22+ V4 chassis geometry

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andyb said:
cowboy dancing GIF
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How do you like the change to the 24 degree head bushings?
 
From a special contact, its save from the V4S 22 and later manual. If the forks are set to 249mm (as on my 24 V4S from factory), the fork leg extention (including caps) is 10.5 mm. I'll try out 14mm, lets see, how noticeable the impact is.
 
jogy said:
From a special contact, its save from the V4S 22 and later manual. If the forks are set to 249mm (as on my 24 V4S from factory), the fork leg extention (including caps) is 10.5 mm. I'll try out 14mm, lets see, how noticeable the impact is.
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I was thinking of trying the same. That should get you to around 24.1° rake to get to that 99-100 mm trail figure depending on tire/tire pressure
 
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Since I hadn’t measured the distance talked about here, I checked my forks today at 257mm from top of lower triple to top of fork cap. Thats equal to 5mm gold showing above triple and the fork cap adds another 5mm, so 10mm total above triple clamp. Handles much better (to me) as I said earlier. Of course thats only “spirited” backroads riding, not 190mph with knee-down track stuff. YMMV
 
Dropping forks 4 mm made a significant difference in the handling. Equates to 24° rake and 99 mm trail. So much easier to get it to my knee. No need for excessive bar input or counter steering. Bike still has good stability and drives well out of the corners. Ran easy 1m48s consistently on low power mode.

Now just wish it would stop puking its guts out. Looks like I have the dreaded .... water pump. Garbage.

IMG_1790.jpeg
 
SuperDomestique said:
Dropping forks 4 mm made a significant difference in the handling. Equates to 24° rake and 99 mm trail. So much easier to get it to my knee. No need for excessive bar input or counter steering. Bike still has good stability and drives well out of the corners. Ran easy 1m48s consistently on low power mode.

Now just wish it would stop puking its guts out. Looks like I have the dreaded .... water pump. Garbage.

View attachment 56756
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How many mm total are you at now, show over the top of the triples?
 
SuperDomestique said:
Dropping forks 4 mm made a significant difference in the handling. Equates to 24° rake and 99 mm trail. So much easier to get it to my knee. No need for excessive bar input or counter steering. Bike still has good stability and drives well out of the corners. Ran easy 1m48s consistently on low power mode.
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I think if you keep saying it it must be correct…. What does motospec say?
 
SuperDomestique said:
Dropping forks 4 mm made a significant difference in the handling. Equates to 24° rake and 99 mm trail. So much easier to get it to my knee. No need for excessive bar input or counter steering. Bike still has good stability and drives well out of the corners. Ran easy 1m48s consistently on low power mode.

Now just wish it would stop puking its guts out. Looks like I have the dreaded .... water pump. Garbage.

View attachment 56756
Click to expand...

is your rear shock at 312mm?
if you were not on lo power your front end would be shaking you dizzy on hard acceleration, why do you use lo power on a super bike?
is that all the fork travel you use?
 
These knobs waving their Motospec software. So weird that they play coy with it. Ultimately the reason they don’t say is they don't they know how to interpret the data. These muppets also don’t have my tire circumferences, sag, gearing, wheelbase, SA pivot height, SA length, etc so I’m not sure how they’re generating numbers. I ran the numbers through a rudimentary geo calculator and verified them as best I could by measuring. Maybe with their particular setup they’re unable to achieve these numbers but I pretty confident I’m good.

Either way I don’t care. All I can say is that it felt better and had more confidence in the front. I didn’t feel like I was battling to get the bike into the corners and once it was on lean it felt planted. I was able to drag a knee through the corkscrew Also had good drive out corners. Unfortunate that it started boiling coolant.
 
KarlKani said:
wow man you are on edge... I was attempting to talk to you about your setup like I always did before you decided to hate me
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Not on edge. Annoyed with the coolant boiling… and wasting a trackday. And Andy’s antics.

Stock shock length. Low power was to try avoiding the coolant boiling. That was the travel after the last session where I added some brake support. Previous session used all but 5 mm travel. First session was on medium power and had a little shakiness on acceleration but that could’ve been from adding too much Grip (run Dynamic DES). Added some Stability on acceleration along w low power and front was planted. Laguna Seca doesn’t need full power to go fast. Lap timer said I was doing 135 mph over T1 on both Medium and Low power modes.
 
If you are at 14mm of anodized tube above the top clamp, are you at 252mm from the top of the triple clamp? So 18-19 spec?

For reference, the of the top clamp is 238mm from the top of the triple (lower) clamp on my bike (2021).
 
Spec as in measurement given in the manual. I know that shows to the top of the fork cap, but it also depicts Showa forks.

I thought roadracerx advised someone with a 2021 to set the forks so 10mm of anodized tube above the top clamp. If you’re doing 14mm to the top of the cap, that’s probably similar.
 
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