Just as a side note, i could not use the bell shaped axle spacers that came with my PM wheel; the spacers were too tall to fit within the recessed area of the lower legs as they are conical and taper down as they reach the leg tip. I used the HD chrome spacers. I could have had the small end of the bell shaped ones machined to work but it seemed like overkill.

 

After all I was going to do, this is my chosen route too. I want to fit these to a 2007 Fatboy, with some Typhoon wheels. The fork will help me fit the front wheel, and hopefully (my pocketbook will answer this as no one else can!!), some new hardware/bearings/axle fitted to the 2007 swingarm will help me fit the rear (god I hope the brake rotor/belt pulley offsets for 2008 are the same as 2007, and that it is just upgraded harware/axle size that is definitely new). How do you guys think that a 21 skinny will look inside a stock fatboy front fender? My measurements say that my stock fender WILL bolt up to that, the wheel will work (my chosen one),and my existing brake caliper will work........, the fender will sit 1/2 inch higher than now (good considering a 21 is taller than the 140/70/17), and the inside diameter is identical (fender width) to mine. The triple trees HAVE to have some more rake in them though. The rear wheels/swingarm/shocks/frame/tire size is identical from Fatboy to Standard/Custom in 2007, and that fork measurement is 2 3/4 inch longer than mine!!! You need 2" fork length for every 4 degrees rake off of the stock 32 degree headset so.................I think perception is killing us somewhere, because to make these numbers work, there would HAVE to be a rake difference between a Fatboy tree and a Custom/Standard/Train tree. Ill BET the rake is ALOT more noticeable (if at all with these small differences) at the BOTTOM tree!!

 

Heres another one........... I know that there is a difference in Dyan steering rakes, and they cant just have a different frame for the wideglide to rake it out, gotta be the trees. They use this fork on the CVO Dyna, and if memory serves me correctly its like the wideglide so there must be some small degree of rake in those trees to compensate for that tall 21 rim!!! Anyone got a pic of fatboy fender on a skinny 21??????????

 

Hey JS...I have read many places that while the Fatboy and FXST share a frame, the Fatboy rake is 30 degrees and the FXST (and Train) are 32 degrees..gotta be happening in the trees. It is likely difficult to see at the neck but over the length of the forks it would be noticable.

For the front tire, I personally think the skinny will look consumed by the Fatboy front fender. I am going 21" in the front too but plan on using 21 x 3.5 rim with a 120 tire. Did this on my Deuce and it looked awesome. I used a 5.5" fender on the deuce which is only 1/2" narrower than the 6" wide fattboy fender so it will look much better. I may try this myself as my front fender is a Wernimont with custom paint on it, little different than the stock fender but the same width.. I would like to salvage it sure to the $$$ I have invested into it. If you would like to see a pic of the 21 X 3.5 wheel on my deuce, send me your email and I'll fire it to you...won't be a fatboy fender obviously BUT you will see how the wheel looks.

Looking on the HD site, they do not list the Dyna as compatible with the inverted forks so they may not be the same.

I am admittedly missing your point regarding the 2007 and 2008 compatibility in the rear, please explain, what are you up to there? I would just get all my wheels, spacers, etc. for an 07' FXST and be done.

 

The Typhoon applications for Softails are for 2008s only. I have read the changes to the rear, new 25mm bearings that are thinner, and a new 25mm axle (there is almost no difference to a 1 inch axle, Ill bet a cheaper overseas source!!), so the thinner bearings will need a different spacer in between, etc. I have read that the FL forks actually reduce the rake the same as youve stated, and 2 degrees seems the norm. I also have read about an additional 2 degrees of rake in SOME softail standard/customs, with no actual evidence, that is also said to be in the 2 degree range. I was going to source a custom fork from the expert on the website, but my budget limits this, I need wheels and a front tire too! So I chose the fork, and typhoons because of price. I would LOVE to have a wider front rim, the budget will NOT allow that. HDs list on the Softail chrome Typhoons as 550 per wheel, a relative bargain. So I am stuck with either a 19 or 21 inch stock width harley front wheel, and the stock fender for now no matter what. I also am trying to decipher through the Harley aftermarket 52 and the "aftermarket" 58 that has forklegs by Marzzochi?? No real hard info out there as to whether they have the same nice cartridge internals or not.........

 

One thing I have not checked is if the trees moved the tubes forward (increasing wheelbase) wothout changing rake angle.
I also just went and took my time with a 45 degree straightedge and found the following:
using the straightedge against the frame neck, and remember it's only straight at the top and bottom, where the bearings are, and the base of the straightedge on the top of the lower tree, there is a 1/8" gap in between the straightedge and the lower bearing flute on the frame neck. I'm not an engineer so I'm not sure how to find the rake change. I also measured the distance between the trees at the front and rear and found that the distance is 6 15/16" in the rear and 6 7/8 in the front.
If the gap, or rake differential is 1/8" over 7" distance then......oh hell we need an engineer.....

 

Good Luck with the rear wheel, I really have no insight into this.

On the rake, the Fatboy does not reduce the rake, it extends straight from ther neck which has a natural 30 degree angle. The FXST adds 2 degrees rake plus the stock FXST forks are an inch or two longer than the Fatboy forks.

SEE CORRECTION TO THE ABOVE 2 POSTS BELOW!!!!

 

Hey JS, looks like HD changed the swingarm in 08'. I think you may have more fitment issues with the typhoons than just bearings. I wuold hang back and buy wheels for the 07' FXST when you have the means, I really think this is not going to work. Here is the link to the HD website for chrome swingarms, you will see the 08' is a different part number.

http://www.harley-davidson.com/gma/g...bmLocale=en_CA

 

got this from a 2007 FXST Test from Bikernet

DIMENSIONS
Length 95.0 in. (2413.0 mm)
Seat Height: 25.2 in. (640.1 mm)
Ground Clearance 6.0 in. (152.4 mm)
Rake (steering head) 32°
Fork Angle 33.5°
Trail 5.0 in. (127.0 mm)
Wheelbase 66.9 in. (1699.3 mm)
Tires (Dunlop ® Harley-Davidson Series):
Front - D402F MH90-21 54H
Rear - D401 200/55R17 78V
Fuel Capacity (includes 0.5-gallon reserve) 5.0 gal. (18.9 L) Reserve Fuel Capacity Carburetor: 0.5 gal. (1.9 L) (warning light at approx. ESPFI: No reserve due 1.0 gal. for ESPFI models) to fuel injection
Oil Capacity 3.5 qts. (3.3 L)
Weight:
Dry Weight 651 lbs. (296 kg)
Vehicle Weight in Running Order 682 lbs. (310 kg)
Gross Vehicle Weight Rating 1125 lbs. (511 kg)

The Fatboy rake stock is 32 degrees ( I googled this)

 

I created an album, here is my bike. Front end and wheels are next, then the money pit is done!

https://www.hdforums.com/forum/members/49497-markthecelt-albums-527-marty-s-fatboy.html