucks...an 8-inch width in the rear commonplace. However, a 9-inch width would be perfect but there doesn't seem to be decent wheels with that width.
I suggest searching Bump articles online for different wheel/tire combos then work with a local retailer (or online company) to determine the required specifications.
.
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