Question about triple trees and 23" wheel
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Road Master
Joined: May 2013
Posts: 846
Likes: 8
From: Yuba City, California
Question about triple trees and 23" wheel
As some of you know after I get back stateside this January I am finishing up my Dyna bagger build with a 23" front wheel. Here's my question regarding the triple trees.Which trees should I go with, Fat Bob or Wide Glide trees adding 2* as well.
I currently have the Fat Bob trees which if look at the first picture you can see that the wheel looks close to the frame. In the second picture it looks further from the frame. I know putting on a 23" wheel with a 130/60-23 tire will put the center of the axle about 7/8" higher in return lifting the front of the bike. Would the 2* in the FXDWG trees bring this down some (I know not much) making my trail still in the safe zone? I'd like the wheel out a little bit from the frame as I will have a chin spoiler as well and don't want to risk damaging either the fender or the spoiler.
I currently have the Fat Bob trees which if look at the first picture you can see that the wheel looks close to the frame. In the second picture it looks further from the frame. I know putting on a 23" wheel with a 130/60-23 tire will put the center of the axle about 7/8" higher in return lifting the front of the bike. Would the 2* in the FXDWG trees bring this down some (I know not much) making my trail still in the safe zone? I'd like the wheel out a little bit from the frame as I will have a chin spoiler as well and don't want to risk damaging either the fender or the spoiler.
Grand HDF Member
Joined: Mar 2010
Posts: 3,949
Likes: 150
From: South of Mordor
If you can get the numbers required, this site should answer everything for you.
http://207.57.8.251/tools/rake_trail.html
To get the calculation of the tire diameter I took the mm width and multiplied it by the mm side wall percentage, divided that by 25.4 to get the number in inches, multiplied that number by two and added it to the rim diameter. Ex. 19-100/90 -> 100mm × .90 = 90mm / 25.4 = 3.6" × 2 =7.2" + 19" = 26.2" - 1" for bead.
Based on what I have read and via the link above, ideal trail is between 4"-6", so I highlighted everything that falls in this range below in green and everthing outside that range in red.
THESE NUMBERS ARE ESTIMATES
Stock stetup for a FXDB 19"
Front Tire Diameter = 19"-100/90=25.2"
Neck Rake = 29°
Triple Clamp Offset = 2"
Fork Length = 30"
Triple Tree Rake = 0°
Trail in Inches = 4.7"
FXDB with WG trees 19"
Front Tire Diameter = 19"-100/90=25.2"
Neck Rake = 29°
Triple Clamp Offset = 1.1"
Fork Length = 30", 32" or 34"
Triple Tree Rake = 3°
Trail in Inches = 3.9 " w/ 30" legs
Trail in Inches = 3.8" w/ 32" legs
Trail in Inches = 3.7" w/ 34" legs
FXDB with a 21"-120/70 (my setup)
Front Tire Diameter = 21"-120/70=26.6"
Neck Rake = 29°
Triple Clamp Offset = 2"
Fork Length = 30"
Triple Tree Rake = 0°
Trail in Inches = 5.1"
FXDB with a 21" w/ WG trees
Front Tire Diameter = 21"-120/70=26.6"
Neck Rake = 29°
Triple Clamp Offset = 1.1"
Fork Length = 30", 32" or 34"
Triple Tree Rake = 3°
Trail in Inches = 4.3 " w/ 30" legs (what I would have if I only changed the trees)
Trail in Inches = 4.2" w/ 32" legs
Trail in Inches = 4.1" w/ 34" legs
FXDB with a 23"
Front Tire Diameter = 23"-130/60=28.1"
Neck Rake = 29°
Triple Clamp Offset = 2"
Fork Length = 30"
Triple Tree Rake = 0°
Trail in Inches = 5.5"
FXDB with a 23" w/ WG trees
Front Tire Diameter = 23"-130/60=28.1"
Neck Rake = 29°
Triple Clamp Offset = 1.1"
Fork Length = 30", 32" or 34"
Triple Tree Rake = 3°
Trail in Inches = 4.7 " w/ 30" legs (perfect setup to keep trail at stock)
Trail in Inches = 4.6" w/ 32" legs
Trail in Inches = 4.5" w/ 34" legs
Stock setup on a Wide Glide (Rough Guess)
Front Tire Diameter = 21"-80/90=25.7"
Neck Rake = 34°
Triple Clamp Offset = 1.1"
Fork Length = 34"
Triple Tree Rake = 3°
Trail in Inches = 5.2" w/ 34" legs (21")
Trail in Inches = 6" w/ 34" legs (23" Mod)
Trail in Inches = 7" w/ 34" legs (23" and Fat Bob Trees)
Rough drawing of a stock Street Bob setup
http://207.57.8.251/tools/rake_trail.html
To get the calculation of the tire diameter I took the mm width and multiplied it by the mm side wall percentage, divided that by 25.4 to get the number in inches, multiplied that number by two and added it to the rim diameter. Ex. 19-100/90 -> 100mm × .90 = 90mm / 25.4 = 3.6" × 2 =7.2" + 19" = 26.2" - 1" for bead.
