FXDF trees on a FXDB
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Cruiser
Joined: May 2018
Posts: 236
Likes: 14
From: AZ
FatBob trees - Black 48609-09
FatBob axle- 41547-07
as you know because all of our conversations in your other post which already covered all of this, thats my bike you used a picture of. I dug back through my emails from about 8 years ago for you to get these part numbers which I used and have on my bike in that pic. As discussed you will also need axle spacers, a rotor spacer and fender spacers which I machined myself so dont have part numbers for but they are readily available. Hope this puts your mind at rest.
FatBob axle- 41547-07
as you know because all of our conversations in your other post which already covered all of this, thats my bike you used a picture of. I dug back through my emails from about 8 years ago for you to get these part numbers which I used and have on my bike in that pic. As discussed you will also need axle spacers, a rotor spacer and fender spacers which I machined myself so dont have part numbers for but they are readily available. Hope this puts your mind at rest.
I kept reaching out because I thought maybe the spacer sizes might change if used fxdf trees with fxdb oem hubs and sliders. I don't know anything about these conversions other than what I read and I have been told. I have noticed the spacer sizes change per the particulars of the application. I was hoping to get lucky and find someone who used the fxdb hub and sliders with fxdb trees.
Last edited by Valleyofthegun; Jun 1, 2018 at 11:20 PM.
Thread Starter
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Cruiser
Joined: May 2018
Posts: 236
Likes: 14
From: AZ
By caliper spacer I actually meant both hub and caliper. I should have specified. I read where a few people said that you should split the difference, but like much to do with harly's ask two people and get 3 answers.
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Cruiser
Joined: May 2018
Posts: 236
Likes: 14
From: AZ
great looking bike by the way!
Extreme HDF Member
Joined: Jun 2014
Posts: 11,448
Likes: 2,299
From: NW Ohio
Tree choice has nothing to do with wheel diameter. The only physical difference between them is the rake.
Adjust ride height for different tire diameters by altering fork tube length or insertion into the trees.
Adjust ride height for different tire diameters by altering fork tube length or insertion into the trees.
Road Warrior
Joined: Jun 2017
Posts: 1,705
Likes: 1,017
From: Lawrenceville Ga.
With more rake the front will sit lower, basic geometry
Extreme HDF Member
Joined: Jun 2014
Posts: 11,448
Likes: 2,299
From: NW Ohio
Yes, but if more rake, the same ride height and tire are desired, longer forks (or less insertion) get you there.
The relationships we're discussing here are fairly complex. Neck rake, tree rake, offset, fork length, tire diameter all come into play if you're trying to get to a specific handling goal. I understand the geometry, up to and including trail, but not all the handling implications. For instance, two bikes with equal trail but different rake...how do they handle differently, if at all? Of course, that's well beyond the scope of this topic.
The relationships we're discussing here are fairly complex. Neck rake, tree rake, offset, fork length, tire diameter all come into play if you're trying to get to a specific handling goal. I understand the geometry, up to and including trail, but not all the handling implications. For instance, two bikes with equal trail but different rake...how do they handle differently, if at all? Of course, that's well beyond the scope of this topic.
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Thread Starter
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Cruiser
Joined: May 2018
Posts: 236
Likes: 14
From: AZ
You have been straight forward with your info and I am totally clear on the route you took.
Grand HDF Member
Joined: Mar 2010
Posts: 3,949
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From: South of Mordor
yes tat2u, you did and it was greatly appreciated. I have also been intouch with a fairly well known custom bike builder that does these conversions for a living and he insists that I use fat bob trees instead of FXDWG. I want to use 17 rear and 21 front with fxdb hubs and sliders and I thought exactly what you and the poster before you said, that i should use fxdwg trees because fxdwg comes stock a with 21 up front but the custom builder says I shouldn't. He is addiment that I go with fat bob trees and lower the bike 2".
I kept reaching out because I thought maybe the spacer sizes might change if used fxdf trees with fxdb oem hubs and sliders. I don't know anything about these conversions other than what I read and I have been told. I have noticed the spacer sizes change per the particulars of the application. I was hoping to get lucky and find someone who used the fxdb hub and sliders with fxdb trees.
I kept reaching out because I thought maybe the spacer sizes might change if used fxdf trees with fxdb oem hubs and sliders. I don't know anything about these conversions other than what I read and I have been told. I have noticed the spacer sizes change per the particulars of the application. I was hoping to get lucky and find someone who used the fxdb hub and sliders with fxdb trees.
You can run the 21 up front with either tree, the spacing requirements would be the same.