General > In General...
Forks
Motorrad:
--- Quote from: Motorrad on June 16, 2015, 05:25:15 PM ---Just thought of something. Since my fork diameter change... Assuming all else was the same... Change my tail numbers. Since in theory the axle has to be further away from fork center. Hmm. Drunken midnight bench racing.. I'll measure if that's a factor in the AM...
--- End quote ---
Yes. this changes things also.
center of fork for the blue legs I have is roughly 28mm
center of fork to the axle center of kx450 is roughly 33mm.
just right there I gained +5mm in offset.
crap.
no wonder its handling like it is.
anyone have a good trail calculator?
DoldGuy:
Just for testing purposes....trailing axle (-5mm) versus leading axle.
Motorrad:
--- Quote from: Motorrad on June 18, 2015, 10:23:37 AM ---
--- Quote from: Motorrad on June 16, 2015, 05:25:15 PM ---Just thought of something. Since my fork diameter change... Assuming all else was the same... Change my tail numbers. Since in theory the axle has to be further away from fork center. Hmm. Drunken midnight bench racing.. I'll measure if that's a factor in the AM...
--- End quote ---
Yes. this changes things also.
center of fork for the blue legs I have is roughly 28mm
center of fork to the axle center of kx450 is roughly 33mm.
just right there I gained +5mm in offset.
crap.
no wonder its handling like it is.
anyone have a good trail calculator?
--- End quote ---
RE-measured this. not as much differance as when I quickly eyeballed it durring lunch.
Motorrad:
https://www.rbracing-rsr.com/rakeandtrail.html
MY 1991 kx500
Trail: 4.57"
Head Angle: 27 Deg
Travel: 12.20"
Triple offest 22mm
Axle offset (work backwards) = 21.7mm
Total offset (working backwards)= 43.7mm
06 KX450
Trail 4.6" (probly same)
Head Angle 27 Deg
Travel: 12.4"
Triple Offset 24.5mm
Total offset to achieve trail (working backwards)= 43mm
Axle offset (working backwards) = 20.6mm
Other.
Dunlop 80/100= 27.72” (704.088mm)
Dunlop 90/100= 27.99” (710.946mm)
Motorrad:
so. based on all those numbers. both bikes came with same sized front tire from factory. same head angle, only differance is .8mm in trail. but the tripple clamp offset of the two goes the wrong way to achieve this. so the larger 450 forks would have to have less axle offset to make up for these changes. 20.6mm working backwards to be exact........
Hmm. Need to go measure this tonight to confirm.
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