Based on what I have read and via the link above, ideal trail is between 4"-6", so I highlighted everything that falls in this range below in green and everthing outside that range in red.
THESE NUMBERS ARE ESTIMATES
Stock stetup for a FXDB 19"
Front Tire Diameter = 19"-100/90=25.2"
Neck Rake = 29°
Triple Clamp Offset = 2"
Fork Length = 30"
Triple Tree Rake = 0°
Trail in Inches = 4.7"
FXDB with WG trees 19"
Front Tire Diameter = 19"-100/90=25.2"
Neck Rake = 29°
Triple Clamp Offset = 1.1"
Fork Length = 30", 32" or 34"
Triple Tree Rake = 3°
Trail in Inches = 3.9 " w/ 30" legs
Trail in Inches = 3.8" w/ 32" legs
Trail in Inches = 3.7" w/ 34" legs
FXDB with a 21"-120/70 (my setup)
Front Tire Diameter = 21"-120/70=26.6"
Neck Rake = 29°
Triple Clamp Offset = 2"
Fork Length = 30"
Triple Tree Rake = 0°
Trail in Inches = 5.1"
FXDB with a 21" w/ WG trees
Front Tire Diameter = 21"-120/70=26.6"
Neck Rake = 29°
Triple Clamp Offset = 1.1"
Fork Length = 30", 32" or 34"
Triple Tree Rake = 3°
Trail in Inches = 4.3 " w/ 30" legs (what I would have if I only changed the trees)
Trail in Inches = 4.2" w/ 32" legs
Trail in Inches = 4.1" w/ 34" legs
FXDB with a 23"
Front Tire Diameter = 23"-130/60=28.1"
Neck Rake = 29°
Triple Clamp Offset = 2"
Fork Length = 30"
Triple Tree Rake = 0°
Trail in Inches = 5.5"
FXDB with a 23" w/ WG trees
Front Tire Diameter = 23"-130/60=28.1"
Neck Rake = 29°
Triple Clamp Offset = 1.1"
Fork Length = 30", 32" or 34"
Triple Tree Rake = 3°
Trail in Inches = 4.7 " w/ 30" legs (perfect setup to keep trail at stock)
Trail in Inches = 4.6" w/ 32" legs
Trail in Inches = 4.5" w/ 34" legs
Stock setup on a Wide Glide (Rough Guess)
Front Tire Diameter = 21"-80/90=25.7"
Neck Rake = 34°
Triple Clamp Offset = 1.1"
Fork Length = 34"
Triple Tree Rake = 3°
Trail in Inches = 5.2" w/ 34" legs (21")
Trail in Inches = 6" w/ 34" legs (23" Mod)
Trail in Inches = 7" w/ 34" legs (23" and Fat Bob Trees)
Rough drawing of a stock Street Bob setup
Last edited by blueangel73; Oct 18, 2014 at 11:15 AM. Reason: Did some more research, straightened out some numbers and added a drawing
Outstanding HDF Member
Joined: Aug 2012
Posts: 3,217
Likes: 90
From: Detroit
The bike in the second photo looks like it has a lot more rake. Maybe it's a Wideglide frame (which has more rake than the standard Dynas), maybe it has extra rake in the trees, or raked bearing cups or something like that.
Cruiser
Joined: Oct 2008
Posts: 218
Likes: 2
From: Austin,tx
numbers are on the page........ I have tried a 23 on 3 degree rake cup set with fatbob trees. Handled fine. The distance between fender and down tubes is not much. Have read on here of someone running no rake trees but also no front fender. If you plan on running a fender find some raked trees. Stock wideglide trees have the least or find set of aftermarket 3 degree trees. I went with a set of Accutronix 5 degree trees. With stock length fxd tubes it sits low, but not drag the frame low. Yeah it turns like sh#t but with the lengthened swingarm I run, it is going to turn like a boat anyway.
I don't care about quick turns so for me it works.
Depends how you ride and what you want. These numbers about trail are ok on paper.
My real world guess is to say find 3 degree trees run a fender, and ride it like you stole it.
filth
I don't care about quick turns so for me it works.
Depends how you ride and what you want. These numbers about trail are ok on paper.
