Mountain Yak - 2021 Leadfoot 402a

[High_Country]

Great tire fitment post, @Yeti.

I hate to ask this question - what does the nomenclature "ET##" mean in your posts, e.g., ET20, ET28-34, etc? I can't figure it out...

Any commentary on the ride quality of that kit yet?

 

[Yeti]

Great tire fitment post, @Yeti.

I hate to ask this question - what does the nomenclature "ET##" mean in your posts, e.g., ET20, ET28-34, etc? I can't figure it out...

Any commentary on the ride quality of that kit yet?

I won't get the eiback kit for several weeks. They have released the kit but don't think they have built it yet.

So ET 20 is the offset from the centerline of the wheel in millimeters as a positive or negative number. ie. ET0 is the centerline, ET-10 pushes the wheel 10 mm outward from the centerline and ET 34 (our stock wheels) brings the wheel inward 34 mm from the centerline of the wheel.

A lot of people prefer to use backspace instead or addition to offset. Backspace is usually in inches and is the measurement from the inboard flange to the mounting surface of the wheel. This really is easy mode for suspension companies since this value is absolute (although not very accurate) it is accurate enough for suspension engineering.

I prefer to use ET values and do the calcs. i.e. (9 inch wheel with ET 0 )/2= backspace of 4.5" same wheel with an ET +13 is basically a 5 inch backspace.

Why is this important? the further out you push your wheels, the larger the radius swing (arc) that happens when you turn your steering wheel. The further out the wheel is, the less steering wheel input it takes to touch either side of on enclosure.

 

[High_Country]

I won't get the eiback kit for several weeks. They have released the kit but don't think they have built it yet.

So ET 20 is the offset from the centerline of the wheel in millimeters as a positive or negative number. ie. ET0 is the centerline, ET-10 pushes the wheel 10 mm outward from the centerline and ET 34 (our stock wheels) brings the wheel inward 34 mm from the centerline of the wheel.

A lot of people prefer to use backspace instead or addition to offset. Backspace is usually in inches and is the measurement from the inboard flange to the mounting surface of the wheel. This really is easy mode for suspension companies since this value is absolute (although not very accurate) it is accurate enough for suspension engineering.

I prefer to use ET values and do the calcs. i.e. (9 inch wheel with ET 0 )/2= backspace of 4.5" same wheel with an ET +13 is basically a 5 inch backspace.

Why is this important? the further out you push your wheels, the larger the radius swing (arc) that happens when you turn your steering wheel. The further out the wheel is, the less steering wheel input it takes to touch either side of on enclosure.

Ahhh...gothca. I'm very familiar with backspace and offset (and the differences) I just hadn't heard the term "ET". But, I haven't bought aftermarket wheels in a LONG time.

 

[Yeti]

Ahhh...gothca. I'm very familiar with backspace and offset (and the differences) I just hadn't heard the term "ET". But, I haven't bought aftermarket wheels in a LONG time.

OK, sorry. It's basically a shortened version of the German word Einpresstiefe "Insertion Depth".

 

[Bannerman]

OK, sorry. It's basically a shortened version of the German word Einpresstiefe "Insertion Depth".

That's what she said.

 

[Yeti]

Eibachs should be in, next week. If the weather cooperates, I should have them on as early as next weekend. I'll start with a 1" reduction (from 3") and check droop and compression values and will be updating Eiback support with what I find.

 

[Cheif2Slo]

And is as well!

 

[Yeti]

So these Eibachs are the same from the 2020 F150. They haven't worked a new set for 21s yet

 

[High_Country]

So these Eibachs are the same from the 2020 F150. They haven't worked a new set for 21s yet

The ones you just got in?

 

[Yeti]

The ones you just got in?

I'll get them in, next week but yes.

 

[High_Country]

Thoughts on if you should’ve expected a unique design for the 21+ or Tremor trim versus a ‘20 F-150?
I’m thinking spring rate considerations would be about the same (similar weights, application/use case, etc). Not sure if geometry due to tremor-specific knuckles should’ve led to a different design though.
You’re the smart one here - thoughts? Did this platform deserve a unique application?

 

[Yeti]

Thoughts on if you should’ve expected a unique design for the 21+ or Tremor trim versus a ‘20 F-150?
I’m thinking spring rate considerations would be about the same (similar weights, application/use case, etc). Not sure if geometry due to tremor-specific knuckles should’ve led to a different design though.
You’re the smart one here - thoughts? Did this platform deserve a unique application?

My first thought is I'm far from the smart one here.

I think they needed to release a product they thought would work and their 3" will be a 2 3/8" or more for the normal 2021s and about a 2" or less for us.

Overall, a 1.5" will work for my off season of off road and it'll give me something to do while I wait for the fox or icon stuff that's more tremor compatible. I'm leaning towards the dsc since the eibach are digressive and it'll let me switch it up a bit

 

[Yeti]

Summary of stuffs
Eibach pro 2.0 will be in tomorrow and should be fitted, this weekend.
Spoke with Fox (again) they did confirm release of new products for the 2021 F150 and even a Tremor Specific line. That is obviously all based on what's been hinted at and could change with input from engineering.
SCA fender flares are the best looking non-pocket and appear to be a perfect fit for us. But... to get them, you'll need to buy an SCA Black Widow. Those would be some expensive flares.
Still waiting on tires to show up so that'll be a while, yet.

 

[Cheif2Slo]

I’ve been toying around the idea of throwing on a set of 6112’s I have laying around but I didn’t really like the ride of them last time. Hence their location on my shelf. Come on fox and Bilstiein, get the lead out!

 

[Yeti]

I’ve been toying around the idea of throwing on a set of 6112’s I have laying around but I didn’t really like the ride of them last time. Hence their location on my shelf. Come on fox and Bilstiein, get the lead out!

What didn't you like about the 6112s?

 

[Cheif2Slo]

They felt harsh to me. Of course it could have been the 2” motofab spacer I put on top of them . Thought process was to not preload the springs for a smoother ride but I think I ended up with about 3” of lift and crap angles. The truck, a ‘16 platty ecoboost, rode like a dump truck. I ended up putting the stockers back on with a 1.5” motofab and was really happy with the ride. Soooo…. Yea, it was probably my fault and now I think I may give them an honest chance..

 

[Yeti]

They felt harsh to me. Of course it could have been the 2” motofab spacer I put on top of them . Thought process was to not preload the springs for a smoother ride but I think I ended up with about 3” of lift and crap angles. The truck, a ‘16 platty ecoboost, rode like a dump truck. I ended up putting the stockers back on with a 1.5” motofab and was really happy with the ride. Soooo…. Yea, it was probably my fault and now I think I may give them an honest chance..

Put them on at 2" and adjust from full droop?

 

[Yeti]

Eibachs are in. I ordered one G002 35x12.5 123q to check fitment. Holding this spot for measurements. Apparently, I was 8 beers into a 2 beer job, last time.

 

[Bannerman]

@Yeti any progress on finding a winch mounting bracket? I use my winch for intended and unintended purposes all the time, would hate to give it up.....

 

[Yeti]

Sent another message to swarfworks, today. I mentioned we had 4 people ready to buy and others interested. hopefully that wasn't a stretch..