My real world guess is to say find 3 degree trees run a fender, and ride it like you stole it.
filth
Thread Starter
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Road Master
Joined: May 2013
Posts: 846
Likes: 8
From: Yuba City, California
numbers are on the page........ I have tried a 23 on 3 degree rake cup set with fatbob trees. Handled fine. The distance between fender and down tubes is not much. Have read on here of someone running no rake trees but also no front fender. If you plan on running a fender find some raked trees. Stock wideglide trees have the least or find set of aftermarket 3 degree trees. I went with a set of Accutronix 5 degree trees. With stock length fxd tubes it sits low, but not drag the frame low. Yeah it turns like sh#t but with the lengthened swingarm I run, it is going to turn like a boat anyway.
I don't care about quick turns so for me it works.
Depends how you ride and what you want. These numbers about trail are ok on paper.
My real world guess is to say find 3 degree trees run a fender, and ride it like you stole it.
filth
I don't care about quick turns so for me it works.
Depends how you ride and what you want. These numbers about trail are ok on paper.
My real world guess is to say find 3 degree trees run a fender, and ride it like you stole it.
filth
Grand HDF Member
Joined: Mar 2010
Posts: 3,949
Likes: 150
From: South of Mordor
That is nice looking, but I am not a fan of the long stretch on bikes, guess thats why I didn't deviate tofar from the "Bob" part of my ride. I think the Wide Glide trees will kick it out enought to give you your clearences but not take away to much from the "Bob" look.
Hey filth, have you seen the front wheel since I picked it up from ya? This is the 21"x3.25" with a 120/70 on it sitting under some Fat Bob trees.
numbers are on the page........ I have tried a 23 on 3 degree rake cup set with fatbob trees. Handled fine. The distance between fender and down tubes is not much. Have read on here of someone running no rake trees but also no front fender. If you plan on running a fender find some raked trees. Stock wideglide trees have the least or find set of aftermarket 3 degree trees. I went with a set of Accutronix 5 degree trees. With stock length fxd tubes it sits low, but not drag the frame low. Yeah it turns like sh#t but with the lengthened swingarm I run, it is going to turn like a boat anyway.
I don't care about quick turns so for me it works.
Depends how you ride and what you want. These numbers about trail are ok on paper.
My real world guess is to say find 3 degree trees run a fender, and ride it like you stole it.
filth
I don't care about quick turns so for me it works.
Depends how you ride and what you want. These numbers about trail are ok on paper.
My real world guess is to say find 3 degree trees run a fender, and ride it like you stole it.
filth
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Thread Starter
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Road Master
Joined: May 2013
Posts: 846
Likes: 8
From: Yuba City, California
The diameter of the Avon 130/60-23 I'll be using is actually 29.3. And aren't the WG trees 2*, not 3*? So not sure how much difference it would make with this setup:
FXDB with a 23" w/ WG trees
Front Tire Diameter = 23"-130/60=28.1"
Neck Rake = 29°
Triple Clamp Offset = 1.1"
Fork Length = 30", 32" or 34"
Triple Tree Rake = 3°
Trail in Inches = 4.7 " w/ 30" legs (perfect setup to keep trail at stock)
Trail in Inches = 4.6" w/ 32" legs
Trail in Inches = 4.5" w/ 34" legs
FXDB with a 23" w/ WG trees
Front Tire Diameter = 23"-130/60=28.1"
Neck Rake = 29°
Triple Clamp Offset = 1.1"
Fork Length = 30", 32" or 34"
Triple Tree Rake = 3°
Trail in Inches = 4.7 " w/ 30" legs (perfect setup to keep trail at stock)
Trail in Inches = 4.6" w/ 32" legs
Trail in Inches = 4.5" w/ 34" legs
Grand HDF Member
Joined: Mar 2010
Posts: 3,949
Likes: 150
From: South of Mordor
The diameter of the Avon 130/60-23 I'll be using is actually 29.3. And aren't the WG trees 2*, not 3*? So not sure how much difference it would make with this setup: FXDB with a 23" w/ WG trees Front Tire Diameter = 23"-130/60=28.1" Neck Rake = 29° Triple Clamp Offset = 1.1" Fork Length = 30", 32" or 34" Triple Tree Rake = 3° Trail in Inches = 4.7 " w/ 30" legs (perfect setup to keep trail at stock) Trail in Inches = 4.6" w/ 32" legs Trail in Inches = 4.5" w/ 34" legs
29.3", 29 degree neck, 1.1" offset.
3 degree trees
w/30" legs trail is 5.1"
w/34" legs trail is 4.8"
2 degree trees
w/30" legs trail is 5.7"
w/34" legs trail is 5.5"
If they are in fact 3 degree tree then either the 30" or 34" legs will put you closest to stock trail on the bike.
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